1 //===- ConstantRangeTest.cpp - ConstantRange tests ------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "llvm/IR/ConstantRange.h" 10 #include "llvm/ADT/BitVector.h" 11 #include "llvm/ADT/Sequence.h" 12 #include "llvm/ADT/SmallBitVector.h" 13 #include "llvm/IR/Instructions.h" 14 #include "llvm/IR/Operator.h" 15 #include "llvm/Support/KnownBits.h" 16 #include "gtest/gtest.h" 17 18 using namespace llvm; 19 20 namespace { 21 22 class ConstantRangeTest : public ::testing::Test { 23 protected: 24 static ConstantRange Full; 25 static ConstantRange Empty; 26 static ConstantRange One; 27 static ConstantRange Some; 28 static ConstantRange Wrap; 29 }; 30 31 template<typename Fn> 32 static void EnumerateConstantRanges(unsigned Bits, Fn TestFn) { 33 unsigned Max = 1 << Bits; 34 for (unsigned Lo = 0; Lo < Max; Lo++) { 35 for (unsigned Hi = 0; Hi < Max; Hi++) { 36 // Enforce ConstantRange invariant. 37 if (Lo == Hi && Lo != 0 && Lo != Max - 1) 38 continue; 39 40 ConstantRange CR(APInt(Bits, Lo), APInt(Bits, Hi)); 41 TestFn(CR); 42 } 43 } 44 } 45 46 template<typename Fn> 47 static void EnumerateTwoConstantRanges(unsigned Bits, Fn TestFn) { 48 EnumerateConstantRanges(Bits, [&](const ConstantRange &CR1) { 49 EnumerateConstantRanges(Bits, [&](const ConstantRange &CR2) { 50 TestFn(CR1, CR2); 51 }); 52 }); 53 } 54 55 template<typename Fn> 56 static void ForeachNumInConstantRange(const ConstantRange &CR, Fn TestFn) { 57 if (!CR.isEmptySet()) { 58 APInt N = CR.getLower(); 59 do TestFn(N); 60 while (++N != CR.getUpper()); 61 } 62 } 63 64 using PreferFn = llvm::function_ref<bool(const ConstantRange &, 65 const ConstantRange &)>; 66 67 bool PreferSmallest(const ConstantRange &CR1, const ConstantRange &CR2) { 68 return CR1.isSizeStrictlySmallerThan(CR2); 69 } 70 71 bool PreferSmallestUnsigned(const ConstantRange &CR1, 72 const ConstantRange &CR2) { 73 if (CR1.isWrappedSet() != CR2.isWrappedSet()) 74 return CR1.isWrappedSet() < CR2.isWrappedSet(); 75 return PreferSmallest(CR1, CR2); 76 } 77 78 bool PreferSmallestSigned(const ConstantRange &CR1, const ConstantRange &CR2) { 79 if (CR1.isSignWrappedSet() != CR2.isSignWrappedSet()) 80 return CR1.isSignWrappedSet() < CR2.isSignWrappedSet(); 81 return PreferSmallest(CR1, CR2); 82 } 83 84 bool PreferSmallestNonFullUnsigned(const ConstantRange &CR1, 85 const ConstantRange &CR2) { 86 if (CR1.isFullSet() != CR2.isFullSet()) 87 return CR1.isFullSet() < CR2.isFullSet(); 88 return PreferSmallestUnsigned(CR1, CR2); 89 } 90 91 bool PreferSmallestNonFullSigned(const ConstantRange &CR1, 92 const ConstantRange &CR2) { 93 if (CR1.isFullSet() != CR2.isFullSet()) 94 return CR1.isFullSet() < CR2.isFullSet(); 95 return PreferSmallestSigned(CR1, CR2); 96 } 97 98 testing::AssertionResult rangeContains(const ConstantRange &CR, const APInt &N, 99 ArrayRef<ConstantRange> Inputs) { 100 if (CR.contains(N)) 101 return testing::AssertionSuccess(); 102 103 testing::AssertionResult Result = testing::AssertionFailure(); 104 Result << CR << " does not contain " << N << " for inputs: "; 105 for (const ConstantRange &Input : Inputs) 106 Result << Input << ", "; 107 return Result; 108 } 109 110 // Check whether constant range CR is an optimal approximation of the set 111 // Elems under the given PreferenceFn. The preference function should return 112 // true if the first range argument is strictly preferred to the second one. 113 static void TestRange(const ConstantRange &CR, const SmallBitVector &Elems, 114 PreferFn PreferenceFn, ArrayRef<ConstantRange> Inputs, 115 bool CheckOptimality = true) { 116 unsigned BitWidth = CR.getBitWidth(); 117 118 // Check conservative correctness. 119 for (unsigned Elem : Elems.set_bits()) { 120 EXPECT_TRUE(rangeContains(CR, APInt(BitWidth, Elem), Inputs)); 121 } 122 123 if (!CheckOptimality) 124 return; 125 126 // Make sure we have at least one element for the code below. 127 if (Elems.none()) { 128 EXPECT_TRUE(CR.isEmptySet()); 129 return; 130 } 131 132 auto NotPreferred = [&](const ConstantRange &PossibleCR) { 133 if (!PreferenceFn(PossibleCR, CR)) 134 return testing::AssertionSuccess(); 135 136 testing::AssertionResult Result = testing::AssertionFailure(); 137 Result << "Inputs = "; 138 for (const ConstantRange &Input : Inputs) 139 Result << Input << ", "; 140 Result << "CR = " << CR << ", BetterCR = " << PossibleCR; 141 return Result; 142 }; 143 144 // Look at all pairs of adjacent elements and the slack-free ranges 145 // [Elem, PrevElem] they imply. Check that none of the ranges are strictly 146 // preferred over the computed range (they may have equal preference). 147 int FirstElem = Elems.find_first(); 148 int PrevElem = FirstElem, Elem; 149 do { 150 Elem = Elems.find_next(PrevElem); 151 if (Elem < 0) 152 Elem = FirstElem; // Wrap around to first element. 153 154 ConstantRange PossibleCR = 155 ConstantRange::getNonEmpty(APInt(BitWidth, Elem), 156 APInt(BitWidth, PrevElem) + 1); 157 // We get a full range any time PrevElem and Elem are adjacent. Avoid 158 // repeated checks by skipping here, and explicitly checking below instead. 159 if (!PossibleCR.isFullSet()) { 160 EXPECT_TRUE(NotPreferred(PossibleCR)); 161 } 162 163 PrevElem = Elem; 164 } while (Elem != FirstElem); 165 166 EXPECT_TRUE(NotPreferred(ConstantRange::getFull(BitWidth))); 167 } 168 169 using UnaryRangeFn = llvm::function_ref<ConstantRange(const ConstantRange &)>; 170 using UnaryIntFn = llvm::function_ref<Optional<APInt>(const APInt &)>; 171 172 static void TestUnaryOpExhaustive(UnaryRangeFn RangeFn, UnaryIntFn IntFn, 173 PreferFn PreferenceFn = PreferSmallest) { 174 unsigned Bits = 4; 175 EnumerateConstantRanges(Bits, [&](const ConstantRange &CR) { 176 SmallBitVector Elems(1 << Bits); 177 ForeachNumInConstantRange(CR, [&](const APInt &N) { 178 if (Optional<APInt> ResultN = IntFn(N)) 179 Elems.set(ResultN->getZExtValue()); 180 }); 181 TestRange(RangeFn(CR), Elems, PreferenceFn, {CR}); 182 }); 183 } 184 185 using BinaryRangeFn = llvm::function_ref<ConstantRange(const ConstantRange &, 186 const ConstantRange &)>; 187 using BinaryIntFn = llvm::function_ref<Optional<APInt>(const APInt &, 188 const APInt &)>; 189 using BinaryCheckFn = llvm::function_ref<bool(const ConstantRange &, 190 const ConstantRange &)>; 191 192 static bool CheckAll(const ConstantRange &, const ConstantRange &) { 193 return true; 194 } 195 196 static bool CheckSingleElementsOnly(const ConstantRange &CR1, 197 const ConstantRange &CR2) { 198 return CR1.isSingleElement() && CR2.isSingleElement(); 199 } 200 201 // CheckFn determines whether optimality is checked for a given range pair. 202 // Correctness is always checked. 203 static void TestBinaryOpExhaustive(BinaryRangeFn RangeFn, BinaryIntFn IntFn, 204 PreferFn PreferenceFn = PreferSmallest, 205 BinaryCheckFn CheckFn = CheckAll) { 206 unsigned Bits = 4; 207 EnumerateTwoConstantRanges( 208 Bits, [&](const ConstantRange &CR1, const ConstantRange &CR2) { 209 SmallBitVector Elems(1 << Bits); 210 ForeachNumInConstantRange(CR1, [&](const APInt &N1) { 211 ForeachNumInConstantRange(CR2, [&](const APInt &N2) { 212 if (Optional<APInt> ResultN = IntFn(N1, N2)) 213 Elems.set(ResultN->getZExtValue()); 214 }); 215 }); 216 TestRange(RangeFn(CR1, CR2), Elems, PreferenceFn, {CR1, CR2}, 217 CheckFn(CR1, CR2)); 218 }); 219 } 220 221 struct OpRangeGathererBase { 222 void account(const APInt &N); 223 ConstantRange getRange(); 224 }; 225 226 struct UnsignedOpRangeGatherer : public OpRangeGathererBase { 227 APInt Min; 228 APInt Max; 229 230 UnsignedOpRangeGatherer(unsigned Bits) 231 : Min(APInt::getMaxValue(Bits)), Max(APInt::getMinValue(Bits)) {} 232 233 void account(const APInt &N) { 234 if (N.ult(Min)) 235 Min = N; 236 if (N.ugt(Max)) 237 Max = N; 238 } 239 240 ConstantRange getRange() { 241 if (Min.ugt(Max)) 242 return ConstantRange::getEmpty(Min.getBitWidth()); 243 return ConstantRange::getNonEmpty(Min, Max + 1); 244 } 245 }; 246 247 struct SignedOpRangeGatherer : public OpRangeGathererBase { 248 APInt Min; 249 APInt Max; 250 251 SignedOpRangeGatherer(unsigned Bits) 252 : Min(APInt::getSignedMaxValue(Bits)), 253 Max(APInt::getSignedMinValue(Bits)) {} 254 255 void account(const APInt &N) { 256 if (N.slt(Min)) 257 Min = N; 258 if (N.sgt(Max)) 259 Max = N; 260 } 261 262 ConstantRange getRange() { 263 if (Min.sgt(Max)) 264 return ConstantRange::getEmpty(Min.getBitWidth()); 265 return ConstantRange::getNonEmpty(Min, Max + 1); 266 } 267 }; 268 269 ConstantRange ConstantRangeTest::Full(16, true); 270 ConstantRange ConstantRangeTest::Empty(16, false); 271 ConstantRange ConstantRangeTest::One(APInt(16, 0xa)); 272 ConstantRange ConstantRangeTest::Some(APInt(16, 0xa), APInt(16, 0xaaa)); 273 ConstantRange ConstantRangeTest::Wrap(APInt(16, 0xaaa), APInt(16, 0xa)); 274 275 TEST_F(ConstantRangeTest, Basics) { 276 EXPECT_TRUE(Full.isFullSet()); 277 EXPECT_FALSE(Full.isEmptySet()); 278 EXPECT_TRUE(Full.inverse().isEmptySet()); 279 EXPECT_FALSE(Full.isWrappedSet()); 280 EXPECT_TRUE(Full.contains(APInt(16, 0x0))); 281 EXPECT_TRUE(Full.contains(APInt(16, 0x9))); 282 EXPECT_TRUE(Full.contains(APInt(16, 0xa))); 283 EXPECT_TRUE(Full.contains(APInt(16, 0xaa9))); 284 EXPECT_TRUE(Full.contains(APInt(16, 0xaaa))); 285 286 EXPECT_FALSE(Empty.isFullSet()); 287 EXPECT_TRUE(Empty.isEmptySet()); 288 EXPECT_TRUE(Empty.inverse().isFullSet()); 289 EXPECT_FALSE(Empty.isWrappedSet()); 290 EXPECT_FALSE(Empty.contains(APInt(16, 0x0))); 291 EXPECT_FALSE(Empty.contains(APInt(16, 0x9))); 292 EXPECT_FALSE(Empty.contains(APInt(16, 0xa))); 293 EXPECT_FALSE(Empty.contains(APInt(16, 0xaa9))); 294 EXPECT_FALSE(Empty.contains(APInt(16, 0xaaa))); 295 296 EXPECT_FALSE(One.isFullSet()); 297 EXPECT_FALSE(One.isEmptySet()); 298 EXPECT_FALSE(One.isWrappedSet()); 299 EXPECT_FALSE(One.contains(APInt(16, 0x0))); 300 EXPECT_FALSE(One.contains(APInt(16, 0x9))); 301 EXPECT_TRUE(One.contains(APInt(16, 0xa))); 302 EXPECT_FALSE(One.contains(APInt(16, 0xaa9))); 303 EXPECT_FALSE(One.contains(APInt(16, 0xaaa))); 304 EXPECT_FALSE(One.inverse().contains(APInt(16, 0xa))); 305 306 EXPECT_FALSE(Some.isFullSet()); 307 EXPECT_FALSE(Some.isEmptySet()); 308 EXPECT_FALSE(Some.isWrappedSet()); 309 EXPECT_FALSE(Some.contains(APInt(16, 0x0))); 310 EXPECT_FALSE(Some.contains(APInt(16, 0x9))); 311 EXPECT_TRUE(Some.contains(APInt(16, 0xa))); 312 EXPECT_TRUE(Some.contains(APInt(16, 0xaa9))); 313 EXPECT_FALSE(Some.contains(APInt(16, 0xaaa))); 314 315 EXPECT_FALSE(Wrap.isFullSet()); 316 EXPECT_FALSE(Wrap.isEmptySet()); 317 EXPECT_TRUE(Wrap.isWrappedSet()); 318 EXPECT_TRUE(Wrap.contains(APInt(16, 0x0))); 319 EXPECT_TRUE(Wrap.contains(APInt(16, 0x9))); 320 EXPECT_FALSE(Wrap.contains(APInt(16, 0xa))); 321 EXPECT_FALSE(Wrap.contains(APInt(16, 0xaa9))); 322 EXPECT_TRUE(Wrap.contains(APInt(16, 0xaaa))); 323 } 324 325 TEST_F(ConstantRangeTest, Equality) { 326 EXPECT_EQ(Full, Full); 327 EXPECT_EQ(Empty, Empty); 328 EXPECT_EQ(One, One); 329 EXPECT_EQ(Some, Some); 330 EXPECT_EQ(Wrap, Wrap); 331 EXPECT_NE(Full, Empty); 332 EXPECT_NE(Full, One); 333 EXPECT_NE(Full, Some); 334 EXPECT_NE(Full, Wrap); 335 EXPECT_NE(Empty, One); 336 EXPECT_NE(Empty, Some); 337 EXPECT_NE(Empty, Wrap); 338 EXPECT_NE(One, Some); 339 EXPECT_NE(One, Wrap); 340 EXPECT_NE(Some, Wrap); 341 } 342 343 TEST_F(ConstantRangeTest, SingleElement) { 344 EXPECT_EQ(Full.getSingleElement(), static_cast<APInt *>(nullptr)); 345 EXPECT_EQ(Empty.getSingleElement(), static_cast<APInt *>(nullptr)); 346 EXPECT_EQ(Full.getSingleMissingElement(), static_cast<APInt *>(nullptr)); 347 EXPECT_EQ(Empty.getSingleMissingElement(), static_cast<APInt *>(nullptr)); 348 349 EXPECT_EQ(*One.getSingleElement(), APInt(16, 0xa)); 350 EXPECT_EQ(Some.getSingleElement(), static_cast<APInt *>(nullptr)); 351 EXPECT_EQ(Wrap.getSingleElement(), static_cast<APInt *>(nullptr)); 352 353 EXPECT_EQ(One.getSingleMissingElement(), static_cast<APInt *>(nullptr)); 354 EXPECT_EQ(Some.getSingleMissingElement(), static_cast<APInt *>(nullptr)); 355 356 ConstantRange OneInverse = One.inverse(); 357 EXPECT_EQ(*OneInverse.getSingleMissingElement(), *One.getSingleElement()); 358 359 EXPECT_FALSE(Full.isSingleElement()); 360 EXPECT_FALSE(Empty.isSingleElement()); 361 EXPECT_TRUE(One.isSingleElement()); 362 EXPECT_FALSE(Some.isSingleElement()); 