1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; 3; Test cases in this file are intended to be run with both reassociate and 4; instcombine passes enabled. 5; 6; Test numbering remains continuous across: 7; - InstCombine/fast-basictest.ll 8; - PhaseOrdering/fast-basictest.ll 9; - PhaseOrdering/fast-reassociate-gvn.ll 10; - Reassociate/fast-basictest.ll 11; 12; RUN: opt < %s -reassociate -instcombine -S | FileCheck %s --check-prefixes=CHECK,REASSOC_AND_IC --allow-unused-prefixes 13; RUN: opt < %s -O2 -S | FileCheck %s --check-prefixes=CHECK,O2 --allow-unused-prefixes 14 15; test2 ... test18 - both reassociate and instcombine passes 16; are required to perform a transform 17 18; ((a + (-3)) + b) + 3 -> a + b 19 20define float @test2(float %reg109, float %reg1111) { 21; CHECK-LABEL: @test2( 22; CHECK-NEXT: [[REG117:%.*]] = fadd fast float [[REG109:%.*]], [[REG1111:%.*]] 23; CHECK-NEXT: ret float [[REG117]] 24; 25 %reg115 = fadd fast float %reg109, -3.000000e+01 26 %reg116 = fadd fast float %reg115, %reg1111 27 %reg117 = fadd fast float %reg116, 3.000000e+01 28 ret float %reg117 29} 30 31; Verify that fold is not done without 'fast' 32define float @test2_no_FMF(float %reg109, float %reg1111) { 33; CHECK-LABEL: @test2_no_FMF( 34; CHECK-NEXT: [[REG115:%.*]] = fadd float [[REG109:%.*]], -3.000000e+01 35; CHECK-NEXT: [[REG116:%.*]] = fadd float [[REG115]], [[REG1111:%.*]] 36; CHECK-NEXT: [[REG117:%.*]] = fadd float [[REG116]], 3.000000e+01 37; CHECK-NEXT: ret float [[REG117]] 38; 39 %reg115 = fadd float %reg109, -3.000000e+01 40 %reg116 = fadd float %reg115, %reg1111 41 %reg117 = fadd float %reg116, 3.000000e+01 42 ret float %reg117 43} 44 45define float @test2_reassoc(float %reg109, float %reg1111) { 46; CHECK-LABEL: @test2_reassoc( 47; CHECK-NEXT: [[REG115:%.*]] = fadd reassoc float [[REG109:%.*]], -3.000000e+01 48; CHECK-NEXT: [[REG116:%.*]] = fadd reassoc float [[REG115]], [[REG1111:%.*]] 49; CHECK-NEXT: [[REG117:%.*]] = fadd reassoc float [[REG116]], 3.000000e+01 50; CHECK-NEXT: ret float [[REG117]] 51; 52 %reg115 = fadd reassoc float %reg109, -3.000000e+01 53 %reg116 = fadd reassoc float %reg115, %reg1111 54 %reg117 = fadd reassoc float %reg116, 3.000000e+01 55 ret float %reg117 56} 57 58; (x1 * 47) + (x2 * -47) => (x1 - x2) * 47 59 60define float @test13(float %X1, float %X2) { 61; CHECK-LABEL: @test13( 62; CHECK-NEXT: [[TMP1:%.*]] = fsub fast float [[X1:%.*]], [[X2:%.*]] 63; CHECK-NEXT: [[TMP2:%.*]] = fmul fast float [[TMP1]], 4.700000e+01 64; CHECK-NEXT: ret float [[TMP2]] 65; 66 %B = fmul fast float %X1, 47. ; X1*47 67 %C = fmul fast float %X2, -47. ; X2*-47 68 %D = fadd fast float %B, %C ; X1*47 + X2*-47 -> 47*(X1-X2) 69 ret float %D 70} 71 72; Check again with 'reassoc' and 'nsz' ('nsz' not technically required). 73define float @test13_reassoc_nsz(float %X1, float %X2) { 74; CHECK-LABEL: @test13_reassoc_nsz( 75; CHECK-NEXT: [[TMP1:%.*]] = fsub reassoc nsz float [[X1:%.