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, UMax) { 1085 EXPECT_EQ(Full.umax(Full), Full); 1086 EXPECT_EQ(Full.umax(Empty), Empty); 1087 EXPECT_EQ(Full.umax(Some), ConstantRange(APInt(16, 0xa), APInt(16, 0))); 1088 EXPECT_EQ(Full.umax(Wrap), Full); 1089 EXPECT_EQ(Full.umax(Some), ConstantRange(APInt(16, 0xa), APInt(16, 0))); 1090 EXPECT_EQ(Empty.umax(Empty), Empty); 1091 EXPECT_EQ(Empty.umax(Some), Empty); 1092 EXPECT_EQ(Empty.umax(Wrap), Empty); 1093 EXPECT_EQ(Empty.umax(One), Empty); 1094 EXPECT_EQ(Some.umax(Some), Some); 1095 EXPECT_EQ(Some.umax(Wrap), ConstantRange(APInt(16, 0xa), APInt(16, 0))); 1096 EXPECT_EQ(Some.umax(One), Some); 1097 EXPECT_EQ(Wrap.umax(Wrap), Wrap); 1098 EXPECT_EQ(Wrap.umax(One), ConstantRange(APInt(16, 0xa), APInt(16, 0))); 1099 EXPECT_EQ(One.umax(One), One); 1100 1101 TestBinaryOpExhaustive( 1102 [](const ConstantRange &CR1, const ConstantRange &CR2) { 1103 return CR1.umax(CR2); 1104 }, 1105 [](const APInt &N1, const APInt &N2) { 1106 return APIntOps::umax(N1, N2); 1107 }, 1108 PreferSmallestNonFullUnsigned); 1109 } 1110 1111 TEST_F(ConstantRangeTest, SMax) { 1112 EXPECT_EQ(Full.smax(Full), Full); 1113 EXPECT_EQ(Full.smax(Empty), Empty); 1114 EXPECT_EQ(Full.smax(Some), ConstantRange(APInt(16, 0xa), 1115 APInt::getSignedMinValue(16))); 1116 EXPECT_EQ(Full.smax(Wrap), Full); 1117 EXPECT_EQ(Full.smax(One), ConstantRange(APInt(16, 0xa), 1118 APInt::getSignedMinValue(16))); 1119 EXPECT_EQ(Empty.smax(Empty), Empty); 1120 EXPECT_EQ(Empty.smax(Some), Empty); 1121 EXPECT_EQ(Empty.smax(Wrap), Empty); 1122 EXPECT_EQ(Empty.smax(One), Empty); 1123 EXPECT_EQ(Some.smax(Some), Some); 1124 EXPECT_EQ(Some.smax(Wrap), ConstantRange(APInt(16, 0xa), 1125 APInt(16, (uint64_t)INT16_MIN))); 1126 EXPECT_EQ(Some.smax(One), Some); 1127 EXPECT_EQ(Wrap.smax(One), ConstantRange(APInt(16, 0xa), 1128 APInt(16, (uint64_t)INT16_MIN))); 1129 EXPECT_EQ(One.smax(One), One); 1130 1131 TestBinaryOpExhaustive( 1132 [](const ConstantRange &CR1, const ConstantRange &CR2) { 1133 return CR1.smax(CR2); 1134 }, 1135 [](const APInt &N1, const APInt &N2) { 1136 return APIntOps::smax(N1, N2); 1137 }, 1138 PreferSmallestNonFullSigned); 1139 } 1140 1141 TEST_F(ConstantRangeTest, UMin) { 1142 EXPECT_EQ(Full.umin(Full), Full); 1143 EXPECT_EQ(Full.umin(Empty), Empty); 1144 EXPECT_EQ(Full.umin(Some), ConstantRange(APInt(16, 0), APInt(16, 0xaaa))); 1145 EXPECT_EQ(Full.umin(Wrap), Full); 1146 EXPECT_EQ(Empty.umin(Empty), Empty); 1147 EXPECT_EQ(Empty.umin(Some), Empty); 1148 EXPECT_EQ(Empty.umin(Wrap), Empty); 1149 EXPECT_EQ(Empty.umin(One), Empty); 1150 EXPECT_EQ(Some.umin(Some), Some); 1151 EXPECT_EQ(Some.umin(Wrap), ConstantRange(APInt(16, 0), APInt(16, 0xaaa))); 1152 EXPECT_EQ(Some.umin(One), One); 1153 EXPECT_EQ(Wrap.umin(Wrap), Wrap); 1154 EXPECT_EQ(Wrap.umin(One), ConstantRange(APInt(16, 0), APInt(16, 0xb))); 1155 EXPECT_EQ(One.umin(One), One); 1156 1157 TestBinaryOpExhaustive( 1158 [](const ConstantRange &CR1, const ConstantRange &CR2) { 1159 return CR1.umin(CR2); 1160 }, 1161 [](const APInt &N1, const APInt &N2) { 1162 return APIntOps::umin(N1, N2); 1163 }, 1164 PreferSmallestNonFullUnsigned); 1165 } 1166 1167 TEST_F(ConstantRangeTest, SMin) { 1168 EXPECT_EQ(Full.smin(Full), Full); 1169 EXPECT_EQ(Full.smin(Empty), Empty); 1170 EXPECT_EQ(Full.smin(Some), ConstantRange(APInt(16, (uint64_t)INT16_MIN), 1171 APInt(16, 0xaaa))); 1172 EXPECT_EQ(Full.smin(Wrap), Full); 1173 EXPECT_EQ(Empty.smin(Empty), Empty); 1174 EXPECT_EQ(Empty.smin(Some), Empty); 1175 EXPECT_EQ(Empty.smin(Wrap), Empty); 1176 EXPECT_EQ(Empty.smin(One), Empty); 1177 EXPECT_EQ(Some.smin(Some), Some); 1178 EXPECT_EQ(Some.smin(Wrap), ConstantRange(APInt(16, (uint64_t)INT16_MIN), 1179 APInt(16, 0xaaa))); 1180 EXPECT_EQ(Some.smin(One), One); 1181 EXPECT_EQ(Wrap.smin(Wrap), Wrap); 1182 EXPECT_EQ(Wrap.smin(One), ConstantRange(APInt(16, (uint64_t)INT16_MIN), 1183 APInt(16, 0xb))); 1184 EXPECT_EQ(One.smin(One), One); 1185 1186 TestBinaryOpExhaustive( 1187 [](const ConstantRange &CR1, const ConstantRange &CR2) { 1188 return CR1.smin(CR2); 1189 }, 1190 [](const APInt &N1, const APInt &N2) { 1191 return APIntOps::smin(N1, N2); 1192 }, 1193 PreferSmallestNonFullSigned); 1194 } 1195 1196 TEST_F(ConstantRangeTest, UDiv) { 1197 EXPECT_EQ(Full.udiv(Full), Full); 1198 EXPECT_EQ(Full.udiv(Empty), Empty); 1199 EXPECT_EQ(Full.udiv(One), ConstantRange(APInt(16, 0), 1200 APInt(16, 0xffff / 0xa + 1))); 1201 EXPECT_EQ(Full.udiv(Some), ConstantRange(APInt(16, 0), 1202 APInt(16, 0xffff / 0xa + 1))); 1203 EXPECT_EQ(Full.udiv(Wrap), Full); 1204 EXPECT_EQ(Empty.udiv(Empty), Empty); 1205 EXPECT_EQ(Empty.udiv(One), Empty); 1206 EXPECT_EQ(Empty.udiv(Some), Empty); 1207 EXPECT_EQ(Empty.udiv(Wrap), Empty); 1208 EXPECT_EQ(One.udiv(One), ConstantRange(APInt(16, 1))); 1209 EXPECT_EQ(One.udiv(Some), ConstantRange(APInt(16, 0), APInt(16, 2))); 1210 EXPECT_EQ(One.udiv(Wrap), ConstantRange(APInt(16, 0), APInt(16, 0xb))); 1211 EXPECT_EQ(Some.udiv(Some), ConstantRange(APInt(16, 0), APInt(16, 0x111))); 1212 EXPECT_EQ(Some.udiv(Wrap), ConstantRange(APInt(16, 0), APInt(16, 0xaaa))); 1213 EXPECT_EQ(Wrap.udiv(Wrap), Full); 1214 1215 1216 ConstantRange Zero(APInt(16, 0)); 1217 EXPECT_EQ(Zero.udiv(One), Zero); 1218 EXPECT_EQ(Zero.udiv(Full), Zero); 1219 1220 EXPECT_EQ(ConstantRange(APInt(16, 0), APInt(16, 99)).udiv(Full), 1221 ConstantRange(APInt(16, 0), APInt(16, 99))); 1222 EXPECT_EQ(ConstantRange(APInt(16, 10), APInt(16, 99)).udiv(Full), 1223 ConstantRange(APInt(16, 0), APInt(16, 99))); 1224 } 1225 1226 TEST_F(ConstantRangeTest, SDiv) { 1227 unsigned Bits = 4; 1228 EnumerateTwoConstantRanges(Bits, [&](const ConstantRange &CR1, 1229 const ConstantRange &CR2) { 1230 // Collect possible results in a bit vector. We store the signed value plus 1231 // a bias to make it unsigned. 1232 int Bias = 1 << (Bits - 1); 1233 BitVector Results(1 << Bits); 1234 ForeachNumInConstantRange(CR1, [&](const APInt &N1) { 1235 ForeachNumInConstantRange(CR2, [&](const APInt &N2) { 1236 // Division by zero is UB. 1237 if (N2 == 0) 1238 return; 1239 1240 // SignedMin / -1 is UB. 1241 if (N1.isMinSignedValue() && N2.isAllOnes()) 1242 return; 1243 1244 APInt N = N1.sdiv(N2); 1245 Results.set(N.getSExtValue() + Bias); 1246 }); 1247 }); 1248 1249 ConstantRange CR = CR1.sdiv(CR2); 1250 if (Results.none()) { 1251 EXPECT_TRUE(CR.isEmptySet()); 1252 return; 1253 } 1254 1255 // If there is a non-full signed envelope, that should be the result. 1256 APInt SMin(Bits, Results.find_first() - Bias); 1257 APInt SMax(Bits, Results.find_last() - Bias); 1258 ConstantRange Envelope = ConstantRange::getNonEmpty(SMin, SMax + 1); 1259 if (!Envelope.isFullSet()) { 1260 EXPECT_EQ(Envelope, CR); 1261 return; 1262 } 1263 1264 // If the signed envelope is a full set, try to find a smaller sign wrapped 1265 // set that is separated in negative and positive components (or one which 1266 // can also additionally contain zero). 