363 EXPECT_FALSE(Wrap.isSingleElement()); 364 } 365 366 TEST_F(ConstantRangeTest, GetMinsAndMaxes) { 367 EXPECT_EQ(Full.getUnsignedMax(), APInt(16, UINT16_MAX)); 368 EXPECT_EQ(One.getUnsignedMax(), APInt(16, 0xa)); 369 EXPECT_EQ(Some.getUnsignedMax(), APInt(16, 0xaa9)); 370 EXPECT_EQ(Wrap.getUnsignedMax(), APInt(16, UINT16_MAX)); 371 372 EXPECT_EQ(Full.getUnsignedMin(), APInt(16, 0)); 373 EXPECT_EQ(One.getUnsignedMin(), APInt(16, 0xa)); 374 EXPECT_EQ(Some.getUnsignedMin(), APInt(16, 0xa)); 375 EXPECT_EQ(Wrap.getUnsignedMin(), APInt(16, 0)); 376 377 EXPECT_EQ(Full.getSignedMax(), APInt(16, INT16_MAX)); 378 EXPECT_EQ(One.getSignedMax(), APInt(16, 0xa)); 379 EXPECT_EQ(Some.getSignedMax(), APInt(16, 0xaa9)); 380 EXPECT_EQ(Wrap.getSignedMax(), APInt(16, INT16_MAX)); 381 382 EXPECT_EQ(Full.getSignedMin(), APInt(16, (uint64_t)INT16_MIN)); 383 EXPECT_EQ(One.getSignedMin(), APInt(16, 0xa)); 384 EXPECT_EQ(Some.getSignedMin(), APInt(16, 0xa)); 385 EXPECT_EQ(Wrap.getSignedMin(), APInt(16, (uint64_t)INT16_MIN)); 386 387 // Found by Klee 388 EXPECT_EQ(ConstantRange(APInt(4, 7), APInt(4, 0)).getSignedMax(), 389 APInt(4, 7)); 390 } 391 392 TEST_F(ConstantRangeTest, SignWrapped) { 393 EXPECT_FALSE(Full.isSignWrappedSet()); 394 EXPECT_FALSE(Empty.isSignWrappedSet()); 395 EXPECT_FALSE(One.isSignWrappedSet()); 396 EXPECT_FALSE(Some.isSignWrappedSet()); 397 EXPECT_TRUE(Wrap.isSignWrappedSet()); 398 399 EXPECT_FALSE(ConstantRange(APInt(8, 127), APInt(8, 128)).isSignWrappedSet()); 400 EXPECT_TRUE(ConstantRange(APInt(8, 127), APInt(8, 129)).isSignWrappedSet()); 401 EXPECT_FALSE(ConstantRange(APInt(8, 128), APInt(8, 129)).isSignWrappedSet()); 402 EXPECT_TRUE(ConstantRange(APInt(8, 10), APInt(8, 9)).isSignWrappedSet()); 403 EXPECT_TRUE(ConstantRange(APInt(8, 10), APInt(8, 250)).isSignWrappedSet()); 404 EXPECT_FALSE(ConstantRange(APInt(8, 250), APInt(8, 10)).isSignWrappedSet()); 405 EXPECT_FALSE(ConstantRange(APInt(8, 250), APInt(8, 251)).isSignWrappedSet()); 406 } 407 408 TEST_F(ConstantRangeTest, UpperWrapped) { 409 // The behavior here is the same as for isWrappedSet() / isSignWrappedSet(). 410 EXPECT_FALSE(Full.isUpperWrapped()); 411 EXPECT_FALSE(Empty.isUpperWrapped()); 412 EXPECT_FALSE(One.isUpperWrapped()); 413 EXPECT_FALSE(Some.isUpperWrapped()); 414 EXPECT_TRUE(Wrap.isUpperWrapped()); 415 EXPECT_FALSE(Full.isUpperSignWrapped()); 416 EXPECT_FALSE(Empty.isUpperSignWrapped()); 417 EXPECT_FALSE(One.isUpperSignWrapped()); 418 EXPECT_FALSE(Some.isUpperSignWrapped()); 419 EXPECT_TRUE(Wrap.isUpperSignWrapped()); 420 421 // The behavior differs if Upper is the Min/SignedMin value. 422 ConstantRange CR1(APInt(8, 42), APInt::getMinValue(8)); 423 EXPECT_FALSE(CR1.isWrappedSet()); 424 EXPECT_TRUE(CR1.isUpperWrapped()); 425 426 ConstantRange CR2(APInt(8, 42), APInt::getSignedMinValue(8)); 427 EXPECT_FALSE(CR2.isSignWrappedSet()); 428 EXPECT_TRUE(CR2.isUpperSignWrapped()); 429 } 430 431 TEST_F(ConstantRangeTest, Trunc) { 432 ConstantRange TFull = Full.truncate(10); 433 ConstantRange TEmpty = Empty.truncate(10); 434 ConstantRange TOne = One.truncate(10); 435 ConstantRange TSome = Some.truncate(10); 436 ConstantRange TWrap = Wrap.truncate(10); 437 EXPECT_TRUE(TFull.isFullSet()); 438 EXPECT_TRUE(TEmpty.isEmptySet()); 439 EXPECT_EQ(TOne, ConstantRange(One.getLower().trunc(10), 440 One.getUpper().trunc(10))); 441 EXPECT_TRUE(TSome.isFullSet()); 442 EXPECT_TRUE(TWrap.isFullSet()); 443 444 // trunc([2, 5), 3->2) = [2, 1) 445 ConstantRange TwoFive(APInt(3, 2), APInt(3, 5)); 446 EXPECT_EQ(TwoFive.truncate(2), ConstantRange(APInt(2, 2), APInt(2, 1))); 447 448 // trunc([2, 6), 3->2) = full 449 ConstantRange TwoSix(APInt(3, 2), APInt(3, 6)); 450 EXPECT_TRUE(TwoSix.truncate(2).isFullSet()); 451 452 // trunc([5, 7), 3->2) = [1, 3) 453 ConstantRange FiveSeven(APInt(3, 5), APInt(3, 7)); 454 EXPECT_EQ(FiveSeven.truncate(2), ConstantRange(APInt(2, 1), APInt(2, 3))); 455 456 // trunc([7, 1), 3->2) = [3, 1) 457 ConstantRange SevenOne(APInt(3, 7), APInt(3, 1)); 458 EXPECT_EQ(SevenOne.truncate(2), ConstantRange(APInt(2, 3), APInt(2, 1))); 459 } 460 461 TEST_F(ConstantRangeTest, ZExt) { 462 ConstantRange ZFull = Full.zeroExtend(20); 463 ConstantRange ZEmpty = Empty.zeroExtend(20); 464 ConstantRange ZOne = One.zeroExtend(20); 465 ConstantRange ZSome = Some.zeroExtend(20); 466 ConstantRange ZWrap = Wrap.zeroExtend(20); 467 EXPECT_EQ(ZFull, ConstantRange(APInt(20, 0), APInt(20, 0x10000))); 468 EXPECT_TRUE(ZEmpty.isEmptySet()); 469 EXPECT_EQ(ZOne, ConstantRange(One.getLower().zext(20), 470 One.getUpper().zext(20))); 471 EXPECT_EQ(ZSome, ConstantRange(Some.getLower().zext(20), 472 Some.getUpper().zext(20))); 473 EXPECT_EQ(ZWrap, ConstantRange(APInt(20, 0), APInt(20, 0x10000))); 474 475 // zext([5, 0), 3->7) = [5, 8) 476 ConstantRange FiveZero(APInt(3, 5), APInt(3, 0)); 477 EXPECT_EQ(FiveZero.zeroExtend(7), ConstantRange(APInt(7, 5), APInt(7, 8))); 478 } 479 480 TEST_F(ConstantRangeTest, SExt) { 481 ConstantRange SFull = Full.signExtend(20); 482 ConstantRange SEmpty = Empty.signExtend(20); 483 ConstantRange SOne = One.signExtend(20); 484 ConstantRange SSome = Some.signExtend(20); 485 ConstantRange SWrap = Wrap.signExtend(20); 486 EXPECT_EQ(SFull, ConstantRange(APInt(20, (uint64_t)INT16_MIN, true), 487 APInt(20, INT16_MAX + 1, true))); 488 EXPECT_TRUE(SEmpty.isEmptySet()); 489 EXPECT_EQ(SOne, ConstantRange(One.getLower().sext(20), 490 One.getUpper().sext(20))); 491 EXPECT_EQ(SSome, ConstantRange(Some.getLower().sext(20), 492 Some.getUpper().sext(20))); 493 EXPECT_EQ(SWrap, ConstantRange(APInt(20, (uint64_t)INT16_MIN, true), 494 APInt(20, INT16_MAX + 1, true))); 495 496 EXPECT_EQ(ConstantRange(APInt(8, 120), APInt(8, 140)).signExtend(16), 497 ConstantRange(APInt(16, -128), APInt(16, 128))); 498 499 EXPECT_EQ(ConstantRange(APInt(16, 0x0200), APInt(16, 0x8000)).signExtend(19), 500 ConstantRange(APInt(19, 0x0200), APInt(19, 0x8000))); 501 } 502 503 TEST_F(ConstantRangeTest, IntersectWith) { 504 EXPECT_EQ(Empty.intersectWith(Full), Empty); 505 EXPECT_EQ(Empty.intersectWith(Empty), Empty); 506 EXPECT_EQ(Empty.intersectWith(One), Empty); 507 EXPECT_EQ(Empty.intersectWith(Some), Empty); 508 EXPECT_EQ(Empty.intersectWith(Wrap), Empty); 509 EXPECT_EQ(Full.intersectWith(Full), Full); 510 EXPECT_EQ(Some.intersectWith(Some), Some); 511 EXPECT_EQ(Some.intersectWith(One), One); 512 EXPECT_EQ(Full.intersectWith(One), One); 513 EXPECT_EQ(Full.intersectWith(Some), Some); 514 EXPECT_EQ(Some.intersectWith(Wrap), Empty); 515 EXPECT_EQ(One.intersectWith(Wrap), Empty); 516 EXPECT_EQ(One.intersectWith(Wrap), Wrap.intersectWith(One)); 517 518 // Klee generated testcase from PR4545. 519 // The intersection of i16 [4, 2) and [6, 5) is disjoint, looking like 520 // 01..4.6789ABCDEF where the dots represent values not in the intersection. 521 ConstantRange LHS(APInt(16, 4), APInt(16, 2)); 522 ConstantRange RHS(APInt(16, 6), APInt(16, 5)); 523 EXPECT_TRUE(LHS.intersectWith(RHS) == LHS); 524 525 // previous bug: intersection of [min, 3) and [2, max) should be 2 526 LHS = ConstantRange(APInt(32, -2147483646), APInt(32, 3)); 527 RHS = ConstantRange(APInt(32, 2), APInt(32, 2147483646)); 528 EXPECT_EQ(LHS.intersectWith(RHS), ConstantRange(APInt(32, 2))); 529 530 // [2, 0) /\ [4, 3) = [2, 0) 531 LHS = ConstantRange(APInt(32, 2), APInt(32, 0)); 532 RHS = ConstantRange(APInt(32, 4), APInt(32, 3)); 533 EXPECT_EQ(LHS.intersectWith(RHS), ConstantRange(APInt(32, 2), APInt(32, 0))); 534 535 // [2, 0) /\ [4, 2) = [4, 0) 536 LHS = ConstantRange(APInt(32, 2), APInt(32, 0)); 537 RHS = ConstantRange(APInt(32, 4), APInt(32, 2)); 538 EXPECT_EQ(LHS.intersectWith(RHS), ConstantRange(APInt(32, 4), APInt(32, 0))); 539 540 // [4, 2) /\ [5, 1) = [5, 1) 541 LHS = ConstantRange(APInt(32, 4), APInt(32, 2)); 542 RHS = ConstantRange(APInt(32, 5), APInt(32, 1)); 543 EXPECT_EQ(LHS.intersectWith(RHS), ConstantRange(APInt(32, 5), APInt(32, 1))); 544 545 // [2, 0) /\ [7, 4) = [7, 4) 546 LHS = ConstantRange(APInt(32, 2), APInt(32, 0)); 547 RHS = ConstantRange(APInt(32, 7), APInt(32, 4)); 548 EXPECT_EQ(LHS.intersectWith(RHS), ConstantRange(APInt(32, 7), APInt(32, 4))); 549 550 // [4, 2) /\ [1, 0) = [1, 0) 551 LHS = ConstantRange(APInt(32, 4), APInt(32, 2)); 552 RHS = ConstantRange(APInt(32, 1), APInt(32, 0)); 553 EXPECT_EQ(LHS.intersectWith(RHS), ConstantRange(APInt(32, 4), APInt(32, 2))); 554 555 // [15, 0) /\ [7, 6) = [15, 0) 556 LHS = ConstantRange(APInt(32, 15), APInt(32, 0)); 557 RHS = ConstantRange(APInt(32, 7), APInt(32, 6)); 558 EXPECT_EQ(LHS.intersectWith(RHS), ConstantRange(APInt(32, 15), APInt(32, 0))); 559 } 560 561 template<typename Fn1, typename Fn2> 562 void testBinarySetOperationExhaustive(Fn1 OpFn, Fn2 InResultFn) { 563 unsigned Bits = 4; 564 EnumerateTwoConstantRanges(Bits, 565 [=](const ConstantRange &CR1, const ConstantRange &CR2) { 566 SmallBitVector Elems(1 << Bits); 567 APInt Num(Bits, 0); 568 for (unsigned I = 0, Limit = 1 << Bits; I < Limit; ++I, ++Num) 569 if (InResultFn(CR1, CR2, Num)) 570 Elems.set(Num.getZExtValue()); 571 572 ConstantRange SmallestCR = OpFn(CR1, CR2, ConstantRange::Smallest); 573 TestRange(SmallestCR, Elems, PreferSmallest, {CR1, CR2}); 574 575 ConstantRange UnsignedCR = OpFn(CR1, CR2, ConstantRange::Unsigned); 576 TestRange(UnsignedCR, Elems, PreferSmallestNonFullUnsigned, {CR1, CR2}); 577 578 ConstantRange SignedCR = OpFn(CR1, CR2, ConstantRange::Signed); 579 TestRange(SignedCR, Elems, PreferSmallestNonFullSigned, {CR1, CR2}); 580 }); 581 } 582 583 TEST_F(ConstantRangeTest, IntersectWithExhaustive) { 584 testBinarySetOperationExhaustive( 585 [](const ConstantRange &CR1, const ConstantRange &CR2, 586 ConstantRange::PreferredRangeType Type) { 587 return CR1.intersectWith(CR2, Type); 588 }, 589 [](const ConstantRange &CR1, const ConstantRange &CR2, const APInt &N) { 590 return CR1.contains(N) && CR2.contains(N); 591 }); 592 } 593 594 TEST_F(ConstantRangeTest, UnionWithExhaustive) { 595 testBinarySetOperationExhaustive( 596 [](const ConstantRange &CR1, const ConstantRange &CR2, 597 ConstantRange::PreferredRangeType Type) { 598 return CR1.unionWith(CR2, Type); 599 }, 600 [](const ConstantRange &CR1, const ConstantRange &CR2, const APInt &N) { 601 return CR1.contains(N) || CR2.contains(N); 602 }); 603 } 604 605 TEST_F(ConstantRangeTest, UnionWith) { 606 EXPECT_EQ(Wrap.unionWith(One), 607 ConstantRange(APInt(16, 0xaaa), APInt(16, 0xb))); 608 EXPECT_EQ(One.unionWith(Wrap), Wrap.unionWith(One)); 609 EXPECT_EQ(Empty.unionWith(Empty), Empty); 610 EXPECT_EQ(Full.unionWith(Full), Full); 611 EXPECT_EQ(Some.unionWith(Wrap), Full); 612 613 // PR4545 614 EXPECT_EQ(ConstantRange(APInt(16, 14), APInt(16, 1)).unionWith( 615 ConstantRange(APInt(16, 0), APInt(16, 8))), 616 ConstantRange(APInt(16, 14), APInt(16, 8))); 617 EXPECT_EQ(ConstantRange(APInt(16, 6), APInt(16, 4)).unionWith( 618 ConstantRange(APInt(16, 4), APInt(16, 0))), 619 ConstantRange::getFull(16)); 620 EXPECT_EQ(ConstantRange(APInt(16, 1), APInt(16, 0)).unionWith( 621 ConstantRange(APInt(16, 2), APInt(16, 1))), 622 ConstantRange::getFull(16)); 623 } 624 625 TEST_F(ConstantRangeTest, SetDifference) { 626 EXPECT_EQ(Full.difference(Empty), Full); 627 EXPECT_EQ(Full.difference(Full), Empty); 628 EXPECT_EQ(Empty.difference(Empty), Empty); 629 EXPECT_EQ(Empty.difference(Full), Empty); 630 631 ConstantRange A(APInt(16, 3), APInt(16, 7)); 632 ConstantRange B(APInt(16, 5), APInt(16, 9)); 633 ConstantRange C(APInt(16, 3), APInt(16, 5)); 634 ConstantRange D(APInt(16, 7), APInt(16, 9)); 635 ConstantRange E(APInt(16, 5), APInt(16, 4)); 636 ConstantRange F(APInt(16, 7), APInt(16, 3)); 637 EXPECT_EQ(A.difference(B), C); 638 EXPECT_EQ(B.difference(A), D); 639 EXPECT_EQ(E.difference(A), F); 640 } 641 642 TEST_F(ConstantRangeTest, getActiveBits) { 643 unsigned Bits = 4; 644 EnumerateConstantRanges(Bits, [&](const ConstantRange &CR) { 645 unsigned Exact = 0; 646 ForeachNumInConstantRange(CR, [&](const APInt &N) { 647 Exact = std::max(Exact, N.getActiveBits()); 648 }); 649 650 unsigned ResultCR = CR.getActiveBits(); 651 EXPECT_EQ(Exact, ResultCR); 652 }); 653 } 654 TEST_F(ConstantRangeTest, losslessUnsignedTruncationZeroext) { 655 unsigned Bits = 4; 656 EnumerateConstantRanges(Bits, [&](const ConstantRange &CR) { 