*]], [[X2:%.*]] 76; CHECK-NEXT: [[TMP2:%.*]] = fmul reassoc nsz float [[TMP1]], 4.700000e+01 77; CHECK-NEXT: ret float [[TMP2]] 78; 79 %B = fmul reassoc nsz float %X1, 47. ; X1*47 80 %C = fmul reassoc nsz float %X2, -47. ; X2*-47 81 %D = fadd reassoc nsz float %B, %C ; X1*47 + X2*-47 -> 47*(X1-X2) 82 ret float %D 83} 84 85; TODO: This doesn't require 'nsz'. It should fold to ((x1 - x2) * 47.0) 86define float @test13_reassoc(float %X1, float %X2) { 87; CHECK-LABEL: @test13_reassoc( 88; CHECK-NEXT: [[B:%.*]] = fmul reassoc float [[X1:%.*]], 4.700000e+01 89; CHECK-NEXT: [[C:%.*]] = fmul reassoc float [[X2:%.*]], 4.700000e+01 90; CHECK-NEXT: [[TMP1:%.*]] = fsub reassoc float [[B]], [[C]] 91; CHECK-NEXT: ret float [[TMP1]] 92; 93 %B = fmul reassoc float %X1, 47. ; X1*47 94 %C = fmul reassoc float %X2, -47. ; X2*-47 95 %D = fadd reassoc float %B, %C ; X1*47 + X2*-47 -> 47*(X1-X2) 96 ret float %D 97} 98 99; (b+(a+1234))+-a -> b+1234 100 101define float @test15(float %b, float %a) { 102; CHECK-LABEL: @test15( 103; CHECK-NEXT: [[TMP1:%.*]] = fadd fast float [[B:%.*]], 1.234000e+03 104; CHECK-NEXT: ret float [[TMP1]] 105; 106 %1 = fadd fast float %a, 1234.0 107 %2 = fadd fast float %b, %1 108 %3 = fsub fast float 0.0, %a 109 %4 = fadd fast float %2, %3 110 ret float %4 111} 112 113define float @test15_unary_fneg(float %b, float %a) { 114; CHECK-LABEL: @test15_unary_fneg( 115; CHECK-NEXT: [[TMP1:%.*]] = fadd fast float [[B:%.*]], 1.234000e+03 116; CHECK-NEXT: ret float [[TMP1]] 117; 118 %1 = fadd fast float %a, 1234.0 119 %2 = fadd fast float %b, %1 120 %3 = fneg fast float %a 121 %4 = fadd fast float %2, %3 122 ret float %4 123} 124 125; TODO: check if it is possible to perform the optimization without 'fast' 126; with 'reassoc' and 'nsz' only. 127define float @test15_reassoc_nsz(float %b, float %a) { 128; CHECK-LABEL: @test15_reassoc_nsz( 129; CHECK-NEXT: [[TMP1:%.*]] = fadd reassoc nsz float [[A:%.*]], 1.234000e+03 130; CHECK-NEXT: [[TMP2:%.*]] = fadd reassoc nsz float [[TMP1]], [[B:%.*]] 131; CHECK-NEXT: [[TMP3:%.*]] = fsub reassoc nsz float [[TMP2]], [[A]] 132; CHECK-NEXT: ret float [[TMP3]] 133; 134 %1 = fadd reassoc nsz float %a, 1234.0 135 %2 = fadd reassoc nsz float %b, %1 136 %3 = fsub reassoc nsz float 0.0, %a 137 %4 = fadd reassoc nsz float %2, %3 138 ret float %4 139} 140 141define float @test15_reassoc(float %b, float %a) { 142; CHECK-LABEL: @test15_reassoc( 143; CHECK-NEXT: [[TMP1:%.*]] = fadd reassoc float [[A:%.*]], 1.234000e+03 144; CHECK-NEXT: [[TMP2:%.*]] = fadd reassoc float [[TMP1]], [[B:%.*]] 145; CHECK-NEXT: [[TMP3:%.*]] = fsub reassoc float 0.000000e+00, [[A]] 146; CHECK-NEXT: [[TMP4:%.*]] = fadd reassoc float [[TMP3]], [[TMP2]] 147; CHECK-NEXT: ret float [[TMP4]] 148; 149 %1 = fadd reassoc float %a, 1234.0 150 %2 = fadd reassoc float %b, %1 151 %3 = fsub reassoc float 0.0, %a 152 %4 = fadd reassoc float %2, %3 153 ret float %4 154} 155 156; Test that we can turn things like X*-(Y*Z) -> X*-1*Y*Z. 157 158define float @test16(float %a, float %b, float %z) { 159; REASSOC_AND_IC-LABEL: @test16( 160; REASSOC_AND_IC-NEXT: [[C:%.