1267 int LastNeg = Results.find_last_in(0, Bias) - Bias; 1268 int LastPos = Results.find_next(Bias) - Bias; 1269 if (Results[Bias]) { 1270 if (LastNeg == -1) 1271 ++LastNeg; 1272 else if (LastPos == 1) 1273 --LastPos; 1274 } 1275 1276 APInt WMax(Bits, LastNeg); 1277 APInt WMin(Bits, LastPos); 1278 ConstantRange Wrapped = ConstantRange::getNonEmpty(WMin, WMax + 1); 1279 EXPECT_EQ(Wrapped, CR); 1280 }); 1281 } 1282 1283 TEST_F(ConstantRangeTest, URem) { 1284 EXPECT_EQ(Full.urem(Empty), Empty); 1285 EXPECT_EQ(Empty.urem(Full), Empty); 1286 // urem by zero is poison. 1287 EXPECT_EQ(Full.urem(ConstantRange(APInt(16, 0))), Empty); 1288 // urem by full range doesn't contain MaxValue. 1289 EXPECT_EQ(Full.urem(Full), ConstantRange(APInt(16, 0), APInt(16, 0xffff))); 1290 // urem is upper bounded by maximum RHS minus one. 1291 EXPECT_EQ(Full.urem(ConstantRange(APInt(16, 0), APInt(16, 123))), 1292 ConstantRange(APInt(16, 0), APInt(16, 122))); 1293 // urem is upper bounded by maximum LHS. 1294 EXPECT_EQ(ConstantRange(APInt(16, 0), APInt(16, 123)).urem(Full), 1295 ConstantRange(APInt(16, 0), APInt(16, 123))); 1296 // If the LHS is always lower than the RHS, the result is the LHS. 1297 EXPECT_EQ(ConstantRange(APInt(16, 10), APInt(16, 20)) 1298 .urem(ConstantRange(APInt(16, 20), APInt(16, 30))), 1299 ConstantRange(APInt(16, 10), APInt(16, 20))); 1300 // It has to be strictly lower, otherwise the top value may wrap to zero. 1301 EXPECT_EQ(ConstantRange(APInt(16, 10), APInt(16, 20)) 1302 .urem(ConstantRange(APInt(16, 19), APInt(16, 30))), 1303 ConstantRange(APInt(16, 0), APInt(16, 20))); 1304 // [12, 14] % 10 is [2, 4], but we conservatively compute [0, 9]. 1305 EXPECT_EQ(ConstantRange(APInt(16, 12), APInt(16, 15)) 1306 .urem(ConstantRange(APInt(16, 10))), 1307 ConstantRange(APInt(16, 0), APInt(16, 10))); 1308 1309 TestBinaryOpExhaustive( 1310 [](const ConstantRange &CR1, const ConstantRange &CR2) { 1311 return CR1.urem(CR2); 1312 }, 1313 [](const APInt &N1, const APInt &N2) -> Optional<APInt> { 1314 if (N2.isZero()) 1315 return None; 1316 return N1.urem(N2); 1317 }, 1318 PreferSmallest, 1319 CheckSingleElementsOnly); 1320 } 1321 1322 TEST_F(ConstantRangeTest, SRem) { 1323 EXPECT_EQ(Full.srem(Empty), Empty); 1324 EXPECT_EQ(Empty.srem(Full), Empty); 1325 // srem by zero is UB. 1326 EXPECT_EQ(Full.srem(ConstantRange(APInt(16, 0))), Empty); 1327 // srem by full range doesn't contain SignedMinValue. 1328 EXPECT_EQ(Full.srem(Full), ConstantRange(APInt::getSignedMinValue(16) + 1, 1329 APInt::getSignedMinValue(16))); 1330 1331 ConstantRange PosMod(APInt(16, 10), APInt(16, 21)); // [10, 20] 1332 ConstantRange NegMod(APInt(16, -20), APInt(16, -9)); // [-20, -10] 1333 ConstantRange IntMinMod(APInt::getSignedMinValue(16)); 1334 1335 ConstantRange Expected(16, true); 1336 1337 // srem is bounded by abs(RHS) minus one. 1338 ConstantRange PosLargeLHS(APInt(16, 0), APInt(16, 41)); 1339 Expected = ConstantRange(APInt(16, 0), APInt(16, 20)); 1340 EXPECT_EQ(PosLargeLHS.srem(PosMod), Expected); 1341 EXPECT_EQ(PosLargeLHS.srem(NegMod), Expected); 1342 ConstantRange NegLargeLHS(APInt(16, -40), APInt(16, 1)); 1343 Expected = ConstantRange(APInt(16, -19), APInt(16, 1)); 1344 EXPECT_EQ(NegLargeLHS.srem(PosMod), Expected); 1345 EXPECT_EQ(NegLargeLHS.srem(NegMod), Expected); 1346 ConstantRange PosNegLargeLHS(APInt(16, -32), APInt(16, 38)); 1347 Expected = ConstantRange(APInt(16, -19), APInt(16, 20)); 1348 EXPECT_EQ(PosNegLargeLHS.srem(PosMod), Expected); 1349 EXPECT_EQ(PosNegLargeLHS.srem(NegMod), Expected); 1350 1351 // srem is bounded by LHS. 1352 ConstantRange PosLHS(APInt(16, 0), APInt(16, 16)); 1353 EXPECT_EQ(PosLHS.srem(PosMod), PosLHS); 1354 EXPECT_EQ(PosLHS.srem(NegMod), PosLHS); 1355 EXPECT_EQ(PosLHS.srem(IntMinMod), PosLHS); 1356 ConstantRange NegLHS(APInt(16, -15), APInt(16, 1)); 1357 EXPECT_EQ(NegLHS.srem(PosMod), NegLHS); 1358 EXPECT_EQ(NegLHS.srem(NegMod), NegLHS); 1359 EXPECT_EQ(NegLHS.srem(IntMinMod), NegLHS); 1360 ConstantRange PosNegLHS(APInt(16, -12), APInt(16, 18)); 1361 EXPECT_EQ(PosNegLHS.srem(PosMod), PosNegLHS); 1362 EXPECT_EQ(PosNegLHS.srem(NegMod), PosNegLHS); 1363 EXPECT_EQ(PosNegLHS.srem(IntMinMod), PosNegLHS); 1364 1365 // srem is LHS if it is smaller than RHS. 1366 ConstantRange PosSmallLHS(APInt(16, 3), APInt(16, 8)); 1367 EXPECT_EQ(PosSmallLHS.srem(PosMod), PosSmallLHS); 1368 EXPECT_EQ(PosSmallLHS.srem(NegMod), PosSmallLHS); 1369 EXPECT_EQ(PosSmallLHS.srem(IntMinMod), PosSmallLHS); 1370 ConstantRange NegSmallLHS(APInt(16, -7), APInt(16, -2)); 1371 EXPECT_EQ(NegSmallLHS.srem(PosMod), NegSmallLHS); 1372 EXPECT_EQ(NegSmallLHS.srem(NegMod), NegSmallLHS); 1373 EXPECT_EQ(NegSmallLHS.srem(IntMinMod), NegSmallLHS); 1374 ConstantRange PosNegSmallLHS(APInt(16, -3), APInt(16, 8)); 1375 EXPECT_EQ(PosNegSmallLHS.srem(PosMod), PosNegSmallLHS); 1376 EXPECT_EQ(PosNegSmallLHS.srem(NegMod), PosNegSmallLHS); 1377 EXPECT_EQ(PosNegSmallLHS.srem(IntMinMod), PosNegSmallLHS); 1378 1379 // Example of a suboptimal result: 1380 // [12, 14] srem 10 is [2, 4], but we conservatively compute [0, 9]. 1381 EXPECT_EQ(ConstantRange(APInt(16, 12), APInt(16, 15)) 1382 .srem(ConstantRange(APInt(16, 10))), 1383 ConstantRange(APInt(16, 0), APInt(16, 10))); 1384 1385 TestBinaryOpExhaustive( 1386 [](const ConstantRange &CR1, const ConstantRange &CR2) { 1387 return CR1.srem(CR2); 1388 }, 1389 [](const APInt &N1, const APInt &N2) -> Optional<APInt> { 1390 if (N2.isZero()) 1391 return None; 1392 return N1.srem(N2); 1393 }, 1394 PreferSmallest, 1395 CheckSingleElementsOnly); 1396 } 1397 1398 TEST_F(ConstantRangeTest, Shl) { 1399 ConstantRange Some2(APInt(16, 0xfff), APInt(16, 0x8000)); 1400 ConstantRange WrapNullMax(APInt(16, 0x1), APInt(16, 0x0)); 1401 EXPECT_EQ(Full.shl(Full), Full); 1402 EXPECT_EQ(Full.shl(Empty), Empty); 1403 EXPECT_EQ(Full.shl(One), ConstantRange(APInt(16, 0), 1404 APInt(16, 0xfc00) + 1)); 1405 EXPECT_EQ(Full.shl(Some), Full); // TODO: [0, (-1 << 0xa) + 1) 1406 EXPECT_EQ(Full.shl(Wrap), Full); 1407 EXPECT_EQ(Empty.shl(Empty), Empty); 1408 EXPECT_EQ(Empty.shl(One), Empty); 1409 EXPECT_EQ(Empty.shl(Some), Empty); 1410 EXPECT_EQ(Empty.shl(Wrap), Empty); 1411 EXPECT_EQ(One.shl(One), ConstantRange(APInt(16, 0xa << 0xa), 1412 APInt(16, (0xa << 0xa) + 1))); 1413 EXPECT_EQ(One.shl(Some), Full); // TODO: [0xa << 0xa, 0) 1414 EXPECT_EQ(One.shl(Wrap), Full); // TODO: [0xa, 0xa << 14 + 1) 1415 EXPECT_EQ(Some.shl(Some), Full); // TODO: [0xa << 0xa, 0xfc01) 1416 EXPECT_EQ(Some.shl(Wrap), Full); // TODO: [0xa, 0x7ff << 0x5 + 1) 1417 EXPECT_EQ(Wrap.shl(Wrap), Full); 1418 EXPECT_EQ( 1419 Some2.shl(ConstantRange(APInt(16, 0x1))), 1420 ConstantRange(APInt(16, 0xfff << 0x1), APInt(16, 0x7fff << 0x1) + 1)); 1421 EXPECT_EQ(One.shl(WrapNullMax), Full); 1422 1423 TestBinaryOpExhaustive( 1424 [](const ConstantRange &CR1, const ConstantRange &CR2) { 1425 return CR1.shl(CR2); 1426 }, 1427 [](const APInt &N1, const APInt &N2) -> Optional<APInt> { 1428 if (N2.uge(N2.getBitWidth())) 1429 return None; 1430 return N1.shl(N2); 1431 }, 1432 PreferSmallestUnsigned, 1433 [](const ConstantRange &, const ConstantRange &CR2) { 1434 // We currently only produce precise results for single element RHS. 1435 return CR2.isSingleElement(); 1436 }); 1437 } 1438 1439 TEST_F(ConstantRangeTest, Lshr) { 