657 unsigned MinBitWidth = CR.getActiveBits(); 658 if (MinBitWidth == 0) { 659 EXPECT_TRUE(CR.isEmptySet() || 660 (CR.isSingleElement() && CR.getSingleElement()->isZero())); 661 return; 662 } 663 if (MinBitWidth == Bits) 664 return; 665 EXPECT_EQ(CR, CR.truncate(MinBitWidth).zeroExtend(Bits)); 666 }); 667 } 668 669 TEST_F(ConstantRangeTest, getMinSignedBits) { 670 unsigned Bits = 4; 671 EnumerateConstantRanges(Bits, [&](const ConstantRange &CR) { 672 unsigned Exact = 0; 673 ForeachNumInConstantRange(CR, [&](const APInt &N) { 674 Exact = std::max(Exact, N.getMinSignedBits()); 675 }); 676 677 unsigned ResultCR = CR.getMinSignedBits(); 678 EXPECT_EQ(Exact, ResultCR); 679 }); 680 } 681 TEST_F(ConstantRangeTest, losslessSignedTruncationSignext) { 682 unsigned Bits = 4; 683 EnumerateConstantRanges(Bits, [&](const ConstantRange &CR) { 684 unsigned MinBitWidth = CR.getMinSignedBits(); 685 if (MinBitWidth == 0) { 686 EXPECT_TRUE(CR.isEmptySet()); 687 return; 688 } 689 if (MinBitWidth == Bits) 690 return; 691 EXPECT_EQ(CR, CR.truncate(MinBitWidth).signExtend(Bits)); 692 }); 693 } 694 695 TEST_F(ConstantRangeTest, SubtractAPInt) { 696 EXPECT_EQ(Full.subtract(APInt(16, 4)), Full); 697 EXPECT_EQ(Empty.subtract(APInt(16, 4)), Empty); 698 EXPECT_EQ(Some.subtract(APInt(16, 4)), 699 ConstantRange(APInt(16, 0x6), APInt(16, 0xaa6))); 700 EXPECT_EQ(Wrap.subtract(APInt(16, 4)), 701 ConstantRange(APInt(16, 0xaa6), APInt(16, 0x6))); 702 EXPECT_EQ(One.subtract(APInt(16, 4)), 703 ConstantRange(APInt(16, 0x6))); 704 } 705 706 TEST_F(ConstantRangeTest, Add) { 707 EXPECT_EQ(Full.add(APInt(16, 4)), Full); 708 EXPECT_EQ(Full.add(Full), Full); 709 EXPECT_EQ(Full.add(Empty), Empty); 710 EXPECT_EQ(Full.add(One), Full); 711 EXPECT_EQ(Full.add(Some), Full); 712 EXPECT_EQ(Full.add(Wrap), Full); 713 EXPECT_EQ(Empty.add(Empty), Empty); 714 EXPECT_EQ(Empty.add(One), Empty); 715 EXPECT_EQ(Empty.add(Some), Empty); 716 EXPECT_EQ(Empty.add(Wrap), Empty); 717 EXPECT_EQ(Empty.add(APInt(16, 4)), Empty); 718 EXPECT_EQ(Some.add(APInt(16, 4)), 719 ConstantRange(APInt(16, 0xe), APInt(16, 0xaae))); 720 EXPECT_EQ(Wrap.add(APInt(16, 4)), 721 ConstantRange(APInt(16, 0xaae), APInt(16, 0xe))); 722 EXPECT_EQ(One.add(APInt(16, 4)), 723 ConstantRange(APInt(16, 0xe))); 724 725 TestBinaryOpExhaustive( 726 [](const ConstantRange &CR1, const ConstantRange &CR2) { 727 return CR1.add(CR2); 728 }, 729 [](const APInt &N1, const APInt &N2) { 730 return N1 + N2; 731 }); 732 } 733 734 template <typename Fn1, typename Fn2> 735 static void TestAddWithNoSignedWrapExhaustive(Fn1 RangeFn, Fn2 IntFn) { 736 unsigned Bits = 4; 737 EnumerateTwoConstantRanges(Bits, [&](const ConstantRange &CR1, 738 const ConstantRange &CR2) { 739 ConstantRange CR = RangeFn(CR1, CR2); 740 SignedOpRangeGatherer R(CR.getBitWidth()); 741 bool AllOverflow = true; 742 ForeachNumInConstantRange(CR1, [&](const APInt &N1) { 743 ForeachNumInConstantRange(CR2, [&](const APInt &N2) { 744 bool IsOverflow = false; 745 APInt N = IntFn(IsOverflow, N1, N2); 746 if (!IsOverflow) { 747 AllOverflow = false; 748 R.account(N); 749 EXPECT_TRUE(CR.contains(N)); 750 } 751 }); 752 }); 753 754 EXPECT_EQ(CR.isEmptySet(), AllOverflow); 755 756 if (CR1.isSignWrappedSet() || CR2.isSignWrappedSet()) 757 return; 758 759 ConstantRange Exact = R.getRange(); 760 EXPECT_EQ(Exact, CR); 761 }); 762 } 763 764 template <typename Fn1, typename Fn2> 765 static void TestAddWithNoUnsignedWrapExhaustive(Fn1 RangeFn, Fn2 IntFn) { 766 unsigned Bits = 4; 767 EnumerateTwoConstantRanges(Bits, [&](const ConstantRange &CR1, 768 const ConstantRange &CR2) { 769 ConstantRange CR = RangeFn(CR1, CR2); 770 UnsignedOpRangeGatherer R(CR.getBitWidth()); 771 bool AllOverflow = true; 772 ForeachNumInConstantRange(CR1, [&](const APInt &N1) { 773 ForeachNumInConstantRange(CR2, [&](const APInt &N2) { 774 bool IsOverflow = false; 775 APInt N = IntFn(IsOverflow, N1, N2); 776 if (!IsOverflow) { 777 AllOverflow = false; 778 R.account(N); 779 EXPECT_TRUE(CR.contains(N)); 780 } 781 }); 782 }); 783 784 EXPECT_EQ(CR.isEmptySet(), AllOverflow); 785 786 if (CR1.isWrappedSet() || CR2.isWrappedSet()) 787 return; 788 789 ConstantRange Exact = R.getRange(); 790 EXPECT_EQ(Exact, CR); 791 }); 792 } 793 794 template <typename Fn1, typename Fn2, typename Fn3> 795 static void TestAddWithNoSignedUnsignedWrapExhaustive(Fn1 RangeFn, 796 Fn2 IntFnSigned, 797 Fn3 IntFnUnsigned) { 798 unsigned Bits = 4; 799 EnumerateTwoConstantRanges( 800 Bits, [&](const ConstantRange &CR1, const ConstantRange &CR2) { 801 ConstantRange CR = RangeFn(CR1, CR2); 802 UnsignedOpRangeGatherer UR(CR.getBitWidth()); 803 SignedOpRangeGatherer SR(CR.getBitWidth()); 804 bool AllOverflow = true; 805 ForeachNumInConstantRange(CR1, [&](const APInt &N1) { 806 ForeachNumInConstantRange(CR2, [&](const APInt &N2) { 807 bool IsOverflow = false, IsSignedOverflow = false; 808 APInt N = IntFnSigned(IsSignedOverflow, N1, N2); 809 (void) IntFnUnsigned(IsOverflow, N1, N2); 810 if (!IsSignedOverflow && !IsOverflow) { 811 AllOverflow = false; 812 UR.account(N); 813 SR.account(N); 814 EXPECT_TRUE(CR.contains(N)); 815 } 816 }); 817 }); 818 819 EXPECT_EQ(CR.isEmptySet(), AllOverflow); 820 821 if (CR1.isWrappedSet() || CR2.isWrappedSet() || 822 CR1.isSignWrappedSet() || CR2.isSignWrappedSet()) 823 return; 824 825 ConstantRange ExactUnsignedCR = UR.getRange(); 826 ConstantRange ExactSignedCR = SR.getRange(); 827 828 if (ExactUnsignedCR.isEmptySet() || ExactSignedCR.isEmptySet()) { 829 EXPECT_TRUE(CR.isEmptySet()); 830 return; 831 } 832 833 ConstantRange Exact = ExactSignedCR.intersectWith(ExactUnsignedCR); 834 EXPECT_EQ(Exact, CR); 835 }); 836 } 837 838 TEST_F(ConstantRangeTest, AddWithNoWrap) { 839 typedef OverflowingBinaryOperator OBO; 840 EXPECT_EQ(Empty.addWithNoWrap(Some, OBO::NoSignedWrap), Empty); 841 EXPECT_EQ(Some.addWithNoWrap(Empty, OBO::NoSignedWrap), Empty); 842 EXPECT_EQ(Full.addWithNoWrap(Full, OBO::NoSignedWrap), Full); 843 EXPECT_NE(Full.addWithNoWrap(Some, OBO::NoSignedWrap), Full); 844 EXPECT_NE(Some.addWithNoWrap(Full, OBO::NoSignedWrap), Full); 845 EXPECT_EQ(Full.addWithNoWrap(ConstantRange(APInt(16, 1), APInt(16, 2)), 846 OBO::NoSignedWrap), 847 ConstantRange(APInt(16, INT16_MIN + 1), APInt(16, INT16_MIN))); 848 EXPECT_EQ(ConstantRange(APInt(16, 1), APInt(16, 2)) 849 .addWithNoWrap(Full, OBO::NoSignedWrap), 850 ConstantRange(APInt(16, INT16_MIN + 1), APInt(16, INT16_MIN))); 851 EXPECT_EQ(Full.addWithNoWrap(ConstantRange(APInt(16, -1), APInt(16, 0)), 852 OBO::NoSignedWrap), 853 ConstantRange(APInt(16, INT16_MIN), APInt(16, INT16_MAX))); 854 EXPECT_EQ(ConstantRange(APInt(8, 100), APInt(8, 120)) 855 .addWithNoWrap(ConstantRange(APInt(8, 120), APInt(8, 123)), 856 OBO::NoSignedWrap), 857 ConstantRange(8, false)); 858 EXPECT_EQ(ConstantRange(APInt(8, -120), APInt(8, -100)) 859 .addWithNoWrap(ConstantRange(APInt(8, -110), APInt(8, -100)), 860 OBO::NoSignedWrap), 861 ConstantRange(8, false)); 862 EXPECT_EQ(ConstantRange(APInt(8, 0), APInt(8, 101)) 863 .addWithNoWrap(ConstantRange(APInt(8, -128), APInt(8, 28)), 864 OBO::NoSignedWrap), 865 ConstantRange(8, true)); 866 EXPECT_EQ(ConstantRange(APInt(8, 0), APInt(8, 101)) 867 .addWithNoWrap(ConstantRange(APInt(8, -120), APInt(8, 29)), 868 OBO::NoSignedWrap), 869 ConstantRange(APInt(8, -120), APInt(8, -128))); 870 EXPECT_EQ(ConstantRange(APInt(8, -50), APInt(8, 50)) 871 .addWithNoWrap(ConstantRange(APInt(8, 10), APInt(8, 20)), 872 OBO::NoSignedWrap), 873 ConstantRange(APInt(8, -40), APInt(8, 69))); 874 EXPECT_EQ(ConstantRange(APInt(8, 10), APInt(8, 20)) 875 .addWithNoWrap(ConstantRange(APInt(8, -50), APInt(8, 50)), 876 OBO::NoSignedWrap), 877 ConstantRange(APInt(8, -40), APInt(8, 69))); 878 EXPECT_EQ(ConstantRange(APInt(8, 120), APInt(8, -10)) 879 .addWithNoWrap(ConstantRange(APInt(8, 5), APInt(8, 20)), 880 OBO::NoSignedWrap), 881 ConstantRange(APInt(8, 125), APInt(8, 9))); 882 EXPECT_EQ(ConstantRange(APInt(8, 5), APInt(8, 20)) 883 .addWithNoWrap(ConstantRange(APInt(8, 120), APInt(8, -10)), 884 OBO::NoSignedWrap), 885 ConstantRange(APInt(8, 125), APInt(8, 9))); 886 887 TestAddWithNoSignedWrapExhaustive( 888 [](const ConstantRange &CR1, const ConstantRange &CR2) { 889 return CR1.addWithNoWrap(CR2, OBO::NoSignedWrap); 890 }, 891 [](bool &IsOverflow, const APInt &N1, const APInt &N2) { 892 return N1.sadd_ov(N2, IsOverflow); 893 }); 894 895 EXPECT_EQ(Empty.addWithNoWrap(Some, OBO::NoUnsignedWrap), Empty); 896 EXPECT_EQ(Some.addWithNoWrap(Empty, OBO::NoUnsignedWrap), Empty); 897 EXPECT_EQ(Full.addWithNoWrap(Full, OBO::NoUnsignedWrap), Full); 898 EXPECT_NE(Full.addWithNoWrap(Some, OBO::NoUnsignedWrap), Full); 899 EXPECT_NE(Some.addWithNoWrap(Full, OBO::NoUnsignedWrap), Full); 900 EXPECT_EQ(Full.addWithNoWrap(ConstantRange(APInt(16, 1), APInt(16, 2)), 901 OBO::NoUnsignedWrap), 902 ConstantRange(APInt(16, 1), APInt(16, 0))); 903 EXPECT_EQ(ConstantRange(APInt(16, 1), APInt(16, 2)) 904 .addWithNoWrap(Full, OBO::NoUnsignedWrap), 905 ConstantRange(APInt(16, 1), APInt(16, 0))); 906 EXPECT_EQ(ConstantRange(APInt(8, 200), APInt(8, 220)) 907 .addWithNoWrap(ConstantRange(APInt(8, 100), APInt(8, 123)), 908 OBO::NoUnsignedWrap), 909 ConstantRange(8, false)); 910 EXPECT_EQ(ConstantRange(APInt(8, 0), APInt(8, 101)) 911 .addWithNoWrap(ConstantRange(APInt(8, 0), APInt(8, 156)), 912 OBO::NoUnsignedWrap), 913 ConstantRange(8, true)); 914 EXPECT_EQ(ConstantRange(APInt(8, 0), APInt(8, 101)) 915 .addWithNoWrap(ConstantRange(APInt(8, 10), APInt(8, 29)), 916 OBO::NoUnsignedWrap), 917 ConstantRange(APInt(8, 10), APInt(8, 129))); 918 EXPECT_EQ(ConstantRange(APInt(8, 20), APInt(8, 10)) 919 .addWithNoWrap(ConstantRange(APInt(8, 50), APInt(8, 200)), 920 OBO::NoUnsignedWrap), 921 ConstantRange(APInt(8, 50), APInt(8, 0))); 922 EXPECT_EQ(ConstantRange(APInt(8, 10), APInt(8, 20)) 923 .addWithNoWrap(ConstantRange(APInt(8, 50), APInt(8, 200)), 924 OBO::NoUnsignedWrap), 925 ConstantRange(APInt(8, 60), APInt(8, -37))); 926 EXPECT_EQ(ConstantRange(APInt(8, 20), APInt(8, -30)) 927 .addWithNoWrap(ConstantRange(APInt(8, 5), APInt(8, 20)), 928 OBO::NoUnsignedWrap), 929 ConstantRange(APInt(8, 25), APInt(8, -11))); 930 EXPECT_EQ(ConstantRange(APInt(8, 5), APInt(8, 20)) 931 .addWithNoWrap(ConstantRange(APInt(8, 20), APInt(8, -30)), 932 OBO::NoUnsignedWrap), 933 ConstantRange(APInt(8, 25), APInt(8, -11))); 934 935 TestAddWithNoUnsignedWrapExhaustive( 936 [](const ConstantRange &CR1, const ConstantRange &CR2) { 937 return CR1.addWithNoWrap(CR2, OBO::NoUnsignedWrap); 938 }, 939 [](bool &IsOverflow, const APInt &N1, const APInt &N2) { 940 return N1.uadd_ov(N2, IsOverflow); 941 }); 942 943 EXPECT_EQ(ConstantRange(APInt(8, 50), APInt(8, 100)) 944 .addWithNoWrap(ConstantRange(APInt(8, 20), APInt(8, 70)), 945 OBO::NoSignedWrap), 946 ConstantRange(APInt(8, 70), APInt(8, -128))); 947 EXPECT_EQ(ConstantRange(APInt(8, 50), APInt(8, 100)) 948 .addWithNoWrap(ConstantRange(APInt(8, 20), APInt(8, 70)), 949 OBO::NoUnsignedWrap), 950 ConstantRange(APInt(8, 70), APInt(8, 169))); 951 EXPECT_EQ(ConstantRange(APInt(8, 50), APInt(8, 100)) 952 .addWithNoWrap(ConstantRange(APInt(8, 20), APInt(8, 70)), 953 OBO::NoUnsignedWrap | OBO::NoSignedWrap), 954 ConstantRange(APInt(8, 70), APInt(8, -128))); 955 956 EXPECT_EQ(ConstantRange(APInt(8, -100), APInt(8, -50)) 957 .addWithNoWrap(ConstantRange(APInt(8, 20), APInt(8, 30)), 958 OBO::NoSignedWrap), 959 ConstantRange(APInt(8, -80), APInt(8, -21))); 960 EXPECT_EQ(ConstantRange(APInt(8, -100), APInt(8, -50)) 961 .addWithNoWrap(ConstantRange(APInt(8, 20), APInt(8, 30)), 962 OBO::NoUnsignedWrap), 963 ConstantRange(APInt(8, 176), APInt(8, 235))); 964 EXPECT_EQ(ConstantRange(APInt(8, -100), APInt(8, -50)) 965 .addWithNoWrap(ConstantRange(APInt(8, 20), APInt(8, 30)), 966 OBO::NoUnsignedWrap | OBO::NoSignedWrap), 967 ConstantRange(APInt(8, 176), APInt(8, 235))); 968 969 TestAddWithNoSignedUnsignedWrapExhaustive( 970 [](const ConstantRange &CR1, const ConstantRange &CR2) { 971 return CR1.addWithNoWrap(CR2, OBO::NoUnsignedWrap | OBO::NoSignedWrap); 972 }, 973 [](bool &IsOverflow, const APInt &N1, const APInt &N2) { 974 return N1.sadd_ov(N2, IsOverflow); 975 }, 976 [](bool &IsOverflow, const APInt &N1, const APInt &N2) { 977 return N1.uadd_ov(N2, IsOverflow); 978 }); 979 } 980 981 TEST_F(ConstantRangeTest, Sub) { 982 EXPECT_EQ(Full.sub(APInt(16, 4)), Full); 983 EXPECT_EQ(Full.sub(Full), Full); 984 EXPECT_EQ(Full.sub(Empty), Empty); 985 EXPECT_EQ(Full.sub(One), Full); 986 EXPECT_EQ(Full.sub(Some), Full); 987 EXPECT_EQ(Full.sub(Wrap), Full); 988 EXPECT_EQ(Empty.sub(Empty), Empty); 989 EXPECT_EQ(Empty.sub(One), Empty); 990 EXPECT_EQ(Empty.sub(Some), Empty); 991 EXPECT_EQ(Empty.sub(Wrap), Empty); 992 EXPECT_EQ(Empty.sub(APInt(16, 4)), Empty); 993 EXPECT_EQ(Some.sub(APInt(16, 4)), 994 ConstantRange(APInt(16, 0x6), APInt(16, 0xaa6))); 995 EXPECT_EQ(Some.sub(Some), 996 ConstantRange(APInt(16, 0xf561), APInt(16, 0xaa0))); 997 EXPECT_EQ(Wrap.sub(APInt(16, 4)), 998 ConstantRange(APInt(16, 0xaa6), APInt(16, 0x6))); 999 EXPECT_EQ(One.sub(APInt(16, 4)), 1000 ConstantRange(APInt(16, 0x6))); 1001 1002 TestBinaryOpExhaustive( 1003 [](const ConstantRange &CR1, const ConstantRange &CR2) { 1004 return CR1.sub(CR2); 1005 }, 1006 [](const APInt &N1, const APInt &N2) { 1007 return N1 - N2; 1008 }); 1009 } 1010 1011 TEST_F(ConstantRangeTest, SubWithNoWrap) { 1012 typedef OverflowingBinaryOperator OBO; 1013 TestAddWithNoSignedWrapExhaustive( 1014 [](const ConstantRange &CR1, const ConstantRange &CR2) { 1015 return CR1.subWithNoWrap(CR2, OBO::NoSignedWrap); 1016 }, 1017 [](bool &IsOverflow, const APInt &N1, const APInt &N2) { 1018 return N1.ssub_ov(N2, IsOverflow); 1019 }); 1020 TestAddWithNoUnsignedWrapExhaustive( 1021 [](const ConstantRange &CR1, const ConstantRange &CR2) { 1022 return CR1.subWithNoWrap(CR2, OBO::NoUnsignedWrap); 1023 }, 1024 [](bool &IsOverflow, const APInt &N1, const APInt &N2) { 1025 return N1.usub_ov(N2, IsOverflow); 1026 }); 1027 TestAddWithNoSignedUnsignedWrapExhaustive( 1028 [](const ConstantRange &CR1, const ConstantRange &CR2) { 1029 return CR1.subWithNoWrap(CR2, OBO::NoUnsignedWrap | OBO::NoSignedWrap); 1030 }, 1031 [](bool &IsOverflow, const APInt &N1, const APInt &N2) { 1032 return N1.ssub_ov(N2, IsOverflow); 1033 }, 1034 [](bool &IsOverflow, const APInt &N1, const APInt &N2) { 1035 return N1.usub_ov(N2, IsOverflow); 1036 }); 1037 } 1038 1039 TEST_F(ConstantRangeTest, Multiply) { 1040 EXPECT_EQ(Full.multiply(Full), Full); 1041 EXPECT_EQ(Full.multiply(Empty), Empty); 1042 EXPECT_EQ(Full.multiply(One), Full); 1043 EXPECT_EQ(Full.multiply(Some), Full); 1044 EXPECT_EQ(Full.multiply(Wrap), Full); 1045 EXPECT_EQ(Empty.multiply(Empty), Empty); 1046 EXPECT_EQ(Empty.multiply(One), Empty); 1047 EXPECT_EQ(Empty.multiply(Some), Empty); 1048 EXPECT_EQ(Empty.multiply(Wrap), Empty); 1049 EXPECT_EQ(One.multiply(One), ConstantRange(APInt(16, 0xa*0xa), 1050 APInt(16, 0xa*0xa + 1))); 1051 EXPECT_EQ(One.multiply(Some), ConstantRange(APInt(16, 0xa*0xa), 1052 APInt(16, 0xa*0xaa9 + 1))); 1053 EXPECT_EQ(One.multiply(Wrap), Full); 1054 EXPECT_EQ(Some.multiply(Some), Full); 1055 EXPECT_EQ(Some.multiply(Wrap), Full); 1056 EXPECT_EQ(Wrap.multiply(Wrap), Full); 1057 1058 ConstantRange Zero(APInt(16, 0)); 1059 EXPECT_EQ(Zero.multiply(Full), Zero); 1060 EXPECT_EQ(Zero.multiply(Some), Zero); 1061 EXPECT_EQ(Zero.multiply(Wrap), Zero); 1062 EXPECT_EQ(Full.multiply(Zero), Zero); 1063 EXPECT_EQ(Some.multiply(Zero), Zero); 1064 EXPECT_EQ(Wrap.multiply(Zero), Zero); 1065 1066 // http://llvm.org/PR4545 1067 EXPECT_EQ(ConstantRange(APInt(4, 1), APInt(4, 6)).multiply( 1068 ConstantRange(APInt(4, 6), APInt(4, 2))), 1069 ConstantRange(4, /*isFullSet=*/true)); 1070 1071 EXPECT_EQ(ConstantRange(APInt(8, 254), APInt(8, 0)).multiply( 1072 ConstantRange(APInt(8, 252), APInt(8, 4))), 1073 ConstantRange(APInt(8, 250), APInt(8, 9))); 1074 EXPECT_EQ(ConstantRange(APInt(8, 254), APInt(8, 255)).multiply( 1075 ConstantRange(APInt(8, 2), APInt(8, 4))), 1076 ConstantRange(APInt(8, 250), APInt(8, 253))); 1077 1078 // TODO: This should be return [-2, 0] 1079 EXPECT_EQ(ConstantRange(APInt(8, -2)).multiply( 1080 ConstantRange(APInt(8, 0), APInt(8, 2))), 1081 ConstantRange(APInt(8, -2), APInt(8, 1))); 1082 } 1083 1084 TEST_F(ConstantRangeTest, smul_fast) { 1085 TestBinaryOpExhaustive( 1086 [](const ConstantRange &CR1, const ConstantRange &CR2) { 1087 return CR1.smul_fast(CR2); 1088 }, 1089 [](const APInt &N1, const APInt &N2) { 1090 return N1 * N2; 1091 }, 1092 PreferSmallest, 1093 [](const ConstantRange &, const ConstantRange &) { 1094 return false; // Check correctness only. 1095 }); 1096 } 1097 1098 TEST_F(ConstantRangeTest, UMax) { 1099 EXPECT_EQ(Full.umax(Full), Full); 1100 EXPECT_EQ(Full.umax(Empty), Empty); 1101 EXPECT_EQ(Full.umax(Some), ConstantRange(APInt(16, 0xa), APInt(16, 0))); 1102 EXPECT_EQ(Full.umax(Wrap), Full); 1103 EXPECT_EQ(Full.umax(Some), ConstantRange(APInt(16, 0xa), APInt(16, 0))); 1104 EXPECT_EQ(Empty.umax(Empty), Empty); 1105 EXPECT_EQ(Empty.umax(Some), Empty); 1106 EXPECT_EQ(Empty.umax(Wrap), Empty); 1107 EXPECT_EQ(Empty.umax(One), Empty); 1108 EXPECT_EQ(Some.umax(Some), Some); 1109 EXPECT_EQ(Some.umax(Wrap), ConstantRange(APInt(16, 0xa), APInt(16, 0))); 1110 EXPECT_EQ(Some.umax(One), Some); 1111 EXPECT_EQ(Wrap.umax(Wrap), Wrap); 1112 EXPECT_EQ(Wrap.umax(One), ConstantRange(APInt(16, 0xa), APInt(16, 0))); 1113 EXPECT_EQ(One.umax(One), One); 1114 1115 TestBinaryOpExhaustive( 1116 [](const ConstantRange &CR1, const ConstantRange &CR2) { 1117 return CR1.umax(CR2); 1118 }, 1119 [](const APInt &N1, const APInt &N2) { 1120 return APIntOps::umax(N1, N2); 1121 }, 1122 PreferSmallestNonFullUnsigned); 1123 } 1124 1125 TEST_F(ConstantRangeTest, SMax) { 1126 EXPECT_EQ(Full.smax(Full), Full); 1127 EXPECT_EQ(Full.smax(Empty), Empty); 1128 EXPECT_EQ(Full.smax(Some), ConstantRange(APInt(16, 0xa), 1129 APInt::getSignedMinValue(16))); 1130 EXPECT_EQ(Full.smax(Wrap), Full); 1131 EXPECT_EQ(Full.smax(One), ConstantRange(APInt(16, 0xa), 1132 APInt::getSignedMinValue(16))); 1133 EXPECT_EQ(Empty.smax(Empty), Empty); 1134 EXPECT_EQ(Empty.smax(Some), Empty); 1135 EXPECT_EQ(Empty.smax(Wrap), Empty); 1136 EXPECT_EQ(Empty.smax(One), Empty); 1137 EXPECT_EQ(Some.smax(Some), Some); 1138 EXPECT_EQ(Some.smax(Wrap), ConstantRange(APInt(16, 0xa), 1139 APInt(16, (uint64_t)INT16_MIN))); 1140 EXPECT_EQ(Some.smax(One), Some); 1141 EXPECT_EQ(Wrap.smax(One), ConstantRange(APInt(16, 0xa), 1142 APInt(16, (uint64_t)INT16_MIN))); 1143 EXPECT_EQ(One.smax(One), One); 1144 1145 TestBinaryOpExhaustive( 1146 [](const ConstantRange &CR1, const ConstantRange &CR2) { 1147 return CR1.smax(CR2); 1148 }, 1149 [](const APInt &N1, const APInt &N2) { 1150 return APIntOps::smax(N1, N2); 1151 }, 1152 PreferSmallestNonFullSigned); 1153 } 1154 1155 TEST_F(ConstantRangeTest, UMin) { 1156 EXPECT_EQ(Full.umin(Full), Full); 1157 EXPECT_EQ(Full.umin(Empty), Empty); 1158 EXPECT_EQ(Full.umin(Some), ConstantRange(APInt(16, 0), APInt(16, 0xaaa))); 1159 EXPECT_EQ(Full.umin(Wrap), Full); 1160 EXPECT_EQ(Empty.umin(Empty), Empty); 1161 EXPECT_EQ(Empty.umin(Some), Empty); 1162 EXPECT_EQ(Empty.umin(Wrap), Empty); 1163 EXPECT_EQ(Empty.umin(One), Empty); 1164 EXPECT_EQ(Some.umin(Some), Some); 1165 EXPECT_EQ(Some.umin(Wrap), ConstantRange(APInt(16, 0), APInt(16, 0xaaa))); 1166 EXPECT_EQ(Some.umin(One), One); 1167 EXPECT_EQ(Wrap.umin(Wrap), Wrap); 1168 EXPECT_EQ(Wrap.umin(One), ConstantRange(APInt(16, 0), APInt(16, 0xb))); 1169 EXPECT_EQ(One.umin(One), One); 1170 1171 TestBinaryOpExhaustive( 1172 [](const ConstantRange &CR1, const ConstantRange &CR2) { 1173 return CR1.umin(CR2); 1174 }, 1175 [](const APInt &N1, const APInt &N2) { 1176 return APIntOps::umin(N1, N2); 1177 }, 1178 PreferSmallestNonFullUnsigned); 1179 } 1180 1181 TEST_F(ConstantRangeTest, SMin) { 1182 EXPECT_EQ(Full.smin(Full), Full); 1183 EXPECT_EQ(Full.smin(Empty), Empty); 1184 EXPECT_EQ(Full.smin(Some), ConstantRange(APInt(16, (uint64_t)INT16_MIN), 1185 APInt(16, 0xaaa))); 1186 EXPECT_EQ(Full.smin(Wrap), Full); 1187 EXPECT_EQ(Empty.smin(Empty), Empty); 1188 EXPECT_EQ(Empty.smin(Some), Empty); 1189 EXPECT_EQ(Empty.smin(Wrap), Empty); 1190 EXPECT_EQ(Empty.smin(One), Empty); 1191 EXPECT_EQ(Some.smin(Some), Some); 1192 EXPECT_EQ(Some.smin(Wrap), ConstantRange(APInt(16, (uint64_t)INT16_MIN), 1193 APInt(16, 0xaaa))); 1194 EXPECT_EQ(Some.smin(One), One); 1195 EXPECT_EQ(Wrap.smin(Wrap), Wrap); 1196 EXPECT_EQ(Wrap.smin(One), ConstantRange(APInt(16, (uint64_t)INT16_MIN), 1197 APInt(16, 0xb))); 1198 EXPECT_EQ(One.smin(One), One); 1199 1200 TestBinaryOpExhaustive( 1201 [](const ConstantRange &CR1, const ConstantRange &CR2) { 1202 return CR1.smin(CR2); 1203 }, 1204 [](const APInt &N1, const APInt &N2) { 1205 return APIntOps::smin(N1, N2); 1206 }, 1207 PreferSmallestNonFullSigned); 1208 } 1209 1210 TEST_F(ConstantRangeTest, UDiv) { 1211 EXPECT_EQ(Full.udiv(Full), Full); 1212 EXPECT_EQ(Full.udiv(Empty), Empty); 1213 EXPECT_EQ(Full.udiv(One), ConstantRange(APInt(16, 0), 1214 APInt(16, 0xffff / 0xa + 1))); 1215 EXPECT_EQ(Full.udiv(Some), ConstantRange(APInt(16, 0), 1216 APInt(16, 0xffff / 0xa + 1))); 1217 EXPECT_EQ(Full.udiv(Wrap), Full); 1218 EXPECT_EQ(Empty.udiv(Empty), Empty); 1219 EXPECT_EQ(Empty.udiv(One), Empty); 1220 EXPECT_EQ(Empty.udiv(Some), Empty); 1221 EXPECT_EQ(Empty.udiv(Wrap), Empty); 1222 EXPECT_EQ(One.udiv(One), ConstantRange(APInt(16, 1))); 1223 EXPECT_EQ(One.udiv(Some), ConstantRange(APInt(16, 0), APInt(16, 2))); 1224 EXPECT_EQ(One.udiv(Wrap), ConstantRange(APInt(16, 0), APInt(16, 0xb))); 1225 EXPECT_EQ(Some.udiv(Some), ConstantRange(APInt(16, 0), APInt(16, 0x111))); 1226 EXPECT_EQ(Some.udiv(Wrap), ConstantRange(APInt(16, 0), APInt(16, 0xaaa))); 1227 EXPECT_EQ(Wrap.udiv(Wrap), Full); 1228 1229 1230 ConstantRange Zero(APInt(16, 0)); 1231 EXPECT_EQ(Zero.udiv(One), Zero); 1232 EXPECT_EQ(Zero.udiv(Full), Zero); 1233 1234 EXPECT_EQ(ConstantRange(APInt(16, 0), APInt(16, 99)).udiv(Full), 1235 ConstantRange(APInt(16, 0), APInt(16, 99))); 1236 EXPECT_EQ(ConstantRange(APInt(16, 10), APInt(16, 99)).udiv(Full), 1237 ConstantRange(APInt(16, 0), APInt(16, 99))); 1238 } 1239 1240 TEST_F(ConstantRangeTest, SDiv) { 1241 unsigned Bits = 4; 1242 EnumerateTwoConstantRanges(Bits, [&](const ConstantRange &CR1, 1243 const ConstantRange &CR2) { 1244 // Collect possible results in a bit vector. We store the signed value plus 1245 // a bias to make it unsigned. 1246 int Bias = 1 << (Bits - 1); 1247 BitVector Results(1 << Bits); 1248 ForeachNumInConstantRange(CR1, [&](const APInt &N1) { 1249 ForeachNumInConstantRange(CR2, [&](const APInt &N2) { 1250 // Division by zero is UB. 1251 if (N2 == 0) 1252 return; 1253 1254 // SignedMin / -1 is UB. 1255 if (N1.isMinSignedValue() && N2.isAllOnes()) 1256 return; 1257 1258 APInt N = N1.sdiv(N2); 1259 Results.set(N.getSExtValue() + Bias); 1260 }); 1261 }); 1262 1263 ConstantRange CR = CR1.sdiv(CR2); 1264 if (Results.none()) { 1265 EXPECT_TRUE(CR.isEmptySet()); 1266 return; 1267 } 1268 1269 // If there is a non-full signed envelope, that should be the result. 1270 APInt SMin(Bits, Results.find_first() - Bias); 1271 APInt SMax(Bits, Results.find_last() - Bias); 1272 ConstantRange Envelope = ConstantRange::getNonEmpty(SMin, SMax + 1); 1273 if (!Envelope.isFullSet()) { 1274 EXPECT_EQ(Envelope, CR); 1275 return; 1276 } 1277 1278 // If the signed envelope is a full set, try to find a smaller sign wrapped 1279 // set that is separated in negative and positive components (or one which 1280 // can also additionally contain zero). 1281 int LastNeg = Results.find_last_in(0, Bias) - Bias; 1282 int LastPos = Results.find_next(Bias) - Bias; 1283 if (Results[Bias]) { 1284 if (LastNeg == -1) 1285 ++LastNeg; 1286 else if (LastPos == 1) 1287 --LastPos; 1288 } 1289 1290 APInt WMax(Bits, LastNeg); 1291 APInt WMin(Bits, LastPos); 1292 ConstantRange Wrapped = ConstantRange::getNonEmpty(WMin, WMax + 1); 1293 EXPECT_EQ(Wrapped, CR); 1294 }); 1295 } 1296 1297 TEST_F(ConstantRangeTest, URem) { 1298 EXPECT_EQ(Full.urem(Empty), Empty); 1299 EXPECT_EQ(Empty.urem(Full), Empty); 1300 // urem by zero is poison. 1301 EXPECT_EQ(Full.urem(ConstantRange(APInt(16, 0))), Empty); 1302 // urem by full range doesn't contain MaxValue. 