*]] = fmul fast float [[A:%.*]], 1.234500e+04 161; REASSOC_AND_IC-NEXT: [[E:%.*]] = fmul fast float [[C]], [[B:%.*]] 162; REASSOC_AND_IC-NEXT: [[F:%.*]] = fmul fast float [[E]], [[Z:%.*]] 163; REASSOC_AND_IC-NEXT: ret float [[F]] 164; 165; O2-LABEL: @test16( 166; O2-NEXT: [[D:%.*]] = fmul fast float [[A:%.*]], 1.234500e+04 167; O2-NEXT: [[E:%.*]] = fmul fast float [[D]], [[B:%.*]] 168; O2-NEXT: [[G:%.*]] = fmul fast float [[E]], [[Z:%.*]] 169; O2-NEXT: ret float [[G]] 170; 171 %c = fsub fast float 0.000000e+00, %z 172 %d = fmul fast float %a, %b 173 %e = fmul fast float %c, %d 174 %f = fmul fast float %e, 1.234500e+04 175 %g = fsub fast float 0.000000e+00, %f 176 ret float %g 177} 178 179define float @test16_unary_fneg(float %a, float %b, float %z) { 180; REASSOC_AND_IC-LABEL: @test16_unary_fneg( 181; REASSOC_AND_IC-NEXT: [[E:%.*]] = fmul fast float [[A:%.*]], 1.234500e+04 182; REASSOC_AND_IC-NEXT: [[F:%.*]] = fmul fast float [[E]], [[B:%.*]] 183; REASSOC_AND_IC-NEXT: [[G:%.*]] = fmul fast float [[F]], [[Z:%.*]] 184; REASSOC_AND_IC-NEXT: ret float [[G]] 185; 186; O2-LABEL: @test16_unary_fneg( 187; O2-NEXT: [[D:%.*]] = fmul fast float [[A:%.*]], 1.234500e+04 188; O2-NEXT: [[E:%.*]] = fmul fast float [[D]], [[B:%.*]] 189; O2-NEXT: [[G:%.*]] = fmul fast float [[E]], [[Z:%.*]] 190; O2-NEXT: ret float [[G]] 191; 192 %c = fneg fast float %z 193 %d = fmul fast float %a, %b 194 %e = fmul fast float %c, %d 195 %f = fmul fast float %e, 1.234500e+04 196 %g = fneg fast float %f 197 ret float %g 198} 199 200; TODO: check if it is possible to perform the optimization without 'fast' 201; with 'reassoc' and 'nsz' only. 202define float @test16_reassoc_nsz(float %a, float %b, float %z) { 203; CHECK-LABEL: @test16_reassoc_nsz( 204; CHECK-NEXT: [[C:%.*]] = fneg reassoc nsz float [[Z:%.*]] 205; CHECK-NEXT: [[D:%.*]] = fmul reassoc nsz float [[A:%.*]], [[B:%.*]] 206; CHECK-NEXT: [[E:%.*]] = fmul reassoc nsz float [[D]], [[C]] 207; CHECK-NEXT: [[G:%.*]] = fmul reassoc nsz float [[E]], -1.234500e+04 208; CHECK-NEXT: ret float [[G]] 209; 210 %c = fsub reassoc nsz float 0.000000e+00, %z 211 %d = fmul reassoc nsz float %a, %b 212 %e = fmul reassoc nsz float %c, %d 213 %f = fmul reassoc nsz float %e, 1.234500e+04 214 %g = fsub reassoc nsz float 0.000000e+00, %f 215 ret float %g 216} 217 218define float @test16_reassoc(float %a, float %b, float %z) { 219; CHECK-LABEL: @test16_reassoc( 220; CHECK-NEXT: [[C:%.*]] = fsub reassoc float 0.000000e+00, [[Z:%.*]] 221; CHECK-NEXT: [[D:%.*]] = fmul reassoc float [[A:%.*]], [[B:%.*]] 222; CHECK-NEXT: [[E:%.*]] = fmul reassoc float [[D]], [[C]] 223; CHECK-NEXT: [[F:%.*]] = fmul reassoc float [[E]], 1.234500e+04 224; CHECK-NEXT: [[G:%.