1440 EXPECT_EQ(Full.lshr(Full), Full); 1441 EXPECT_EQ(Full.lshr(Empty), Empty); 1442 EXPECT_EQ(Full.lshr(One), ConstantRange(APInt(16, 0), 1443 APInt(16, (0xffff >> 0xa) + 1))); 1444 EXPECT_EQ(Full.lshr(Some), ConstantRange(APInt(16, 0), 1445 APInt(16, (0xffff >> 0xa) + 1))); 1446 EXPECT_EQ(Full.lshr(Wrap), Full); 1447 EXPECT_EQ(Empty.lshr(Empty), Empty); 1448 EXPECT_EQ(Empty.lshr(One), Empty); 1449 EXPECT_EQ(Empty.lshr(Some), Empty); 1450 EXPECT_EQ(Empty.lshr(Wrap), Empty); 1451 EXPECT_EQ(One.lshr(One), ConstantRange(APInt(16, 0))); 1452 EXPECT_EQ(One.lshr(Some), ConstantRange(APInt(16, 0))); 1453 EXPECT_EQ(One.lshr(Wrap), ConstantRange(APInt(16, 0), APInt(16, 0xb))); 1454 EXPECT_EQ(Some.lshr(Some), ConstantRange(APInt(16, 0), 1455 APInt(16, (0xaaa >> 0xa) + 1))); 1456 EXPECT_EQ(Some.lshr(Wrap), ConstantRange(APInt(16, 0), APInt(16, 0xaaa))); 1457 EXPECT_EQ(Wrap.lshr(Wrap), Full); 1458 } 1459 1460 TEST_F(ConstantRangeTest, Ashr) { 1461 EXPECT_EQ(Full.ashr(Full), Full); 1462 EXPECT_EQ(Full.ashr(Empty), Empty); 1463 EXPECT_EQ(Full.ashr(One), ConstantRange(APInt(16, 0xffe0), 1464 APInt(16, (0x7fff >> 0xa) + 1 ))); 1465 ConstantRange Small(APInt(16, 0xa), APInt(16, 0xb)); 1466 EXPECT_EQ(Full.ashr(Small), ConstantRange(APInt(16, 0xffe0), 1467 APInt(16, (0x7fff >> 0xa) + 1 ))); 1468 EXPECT_EQ(Full.ashr(Some), ConstantRange(APInt(16, 0xffe0), 1469 APInt(16, (0x7fff >> 0xa) + 1 ))); 1470 EXPECT_EQ(Full.ashr(Wrap), Full); 1471 EXPECT_EQ(Empty.ashr(Empty), Empty); 1472 EXPECT_EQ(Empty.ashr(One), Empty); 1473 EXPECT_EQ(Empty.ashr(Some), Empty); 1474 EXPECT_EQ(Empty.ashr(Wrap), Empty); 1475 EXPECT_EQ(One.ashr(One), ConstantRange(APInt(16, 0))); 1476 EXPECT_EQ(One.ashr(Some), ConstantRange(APInt(16, 0))); 1477 EXPECT_EQ(One.ashr(Wrap), ConstantRange(APInt(16, 0), APInt(16, 0xb))); 1478 EXPECT_EQ(Some.ashr(Some), ConstantRange(APInt(16, 0), 1479 APInt(16, (0xaaa >> 0xa) + 1))); 1480 EXPECT_EQ(Some.ashr(Wrap), ConstantRange(APInt(16, 0), APInt(16, 0xaaa))); 1481 EXPECT_EQ(Wrap.ashr(Wrap), Full); 1482 ConstantRange Neg(APInt(16, 0xf3f0, true), APInt(16, 0xf7f8, true)); 1483 EXPECT_EQ(Neg.ashr(Small), ConstantRange(APInt(16, 0xfffc, true), 1484 APInt(16, 0xfffe, true))); 1485 } 1486 1487 TEST(ConstantRange, MakeAllowedICmpRegion) { 1488 // PR8250 1489 ConstantRange SMax = ConstantRange(APInt::getSignedMaxValue(32)); 1490 EXPECT_TRUE(ConstantRange::makeAllowedICmpRegion(ICmpInst::ICMP_SGT, SMax) 1491 .isEmptySet()); 1492 } 1493 1494 TEST(ConstantRange, MakeSatisfyingICmpRegion) { 1495 ConstantRange LowHalf(APInt(8, 0), APInt(8, 128)); 1496 ConstantRange HighHalf(APInt(8, 128), APInt(8, 0)); 1497 ConstantRange EmptySet(8, /* isFullSet = */ false); 1498 1499 EXPECT_EQ(ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_NE, LowHalf), 1500 HighHalf); 1501 1502 EXPECT_EQ( 1503 ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_NE, HighHalf), 1504 LowHalf); 1505 1506 EXPECT_TRUE(ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_EQ, 1507 HighHalf).isEmptySet()); 1508 1509 ConstantRange UnsignedSample(APInt(8, 5), APInt(8, 200)); 1510 1511 EXPECT_EQ(ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_ULT, 1512 UnsignedSample), 1513 ConstantRange(APInt(8, 0), APInt(8, 5))); 1514 1515 EXPECT_EQ(ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_ULE, 1516 UnsignedSample), 1517 ConstantRange(APInt(8, 0), APInt(8, 6))); 1518 1519 EXPECT_EQ(ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_UGT, 1520 UnsignedSample), 1521 ConstantRange(APInt(8, 200), APInt(8, 0))); 1522 1523 EXPECT_EQ(ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_UGE, 1524 UnsignedSample), 1525 ConstantRange(APInt(8, 199), APInt(8, 0))); 1526 1527 ConstantRange SignedSample(APInt(8, -5), APInt(8, 5)); 1528 1529 EXPECT_EQ( 1530 ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_SLT, SignedSample), 1531 ConstantRange(APInt(8, -128), APInt(8, -5))); 1532 1533 EXPECT_EQ( 1534 ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_SLE, SignedSample), 1535 ConstantRange(APInt(8, -128), APInt(8, -4))); 1536 1537 EXPECT_EQ( 1538 ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_SGT, SignedSample), 1539 ConstantRange(APInt(8, 5), APInt(8, -128))); 1540 1541 EXPECT_EQ( 1542 ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_SGE, SignedSample), 1543 ConstantRange(APInt(8, 4), APInt(8, -128))); 1544 } 1545 1546 static bool icmp(CmpInst::Predicate Pred, const APInt &LHS, const APInt &RHS) { 1547 switch (Pred) { 1548 case CmpInst::Predicate::ICMP_EQ: 1549 return LHS.eq(RHS); 1550 case CmpInst::Predicate::ICMP_NE: 1551 return LHS.ne(RHS); 1552 case CmpInst::Predicate::ICMP_UGT: 1553 return LHS.ugt(RHS); 1554 case CmpInst::Predicate::ICMP_UGE: 1555 return LHS.uge(RHS); 1556 case CmpInst::Predicate::ICMP_ULT: 1557 return LHS.ult(RHS); 1558 case CmpInst::Predicate::ICMP_ULE: 1559 return LHS.ule(RHS); 1560 case CmpInst::Predicate::ICMP_SGT: 1561 return LHS.sgt(RHS); 1562 case CmpInst::Predicate::ICMP_SGE: 1563 return LHS.sge(RHS); 1564 case CmpInst::Predicate::ICMP_SLT: 1565 return LHS.slt(RHS); 1566 case CmpInst::Predicate::ICMP_SLE: 1567 return LHS.sle(RHS); 1568 default: 1569 llvm_unreachable("Not an ICmp predicate!"); 1570 } 1571 } 1572 1573 void ICmpTestImpl(CmpInst::Predicate Pred) { 1574 unsigned Bits = 4; 1575 EnumerateTwoConstantRanges( 1576 Bits, [&](const ConstantRange &CR1, const ConstantRange &CR2) { 1577 bool Exhaustive = true; 1578 ForeachNumInConstantRange(CR1, [&](const APInt &N1) { 1579 ForeachNumInConstantRange( 1580 CR2, [&](const APInt &N2) { Exhaustive &= icmp(Pred, N1, N2); }); 1581 }); 1582 EXPECT_EQ(CR1.icmp(Pred, CR2), Exhaustive); 1583 }); 1584 } 1585 1586 TEST(ConstantRange, ICmp) { 1587 for (auto Pred : seq_inclusive(CmpInst::Predicate::FIRST_ICMP_PREDICATE, 1588 CmpInst::Predicate::LAST_ICMP_PREDICATE)) 1589 ICmpTestImpl(Pred); 1590 } 1591 1592 TEST(ConstantRange, MakeGuaranteedNoWrapRegion) { 1593 const int IntMin4Bits = 8; 1594 const int IntMax4Bits = 7; 1595 typedef OverflowingBinaryOperator OBO; 1596 1597 for (int Const : {0, -1, -2, 1, 2, IntMin4Bits, IntMax4Bits}) { 1598 APInt C(4, Const, true /* = isSigned */); 1599 1600 auto NUWRegion = ConstantRange::makeGuaranteedNoWrapRegion( 1601 Instruction::Add, C, OBO::NoUnsignedWrap); 1602 1603 EXPECT_FALSE(NUWRegion.isEmptySet()); 1604 1605 auto NSWRegion = ConstantRange::makeGuaranteedNoWrapRegion( 1606 Instruction::Add, C, OBO::NoSignedWrap); 1607 1608 EXPECT_FALSE(NSWRegion.isEmptySet()); 1609 1610 for (APInt I = NUWRegion.getLower(), E = NUWRegion.getUpper(); I != E; 1611 ++I) { 1612 bool Overflow = false; 1613 (void)I.uadd_ov(C, Overflow); 1614 EXPECT_FALSE(Overflow); 1615 } 1616 1617 for (APInt I = NSWRegion.getLower(), E = NSWRegion.getUpper(); I != E; 1618 ++I) { 1619 bool Overflow = false; 1620 (void)I.sadd_ov(C, Overflow); 1621 EXPECT_FALSE(Overflow); 1622 } 1623 } 1624 1625 for (int Const : {0, -1, -2, 1, 2, IntMin4Bits, IntMax4Bits}) { 1626 APInt C(4, Const, true /* = isSigned */); 1627 1628 auto NUWRegion = ConstantRange::makeGuaranteedNoWrapRegion( 1629 Instruction::Sub, C, OBO::NoUnsignedWrap); 