1303 EXPECT_EQ(Full.urem(Full), ConstantRange(APInt(16, 0), APInt(16, 0xffff))); 1304 // urem is upper bounded by maximum RHS minus one. 1305 EXPECT_EQ(Full.urem(ConstantRange(APInt(16, 0), APInt(16, 123))), 1306 ConstantRange(APInt(16, 0), APInt(16, 122))); 1307 // urem is upper bounded by maximum LHS. 1308 EXPECT_EQ(ConstantRange(APInt(16, 0), APInt(16, 123)).urem(Full), 1309 ConstantRange(APInt(16, 0), APInt(16, 123))); 1310 // If the LHS is always lower than the RHS, the result is the LHS. 1311 EXPECT_EQ(ConstantRange(APInt(16, 10), APInt(16, 20)) 1312 .urem(ConstantRange(APInt(16, 20), APInt(16, 30))), 1313 ConstantRange(APInt(16, 10), APInt(16, 20))); 1314 // It has to be strictly lower, otherwise the top value may wrap to zero. 1315 EXPECT_EQ(ConstantRange(APInt(16, 10), APInt(16, 20)) 1316 .urem(ConstantRange(APInt(16, 19), APInt(16, 30))), 1317 ConstantRange(APInt(16, 0), APInt(16, 20))); 1318 // [12, 14] % 10 is [2, 4], but we conservatively compute [0, 9]. 1319 EXPECT_EQ(ConstantRange(APInt(16, 12), APInt(16, 15)) 1320 .urem(ConstantRange(APInt(16, 10))), 1321 ConstantRange(APInt(16, 0), APInt(16, 10))); 1322 1323 TestBinaryOpExhaustive( 1324 [](const ConstantRange &CR1, const ConstantRange &CR2) { 1325 return CR1.urem(CR2); 1326 }, 1327 [](const APInt &N1, const APInt &N2) -> Optional<APInt> { 1328 if (N2.isZero()) 1329 return None; 1330 return N1.urem(N2); 1331 }, 1332 PreferSmallest, 1333 CheckSingleElementsOnly); 1334 } 1335 1336 TEST_F(ConstantRangeTest, SRem) { 1337 EXPECT_EQ(Full.srem(Empty), Empty); 1338 EXPECT_EQ(Empty.srem(Full), Empty); 1339 // srem by zero is UB. 1340 EXPECT_EQ(Full.srem(ConstantRange(APInt(16, 0))), Empty); 1341 // srem by full range doesn't contain SignedMinValue. 1342 EXPECT_EQ(Full.srem(Full), ConstantRange(APInt::getSignedMinValue(16) + 1, 1343 APInt::getSignedMinValue(16))); 1344 1345 ConstantRange PosMod(APInt(16, 10), APInt(16, 21)); // [10, 20] 1346 ConstantRange NegMod(APInt(16, -20), APInt(16, -9)); // [-20, -10] 1347 ConstantRange IntMinMod(APInt::getSignedMinValue(16)); 1348 1349 ConstantRange Expected(16, true); 1350 1351 // srem is bounded by abs(RHS) minus one. 1352 ConstantRange PosLargeLHS(APInt(16, 0), APInt(16, 41)); 1353 Expected = ConstantRange(APInt(16, 0), APInt(16, 20)); 1354 EXPECT_EQ(PosLargeLHS.srem(PosMod), Expected); 1355 EXPECT_EQ(PosLargeLHS.srem(NegMod), Expected); 1356 ConstantRange NegLargeLHS(APInt(16, -40), APInt(16, 1)); 1357 Expected = ConstantRange(APInt(16, -19), APInt(16, 1)); 1358 EXPECT_EQ(NegLargeLHS.srem(PosMod), Expected); 1359 EXPECT_EQ(NegLargeLHS.srem(NegMod), Expected); 1360 ConstantRange PosNegLargeLHS(APInt(16, -32), APInt(16, 38)); 1361 Expected = ConstantRange(APInt(16, -19), APInt(16, 20)); 1362 EXPECT_EQ(PosNegLargeLHS.srem(PosMod), Expected); 1363 EXPECT_EQ(PosNegLargeLHS.srem(NegMod), Expected); 1364 1365 // srem is bounded by LHS. 1366 ConstantRange PosLHS(APInt(16, 0), APInt(16, 16)); 1367 EXPECT_EQ(PosLHS.srem(PosMod), PosLHS); 1368 EXPECT_EQ(PosLHS.srem(NegMod), PosLHS); 1369 EXPECT_EQ(PosLHS.srem(IntMinMod), PosLHS); 1370 ConstantRange NegLHS(APInt(16, -15), APInt(16, 1)); 1371 EXPECT_EQ(NegLHS.srem(PosMod), NegLHS); 1372 EXPECT_EQ(NegLHS.srem(NegMod), NegLHS); 1373 EXPECT_EQ(NegLHS.srem(IntMinMod), NegLHS); 1374 ConstantRange PosNegLHS(APInt(16, -12), APInt(16, 18)); 1375 EXPECT_EQ(PosNegLHS.srem(PosMod), PosNegLHS); 1376 EXPECT_EQ(PosNegLHS.srem(NegMod), PosNegLHS); 1377 EXPECT_EQ(PosNegLHS.srem(IntMinMod), PosNegLHS); 1378 1379 // srem is LHS if it is smaller than RHS. 1380 ConstantRange PosSmallLHS(APInt(16, 3), APInt(16, 8)); 1381 EXPECT_EQ(PosSmallLHS.srem(PosMod), PosSmallLHS); 1382 EXPECT_EQ(PosSmallLHS.srem(NegMod), PosSmallLHS); 1383 EXPECT_EQ(PosSmallLHS.srem(IntMinMod), PosSmallLHS); 1384 ConstantRange NegSmallLHS(APInt(16, -7), APInt(16, -2)); 1385 EXPECT_EQ(NegSmallLHS.srem(PosMod), NegSmallLHS); 1386 EXPECT_EQ(NegSmallLHS.srem(NegMod), NegSmallLHS); 1387 EXPECT_EQ(NegSmallLHS.srem(IntMinMod), NegSmallLHS); 1388 ConstantRange PosNegSmallLHS(APInt(16, -3), APInt(16, 8)); 1389 EXPECT_EQ(PosNegSmallLHS.srem(PosMod), PosNegSmallLHS); 1390 EXPECT_EQ(PosNegSmallLHS.srem(NegMod), PosNegSmallLHS); 1391 EXPECT_EQ(PosNegSmallLHS.srem(IntMinMod), PosNegSmallLHS); 1392 1393 // Example of a suboptimal result: 1394 // [12, 14] srem 10 is [2, 4], but we conservatively compute [0, 9]. 1395 EXPECT_EQ(ConstantRange(APInt(16, 12), APInt(16, 15)) 1396 .srem(ConstantRange(APInt(16, 10))), 1397 ConstantRange(APInt(16, 0), APInt(16, 10))); 1398 1399 TestBinaryOpExhaustive( 1400 [](const ConstantRange &CR1, const ConstantRange &CR2) { 1401 return CR1.srem(CR2); 1402 }, 1403 [](const APInt &N1, const APInt &N2) -> Optional<APInt> { 1404 if (N2.isZero()) 1405 return None; 1406 return N1.srem(N2); 1407 }, 1408 PreferSmallest, 1409 CheckSingleElementsOnly); 1410 } 1411 1412 TEST_F(ConstantRangeTest, Shl) { 1413 ConstantRange Some2(APInt(16, 0xfff), APInt(16, 0x8000)); 1414 ConstantRange WrapNullMax(APInt(16, 0x1), APInt(16, 0x0)); 1415 EXPECT_EQ(Full.shl(Full), Full); 1416 EXPECT_EQ(Full.shl(Empty), Empty); 1417 EXPECT_EQ(Full.shl(One), ConstantRange(APInt(16, 0), 1418 APInt(16, 0xfc00) + 1)); 1419 EXPECT_EQ(Full.shl(Some), Full); // TODO: [0, (-1 << 0xa) + 1) 1420 EXPECT_EQ(Full.shl(Wrap), Full); 1421 EXPECT_EQ(Empty.shl(Empty), Empty); 1422 EXPECT_EQ(Empty.shl(One), Empty); 1423 EXPECT_EQ(Empty.shl(Some), Empty); 1424 EXPECT_EQ(Empty.shl(Wrap), Empty); 1425 EXPECT_EQ(One.shl(One), ConstantRange(APInt(16, 0xa << 0xa), 1426 APInt(16, (0xa << 0xa) + 1))); 1427 EXPECT_EQ(One.shl(Some), Full); // TODO: [0xa << 0xa, 0) 1428 EXPECT_EQ(One.shl(Wrap), Full); // TODO: [0xa, 0xa << 14 + 1) 1429 EXPECT_EQ(Some.shl(Some), Full); // TODO: [0xa << 0xa, 0xfc01) 1430 EXPECT_EQ(Some.shl(Wrap), Full); // TODO: [0xa, 0x7ff << 0x5 + 1) 1431 EXPECT_EQ(Wrap.shl(Wrap), Full); 1432 EXPECT_EQ( 1433 Some2.shl(ConstantRange(APInt(16, 0x1))), 1434 ConstantRange(APInt(16, 0xfff << 0x1), APInt(16, 0x7fff << 0x1) + 1)); 1435 EXPECT_EQ(One.shl(WrapNullMax), Full); 1436 1437 TestBinaryOpExhaustive( 1438 [](const ConstantRange &CR1, const ConstantRange &CR2) { 1439 return CR1.shl(CR2); 1440 }, 1441 [](const APInt &N1, const APInt &N2) -> Optional<APInt> { 1442 if (N2.uge(N2.getBitWidth())) 1443 return None; 1444 return N1.shl(N2); 1445 }, 1446 PreferSmallestUnsigned, 1447 [](const ConstantRange &, const ConstantRange &CR2) { 1448 // We currently only produce precise results for single element RHS. 1449 return CR2.isSingleElement(); 1450 }); 1451 } 1452 1453 TEST_F(ConstantRangeTest, Lshr) { 1454 EXPECT_EQ(Full.lshr(Full), Full); 1455 EXPECT_EQ(Full.lshr(Empty), Empty); 1456 EXPECT_EQ(Full.lshr(One), ConstantRange(APInt(16, 0), 1457 APInt(16, (0xffff >> 0xa) + 1))); 1458 EXPECT_EQ(Full.lshr(Some), ConstantRange(APInt(16, 0), 1459 APInt(16, (0xffff >> 0xa) + 1))); 1460 EXPECT_EQ(Full.lshr(Wrap), Full); 1461 EXPECT_EQ(Empty.lshr(Empty), Empty); 1462 EXPECT_EQ(Empty.lshr(One), Empty); 1463 EXPECT_EQ(Empty.lshr(Some), Empty); 1464 EXPECT_EQ(Empty.lshr(Wrap), Empty); 1465 EXPECT_EQ(One.lshr(One), ConstantRange(APInt(16, 0))); 1466 EXPECT_EQ(One.lshr(Some), ConstantRange(APInt(16, 0))); 1467 EXPECT_EQ(One.lshr(Wrap), ConstantRange(APInt(16, 0), APInt(16, 0xb))); 1468 EXPECT_EQ(Some.lshr(Some), ConstantRange(APInt(16, 0), 1469 APInt(16, (0xaaa >> 0xa) + 1))); 1470 EXPECT_EQ(Some.lshr(Wrap), ConstantRange(APInt(16, 0), APInt(16, 0xaaa))); 1471 EXPECT_EQ(Wrap.lshr(Wrap), Full); 1472 } 1473 1474 TEST_F(ConstantRangeTest, Ashr) { 1475 EXPECT_EQ(Full.ashr(Full), Full); 1476 EXPECT_EQ(Full.ashr(Empty), Empty); 1477 EXPECT_EQ(Full.ashr(One), ConstantRange(APInt(16, 0xffe0), 1478 APInt(16, (0x7fff >> 0xa) + 1 ))); 1479 ConstantRange Small(APInt(16, 0xa), APInt(16, 0xb)); 1480 EXPECT_EQ(Full.ashr(Small), ConstantRange(APInt(16, 0xffe0), 1481 APInt(16, (0x7fff >> 0xa) + 1 ))); 1482 EXPECT_EQ(Full.ashr(Some), ConstantRange(APInt(16, 0xffe0), 1483 APInt(16, (0x7fff >> 0xa) + 1 ))); 1484 EXPECT_EQ(Full.ashr(Wrap), Full); 1485 EXPECT_EQ(Empty.ashr(Empty), Empty); 1486 EXPECT_EQ(Empty.ashr(One), Empty); 1487 EXPECT_EQ(Empty.ashr(Some), Empty); 1488 EXPECT_EQ(Empty.ashr(Wrap), Empty); 1489 EXPECT_EQ(One.ashr(One), ConstantRange(APInt(16, 0))); 1490 EXPECT_EQ(One.ashr(Some), ConstantRange(APInt(16, 0))); 1491 EXPECT_EQ(One.ashr(Wrap), ConstantRange(APInt(16, 0), APInt(16, 0xb))); 1492 EXPECT_EQ(Some.ashr(Some), ConstantRange(APInt(16, 0), 1493 APInt(16, (0xaaa >> 0xa) + 1))); 1494 EXPECT_EQ(Some.ashr(Wrap), ConstantRange(APInt(16, 0), APInt(16, 0xaaa))); 1495 EXPECT_EQ(Wrap.ashr(Wrap), Full); 1496 ConstantRange Neg(APInt(16, 0xf3f0, true), APInt(16, 0xf7f8, true)); 1497 EXPECT_EQ(Neg.ashr(Small), ConstantRange(APInt(16, 0xfffc, true), 1498 APInt(16, 0xfffe, true))); 1499 } 1500 1501 TEST(ConstantRange, MakeAllowedICmpRegion) { 1502 // PR8250 1503 ConstantRange SMax = ConstantRange(APInt::getSignedMaxValue(32)); 1504 EXPECT_TRUE(ConstantRange::makeAllowedICmpRegion(ICmpInst::ICMP_SGT, SMax) 1505 .isEmptySet()); 1506 } 1507 1508 TEST(ConstantRange, MakeSatisfyingICmpRegion) { 1509 ConstantRange LowHalf(APInt(8, 0), APInt(8, 128)); 1510 ConstantRange HighHalf(APInt(8, 128), APInt(8, 0)); 1511 ConstantRange EmptySet(8, /* isFullSet = */ false); 1512 1513 EXPECT_EQ(ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_NE, LowHalf), 1514 HighHalf); 1515 1516 EXPECT_EQ( 1517 ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_NE, HighHalf), 1518 LowHalf); 1519 1520 EXPECT_TRUE(ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_EQ, 1521 HighHalf).isEmptySet()); 1522 1523 ConstantRange UnsignedSample(APInt(8, 5), APInt(8, 200)); 1524 1525 EXPECT_EQ(ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_ULT, 1526 UnsignedSample), 1527 ConstantRange(APInt(8, 0), APInt(8, 5))); 1528 1529 EXPECT_EQ(ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_ULE, 1530 UnsignedSample), 1531 ConstantRange(APInt(8, 0), APInt(8, 6))); 1532 1533 EXPECT_EQ(ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_UGT, 1534 UnsignedSample), 1535 ConstantRange(APInt(8, 200), APInt(8, 0))); 1536 1537 EXPECT_EQ(ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_UGE, 1538 UnsignedSample), 1539 ConstantRange(APInt(8, 199), APInt(8, 0))); 1540 1541 ConstantRange SignedSample(APInt(8, -5), APInt(8, 5)); 1542 1543 EXPECT_EQ( 1544 ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_SLT, SignedSample), 1545 ConstantRange(APInt(8, -128), APInt(8, -5))); 1546 1547 EXPECT_EQ( 1548 ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_SLE, SignedSample), 1549 ConstantRange(APInt(8, -128), APInt(8, -4))); 1550 1551 EXPECT_EQ( 1552 ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_SGT, SignedSample), 1553 ConstantRange(APInt(8, 5), APInt(8, -128))); 1554 1555 EXPECT_EQ( 1556 ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_SGE, SignedSample), 1557 ConstantRange(APInt(8, 4), APInt(8, -128))); 1558 } 1559 1560 static bool icmp(CmpInst::Predicate Pred, const APInt &LHS, const APInt &RHS) { 1561 switch (Pred) { 1562 case CmpInst::Predicate::ICMP_EQ: 1563 return LHS.eq(RHS); 1564 case CmpInst::Predicate::ICMP_NE: 1565 return LHS.ne(RHS); 1566 case CmpInst::Predicate::ICMP_UGT: 1567 return LHS.ugt(RHS); 1568 case CmpInst::Predicate::ICMP_UGE: 1569 return LHS.uge(RHS); 1570 case CmpInst::Predicate::ICMP_ULT: 1571 return LHS.ult(RHS); 1572 case CmpInst::Predicate::ICMP_ULE: 1573 return LHS.ule(RHS); 1574 case CmpInst::Predicate::ICMP_SGT: 1575 return LHS.sgt(RHS); 1576 case CmpInst::Predicate::ICMP_SGE: 1577 return LHS.sge(RHS); 1578 case CmpInst::Predicate::ICMP_SLT: 1579 return LHS.slt(RHS); 1580 case CmpInst::Predicate::ICMP_SLE: 1581 return LHS.sle(RHS); 1582 default: 1583 llvm_unreachable("Not an ICmp predicate!"); 1584 } 1585 } 1586 1587 void ICmpTestImpl(CmpInst::Predicate Pred) { 1588 unsigned Bits = 4; 1589 EnumerateTwoConstantRanges( 1590 Bits, [&](const ConstantRange &CR1, const ConstantRange &CR2) { 1591 bool Exhaustive = true; 1592 ForeachNumInConstantRange(CR1, [&](const APInt &N1) { 1593 ForeachNumInConstantRange( 1594 CR2, [&](const APInt &N2) { Exhaustive &= icmp(Pred, N1, N2); }); 1595 }); 1596 EXPECT_EQ(CR1.icmp(Pred, CR2), Exhaustive); 1597 }); 1598 } 1599 1600 TEST(ConstantRange, ICmp) { 1601 for (auto Pred : seq_inclusive(CmpInst::Predicate::FIRST_ICMP_PREDICATE, 1602 CmpInst::Predicate::LAST_ICMP_PREDICATE)) 1603 ICmpTestImpl(Pred); 1604 } 1605 1606 TEST(ConstantRange, MakeGuaranteedNoWrapRegion) { 