*]] = fsub reassoc float 0.000000e+00, [[F]] 225; CHECK-NEXT: ret float [[G]] 226; 227 %c = fsub reassoc float 0.000000e+00, %z 228 %d = fmul reassoc float %a, %b 229 %e = fmul reassoc float %c, %d 230 %f = fmul reassoc float %e, 1.234500e+04 231 %g = fsub reassoc float 0.000000e+00, %f 232 ret float %g 233} 234 235; With sub reassociation, constant folding can eliminate the 12 and -12 constants. 236 237define float @test18(float %A, float %B) { 238; CHECK-LABEL: @test18( 239; CHECK-NEXT: [[Z:%.*]] = fsub fast float [[A:%.*]], [[B:%.*]] 240; CHECK-NEXT: ret float [[Z]] 241; 242 %X = fadd fast float -1.200000e+01, %A 243 %Y = fsub fast float %X, %B 244 %Z = fadd fast float %Y, 1.200000e+01 245 ret float %Z 246} 247 248define float @test18_reassoc(float %A, float %B) { 249; CHECK-LABEL: @test18_reassoc( 250; CHECK-NEXT: [[X:%.*]] = fadd reassoc float [[A:%.*]], -1.200000e+01 251; CHECK-NEXT: [[Y:%.*]] = fsub reassoc float [[X]], [[B:%.*]] 252; CHECK-NEXT: [[Z:%.*]] = fadd reassoc float [[Y]], 1.200000e+01 253; CHECK-NEXT: ret float [[Z]] 254; 255 %X = fadd reassoc float -1.200000e+01, %A 256 %Y = fsub reassoc float %X, %B 257 %Z = fadd reassoc float %Y, 1.200000e+01 258 ret float %Z 259} 260 261; test18 - check that the bug described in the revision does not appear: 262; https://reviews.llvm.org/D72521 263 264; With sub reassociation, constant folding can eliminate the uses of %a. 265 266define float @test19(float %a, float %b, float %c) nounwind { 267; REASSOC_AND_IC-LABEL: @test19( 268; REASSOC_AND_IC-NEXT: [[TMP1:%.*]] = fadd fast float [[B:%.*]], [[C:%.*]] 269; REASSOC_AND_IC-NEXT: [[T7:%.*]] = fneg fast float [[TMP1]] 270; REASSOC_AND_IC-NEXT: ret float [[T7]] 271; 272; O2-LABEL: @test19( 273; O2-NEXT: [[TMP1:%.*]] = fadd fast float [[C:%.*]], [[B:%.*]] 274; O2-NEXT: [[T7:%.*]] = fneg fast float [[TMP1]] 275; O2-NEXT: ret float [[T7]] 276; 277 %t3 = fsub fast float %a, %b 278 %t5 = fsub fast float %t3, %c 279 %t7 = fsub fast float %t5, %a 280 ret float %t7 281} 282 283define float @test19_reassoc_nsz(float %a, float %b, float %c) nounwind { 284; CHECK-LABEL: @test19_reassoc_nsz( 285; CHECK-NEXT: [[TMP1:%.*]] = fadd reassoc nsz float [[B:%.*]], [[C:%.*]] 286; CHECK-NEXT: [[T7:%.*]] = fneg reassoc nsz float [[TMP1]] 287; CHECK-NEXT: ret float [[T7]] 288; 289 %t3 = fsub reassoc nsz float %a, %b 290 %t5 = fsub reassoc nsz float %t3, %c 291 %t7 = fsub reassoc nsz float %t5, %a 292 ret float %t7 293} 294 295; Verify the fold is not done with only 'reassoc' ('nsz' is required). 296define float @test19_reassoc(float %a, float %b, float %c) nounwind { 297; CHECK-LABEL: @test19_reassoc( 298; CHECK-NEXT: [[T3:%.*]] = fsub reassoc float [[A:%.*]], [[B:%.*]] 299; CHECK-NEXT: [[T5:%.*]] = fsub reassoc float [[T3]], [[C:%.*]] 300; CHECK-NEXT: [[T7:%.*]] = fsub reassoc float [[T5]], [[A]] 301; CHECK-NEXT: ret float [[T7]] 302; 303 %t3 = fsub reassoc float %a, %b 304 %t5 = fsub reassoc float %t3, %c 305 %t7 = fsub reassoc float %t5, %a 306 ret float %t7 307} 308