1630 1631 EXPECT_FALSE(NUWRegion.isEmptySet()); 1632 1633 auto NSWRegion = ConstantRange::makeGuaranteedNoWrapRegion( 1634 Instruction::Sub, C, OBO::NoSignedWrap); 1635 1636 EXPECT_FALSE(NSWRegion.isEmptySet()); 1637 1638 for (APInt I = NUWRegion.getLower(), E = NUWRegion.getUpper(); I != E; 1639 ++I) { 1640 bool Overflow = false; 1641 (void)I.usub_ov(C, Overflow); 1642 EXPECT_FALSE(Overflow); 1643 } 1644 1645 for (APInt I = NSWRegion.getLower(), E = NSWRegion.getUpper(); I != E; 1646 ++I) { 1647 bool Overflow = false; 1648 (void)I.ssub_ov(C, Overflow); 1649 EXPECT_FALSE(Overflow); 1650 } 1651 } 1652 1653 auto NSWForAllValues = ConstantRange::makeGuaranteedNoWrapRegion( 1654 Instruction::Add, ConstantRange(32, /* isFullSet = */ true), 1655 OBO::NoSignedWrap); 1656 EXPECT_TRUE(NSWForAllValues.isSingleElement() && 1657 NSWForAllValues.getSingleElement()->isMinValue()); 1658 1659 NSWForAllValues = ConstantRange::makeGuaranteedNoWrapRegion( 1660 Instruction::Sub, ConstantRange(32, /* isFullSet = */ true), 1661 OBO::NoSignedWrap); 1662 EXPECT_TRUE(NSWForAllValues.isSingleElement() && 1663 NSWForAllValues.getSingleElement()->isMaxValue()); 1664 1665 auto NUWForAllValues = ConstantRange::makeGuaranteedNoWrapRegion( 1666 Instruction::Add, ConstantRange(32, /* isFullSet = */ true), 1667 OBO::NoUnsignedWrap); 1668 EXPECT_TRUE(NUWForAllValues.isSingleElement() && 1669 NUWForAllValues.getSingleElement()->isMinValue()); 1670 1671 NUWForAllValues = ConstantRange::makeGuaranteedNoWrapRegion( 1672 Instruction::Sub, ConstantRange(32, /* isFullSet = */ true), 1673 OBO::NoUnsignedWrap); 1674 EXPECT_TRUE(NUWForAllValues.isSingleElement() && 1675 NUWForAllValues.getSingleElement()->isMaxValue()); 1676 1677 EXPECT_TRUE(ConstantRange::makeGuaranteedNoWrapRegion( 1678 Instruction::Add, APInt(32, 0), OBO::NoUnsignedWrap).isFullSet()); 1679 EXPECT_TRUE(ConstantRange::makeGuaranteedNoWrapRegion( 1680 Instruction::Add, APInt(32, 0), OBO::NoSignedWrap).isFullSet()); 1681 EXPECT_TRUE(ConstantRange::makeGuaranteedNoWrapRegion( 1682 Instruction::Sub, APInt(32, 0), OBO::NoUnsignedWrap).isFullSet()); 1683 EXPECT_TRUE(ConstantRange::makeGuaranteedNoWrapRegion( 1684 Instruction::Sub, APInt(32, 0), OBO::NoSignedWrap).isFullSet()); 1685 1686 ConstantRange OneToFive(APInt(32, 1), APInt(32, 6)); 1687 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1688 Instruction::Add, OneToFive, OBO::NoSignedWrap), 1689 ConstantRange(APInt::getSignedMinValue(32), 1690 APInt::getSignedMaxValue(32) - 4)); 1691 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1692 Instruction::Add, OneToFive, OBO::NoUnsignedWrap), 1693 ConstantRange(APInt::getMinValue(32), APInt::getMinValue(32) - 5)); 1694 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1695 Instruction::Sub, OneToFive, OBO::NoSignedWrap), 1696 ConstantRange(APInt::getSignedMinValue(32) + 5, 1697 APInt::getSignedMinValue(32))); 1698 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1699 Instruction::Sub, OneToFive, OBO::NoUnsignedWrap), 1700 ConstantRange(APInt::getMinValue(32) + 5, APInt::getMinValue(32))); 1701 1702 ConstantRange MinusFiveToMinusTwo(APInt(32, -5), APInt(32, -1)); 1703 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1704 Instruction::Add, MinusFiveToMinusTwo, OBO::NoSignedWrap), 1705 ConstantRange(APInt::getSignedMinValue(32) + 5, 1706 APInt::getSignedMinValue(32))); 1707 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1708 Instruction::Add, MinusFiveToMinusTwo, OBO::NoUnsignedWrap), 1709 ConstantRange(APInt(32, 0), APInt(32, 2))); 1710 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1711 Instruction::Sub, MinusFiveToMinusTwo, OBO::NoSignedWrap), 1712 ConstantRange(APInt::getSignedMinValue(32), 1713 APInt::getSignedMaxValue(32) - 4)); 1714 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1715 Instruction::Sub, MinusFiveToMinusTwo, OBO::NoUnsignedWrap), 1716 ConstantRange(APInt::getMaxValue(32) - 1, 1717 APInt::getMinValue(32))); 1718 1719 ConstantRange MinusOneToOne(APInt(32, -1), APInt(32, 2)); 1720 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1721 Instruction::Add, MinusOneToOne, OBO::NoSignedWrap), 1722 ConstantRange(APInt::getSignedMinValue(32) + 1, 1723 APInt::getSignedMinValue(32) - 1)); 1724 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1725 Instruction::Add, MinusOneToOne, OBO::NoUnsignedWrap), 1726 ConstantRange(APInt(32, 0), APInt(32, 1))); 1727 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1728 Instruction::Sub, MinusOneToOne, OBO::NoSignedWrap), 1729 ConstantRange(APInt::getSignedMinValue(32) + 1, 1730 APInt::getSignedMinValue(32) - 1)); 1731 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1732 Instruction::Sub, MinusOneToOne, OBO::NoUnsignedWrap), 1733 ConstantRange(APInt::getMaxValue(32), 1734 APInt::getMinValue(32))); 1735 1736 ConstantRange One(APInt(32, 1), APInt(32, 2)); 1737 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1738 Instruction::Add, One, OBO::NoSignedWrap), 1739 ConstantRange(APInt::getSignedMinValue(32), 1740 APInt::getSignedMaxValue(32))); 1741 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1742 Instruction::Add, One, OBO::NoUnsignedWrap), 1743 ConstantRange(APInt::getMinValue(32), APInt::getMaxValue(32))); 1744 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1745 Instruction::Sub, One, OBO::NoSignedWrap), 1746 ConstantRange(APInt::getSignedMinValue(32) + 1, 1747 APInt::getSignedMinValue(32))); 1748 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1749 Instruction::Sub, One, OBO::NoUnsignedWrap), 1750 ConstantRange(APInt::getMinValue(32) + 1, APInt::getMinValue(32))); 1751 1752 ConstantRange OneLessThanBitWidth(APInt(32, 0), APInt(32, 31) + 1); 1753 ConstantRange UpToBitWidth(APInt(32, 0), APInt(32, 32) + 1); 1754 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1755 Instruction::Shl, UpToBitWidth, OBO::NoUnsignedWrap), 1756 ConstantRange::makeGuaranteedNoWrapRegion( 1757 Instruction::Shl, OneLessThanBitWidth, OBO::NoUnsignedWrap)); 1758 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1759 Instruction::Shl, UpToBitWidth, OBO::NoSignedWrap), 1760 ConstantRange::makeGuaranteedNoWrapRegion( 1761 Instruction::Shl, OneLessThanBitWidth, OBO::NoSignedWrap)); 1762 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1763 Instruction::Shl, UpToBitWidth, OBO::NoUnsignedWrap), 1764 ConstantRange(APInt(32, 0), APInt(32, 1) + 1)); 1765 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1766 Instruction::Shl, UpToBitWidth, OBO::NoSignedWrap), 1767 ConstantRange(APInt(32, -1), APInt(32, 0) + 1)); 1768 1769 EXPECT_EQ( 1770 ConstantRange::makeGuaranteedNoWrapRegion( 1771 Instruction::Shl, ConstantRange::getFull(32), OBO::NoUnsignedWrap), 1772 ConstantRange::makeGuaranteedNoWrapRegion( 1773 Instruction::Shl, OneLessThanBitWidth, OBO::NoUnsignedWrap)); 1774 EXPECT_EQ( 1775 ConstantRange::makeGuaranteedNoWrapRegion( 1776 Instruction::Shl, ConstantRange::getFull(32), OBO::NoSignedWrap), 1777 ConstantRange::makeGuaranteedNoWrapRegion( 1778 Instruction::Shl, OneLessThanBitWidth, OBO::NoSignedWrap)); 1779 1780 ConstantRange