1607 const int IntMin4Bits = 8; 1608 const int IntMax4Bits = 7; 1609 typedef OverflowingBinaryOperator OBO; 1610 1611 for (int Const : {0, -1, -2, 1, 2, IntMin4Bits, IntMax4Bits}) { 1612 APInt C(4, Const, true /* = isSigned */); 1613 1614 auto NUWRegion = ConstantRange::makeGuaranteedNoWrapRegion( 1615 Instruction::Add, C, OBO::NoUnsignedWrap); 1616 1617 EXPECT_FALSE(NUWRegion.isEmptySet()); 1618 1619 auto NSWRegion = ConstantRange::makeGuaranteedNoWrapRegion( 1620 Instruction::Add, C, OBO::NoSignedWrap); 1621 1622 EXPECT_FALSE(NSWRegion.isEmptySet()); 1623 1624 for (APInt I = NUWRegion.getLower(), E = NUWRegion.getUpper(); I != E; 1625 ++I) { 1626 bool Overflow = false; 1627 (void)I.uadd_ov(C, Overflow); 1628 EXPECT_FALSE(Overflow); 1629 } 1630 1631 for (APInt I = NSWRegion.getLower(), E = NSWRegion.getUpper(); I != E; 1632 ++I) { 1633 bool Overflow = false; 1634 (void)I.sadd_ov(C, Overflow); 1635 EXPECT_FALSE(Overflow); 1636 } 1637 } 1638 1639 for (int Const : {0, -1, -2, 1, 2, IntMin4Bits, IntMax4Bits}) { 1640 APInt C(4, Const, true /* = isSigned */); 1641 1642 auto NUWRegion = ConstantRange::makeGuaranteedNoWrapRegion( 1643 Instruction::Sub, C, OBO::NoUnsignedWrap); 1644 1645 EXPECT_FALSE(NUWRegion.isEmptySet()); 1646 1647 auto NSWRegion = ConstantRange::makeGuaranteedNoWrapRegion( 1648 Instruction::Sub, C, OBO::NoSignedWrap); 1649 1650 EXPECT_FALSE(NSWRegion.isEmptySet()); 1651 1652 for (APInt I = NUWRegion.getLower(), E = NUWRegion.getUpper(); I != E; 1653 ++I) { 1654 bool Overflow = false; 1655 (void)I.usub_ov(C, Overflow); 1656 EXPECT_FALSE(Overflow); 1657 } 1658 1659 for (APInt I = NSWRegion.getLower(), E = NSWRegion.getUpper(); I != E; 1660 ++I) { 1661 bool Overflow = false; 1662 (void)I.ssub_ov(C, Overflow); 1663 EXPECT_FALSE(Overflow); 1664 } 1665 } 1666 1667 auto NSWForAllValues = ConstantRange::makeGuaranteedNoWrapRegion( 1668 Instruction::Add, ConstantRange(32, /* isFullSet = */ true), 1669 OBO::NoSignedWrap); 1670 EXPECT_TRUE(NSWForAllValues.isSingleElement() && 1671 NSWForAllValues.getSingleElement()->isMinValue()); 1672 1673 NSWForAllValues = ConstantRange::makeGuaranteedNoWrapRegion( 1674 Instruction::Sub, ConstantRange(32, /* isFullSet = */ true), 1675 OBO::NoSignedWrap); 1676 EXPECT_TRUE(NSWForAllValues.isSingleElement() && 1677 NSWForAllValues.getSingleElement()->isMaxValue()); 1678 1679 auto NUWForAllValues = ConstantRange::makeGuaranteedNoWrapRegion( 1680 Instruction::Add, ConstantRange(32, /* isFullSet = */ true), 1681 OBO::NoUnsignedWrap); 1682 EXPECT_TRUE(NUWForAllValues.isSingleElement() && 1683 NUWForAllValues.getSingleElement()->isMinValue()); 1684 1685 NUWForAllValues = ConstantRange::makeGuaranteedNoWrapRegion( 1686 Instruction::Sub, ConstantRange(32, /* isFullSet = */ true), 1687 OBO::NoUnsignedWrap); 1688 EXPECT_TRUE(NUWForAllValues.isSingleElement() && 1689 NUWForAllValues.getSingleElement()->isMaxValue()); 1690 1691 EXPECT_TRUE(ConstantRange::makeGuaranteedNoWrapRegion( 1692 Instruction::Add, APInt(32, 0), OBO::NoUnsignedWrap).isFullSet()); 1693 EXPECT_TRUE(ConstantRange::makeGuaranteedNoWrapRegion( 1694 Instruction::Add, APInt(32, 0), OBO::NoSignedWrap).isFullSet()); 1695 EXPECT_TRUE(ConstantRange::makeGuaranteedNoWrapRegion( 1696 Instruction::Sub, APInt(32, 0), OBO::NoUnsignedWrap).isFullSet()); 1697 EXPECT_TRUE(ConstantRange::makeGuaranteedNoWrapRegion( 1698 Instruction::Sub, APInt(32, 0), OBO::NoSignedWrap).isFullSet()); 1699 1700 ConstantRange OneToFive(APInt(32, 1), APInt(32, 6)); 1701 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1702 Instruction::Add, OneToFive, OBO::NoSignedWrap), 1703 ConstantRange(APInt::getSignedMinValue(32), 1704 APInt::getSignedMaxValue(32) - 4)); 1705 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1706 Instruction::Add, OneToFive, OBO::NoUnsignedWrap), 1707 ConstantRange(APInt::getMinValue(32), APInt::getMinValue(32) - 5)); 1708 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1709 Instruction::Sub, OneToFive, OBO::NoSignedWrap), 1710 ConstantRange(APInt::getSignedMinValue(32) + 5, 1711 APInt::getSignedMinValue(32))); 1712 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1713 Instruction::Sub, OneToFive, OBO::NoUnsignedWrap), 1714 ConstantRange(APInt::getMinValue(32) + 5, APInt::getMinValue(32))); 1715 1716 ConstantRange MinusFiveToMinusTwo(APInt(32, -5), APInt(32, -1)); 1717 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1718 Instruction::Add, MinusFiveToMinusTwo, OBO::NoSignedWrap), 1719 ConstantRange(APInt::getSignedMinValue(32) + 5, 1720 APInt::getSignedMinValue(32))); 1721 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1722 Instruction::Add, MinusFiveToMinusTwo, OBO::NoUnsignedWrap), 1723 ConstantRange(APInt(32, 0), APInt(32, 2))); 1724 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1725 Instruction::Sub, MinusFiveToMinusTwo, OBO::NoSignedWrap), 1726 ConstantRange(APInt::getSignedMinValue(32), 1727 APInt::getSignedMaxValue(32) - 4)); 1728 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1729 Instruction::Sub, MinusFiveToMinusTwo, OBO::NoUnsignedWrap), 1730 ConstantRange(APInt::getMaxValue(32) - 1, 1731 APInt::getMinValue(32))); 1732 1733 ConstantRange MinusOneToOne(APInt(32, -1), APInt(32, 2)); 1734 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1735 Instruction::Add, MinusOneToOne, OBO::NoSignedWrap), 1736 ConstantRange(APInt::getSignedMinValue(32) + 1, 1737 APInt::getSignedMinValue(32) - 1)); 1738 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1739 Instruction::Add, MinusOneToOne, OBO::NoUnsignedWrap), 1740 ConstantRange(APInt(32, 0), APInt(32, 1))); 1741 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1742 Instruction::Sub, MinusOneToOne, OBO::NoSignedWrap), 1743 ConstantRange(APInt::getSignedMinValue(32) + 1, 1744 APInt::getSignedMinValue(32) - 1)); 1745 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1746 Instruction::Sub, MinusOneToOne, OBO::NoUnsignedWrap), 1747 ConstantRange(APInt::getMaxValue(32), 1748 APInt::getMinValue(32))); 1749 1750 ConstantRange One(APInt(32, 1), APInt(32, 2)); 1751 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1752 Instruction::Add, One, OBO::NoSignedWrap), 1753 ConstantRange(APInt::getSignedMinValue(32), 1754 APInt::getSignedMaxValue(32))); 1755 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1756 Instruction::Add, One, OBO::NoUnsignedWrap), 1757 ConstantRange(APInt::getMinValue(32), APInt::getMaxValue(32))); 1758 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1759 Instruction::Sub, One, OBO::NoSignedWrap), 1760 ConstantRange(APInt::getSignedMinValue(32) + 1, 1761 APInt::getSignedMinValue(32))); 1762 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1763 Instruction::Sub, One, OBO::NoUnsignedWrap), 1764 ConstantRange(APInt::getMinValue(32) + 1, APInt::getMinValue(32))); 1765 1766 ConstantRange OneLessThanBitWidth(APInt(32, 0), APInt(32, 31) + 1); 1767 ConstantRange UpToBitWidth(APInt(32, 0), APInt(32, 32) + 1); 1768 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1769 Instruction::Shl, UpToBitWidth, OBO::NoUnsignedWrap), 1770 ConstantRange::makeGuaranteedNoWrapRegion( 1771 Instruction::Shl, OneLessThanBitWidth, OBO::NoUnsignedWrap)); 1772 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1773 Instruction::Shl, UpToBitWidth, OBO::NoSignedWrap), 1774 ConstantRange::makeGuaranteedNoWrapRegion( 1775 Instruction::Shl, OneLessThanBitWidth, OBO::NoSignedWrap)); 1776 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1777 Instruction::Shl, UpToBitWidth, OBO::NoUnsignedWrap), 1778 ConstantRange(APInt(32, 0), APInt(32, 1) + 1)); 1779 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1780 Instruction::Shl, UpToBitWidth, OBO::NoSignedWrap), 1781 ConstantRange(APInt(32, -1), APInt(32, 0) + 1)); 1782 1783 EXPECT_EQ( 1784 ConstantRange::makeGuaranteedNoWrapRegion( 1785 Instruction::Shl, ConstantRange::getFull(32), OBO::NoUnsignedWrap), 1786 ConstantRange::makeGuaranteedNoWrapRegion( 1787 Instruction::Shl, OneLessThanBitWidth, OBO::NoUnsignedWrap)); 1788 EXPECT_EQ( 1789 ConstantRange::makeGuaranteedNoWrapRegion( 1790 Instruction::Shl, ConstantRange::getFull(32), OBO::NoSignedWrap), 1791 ConstantRange::makeGuaranteedNoWrapRegion( 1792 Instruction::Shl, OneLessThanBitWidth, OBO::NoSignedWrap)); 1793 1794 ConstantRange IllegalShAmt(APInt(32, 32), APInt(32, 0) + 1); 1795 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1796 Instruction::Shl, IllegalShAmt, OBO::NoUnsignedWrap), 1797 ConstantRange::getFull(32)); 1798 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1799 Instruction::Shl, IllegalShAmt, OBO::NoSignedWrap), 1800 ConstantRange::getFull(32)); 1801 1802 EXPECT_EQ( 1803 ConstantRange::makeGuaranteedNoWrapRegion( 1804 Instruction::Shl, ConstantRange(APInt(32, -32), APInt(32, 16) + 1), 1805 OBO::NoUnsignedWrap), 1806 ConstantRange::makeGuaranteedNoWrapRegion( 1807 Instruction::Shl, ConstantRange(APInt(32, 0), APInt(32, 16) + 1), 1808 OBO::NoUnsignedWrap)); 1809 EXPECT_EQ( 1810 ConstantRange::makeGuaranteedNoWrapRegion( 1811 Instruction::Shl, ConstantRange(APInt(32, -32), APInt(32, 16) + 1), 1812 OBO::NoSignedWrap), 1813 ConstantRange::makeGuaranteedNoWrapRegion( 1814 Instruction::Shl, ConstantRange(APInt(32, 0), APInt(32, 16) + 1), 1815 OBO::NoSignedWrap)); 1816 1817 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1818 Instruction::Shl, 1819 ConstantRange(APInt(32, -32), APInt(32, 16) + 1), 1820 OBO::NoUnsignedWrap), 1821 ConstantRange(APInt(32, 0), APInt(32, 65535) + 1)); 1822 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1823 Instruction::Shl, 1824 ConstantRange(APInt(32, -32), APInt(32, 16) + 1), 1825 OBO::NoSignedWrap), 1826 ConstantRange(APInt(32, -32768), APInt(32, 32767) + 1)); 1827 } 1828 1829 template<typename Fn> 1830 void TestNoWrapRegionExhaustive(Instruction::BinaryOps BinOp, 1831 unsigned NoWrapKind, Fn OverflowFn) { 1832 unsigned Bits = 5; 1833 EnumerateConstantRanges(Bits, [&](const ConstantRange &CR) { 1834 if (CR.isEmptySet()) 1835 return; 1836 if (Instruction::isShift(BinOp) && CR.getUnsignedMax().uge(Bits)) 1837 return; 1838 1839 ConstantRange NoWrap = 1840 ConstantRange::makeGuaranteedNoWrapRegion(BinOp, CR, NoWrapKind); 1841 ConstantRange Full = ConstantRange::getFull(Bits); 1842 ForeachNumInConstantRange(Full, [&](const APInt &N1) { 1843 bool NoOverflow = true; 1844 bool Overflow = true; 1845 ForeachNumInConstantRange(CR, [&](const APInt &N2) { 1846 if (OverflowFn(N1, N2)) 1847 NoOverflow = false; 1848 else 1849 Overflow = false; 1850 }); 1851 EXPECT_EQ(NoOverflow, NoWrap.contains(N1)); 1852 1853 // The no-wrap range is exact for single-element ranges. 1854 if (CR.isSingleElement()) { 1855 EXPECT_EQ(Overflow, !NoWrap.contains(N1)); 1856 } 1857 }); 1858 }); 1859 } 1860 1861 // Show that makeGuaranteedNoWrapRegion() is maximal, and for single-element 1862 // ranges also exact. 