IllegalShAmt(APInt(32, 32), APInt(32, 0) + 1); 1781 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1782 Instruction::Shl, IllegalShAmt, OBO::NoUnsignedWrap), 1783 ConstantRange::getFull(32)); 1784 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1785 Instruction::Shl, IllegalShAmt, OBO::NoSignedWrap), 1786 ConstantRange::getFull(32)); 1787 1788 EXPECT_EQ( 1789 ConstantRange::makeGuaranteedNoWrapRegion( 1790 Instruction::Shl, ConstantRange(APInt(32, -32), APInt(32, 16) + 1), 1791 OBO::NoUnsignedWrap), 1792 ConstantRange::makeGuaranteedNoWrapRegion( 1793 Instruction::Shl, ConstantRange(APInt(32, 0), APInt(32, 16) + 1), 1794 OBO::NoUnsignedWrap)); 1795 EXPECT_EQ( 1796 ConstantRange::makeGuaranteedNoWrapRegion( 1797 Instruction::Shl, ConstantRange(APInt(32, -32), APInt(32, 16) + 1), 1798 OBO::NoSignedWrap), 1799 ConstantRange::makeGuaranteedNoWrapRegion( 1800 Instruction::Shl, ConstantRange(APInt(32, 0), APInt(32, 16) + 1), 1801 OBO::NoSignedWrap)); 1802 1803 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1804 Instruction::Shl, 1805 ConstantRange(APInt(32, -32), APInt(32, 16) + 1), 1806 OBO::NoUnsignedWrap), 1807 ConstantRange(APInt(32, 0), APInt(32, 65535) + 1)); 1808 EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion( 1809 Instruction::Shl, 1810 ConstantRange(APInt(32, -32), APInt(32, 16) + 1), 1811 OBO::NoSignedWrap), 1812 ConstantRange(APInt(32, -32768), APInt(32, 32767) + 1)); 1813 } 1814 1815 template<typename Fn> 1816 void TestNoWrapRegionExhaustive(Instruction::BinaryOps BinOp, 1817 unsigned NoWrapKind, Fn OverflowFn) { 1818 unsigned Bits = 5; 1819 EnumerateConstantRanges(Bits, [&](const ConstantRange &CR) { 1820 if (CR.isEmptySet()) 1821 return; 1822 if (Instruction::isShift(BinOp) && CR.getUnsignedMax().uge(Bits)) 1823 return; 1824 1825 ConstantRange NoWrap = 1826 ConstantRange::makeGuaranteedNoWrapRegion(BinOp, CR, NoWrapKind); 1827 ConstantRange Full = ConstantRange::getFull(Bits); 1828 ForeachNumInConstantRange(Full, [&](const APInt &N1) { 1829 bool NoOverflow = true; 1830 bool Overflow = true; 1831 ForeachNumInConstantRange(CR, [&](const APInt &N2) { 1832 if (OverflowFn(N1, N2)) 1833 NoOverflow = false; 1834 else 1835 Overflow = false; 1836 }); 1837 EXPECT_EQ(NoOverflow, NoWrap.contains(N1)); 1838 1839 // The no-wrap range is exact for single-element ranges. 1840 if (CR.isSingleElement()) { 1841 EXPECT_EQ(Overflow, !NoWrap.contains(N1)); 1842 } 1843 }); 1844 }); 1845 } 1846 1847 // Show that makeGuaranteedNoWrapRegion() is maximal, and for single-element 1848 // ranges also exact. 1849 TEST(ConstantRange, NoWrapRegionExhaustive) { 1850 TestNoWrapRegionExhaustive( 1851 Instruction::Add, OverflowingBinaryOperator::NoUnsignedWrap, 1852 [](const APInt &N1, const APInt &N2) { 1853 bool Overflow; 1854 (void) N1.uadd_ov(N2, Overflow); 1855 return Overflow; 1856 }); 1857 TestNoWrapRegionExhaustive( 1858 Instruction::Add, OverflowingBinaryOperator::NoSignedWrap, 1859 [](const APInt &N1, const APInt &N2) { 1860 bool Overflow; 1861 (void) N1.sadd_ov(N2, Overflow); 1862 return Overflow; 1863 }); 1864 TestNoWrapRegionExhaustive( 1865 Instruction::Sub, OverflowingBinaryOperator::NoUnsignedWrap, 1866 [](const APInt &N1, const APInt &N2) { 1867 bool Overflow; 1868 (void) N1.usub_ov(N2, Overflow); 1869 return Overflow; 1870 }); 1871 TestNoWrapRegionExhaustive( 1872 Instruction::Sub, OverflowingBinaryOperator::NoSignedWrap, 1873 [](const APInt &N1, const APInt &N2) { 1874 bool Overflow; 1875 (void) N1.ssub_ov(N2, Overflow); 1876 return Overflow; 1877 }); 1878 TestNoWrapRegionExhaustive( 1879 Instruction::Mul, OverflowingBinaryOperator::NoUnsignedWrap, 1880 [](const APInt &N1, const APInt &N2) { 1881 bool Overflow; 1882 (void) N1.umul_ov(N2, Overflow); 1883 return Overflow; 1884 }); 1885 TestNoWrapRegionExhaustive( 1886 Instruction::Mul, OverflowingBinaryOperator::NoSignedWrap, 1887 [](const APInt &N1, const APInt &N2) { 1888 bool Overflow; 1889 (void) N1.smul_ov(N2, Overflow); 1890 return Overflow; 1891 }); 1892 TestNoWrapRegionExhaustive(Instruction::Shl, 1893 OverflowingBinaryOperator::NoUnsignedWrap, 1894 [](const APInt &N1, const APInt &N2) { 1895 bool Overflow; 1896 (void)N1.ushl_ov(N2, Overflow); 1897 return Overflow; 1898 }); 1899 TestNoWrapRegionExhaustive(Instruction::Shl, 1900 OverflowingBinaryOperator::NoSignedWrap, 1901 [](const APInt &N1, const APInt &N2) { 1902 bool Overflow; 1903 (void)N1.sshl_ov(N2, Overflow); 1904 return Overflow; 1905 }); 1906 } 1907 1908 TEST(ConstantRange, GetEquivalentICmp) { 1909 APInt RHS; 1910 CmpInst::Predicate Pred; 1911 1912 EXPECT_TRUE(ConstantRange(APInt::getMinValue(32), APInt(32, 100)) 1913 .getEquivalentICmp(Pred, RHS)); 1914 EXPECT_EQ(Pred, CmpInst::ICMP_ULT); 1915 EXPECT_EQ(RHS, APInt(32, 100)); 1916 1917 EXPECT_TRUE(ConstantRange(APInt::getSignedMinValue(32), APInt(32, 100)) 1918 .getEquivalentICmp(Pred, RHS)); 1919 EXPECT_EQ(Pred, CmpInst::ICMP_SLT); 1920 EXPECT_EQ(RHS, APInt(32, 100)); 1921 1922 EXPECT_TRUE(ConstantRange(APInt(32, 100), APInt::getMinValue(32)) 1923 .getEquivalentICmp(Pred, RHS)); 1924 EXPECT_EQ(Pred, CmpInst::ICMP_UGE); 1925 EXPECT_EQ(RHS, APInt(32, 100)); 1926 1927 EXPECT_TRUE(ConstantRange(APInt(32, 100), APInt::getSignedMinValue(32)) 1928 .getEquivalentICmp(Pred, RHS)); 1929 EXPECT_EQ(Pred, CmpInst::ICMP_SGE); 1930 EXPECT_EQ(RHS, APInt(32, 100)); 1931 1932 EXPECT_TRUE( 1933 ConstantRange(32, /*isFullSet=*/true).getEquivalentICmp(Pred, RHS)); 1934 EXPECT_EQ(Pred, CmpInst::ICMP_UGE); 1935 EXPECT_EQ(RHS, APInt(32, 0)); 1936 1937 EXPECT_TRUE( 1938 ConstantRange(32, /*isFullSet=*/false).getEquivalentICmp(Pred, RHS)); 1939 EXPECT_EQ(Pred, CmpInst::ICMP_ULT); 1940 EXPECT_EQ(RHS, APInt(32, 0)); 1941 1942 EXPECT_FALSE(ConstantRange(APInt(32, 100), APInt(32, 200)) 1943 .getEquivalentICmp(Pred, RHS)); 1944 1945 EXPECT_FALSE(ConstantRange(APInt::getSignedMinValue(32) - APInt(32, 100), 1946 APInt::getSignedMinValue(32) + APInt(32, 100)) 1947 .getEquivalentICmp(Pred, RHS)); 1948 1949 EXPECT_FALSE(ConstantRange(APInt::getMinValue(32) - APInt(32, 100), 1950 APInt::getMinValue(32) + APInt(32, 100)) 1951 .getEquivalentICmp(Pred, RHS)); 1952 1953 EXPECT_TRUE(ConstantRange(APInt(32, 100)).getEquivalentICmp(Pred, RHS)); 1954 EXPECT_EQ(Pred, CmpInst::ICMP_EQ); 1955 EXPECT_EQ(RHS, APInt(32, 100)); 1956 1957 EXPECT_TRUE( 1958 ConstantRange(APInt(32, 100)).inverse().getEquivalentICmp(Pred, RHS)); 1959 EXPECT_EQ(Pred, CmpInst::ICMP_NE); 1960 EXPECT_EQ(RHS, APInt(32, 100)); 1961 1962 EXPECT_TRUE( 1963 ConstantRange(APInt(512, 100)).inverse().getEquivalentICmp(Pred, RHS)); 1964 EXPECT_EQ(Pred, CmpInst::ICMP_NE); 1965 EXPECT_EQ(RHS, APInt(512, 100)); 1966 1967 // NB! It would be correct for the following four calls to getEquivalentICmp 1968 // to return ordered predicates like CmpInst::ICMP_ULT or CmpInst::ICMP_UGT. 1969 // However, that's not the case today. 1970 1971 EXPECT_TRUE(ConstantRange(APInt(32, 0)).getEquivalentICmp(Pred, RHS)); 1972 EXPECT_EQ(Pred, CmpInst::ICMP_EQ); 1973 EXPECT_EQ(RHS, APInt(32, 0)); 1974 1975 EXPECT_TRUE( 1976 ConstantRange(APInt(32, 0)).inverse().getEquivalentICmp(Pred, RHS)); 1977 EXPECT_EQ(Pred, CmpInst::ICMP_NE); 1978 EXPECT_EQ(RHS, APInt(32, 0)); 1979 1980 EXPECT_TRUE(ConstantRange(APInt(32, -1)).getEquivalentICmp(Pred, RHS)); 1981 EXPECT_EQ(Pred, CmpInst::ICMP_EQ); 1982 EXPECT_EQ(RHS, APInt(32, -1)); 1983 1984 EXPECT_TRUE( 1985 ConstantRange(APInt(32, -1)).inverse().getEquivalentICmp(Pred, RHS)); 1986 EXPECT_EQ(Pred, CmpInst::ICMP_NE); 1987 EXPECT_EQ(RHS, APInt(32, -1)); 1988 } 1989 1990 #define EXPECT_MAY_OVERFLOW(op) \ 1991 EXPECT_EQ(ConstantRange::OverflowResult::MayOverflow, (op)) 1992 #define EXPECT_ALWAYS_OVERFLOWS_LOW(op) \ 1993 EXPECT_EQ(ConstantRange::OverflowResult::AlwaysOverflowsLow, (op)) 1994 #define EXPECT_ALWAYS_OVERFLOWS_HIGH(op) \ 1995 EXPECT_EQ(ConstantRange::OverflowResult::AlwaysOverflowsHigh, (op)) 1996 #define EXPECT_NEVER_OVERFLOWS(op) \ 1997 EXPECT_EQ(ConstantRange::OverflowResult::NeverOverflows, (op)) 1998 1999 TEST_F(ConstantRangeTest, UnsignedAddOverflow) { 2000 // Ill-defined - may overflow is a conservative result. 2001 EXPECT_MAY_OVERFLOW(Some.unsignedAddMayOverflow(Empty)); 2002 EXPECT_MAY_OVERFLOW(Empty.unsignedAddMayOverflow(Some)); 2003 2004 // Never overflow despite one full/wrap set. 2005 ConstantRange Zero(APInt::getZero(16)); 2006 EXPECT_NEVER_OVERFLOWS(Full.unsignedAddMayOverflow(Zero)); 2007 EXPECT_NEVER_OVERFLOWS(Wrap.unsignedAddMayOverflow(Zero)); 2008 EXPECT_NEVER_OVERFLOWS(Zero.unsignedAddMayOverflow(Full)); 2009 EXPECT_NEVER_OVERFLOWS(Zero.unsignedAddMayOverflow(Wrap)); 2010 2011 // But usually full/wrap always may overflow. 2012 EXPECT_MAY_OVERFLOW(Full.unsignedAddMayOverflow(One)); 2013 EXPECT_MAY_OVERFLOW(Wrap.unsignedAddMayOverflow(One)); 2014 EXPECT_MAY_OVERFLOW(One.unsignedAddMayOverflow(Full)); 2015 EXPECT_MAY_OVERFLOW(One.unsignedAddMayOverflow(Wrap)); 2016 2017 ConstantRange A(APInt(16, 0xfd00), APInt(16, 0xfe00)); 2018 ConstantRange B1(APInt(16, 0x0100), APInt(16, 0x0201)); 2019 ConstantRange B2(APInt(16, 0x0100), APInt(16, 0x0202)); 2020 EXPECT_NEVER_OVERFLOWS(A.unsignedAddMayOverflow(B1)); 2021 EXPECT_MAY_OVERFLOW(A.unsignedAddMayOverflow(B2)); 2022 EXPECT_NEVER_OVERFLOWS(B1.unsignedAddMayOverflow(A)); 2023 EXPECT_MAY_OVERFLOW(B2.unsignedAddMayOverflow(A)); 2024 2025 ConstantRange C1(APInt(16, 0x0299), APInt(16, 0x0400)); 2026 ConstantRange C2(APInt(16, 0x0300), APInt(16, 0x0400)); 2027 EXPECT_MAY_OVERFLOW(A.unsignedAddMayOverflow(C1)); 2028 EXPECT_ALWAYS_OVERFLOWS_HIGH(A.unsignedAddMayOverflow(C2)); 2029 EXPECT_MAY_OVERFLOW(C1.unsignedAddMayOverflow(A)); 2030 EXPECT_ALWAYS_OVERFLOWS_HIGH(C2.unsignedAddMayOverflow(A)); 2031 } 2032 2033 TEST_F(ConstantRangeTest, UnsignedSubOverflow) { 2034 // Ill-defined - may overflow is a conservative result. 2035 EXPECT_MAY_OVERFLOW(Some.unsignedSubMayOverflow(Empty)); 2036 EXPECT_MAY_OVERFLOW(Empty.unsignedSubMayOverflow(Some)); 2037 2038 // Never overflow despite one full/wrap set. 2039 ConstantRange Zero(APInt::getZero(16)); 2040 ConstantRange Max(APInt::getAllOnes(16)); 2041 EXPECT_NEVER_OVERFLOWS(Full.unsignedSubMayOverflow(Zero)); 2042 EXPECT_NEVER_OVERFLOWS(Wrap.unsignedSubMayOverflow(Zero)); 2043 EXPECT_NEVER_OVERFLOWS(Max.unsignedSubMayOverflow(Full)); 2044 EXPECT_NEVER_OVERFLOWS(Max.unsignedSubMayOverflow(Wrap)); 2045 2046 // But usually full/wrap always may overflow. 2047 EXPECT_MAY_OVERFLOW(Full.unsignedSubMayOverflow(One)); 2048 EXPECT_MAY_OVERFLOW(Wrap.unsignedSubMayOverflow(One)); 2049 EXPECT_MAY_OVERFLOW(One.unsignedSubMayOverflow(Full)); 2050 EXPECT_MAY_OVERFLOW(One.unsignedSubMayOverflow(Wrap)); 2051 2052 ConstantRange A(APInt(16, 0x0000), APInt(16, 0x0100)); 2053 ConstantRange B(APInt(16, 0x0100), APInt(16, 0x0200)); 2054 EXPECT_NEVER_OVERFLOWS(B.unsignedSubMayOverflow(A)); 2055 EXPECT_ALWAYS_OVERFLOWS_LOW(A.unsignedSubMayOverflow(B)); 2056 2057 ConstantRange A1(APInt(16, 0x0000), APInt(16, 0x0101)); 2058 ConstantRange B1(APInt(16, 0x0100), APInt(16, 0x0201)); 2059 EXPECT_NEVER_OVERFLOWS(B1.unsignedSubMayOverflow(A1)); 2060 EXPECT_MAY_OVERFLOW(A1.unsignedSubMayOverflow(B1)); 2061 2062 ConstantRange A2(APInt(16, 0x0000), APInt(16, 0x0102)); 2063 ConstantRange B2(APInt(16, 0x0100), APInt(16, 0x0202)); 2064 EXPECT_MAY_OVERFLOW(B2.unsignedSubMayOverflow(A2)); 2065 EXPECT_MAY_OVERFLOW(A2.unsignedSubMayOverflow(B2)); 2066 } 2067 2068 TEST_F(ConstantRangeTest, SignedAddOverflow) { 2069 // Ill-defined - may overflow is a conservative result. 2070 EXPECT_MAY_OVERFLOW(Some.signedAddMayOverflow(Empty)); 2071 EXPECT_MAY_OVERFLOW(Empty.signedAddMayOverflow(Some)); 2072 2073 // Never overflow despite one full/wrap set. 2074 ConstantRange Zero(APInt::getZero(16)); 2075 EXPECT_NEVER_OVERFLOWS(Full.signedAddMayOverflow(Zero)); 2076 EXPECT_NEVER_OVERFLOWS(Wrap.signedAddMayOverflow(Zero)); 2077 EXPECT_NEVER_OVERFLOWS(Zero.signedAddMayOverflow(Full)); 2078 EXPECT_NEVER_OVERFLOWS(Zero.signedAddMayOverflow(Wrap)); 2079 2080 // But usually full/wrap always may overflow. 2081 EXPECT_MAY_OVERFLOW(Full.signedAddMayOverflow(One)); 2082 EXPECT_MAY_OVERFLOW(Wrap.signedAddMayOverflow(One)); 2083 EXPECT_MAY_OVERFLOW(One.signedAddMayOverflow(Full)); 2084 EXPECT_MAY_OVERFLOW(One.signedAddMayOverflow(Wrap)); 2085 2086 ConstantRange A(APInt(16, 0x7d00), APInt(16, 0x7e00)); 2087 ConstantRange B1(APInt(16, 0x0100), APInt(16, 0x0201)); 2088 ConstantRange B2(APInt(16, 0x0100), APInt(16, 0x0202)); 2089 EXPECT_NEVER_OVERFLOWS(A.signedAddMayOverflow(B1)); 2090 EXPECT_MAY_OVERFLOW(A.signedAddMayOverflow(B2)); 2091 ConstantRange B3(APInt(16, 0x8000), APInt(16, 0x0201)); 2092 ConstantRange B4(APInt(16, 0x8000), APInt(16, 0x0202)); 2093 EXPECT_NEVER_OVERFLOWS(A.signedAddMayOverflow(B3)); 2094 EXPECT_MAY_OVERFLOW(A.signedAddMayOverflow(B4)); 2095 ConstantRange B5(APInt(16, 0x0299), APInt(16, 0x0400)); 2096 ConstantRange B6(APInt(16, 0x0300), APInt(16, 0x0400)); 2097 EXPECT_MAY_OVERFLOW(A.signedAddMayOverflow(B5)); 2098 EXPECT_ALWAYS_OVERFLOWS_HIGH(A.signedAddMayOverflow(B6)); 2099 2100 ConstantRange C(APInt(16, 0x8200), APInt(16, 0x8300)); 2101 ConstantRange D1(APInt(16, 0xfe00), APInt(16, 0xff00)); 2102 ConstantRange D2(APInt(16, 0xfd99), APInt(16, 0xff00)); 2103 EXPECT_NEVER_OVERFLOWS(C.signedAddMayOverflow(D1)); 2104 EXPECT_MAY_OVERFLOW(C.signedAddMayOverflow(D2)); 2105 ConstantRange D3(APInt(16, 0xfe00), APInt(16, 0x8000)); 2106 ConstantRange D4(APInt(16, 0xfd99), APInt(16, 0x8000)); 2107 EXPECT_NEVER_OVERFLOWS(C.signedAddMayOverflow(D3)); 2108 EXPECT_MAY_OVERFLOW(C.signedAddMayOverflow(D4)); 2109 ConstantRange D5(APInt(16, 0xfc00), APInt(16, 0xfd02)); 2110 ConstantRange D6(APInt(16, 0xfc00), APInt(16, 0xfd01)); 2111 EXPECT_MAY_OVERFLOW(C.signedAddMayOverflow(D5)); 2112 EXPECT_ALWAYS_OVERFLOWS_LOW(C.signedAddMayOverflow(D6)); 2113 2114 ConstantRange E(APInt(16, 0xff00), APInt(16, 0x0100)); 2115 EXPECT_NEVER_OVERFLOWS(E.signedAddMayOverflow(E)); 2116 ConstantRange F(APInt(16, 0xf000), APInt(16, 0x7000)); 2117 EXPECT_MAY_OVERFLOW(F.signedAddMayOverflow(F)); 2118 } 2119 2120 TEST_F(ConstantRangeTest, SignedSubOverflow) { 2121 // Ill-defined - may overflow is a conservative result. 