1863 TEST(ConstantRange, NoWrapRegionExhaustive) { 1864 TestNoWrapRegionExhaustive( 1865 Instruction::Add, OverflowingBinaryOperator::NoUnsignedWrap, 1866 [](const APInt &N1, const APInt &N2) { 1867 bool Overflow; 1868 (void) N1.uadd_ov(N2, Overflow); 1869 return Overflow; 1870 }); 1871 TestNoWrapRegionExhaustive( 1872 Instruction::Add, OverflowingBinaryOperator::NoSignedWrap, 1873 [](const APInt &N1, const APInt &N2) { 1874 bool Overflow; 1875 (void) N1.sadd_ov(N2, Overflow); 1876 return Overflow; 1877 }); 1878 TestNoWrapRegionExhaustive( 1879 Instruction::Sub, OverflowingBinaryOperator::NoUnsignedWrap, 1880 [](const APInt &N1, const APInt &N2) { 1881 bool Overflow; 1882 (void) N1.usub_ov(N2, Overflow); 1883 return Overflow; 1884 }); 1885 TestNoWrapRegionExhaustive( 1886 Instruction::Sub, OverflowingBinaryOperator::NoSignedWrap, 1887 [](const APInt &N1, const APInt &N2) { 1888 bool Overflow; 1889 (void) N1.ssub_ov(N2, Overflow); 1890 return Overflow; 1891 }); 1892 TestNoWrapRegionExhaustive( 1893 Instruction::Mul, OverflowingBinaryOperator::NoUnsignedWrap, 1894 [](const APInt &N1, const APInt &N2) { 1895 bool Overflow; 1896 (void) N1.umul_ov(N2, Overflow); 1897 return Overflow; 1898 }); 1899 TestNoWrapRegionExhaustive( 1900 Instruction::Mul, OverflowingBinaryOperator::NoSignedWrap, 1901 [](const APInt &N1, const APInt &N2) { 1902 bool Overflow; 1903 (void) N1.smul_ov(N2, Overflow); 1904 return Overflow; 1905 }); 1906 TestNoWrapRegionExhaustive(Instruction::Shl, 1907 OverflowingBinaryOperator::NoUnsignedWrap, 1908 [](const APInt &N1, const APInt &N2) { 1909 bool Overflow; 1910 (void)N1.ushl_ov(N2, Overflow); 1911 return Overflow; 1912 }); 1913 TestNoWrapRegionExhaustive(Instruction::Shl, 1914 OverflowingBinaryOperator::NoSignedWrap, 1915 [](const APInt &N1, const APInt &N2) { 1916 bool Overflow; 1917 (void)N1.sshl_ov(N2, Overflow); 1918 return Overflow; 1919 }); 1920 } 1921 1922 TEST(ConstantRange, GetEquivalentICmp) { 1923 APInt RHS; 1924 CmpInst::Predicate Pred; 1925 1926 EXPECT_TRUE(ConstantRange(APInt::getMinValue(32), APInt(32, 100)) 1927 .getEquivalentICmp(Pred, RHS)); 1928 EXPECT_EQ(Pred, CmpInst::ICMP_ULT); 1929 EXPECT_EQ(RHS, APInt(32, 100)); 1930 1931 EXPECT_TRUE(ConstantRange(APInt::getSignedMinValue(32), APInt(32, 100)) 1932 .getEquivalentICmp(Pred, RHS)); 1933 EXPECT_EQ(Pred, CmpInst::ICMP_SLT); 1934 EXPECT_EQ(RHS, APInt(32, 100)); 1935 1936 EXPECT_TRUE(ConstantRange(APInt(32, 100), APInt::getMinValue(32)) 1937 .getEquivalentICmp(Pred, RHS)); 1938 EXPECT_EQ(Pred, CmpInst::ICMP_UGE); 1939 EXPECT_EQ(RHS, APInt(32, 100)); 1940 1941 EXPECT_TRUE(ConstantRange(APInt(32, 100), APInt::getSignedMinValue(32)) 1942 .getEquivalentICmp(Pred, RHS)); 1943 EXPECT_EQ(Pred, CmpInst::ICMP_SGE); 1944 EXPECT_EQ(RHS, APInt(32, 100)); 1945 1946 EXPECT_TRUE( 1947 ConstantRange(32, /*isFullSet=*/true).getEquivalentICmp(Pred, RHS)); 1948 EXPECT_EQ(Pred, CmpInst::ICMP_UGE); 1949 EXPECT_EQ(RHS, APInt(32, 0)); 1950 1951 EXPECT_TRUE( 1952 ConstantRange(32, /*isFullSet=*/false).getEquivalentICmp(Pred, RHS)); 1953 EXPECT_EQ(Pred, CmpInst::ICMP_ULT); 1954 EXPECT_EQ(RHS, APInt(32, 0)); 1955 1956 EXPECT_FALSE(ConstantRange(APInt(32, 100), APInt(32, 200)) 1957 .getEquivalentICmp(Pred, RHS)); 1958 1959 EXPECT_FALSE(ConstantRange(APInt::getSignedMinValue(32) - APInt(32, 100), 1960 APInt::getSignedMinValue(32) + APInt(32, 100)) 1961 .getEquivalentICmp(Pred, RHS)); 1962 1963 EXPECT_FALSE(ConstantRange(APInt::getMinValue(32) - APInt(32, 100), 1964 APInt::getMinValue(32) + APInt(32, 100)) 1965 .getEquivalentICmp(Pred, RHS)); 1966 1967 EXPECT_TRUE(ConstantRange(APInt(32, 100)).getEquivalentICmp(Pred, RHS)); 1968 EXPECT_EQ(Pred, CmpInst::ICMP_EQ); 1969 EXPECT_EQ(RHS, APInt(32, 100)); 1970 1971 EXPECT_TRUE( 1972 ConstantRange(APInt(32, 100)).inverse().getEquivalentICmp(Pred, RHS)); 1973 EXPECT_EQ(Pred, CmpInst::ICMP_NE); 1974 EXPECT_EQ(RHS, APInt(32, 100)); 1975 1976 EXPECT_TRUE( 1977 ConstantRange(APInt(512, 100)).inverse().getEquivalentICmp(Pred, RHS)); 1978 EXPECT_EQ(Pred, CmpInst::ICMP_NE); 1979 EXPECT_EQ(RHS, APInt(512, 100)); 1980 1981 // NB! It would be correct for the following four calls to getEquivalentICmp 1982 // to return ordered predicates like CmpInst::ICMP_ULT or CmpInst::ICMP_UGT. 1983 // However, that's not the case today. 1984 1985 EXPECT_TRUE(ConstantRange(APInt(32, 0)).getEquivalentICmp(Pred, RHS)); 1986 EXPECT_EQ(Pred, CmpInst::ICMP_EQ); 1987 EXPECT_EQ(RHS, APInt(32, 0)); 1988 1989 EXPECT_TRUE( 1990 ConstantRange(APInt(32, 0)).inverse().getEquivalentICmp(Pred, RHS)); 1991 EXPECT_EQ(Pred, CmpInst::ICMP_NE); 1992 EXPECT_EQ(RHS, APInt(32, 0)); 1993 1994 EXPECT_TRUE(ConstantRange(APInt(32, -1)).getEquivalentICmp(Pred, RHS)); 1995 EXPECT_EQ(Pred, CmpInst::ICMP_EQ); 1996 EXPECT_EQ(RHS, APInt(32, -1)); 1997 1998 EXPECT_TRUE( 1999 ConstantRange(APInt(32, -1)).inverse().getEquivalentICmp(Pred, RHS)); 2000 EXPECT_EQ(Pred, CmpInst::ICMP_NE); 2001 EXPECT_EQ(RHS, APInt(32, -1)); 2002 } 2003 2004 #define EXPECT_MAY_OVERFLOW(op) \ 2005 EXPECT_EQ(ConstantRange::OverflowResult::MayOverflow, (op)) 2006 #define EXPECT_ALWAYS_OVERFLOWS_LOW(op) \ 2007 EXPECT_EQ(ConstantRange::OverflowResult::AlwaysOverflowsLow, (op)) 2008 #define EXPECT_ALWAYS_OVERFLOWS_HIGH(op) \ 2009 EXPECT_EQ(ConstantRange::OverflowResult::AlwaysOverflowsHigh, (op)) 2010 #define EXPECT_NEVER_OVERFLOWS(op) \ 2011 EXPECT_EQ(ConstantRange::OverflowResult::NeverOverflows, (op)) 2012 2013 TEST_F(ConstantRangeTest, UnsignedAddOverflow) { 2014 // Ill-defined - may overflow is a conservative result. 2015 EXPECT_MAY_OVERFLOW(Some.unsignedAddMayOverflow(Empty)); 2016 EXPECT_MAY_OVERFLOW(Empty.unsignedAddMayOverflow(Some)); 2017 2018 // Never overflow despite one full/wrap set. 2019 ConstantRange Zero(APInt::getZero(16)); 2020 EXPECT_NEVER_OVERFLOWS(Full.unsignedAddMayOverflow(Zero)); 2021 EXPECT_NEVER_OVERFLOWS(Wrap.unsignedAddMayOverflow(Zero)); 2022 EXPECT_NEVER_OVERFLOWS(Zero.unsignedAddMayOverflow(Full)); 2023 EXPECT_NEVER_OVERFLOWS(Zero.unsignedAddMayOverflow(Wrap)); 2024 2025 // But usually full/wrap always may overflow. 2026 EXPECT_MAY_OVERFLOW(Full.unsignedAddMayOverflow(One)); 2027 EXPECT_MAY_OVERFLOW(Wrap.unsignedAddMayOverflow(One)); 2028 EXPECT_MAY_OVERFLOW(One.unsignedAddMayOverflow(Full)); 2029 EXPECT_MAY_OVERFLOW(One.unsignedAddMayOverflow(Wrap)); 2030 2031 ConstantRange A(APInt(16, 0xfd00), APInt(16, 0xfe00)); 2032 ConstantRange B1(APInt(16, 0x0100), APInt(16, 0x0201)); 2033 ConstantRange B2(APInt(16, 0x0100), APInt(16, 0x0202)); 2034 EXPECT_NEVER_OVERFLOWS(A.unsignedAddMayOverflow(B1)); 2035 EXPECT_MAY_OVERFLOW(A.unsignedAddMayOverflow(B2)); 2036 EXPECT_NEVER_OVERFLOWS(B1.unsignedAddMayOverflow(A)); 2037 EXPECT_MAY_OVERFLOW(B2.unsignedAddMayOverflow(A)); 2038 2039 ConstantRange C1(APInt(16, 0x0299), APInt(16, 0x0400)); 2040 ConstantRange C2(APInt(16, 0x0300), APInt(16, 0x0400)); 2041 EXPECT_MAY_OVERFLOW(A.unsignedAddMayOverflow(C1)); 2042 EXPECT_ALWAYS_OVERFLOWS_HIGH(A.unsignedAddMayOverflow(C2)); 2043 EXPECT_MAY_OVERFLOW(C1.unsignedAddMayOverflow(A)); 2044 EXPECT_ALWAYS_OVERFLOWS_HIGH(C2.unsignedAddMayOverflow(A)); 2045 } 2046 2047 TEST_F(ConstantRangeTest, UnsignedSubOverflow) { 2048 // Ill-defined - may overflow is a conservative result. 2049 EXPECT_MAY_OVERFLOW(Some.unsignedSubMayOverflow(Empty)); 2050 EXPECT_MAY_OVERFLOW(Empty.unsignedSubMayOverflow(Some)); 2051 2052 // Never overflow despite one full/wrap set. 2053 ConstantRange Zero(APInt::getZero(16)); 2054 ConstantRange Max(APInt::getAllOnes(16)); 2055 EXPECT_NEVER_OVERFLOWS(Full.unsignedSubMayOverflow(Zero)); 2056 EXPECT_NEVER_OVERFLOWS(Wrap.unsignedSubMayOverflow(Zero)); 2057 EXPECT_NEVER_OVERFLOWS(Max.unsignedSubMayOverflow(Full)); 2058 EXPECT_NEVER_OVERFLOWS(Max.unsignedSubMayOverflow(Wrap)); 2059 2060 // But usually full/wrap always may overflow. 2061 EXPECT_MAY_OVERFLOW(Full.unsignedSubMayOverflow(One)); 2062 EXPECT_MAY_OVERFLOW(Wrap.unsignedSubMayOverflow(One)); 2063 EXPECT_MAY_OVERFLOW(One.unsignedSubMayOverflow(Full)); 2064 EXPECT_MAY_OVERFLOW(One.unsignedSubMayOverflow(Wrap)); 2065 2066 ConstantRange A(APInt(16, 0x0000), APInt(16, 0x0100)); 2067 ConstantRange B(APInt(16, 0x0100), APInt(16, 0x0200)); 2068 EXPECT_NEVER_OVERFLOWS(B.unsignedSubMayOverflow(A)); 2069 EXPECT_ALWAYS_OVERFLOWS_LOW(A.unsignedSubMayOverflow(B)); 2070 2071 ConstantRange A1(APInt(16, 0x0000), APInt(16, 0x0101)); 2072 ConstantRange B1(APInt(16, 0x0100), APInt(16, 0x0201)); 2073 EXPECT_NEVER_OVERFLOWS(B1.unsignedSubMayOverflow(A1)); 2074 EXPECT_MAY_OVERFLOW(A1.unsignedSubMayOverflow(B1)); 2075 2076 ConstantRange A2(APInt(16, 0x0000), APInt(16, 0x0102)); 2077 ConstantRange B2(APInt(16, 0x0100), APInt(16, 0x0202)); 2078 EXPECT_MAY_OVERFLOW(B2.unsignedSubMayOverflow(A2)); 2079 EXPECT_MAY_OVERFLOW(A2.unsignedSubMayOverflow(B2)); 2080 } 2081 2082 TEST_F(ConstantRangeTest, SignedAddOverflow) { 2083 // Ill-defined - may overflow is a conservative result. 2084 EXPECT_MAY_OVERFLOW(Some.signedAddMayOverflow(Empty)); 2085 EXPECT_MAY_OVERFLOW(Empty.signedAddMayOverflow(Some)); 2086 2087 // Never overflow despite one full/wrap set. 2088 ConstantRange Zero(APInt::getZero(16)); 2089 EXPECT_NEVER_OVERFLOWS(Full.signedAddMayOverflow(Zero)); 2090 EXPECT_NEVER_OVERFLOWS(Wrap.signedAddMayOverflow(Zero)); 2091 EXPECT_NEVER_OVERFLOWS(Zero.signedAddMayOverflow(Full)); 2092 EXPECT_NEVER_OVERFLOWS(Zero.signedAddMayOverflow(Wrap)); 2093 2094 // But usually full/wrap always may overflow. 2095 EXPECT_MAY_OVERFLOW(Full.signedAddMayOverflow(One)); 2096 EXPECT_MAY_OVERFLOW(Wrap.signedAddMayOverflow(One)); 2097 EXPECT_MAY_OVERFLOW(One.signedAddMayOverflow(Full)); 2098 EXPECT_MAY_OVERFLOW(One.signedAddMayOverflow(Wrap)); 2099 2100 ConstantRange A(APInt(16, 0x7d00), APInt(16, 0x7e00)); 2101 ConstantRange B1(APInt(16, 0x0100), APInt(16, 0x0201)); 2102 ConstantRange B2(APInt(16, 0x0100), APInt(16, 0x0202)); 2103 EXPECT_NEVER_OVERFLOWS(A.signedAddMayOverflow(B1)); 2104 EXPECT_MAY_OVERFLOW(A.signedAddMayOverflow(B2)); 2105 ConstantRange B3(APInt(16, 0x8000), APInt(16, 0x0201)); 2106 ConstantRange B4(APInt(16, 0x8000), APInt(16, 0x0202)); 2107 EXPECT_NEVER_OVERFLOWS(A.signedAddMayOverflow(B3)); 2108 EXPECT_MAY_OVERFLOW(A.signedAddMayOverflow(B4)); 2109 ConstantRange B5(APInt(16, 0x0299), APInt(16, 0x0400)); 2110 ConstantRange B6(APInt(16, 0x0300), APInt(16, 0x0400)); 2111 EXPECT_MAY_OVERFLOW(A.signedAddMayOverflow(B5)); 2112 EXPECT_ALWAYS_OVERFLOWS_HIGH(A.signedAddMayOverflow(B6)); 2113 2114 ConstantRange C(APInt(16, 0x8200), APInt(16, 0x8300)); 2115 ConstantRange D1(APInt(16, 0xfe00), APInt(16, 0xff00)); 2116 ConstantRange D2(APInt(16, 0xfd99), APInt(16, 0xff00)); 2117 EXPECT_NEVER_OVERFLOWS(C.signedAddMayOverflow(D1)); 2118 EXPECT_MAY_OVERFLOW(C.signedAddMayOverflow(D2)); 2119 ConstantRange D3(APInt(16, 0xfe00), APInt(16, 0x8000)); 2120 ConstantRange D4(APInt(16, 0xfd99), APInt(16, 0x8000)); 2121 EXPECT_NEVER_OVERFLOWS(C.signedAddMayOverflow(D3)); 2122 EXPECT_MAY_OVERFLOW(C.signedAddMayOverflow(D4)); 2123 ConstantRange D5(APInt(16, 0xfc00), APInt(16, 0xfd02)); 2124 ConstantRange D6(APInt(16, 0xfc00), APInt(16, 0xfd01)); 2125 EXPECT_MAY_OVERFLOW(C.signedAddMayOverflow(D5)); 2126 EXPECT_ALWAYS_OVERFLOWS_LOW(C.signedAddMayOverflow(D6)); 2127 2128 ConstantRange E(APInt(16, 0xff00), APInt(16, 0x0100)); 2129 EXPECT_NEVER_OVERFLOWS(E.signedAddMayOverflow(E)); 2130 ConstantRange F(APInt(16, 0xf000), APInt(16, 0x7000)); 2131 EXPECT_MAY_OVERFLOW(F.signedAddMayOverflow(F)); 2132 } 2133 2134 TEST_F(ConstantRangeTest, SignedSubOverflow) { 2135 // Ill-defined - may overflow is a conservative result. 2136 EXPECT_MAY_OVERFLOW(Some.signedSubMayOverflow(Empty)); 2137 EXPECT_MAY_OVERFLOW(Empty.signedSubMayOverflow(Some)); 2138 2139 // Never overflow despite one full/wrap set. 2140 ConstantRange Zero(APInt::getZero(16)); 2141 EXPECT_NEVER_OVERFLOWS(Full.signedSubMayOverflow(Zero)); 2142 EXPECT_NEVER_OVERFLOWS(Wrap.signedSubMayOverflow(Zero)); 2143 2144 // But usually full/wrap always may overflow. 2145 EXPECT_MAY_OVERFLOW(Full.signedSubMayOverflow(One)); 2146 EXPECT_MAY_OVERFLOW(Wrap.signedSubMayOverflow(One)); 2147 EXPECT_MAY_OVERFLOW(One.signedSubMayOverflow(Full)); 2148 EXPECT_MAY_OVERFLOW(One.signedSubMayOverflow(Wrap)); 2149 2150 ConstantRange A(APInt(16, 0x7d00), APInt(16, 0x7e00)); 2151 ConstantRange B1(APInt(16, 0xfe00), APInt(16, 0xff00)); 2152 ConstantRange B2(APInt(16, 0xfd99), APInt(16, 0xff00)); 2153 EXPECT_NEVER_OVERFLOWS(A.signedSubMayOverflow(B1)); 2154 EXPECT_MAY_OVERFLOW(A.signedSubMayOverflow(B2)); 2155 ConstantRange B3(APInt(16, 0xfc00), APInt(16, 0xfd02)); 2156 ConstantRange B4(APInt(16, 0xfc00), APInt(16, 0xfd01)); 2157 EXPECT_MAY_OVERFLOW(A.signedSubMayOverflow(B3)); 2158 EXPECT_ALWAYS_OVERFLOWS_HIGH(A.signedSubMayOverflow(B4)); 2159 2160 ConstantRange C(APInt(16, 0x8200), APInt(16, 0x8300)); 2161 ConstantRange D1(APInt(16, 0x0100), APInt(16, 0x0201)); 2162 ConstantRange D2(APInt(16, 0x0100), APInt(16, 0x0202)); 2163 EXPECT_NEVER_OVERFLOWS(C.signedSubMayOverflow(D1)); 2164 EXPECT_MAY_OVERFLOW(C.signedSubMayOverflow(D2)); 2165 ConstantRange D3(APInt(16, 0x0299), APInt(16, 0x0400)); 2166 ConstantRange D4(APInt(16, 0x0300), APInt(16, 0x0400)); 2167 EXPECT_MAY_OVERFLOW(C.signedSubMayOverflow(D3)); 2168 EXPECT_ALWAYS_OVERFLOWS_LOW(C.signedSubMayOverflow(D4)); 2169 2170 ConstantRange E(APInt(16, 0xff00), APInt(16, 0x0100)); 2171 EXPECT_NEVER_OVERFLOWS(E.signedSubMayOverflow(E)); 2172 ConstantRange F(APInt(16, 0xf000), APInt(16, 0x7001)); 2173 EXPECT_MAY_OVERFLOW(F.signedSubMayOverflow(F)); 2174 } 2175 2176 template<typename Fn1, typename Fn2> 2177 static void TestOverflowExhaustive(Fn1 OverflowFn, Fn2 MayOverflowFn) { 2178 // Constant range overflow checks are tested exhaustively on 4-bit numbers. 