2122 EXPECT_MAY_OVERFLOW(Some.signedSubMayOverflow(Empty)); 2123 EXPECT_MAY_OVERFLOW(Empty.signedSubMayOverflow(Some)); 2124 2125 // Never overflow despite one full/wrap set. 2126 ConstantRange Zero(APInt::getZero(16)); 2127 EXPECT_NEVER_OVERFLOWS(Full.signedSubMayOverflow(Zero)); 2128 EXPECT_NEVER_OVERFLOWS(Wrap.signedSubMayOverflow(Zero)); 2129 2130 // But usually full/wrap always may overflow. 2131 EXPECT_MAY_OVERFLOW(Full.signedSubMayOverflow(One)); 2132 EXPECT_MAY_OVERFLOW(Wrap.signedSubMayOverflow(One)); 2133 EXPECT_MAY_OVERFLOW(One.signedSubMayOverflow(Full)); 2134 EXPECT_MAY_OVERFLOW(One.signedSubMayOverflow(Wrap)); 2135 2136 ConstantRange A(APInt(16, 0x7d00), APInt(16, 0x7e00)); 2137 ConstantRange B1(APInt(16, 0xfe00), APInt(16, 0xff00)); 2138 ConstantRange B2(APInt(16, 0xfd99), APInt(16, 0xff00)); 2139 EXPECT_NEVER_OVERFLOWS(A.signedSubMayOverflow(B1)); 2140 EXPECT_MAY_OVERFLOW(A.signedSubMayOverflow(B2)); 2141 ConstantRange B3(APInt(16, 0xfc00), APInt(16, 0xfd02)); 2142 ConstantRange B4(APInt(16, 0xfc00), APInt(16, 0xfd01)); 2143 EXPECT_MAY_OVERFLOW(A.signedSubMayOverflow(B3)); 2144 EXPECT_ALWAYS_OVERFLOWS_HIGH(A.signedSubMayOverflow(B4)); 2145 2146 ConstantRange C(APInt(16, 0x8200), APInt(16, 0x8300)); 2147 ConstantRange D1(APInt(16, 0x0100), APInt(16, 0x0201)); 2148 ConstantRange D2(APInt(16, 0x0100), APInt(16, 0x0202)); 2149 EXPECT_NEVER_OVERFLOWS(C.signedSubMayOverflow(D1)); 2150 EXPECT_MAY_OVERFLOW(C.signedSubMayOverflow(D2)); 2151 ConstantRange D3(APInt(16, 0x0299), APInt(16, 0x0400)); 2152 ConstantRange D4(APInt(16, 0x0300), APInt(16, 0x0400)); 2153 EXPECT_MAY_OVERFLOW(C.signedSubMayOverflow(D3)); 2154 EXPECT_ALWAYS_OVERFLOWS_LOW(C.signedSubMayOverflow(D4)); 2155 2156 ConstantRange E(APInt(16, 0xff00), APInt(16, 0x0100)); 2157 EXPECT_NEVER_OVERFLOWS(E.signedSubMayOverflow(E)); 2158 ConstantRange F(APInt(16, 0xf000), APInt(16, 0x7001)); 2159 EXPECT_MAY_OVERFLOW(F.signedSubMayOverflow(F)); 2160 } 2161 2162 template<typename Fn1, typename Fn2> 2163 static void TestOverflowExhaustive(Fn1 OverflowFn, Fn2 MayOverflowFn) { 2164 // Constant range overflow checks are tested exhaustively on 4-bit numbers. 2165 unsigned Bits = 4; 2166 EnumerateTwoConstantRanges(Bits, [=](const ConstantRange &CR1, 2167 const ConstantRange &CR2) { 2168 // Loop over all N1 in CR1 and N2 in CR2 and check whether any of the 2169 // operations have overflow / have no overflow. 2170 bool RangeHasOverflowLow = false; 2171 bool RangeHasOverflowHigh = false; 2172 bool RangeHasNoOverflow = false; 2173 ForeachNumInConstantRange(CR1, [&](const APInt &N1) { 2174 ForeachNumInConstantRange(CR2, [&](const APInt &N2) { 2175 bool IsOverflowHigh; 2176 if (!OverflowFn(IsOverflowHigh, N1, N2)) { 2177 RangeHasNoOverflow = true; 2178 return; 2179 } 2180 2181 if (IsOverflowHigh) 2182 RangeHasOverflowHigh = true; 2183 else 2184 RangeHasOverflowLow = true; 2185 }); 2186 }); 2187 2188 ConstantRange::OverflowResult OR = MayOverflowFn(CR1, CR2); 2189 switch (OR) { 2190 case ConstantRange::OverflowResult::AlwaysOverflowsLow: 2191 EXPECT_TRUE(RangeHasOverflowLow); 2192 EXPECT_FALSE(RangeHasOverflowHigh); 2193 EXPECT_FALSE(RangeHasNoOverflow); 2194 break; 2195 case ConstantRange::OverflowResult::AlwaysOverflowsHigh: 2196 EXPECT_TRUE(RangeHasOverflowHigh); 2197 EXPECT_FALSE(RangeHasOverflowLow); 2198 EXPECT_FALSE(RangeHasNoOverflow); 2199 break; 2200 case ConstantRange::OverflowResult::NeverOverflows: 2201 EXPECT_FALSE(RangeHasOverflowLow); 2202 EXPECT_FALSE(RangeHasOverflowHigh); 2203 EXPECT_TRUE(RangeHasNoOverflow); 2204 break; 2205 case ConstantRange::OverflowResult::MayOverflow: 2206 // We return MayOverflow for empty sets as a conservative result, 2207 // but of course neither the RangeHasOverflow nor the 2208 // RangeHasNoOverflow flags will be set. 2209 if (CR1.isEmptySet() || CR2.isEmptySet()) 2210 break; 2211 2212 EXPECT_TRUE(RangeHasOverflowLow || RangeHasOverflowHigh); 2213 EXPECT_TRUE(RangeHasNoOverflow); 2214 break; 2215 } 2216 }); 2217 } 2218 2219 TEST_F(ConstantRangeTest, UnsignedAddOverflowExhaustive) { 2220 TestOverflowExhaustive( 2221 [](bool &IsOverflowHigh, const APInt &N1, const APInt &N2) { 2222 bool Overflow; 2223 (void) N1.uadd_ov(N2, Overflow); 2224 IsOverflowHigh = true; 2225 return Overflow; 2226 }, 2227 [](const ConstantRange &CR1, const ConstantRange &CR2) { 2228 return CR1.unsignedAddMayOverflow(CR2); 2229 }); 2230 } 2231 2232 TEST_F(ConstantRangeTest, UnsignedSubOverflowExhaustive) { 2233 TestOverflowExhaustive( 2234 [](bool &IsOverflowHigh, const APInt &N1, const APInt &N2) { 2235 bool Overflow; 2236 (void) N1.usub_ov(N2, Overflow); 2237 IsOverflowHigh = false; 2238 return Overflow; 2239 }, 2240 [](const ConstantRange &CR1, const ConstantRange &CR2) { 2241 return CR1.unsignedSubMayOverflow(CR2); 2242 }); 2243 } 2244 2245 TEST_F(ConstantRangeTest, UnsignedMulOverflowExhaustive) { 2246 TestOverflowExhaustive( 2247 [](bool &IsOverflowHigh, const APInt &N1, const APInt &N2) { 2248 bool Overflow; 2249 (void) N1.umul_ov(N2, Overflow); 2250 IsOverflowHigh = true; 2251 return Overflow; 2252 }, 2253 [](const ConstantRange &CR1, const ConstantRange &CR2) { 2254 return CR1.unsignedMulMayOverflow(CR2); 2255 }); 2256 } 2257 2258 TEST_F(ConstantRangeTest, SignedAddOverflowExhaustive) { 2259 TestOverflowExhaustive( 2260 [](bool &IsOverflowHigh, const APInt &N1, const APInt &N2) { 2261 bool Overflow; 2262 (void) N1.sadd_ov(N2, Overflow); 2263 IsOverflowHigh = N1.isNonNegative(); 2264 return Overflow; 2265 }, 2266 [](const ConstantRange &CR1, const ConstantRange &CR2) { 2267 return CR1.signedAddMayOverflow(CR2); 2268 }); 2269 } 2270 2271 TEST_F(ConstantRangeTest, SignedSubOverflowExhaustive) { 2272 TestOverflowExhaustive( 2273 [](bool &IsOverflowHigh, const APInt &N1, const APInt &N2) { 2274 bool Overflow; 2275 (void) N1.ssub_ov(N2, Overflow); 2276 IsOverflowHigh = N1.isNonNegative(); 2277 return Overflow; 2278 }, 2279 [](const ConstantRange &CR1, const ConstantRange &CR2) { 2280 return CR1.signedSubMayOverflow(CR2); 2281 }); 2282 } 2283 2284 TEST_F(ConstantRangeTest, FromKnownBits) { 2285 KnownBits Unknown(16); 2286 EXPECT_EQ(Full, ConstantRange::fromKnownBits(Unknown, /*signed*/false)); 2287 EXPECT_EQ(Full, ConstantRange::fromKnownBits(Unknown, /*signed*/true)); 2288 2289 // .10..01. -> unsigned 01000010 (66) to 11011011 (219) 2290 // -> signed 11000010 (194) to 01011011 (91) 2291 KnownBits Known(8); 2292 Known.Zero = 36; 2293 Known.One = 66; 2294 ConstantRange Unsigned(APInt(8, 66), APInt(8, 219 + 1)); 2295 ConstantRange Signed(APInt(8, 194), APInt(8, 91 + 1)); 2296 EXPECT_EQ(Unsigned, ConstantRange::fromKnownBits(Known, /*signed*/false)); 2297 EXPECT_EQ(Signed, ConstantRange::fromKnownBits(Known, /*signed*/true)); 2298 2299 // 1.10.10. -> 10100100 (164) to 11101101 (237) 2300 Known.Zero = 18; 2301 Known.One = 164; 2302 ConstantRange CR1(APInt(8, 164), APInt(8, 237 + 1)); 2303 EXPECT_EQ(CR1, ConstantRange::fromKnownBits(Known, /*signed*/false)); 2304 EXPECT_EQ(CR1, ConstantRange::fromKnownBits(Known, /*signed*/true)); 2305 2306 // 01.0.1.0 -> 01000100 (68) to 01101110 (110) 2307 Known.Zero = 145; 2308 Known.One = 68; 2309 ConstantRange CR2(APInt(8, 68), APInt(8, 110 + 1)); 2310 EXPECT_EQ(CR2, ConstantRange::fromKnownBits(Known, /*signed*/false)); 2311 EXPECT_EQ(CR2, ConstantRange::fromKnownBits(Known, /*signed*/true)); 2312 } 2313 2314 TEST_F(ConstantRangeTest, FromKnownBitsExhaustive) { 2315 unsigned Bits = 4; 2316 unsigned Max = 1 << Bits; 2317 KnownBits Known(Bits); 2318 for (unsigned Zero = 0; Zero < Max; ++Zero) { 2319 for (unsigned One = 0; One < Max; ++One) { 2320 Known.Zero = Zero; 2321 Known.One = One; 2322 if (Known.hasConflict() || Known.isUnknown()) 2323 continue; 2324 2325 UnsignedOpRangeGatherer UR(Bits); 2326 SignedOpRangeGatherer SR(Bits); 2327 for (unsigned N = 0; N < Max; ++N) { 2328 APInt Num(Bits, N); 2329 if ((Num & Known.Zero) != 0 || (~Num & Known.One) != 0) 2330 continue; 2331 2332 UR.account(Num); 2333 SR.account(Num); 2334 } 2335 2336 ConstantRange UnsignedCR = UR.getRange(); 2337 ConstantRange SignedCR = SR.getRange(); 2338 EXPECT_EQ(UnsignedCR, ConstantRange::fromKnownBits(Known, false)); 2339 EXPECT_EQ(SignedCR, ConstantRange::fromKnownBits(Known, true)); 2340 } 2341 } 2342 } 2343 2344 TEST_F(ConstantRangeTest, Negative) { 2345 // All elements in an empty set (of which there are none) are both negative 2346 // and non-negative. Empty & full sets checked explicitly for clarity, but 2347 // they are also covered by the exhaustive test below. 2348 EXPECT_TRUE(Empty.isAllNegative()); 2349 EXPECT_TRUE(Empty.isAllNonNegative()); 2350 EXPECT_FALSE(Full.isAllNegative()); 2351 EXPECT_FALSE(Full.isAllNonNegative()); 2352 2353 unsigned Bits = 4; 2354 EnumerateConstantRanges(Bits, [](const ConstantRange &CR) { 2355 bool AllNegative = true; 2356 bool AllNonNegative = true; 2357 ForeachNumInConstantRange(CR, [&](const APInt &N) { 2358 if (!N.isNegative()) 2359 AllNegative = false; 2360 if (!N.isNonNegative()) 2361 AllNonNegative = false; 2362 }); 2363 assert((CR.isEmptySet() || !AllNegative || !AllNonNegative) && 2364 "Only empty set can be both all negative and all non-negative"); 2365 2366 EXPECT_EQ(AllNegative, CR.isAllNegative()); 2367 EXPECT_EQ(AllNonNegative, CR.isAllNonNegative()); 2368 }); 2369 } 2370 2371 TEST_F(ConstantRangeTest, UAddSat) { 2372 TestBinaryOpExhaustive( 2373 [](const ConstantRange &CR1, const ConstantRange &CR2) { 2374 return CR1.uadd_sat(CR2); 2375 }, 2376 [](const APInt &N1, const APInt &N2) { 2377 return N1.uadd_sat(N2); 2378 }, 2379 PreferSmallestUnsigned); 2380 } 2381 2382 TEST_F(ConstantRangeTest, USubSat) { 2383 TestBinaryOpExhaustive( 2384 [](const ConstantRange &CR1, const ConstantRange &CR2) { 2385 return CR1.usub_sat(CR2); 2386 }, 2387 [](const APInt &N1, const APInt &N2) { 2388 return N1.usub_sat(N2); 2389 }, 2390 PreferSmallestUnsigned); 2391 } 2392 2393 TEST_F(ConstantRangeTest, UMulSat) { 2394 TestBinaryOpExhaustive( 2395 [](const ConstantRange &CR1, const ConstantRange &CR2) { 2396 return CR1.umul_sat(CR2); 2397 }, 2398 [](const APInt &N1, const APInt &N2) { return N1.umul_sat(N2); }, 2399 PreferSmallestUnsigned); 2400 } 2401 2402 TEST_F(ConstantRangeTest, UShlSat) { 2403 TestBinaryOpExhaustive( 2404 [](const ConstantRange &CR1, const ConstantRange &CR2) { 2405 return CR1.ushl_sat(CR2); 2406 }, 2407 [](const APInt &N1, const APInt &N2) { return N1.ushl_sat(N2); }, 2408 PreferSmallestUnsigned); 2409 } 2410 2411 TEST_F(ConstantRangeTest, SAddSat) { 2412 TestBinaryOpExhaustive( 2413 [](const ConstantRange &CR1, const ConstantRange &CR2) { 2414 return CR1.sadd_sat(CR2); 2415 }, 2416 [](const APInt &N1, const APInt &N2) { 2417 return N1.sadd_sat(N2); 2418 }, 2419 PreferSmallestSigned); 2420 } 2421 2422 TEST_F(ConstantRangeTest, SSubSat) { 2423 TestBinaryOpExhaustive( 2424 [](const ConstantRange &CR1, const ConstantRange &CR2) { 2425 return CR1.ssub_sat(CR2); 2426 }, 2427 [](const APInt &N1, const APInt &N2) { 2428 return N1.ssub_sat(N2); 2429 }, 2430 PreferSmallestSigned); 2431 } 2432 2433 TEST_F(ConstantRangeTest, SMulSat) { 2434 TestBinaryOpExhaustive( 2435 [](const ConstantRange &CR1, const ConstantRange &CR2) { 2436 return CR1.smul_sat(CR2); 2437 }, 2438 [](const APInt &N1, const APInt &N2) { return N1.smul_sat(N2); }, 2439 PreferSmallestSigned); 2440 } 2441 2442 TEST_F(ConstantRangeTest, SShlSat) { 2443 TestBinaryOpExhaustive( 2444 [](const ConstantRange &CR1, const ConstantRange &CR2) { 2445 return CR1.sshl_sat(CR2); 2446 }, 2447 [](const APInt &N1, const APInt &N2) { return N1.sshl_sat(N2); }, 2448 PreferSmallestSigned); 2449 } 2450 2451 TEST_F(ConstantRangeTest, Abs) { 2452 TestUnaryOpExhaustive( 2453 [](const ConstantRange &CR) { return CR.abs(); }, 2454 [](const APInt &N) { return N.abs(); }); 2455 2456 TestUnaryOpExhaustive( 2457 [](const ConstantRange &CR) { return CR.abs(/*IntMinIsPoison=*/true); }, 2458 [](const APInt &N) -> Optional<APInt> { 2459 if (N.isMinSignedValue()) 2460 return None; 2461 return N.abs(); 2462 }); 2463 } 2464 2465 TEST_F(ConstantRangeTest, castOps) { 2466 ConstantRange A(APInt(16, 66), APInt(16, 128)); 2467 ConstantRange FpToI8 = A.castOp(Instruction::FPToSI, 8); 2468 EXPECT_EQ(8u, FpToI8.getBitWidth()); 2469 EXPECT_TRUE(FpToI8.isFullSet()); 2470 2471 ConstantRange FpToI16 = A.castOp(Instruction::FPToSI, 16); 2472 EXPECT_EQ(16u, FpToI16.getBitWidth()); 2473 EXPECT_EQ(A, FpToI16); 2474 2475 ConstantRange FPExtToDouble = A.castOp(Instruction::FPExt, 64); 2476 EXPECT_EQ(64u, FPExtToDouble.getBitWidth()); 2477 EXPECT_TRUE(FPExtToDouble.isFullSet()); 2478 2479 ConstantRange PtrToInt = A.castOp(Instruction::PtrToInt, 64); 2480 EXPECT_EQ(64u, PtrToInt.getBitWidth()); 2481 EXPECT_TRUE(PtrToInt.isFullSet()); 2482 2483 ConstantRange IntToPtr = A.castOp(Instruction::IntToPtr, 64); 2484 EXPECT_EQ(64u, IntToPtr.getBitWidth()); 2485 EXPECT_TRUE(IntToPtr.isFullSet()); 2486 } 2487 2488 TEST_F(ConstantRangeTest, binaryXor) { 2489 // Single element ranges. 2490 ConstantRange R16(APInt(8, 16)); 2491 ConstantRange R20(APInt(8, 20)); 2492 EXPECT_EQ(*R16.binaryXor(R16).getSingleElement(), APInt(8, 0)); 2493 EXPECT_EQ(*R16.binaryXor(R20).getSingleElement(), APInt(8, 16 ^ 20)); 2494 2495 // Ranges with more than a single element. Handled conservatively for now. 2496 ConstantRange R16_35(APInt(8, 16), APInt(8, 35)); 2497 ConstantRange R0_99(APInt(8, 0), APInt(8, 99)); 2498 EXPECT_TRUE(R16_35.binaryXor(R16_35).isFullSet()); 2499 EXPECT_TRUE(R16_35.binaryXor(R0_99).isFullSet()); 2500 EXPECT_TRUE(R0_99.binaryXor(R16_35).isFullSet()); 2501 } 2502 2503 TEST_F(ConstantRangeTest, binaryNot) { 2504 TestUnaryOpExhaustive( 2505 [](const ConstantRange &CR) { return CR.binaryNot(); }, 2506 [](const APInt &N) { return ~N; }, 2507 PreferSmallest); 2508 TestUnaryOpExhaustive( 2509 [](const ConstantRange &CR) { 2510 return CR.binaryXor(ConstantRange(APInt::getAllOnes(CR.getBitWidth()))); 2511 }, 2512 [](const APInt &N) { return ~N; }, PreferSmallest); 2513 TestUnaryOpExhaustive( 2514 [](const ConstantRange &CR) { 2515 return ConstantRange(APInt::getAllOnes(CR.getBitWidth())).binaryXor(CR); 2516 }, 2517 [](const APInt &N) { return ~N; }, PreferSmallest); 2518 } 2519 2520 } // anonymous namespace 2521