2179 unsigned Bits = 4; 2180 EnumerateTwoConstantRanges(Bits, [=](const ConstantRange &CR1, 2181 const ConstantRange &CR2) { 2182 // Loop over all N1 in CR1 and N2 in CR2 and check whether any of the 2183 // operations have overflow / have no overflow. 2184 bool RangeHasOverflowLow = false; 2185 bool RangeHasOverflowHigh = false; 2186 bool RangeHasNoOverflow = false; 2187 ForeachNumInConstantRange(CR1, [&](const APInt &N1) { 2188 ForeachNumInConstantRange(CR2, [&](const APInt &N2) { 2189 bool IsOverflowHigh; 2190 if (!OverflowFn(IsOverflowHigh, N1, N2)) { 2191 RangeHasNoOverflow = true; 2192 return; 2193 } 2194 2195 if (IsOverflowHigh) 2196 RangeHasOverflowHigh = true; 2197 else 2198 RangeHasOverflowLow = true; 2199 }); 2200 }); 2201 2202 ConstantRange::OverflowResult OR = MayOverflowFn(CR1, CR2); 2203 switch (OR) { 2204 case ConstantRange::OverflowResult::AlwaysOverflowsLow: 2205 EXPECT_TRUE(RangeHasOverflowLow); 2206 EXPECT_FALSE(RangeHasOverflowHigh); 2207 EXPECT_FALSE(RangeHasNoOverflow); 2208 break; 2209 case ConstantRange::OverflowResult::AlwaysOverflowsHigh: 2210 EXPECT_TRUE(RangeHasOverflowHigh); 2211 EXPECT_FALSE(RangeHasOverflowLow); 2212 EXPECT_FALSE(RangeHasNoOverflow); 2213 break; 2214 case ConstantRange::OverflowResult::NeverOverflows: 2215 EXPECT_FALSE(RangeHasOverflowLow); 2216 EXPECT_FALSE(RangeHasOverflowHigh); 2217 EXPECT_TRUE(RangeHasNoOverflow); 2218 break; 2219 case ConstantRange::OverflowResult::MayOverflow: 2220 // We return MayOverflow for empty sets as a conservative result, 2221 // but of course neither the RangeHasOverflow nor the 2222 // RangeHasNoOverflow flags will be set. 2223 if (CR1.isEmptySet() || CR2.isEmptySet()) 2224 break; 2225 2226 EXPECT_TRUE(RangeHasOverflowLow || RangeHasOverflowHigh); 2227 EXPECT_TRUE(RangeHasNoOverflow); 2228 break; 2229 } 2230 }); 2231 } 2232 2233 TEST_F(ConstantRangeTest, UnsignedAddOverflowExhaustive) { 2234 TestOverflowExhaustive( 2235 [](bool &IsOverflowHigh, const APInt &N1, const APInt &N2) { 2236 bool Overflow; 2237 (void) N1.uadd_ov(N2, Overflow); 2238 IsOverflowHigh = true; 2239 return Overflow; 2240 }, 2241 [](const ConstantRange &CR1, const ConstantRange &CR2) { 2242 return CR1.unsignedAddMayOverflow(CR2); 2243 }); 2244 } 2245 2246 TEST_F(ConstantRangeTest, UnsignedSubOverflowExhaustive) { 2247 TestOverflowExhaustive( 2248 [](bool &IsOverflowHigh, const APInt &N1, const APInt &N2) { 2249 bool Overflow; 2250 (void) N1.usub_ov(N2, Overflow); 2251 IsOverflowHigh = false; 2252 return Overflow; 2253 }, 2254 [](const ConstantRange &CR1, const ConstantRange &CR2) { 2255 return CR1.unsignedSubMayOverflow(CR2); 2256 }); 2257 } 2258 2259 TEST_F(ConstantRangeTest, UnsignedMulOverflowExhaustive) { 2260 TestOverflowExhaustive( 2261 [](bool &IsOverflowHigh, const APInt &N1, const APInt &N2) { 2262 bool Overflow; 2263 (void) N1.umul_ov(N2, Overflow); 2264 IsOverflowHigh = true; 2265 return Overflow; 2266 }, 2267 [](const ConstantRange &CR1, const ConstantRange &CR2) { 2268 return CR1.unsignedMulMayOverflow(CR2); 2269 }); 2270 } 2271 2272 TEST_F(ConstantRangeTest, SignedAddOverflowExhaustive) { 2273 TestOverflowExhaustive( 2274 [](bool &IsOverflowHigh, const APInt &N1, const APInt &N2) { 2275 bool Overflow; 2276 (void) N1.sadd_ov(N2, Overflow); 2277 IsOverflowHigh = N1.isNonNegative(); 2278 return Overflow; 2279 }, 2280 [](const ConstantRange &CR1, const ConstantRange &CR2) { 2281 return CR1.signedAddMayOverflow(CR2); 2282 }); 2283 } 2284 2285 TEST_F(ConstantRangeTest, SignedSubOverflowExhaustive) { 2286 TestOverflowExhaustive( 2287 [](bool &IsOverflowHigh, const APInt &N1, const APInt &N2) { 2288 bool Overflow; 2289 (void) N1.ssub_ov(N2, Overflow); 2290 IsOverflowHigh = N1.isNonNegative(); 2291 return Overflow; 2292 }, 2293 [](const ConstantRange &CR1, const ConstantRange &CR2) { 2294 return CR1.signedSubMayOverflow(CR2); 2295 }); 2296 } 2297 2298 TEST_F(ConstantRangeTest, FromKnownBits) { 2299 KnownBits Unknown(16); 2300 EXPECT_EQ(Full, ConstantRange::fromKnownBits(Unknown, /*signed*/false)); 2301 EXPECT_EQ(Full, ConstantRange::fromKnownBits(Unknown, /*signed*/true)); 2302 2303 // .10..01. -> unsigned 01000010 (66) to 11011011 (219) 2304 // -> signed 11000010 (194) to 01011011 (91) 2305 KnownBits Known(8); 2306 Known.Zero = 36; 2307 Known.One = 66; 2308 ConstantRange Unsigned(APInt(8, 66), APInt(8, 219 + 1)); 2309 ConstantRange Signed(APInt(8, 194), APInt(8, 91 + 1)); 2310 EXPECT_EQ(Unsigned, ConstantRange::fromKnownBits(Known, /*signed*/false)); 2311 EXPECT_EQ(Signed, ConstantRange::fromKnownBits(Known, /*signed*/true)); 2312 2313 // 1.10.10. -> 10100100 (164) to 11101101 (237) 2314 Known.Zero = 18; 2315 Known.One = 164; 2316 ConstantRange CR1(APInt(8, 164), APInt(8, 237 + 1)); 2317 EXPECT_EQ(CR1, ConstantRange::fromKnownBits(Known, /*signed*/false)); 2318 EXPECT_EQ(CR1, ConstantRange::fromKnownBits(Known, /*signed*/true)); 2319 2320 // 01.0.1.0 -> 01000100 (68) to 01101110 (110) 2321 Known.Zero = 145; 2322 Known.One = 68; 2323 ConstantRange CR2(APInt(8, 68), APInt(8, 110 + 1)); 2324 EXPECT_EQ(CR2, ConstantRange::fromKnownBits(Known, /*signed*/false)); 2325 EXPECT_EQ(CR2, ConstantRange::fromKnownBits(Known, /*signed*/true)); 2326 } 2327 2328 TEST_F(ConstantRangeTest, FromKnownBitsExhaustive) { 2329 unsigned Bits = 4; 2330 unsigned Max = 1 << Bits; 2331 KnownBits Known(Bits); 2332 for (unsigned Zero = 0; Zero < Max; ++Zero) { 2333 for (unsigned One = 0; One < Max; ++One) { 2334 Known.Zero = Zero; 2335 Known.One = One; 2336 if (Known.hasConflict() || Known.isUnknown()) 2337 continue; 2338 2339 UnsignedOpRangeGatherer UR(Bits); 2340 SignedOpRangeGatherer SR(Bits); 2341 for (unsigned N = 0; N < Max; ++N) { 2342 APInt Num(Bits, N); 2343 if ((Num & Known.Zero) != 0 || (~Num & Known.One) != 0) 2344 continue; 2345 2346 UR.account(Num); 2347 SR.account(Num); 2348 } 2349 2350 ConstantRange UnsignedCR = UR.getRange(); 2351 ConstantRange SignedCR = SR.getRange(); 2352 EXPECT_EQ(UnsignedCR, ConstantRange::fromKnownBits(Known, false)); 2353 EXPECT_EQ(SignedCR, ConstantRange::fromKnownBits(Known, true)); 2354 } 2355 } 2356 } 2357 2358 TEST_F(ConstantRangeTest, Negative) { 2359 // All elements in an empty set (of which there are none) are both negative 2360 // and non-negative. Empty & full sets checked explicitly for clarity, but 2361 // they are also covered by the exhaustive test below. 2362 EXPECT_TRUE(Empty.isAllNegative()); 2363 EXPECT_TRUE(Empty.isAllNonNegative()); 2364 EXPECT_FALSE(Full.isAllNegative()); 2365 EXPECT_FALSE(Full.isAllNonNegative()); 2366 2367 unsigned Bits = 4; 2368 EnumerateConstantRanges(Bits, [](const ConstantRange &CR) { 2369 bool AllNegative = true; 2370 bool AllNonNegative = true; 2371 ForeachNumInConstantRange(CR, [&](const APInt &N) { 2372 if (!N.isNegative()) 2373 AllNegative = false; 2374 if (!N.isNonNegative()) 2375 AllNonNegative = false; 2376 }); 2377 assert((CR.isEmptySet() || !AllNegative || !AllNonNegative) && 2378 "Only empty set can be both all negative and all non-negative"); 2379 2380 EXPECT_EQ(AllNegative, CR.isAllNegative()); 2381 EXPECT_EQ(AllNonNegative, CR.isAllNonNegative()); 2382 }); 2383 } 2384 2385 TEST_F(ConstantRangeTest, UAddSat) { 2386 TestBinaryOpExhaustive( 2387 [](const ConstantRange &CR1, const ConstantRange &CR2) { 2388 return CR1.uadd_sat(CR2); 2389 }, 2390 [](const APInt &N1, const APInt &N2) { 2391 return N1.uadd_sat(N2); 2392 }, 2393 PreferSmallestUnsigned); 2394 } 2395 2396 TEST_F(ConstantRangeTest, USubSat) { 2397 TestBinaryOpExhaustive( 2398 [](const ConstantRange &CR1, const ConstantRange &CR2) { 2399 return CR1.usub_sat(CR2); 2400 }, 2401 [](const APInt &N1, const APInt &N2) { 2402 return N1.usub_sat(N2); 2403 }, 2404 PreferSmallestUnsigned); 2405 } 2406 2407 TEST_F(ConstantRangeTest, UMulSat) { 2408 TestBinaryOpExhaustive( 2409 [](const ConstantRange &CR1, const ConstantRange &CR2) { 2410 return CR1.umul_sat(CR2); 2411 }, 2412 [](const APInt &N1, const APInt &N2) { return N1.umul_sat(N2); }, 2413 PreferSmallestUnsigned); 2414 } 2415 2416 TEST_F(ConstantRangeTest, UShlSat) { 2417 TestBinaryOpExhaustive( 2418 [](const ConstantRange &CR1, const ConstantRange &CR2) { 2419 return CR1.ushl_sat(CR2); 2420 }, 2421 [](const APInt &N1, const APInt &N2) { return N1.ushl_sat(N2); }, 2422 PreferSmallestUnsigned); 2423 } 2424 2425 TEST_F(ConstantRangeTest, SAddSat) { 2426 TestBinaryOpExhaustive( 2427 [](const ConstantRange &CR1, const ConstantRange &CR2) { 2428 return CR1.sadd_sat(CR2); 2429 }, 2430 [](const APInt &N1, const APInt &N2) { 2431 return N1.sadd_sat(N2); 2432 }, 2433 PreferSmallestSigned); 2434 } 2435 2436 TEST_F(ConstantRangeTest, SSubSat) { 2437 TestBinaryOpExhaustive( 2438 [](const ConstantRange &CR1, const ConstantRange &CR2) { 2439 return CR1.ssub_sat(CR2); 2440 }, 2441 [](const APInt &N1, const APInt &N2) { 2442 return N1.ssub_sat(N2); 2443 }, 2444 PreferSmallestSigned); 2445 } 2446 2447 TEST_F(ConstantRangeTest, SMulSat) { 2448 TestBinaryOpExhaustive( 2449 [](const ConstantRange &CR1, const ConstantRange &CR2) { 2450 return CR1.smul_sat(CR2); 2451 }, 2452 [](const APInt &N1, const APInt &N2) { return N1.smul_sat(N2); }, 2453 PreferSmallestSigned); 2454 } 2455 2456 TEST_F(ConstantRangeTest, SShlSat) { 2457 TestBinaryOpExhaustive( 2458 [](const ConstantRange &CR1, const ConstantRange &CR2) { 2459 return CR1.sshl_sat(CR2); 2460 }, 2461 [](const APInt &N1, const APInt &N2) { return N1.sshl_sat(N2); }, 2462 PreferSmallestSigned); 2463 } 2464 2465 TEST_F(ConstantRangeTest, Abs) { 2466 TestUnaryOpExhaustive( 2467 [](const ConstantRange &CR) { return CR.abs(); }, 2468 [](const APInt &N) { return N.abs(); }); 2469 2470 TestUnaryOpExhaustive( 2471 [](const ConstantRange &CR) { return CR.abs(/*IntMinIsPoison=*/true); }, 2472 [](const APInt &N) -> Optional<APInt> { 2473 if (N.isMinSignedValue()) 2474 return None; 2475 return N.abs(); 2476 }); 2477 } 2478 2479 TEST_F(ConstantRangeTest, castOps) { 2480 ConstantRange A(APInt(16, 66), APInt(16, 128)); 2481 ConstantRange FpToI8 = A.castOp(Instruction::FPToSI, 8); 2482 EXPECT_EQ(8u, FpToI8.getBitWidth()); 2483 EXPECT_TRUE(FpToI8.isFullSet()); 2484 2485 ConstantRange FpToI16 = A.castOp(Instruction::FPToSI, 16); 2486 EXPECT_EQ(16u, FpToI16.getBitWidth()); 2487 EXPECT_EQ(A, FpToI16); 2488 2489 ConstantRange FPExtToDouble = A.castOp(Instruction::FPExt, 64); 2490 EXPECT_EQ(64u, FPExtToDouble.getBitWidth()); 2491 EXPECT_TRUE(FPExtToDouble.isFullSet()); 2492 2493 ConstantRange PtrToInt = A.castOp(Instruction::PtrToInt, 64); 2494 EXPECT_EQ(64u, PtrToInt.getBitWidth()); 2495 EXPECT_TRUE(PtrToInt.isFullSet()); 2496 2497 ConstantRange IntToPtr = A.castOp(Instruction::IntToPtr, 64); 2498 EXPECT_EQ(64u, IntToPtr.getBitWidth()); 2499 EXPECT_TRUE(IntToPtr.isFullSet()); 2500 } 2501 2502 TEST_F(ConstantRangeTest, binaryXor) { 2503 // Single element ranges. 2504 ConstantRange R16(APInt(8, 16)); 2505 ConstantRange R20(APInt(8, 20)); 2506 EXPECT_EQ(*R16.binaryXor(R16).getSingleElement(), APInt(8, 0)); 2507 EXPECT_EQ(*R16.binaryXor(R20).getSingleElement(), APInt(8, 16 ^ 20)); 2508 2509 // Ranges with more than a single element. Handled conservatively for now. 2510 ConstantRange R16_35(APInt(8, 16), APInt(8, 35)); 2511 ConstantRange R0_99(APInt(8, 0), APInt(8, 99)); 2512 EXPECT_TRUE(R16_35.binaryXor(R16_35).isFullSet()); 2513 EXPECT_TRUE(R16_35.binaryXor(R0_99).isFullSet()); 2514 EXPECT_TRUE(R0_99.binaryXor(R16_35).isFullSet()); 2515 } 2516 2517 TEST_F(ConstantRangeTest, binaryNot) { 2518 TestUnaryOpExhaustive( 2519 [](const ConstantRange &CR) { return CR.binaryNot(); }, 2520 [](const APInt &N) { return ~N; }, 2521 PreferSmallest); 2522 TestUnaryOpExhaustive( 2523 [](const ConstantRange &CR) { 2524 return CR.binaryXor(ConstantRange(APInt::getAllOnes(CR.getBitWidth()))); 2525 }, 2526 [](const APInt &N) { return ~N; }, PreferSmallest); 2527 TestUnaryOpExhaustive( 2528 [](const ConstantRange &CR) { 2529 return ConstantRange(APInt::getAllOnes(CR.getBitWidth())).binaryXor(CR); 2530 }, 2531 [](const APInt &N) { return ~N; }, PreferSmallest); 2532 } 2533 2534 } // anonymous namespace 2535