8b2f27ce3a
These simplifications were previously enabled only with isFast(), but that is more restrictive than required. Since r317488, FMF has 'reassoc' to control these cases at a finer level. llvm-svn: 330089
120 lines
4.0 KiB
LLVM
120 lines
4.0 KiB
LLVM
; RUN: opt < %s -reassociate -constprop -instcombine -S | FileCheck %s
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define float @test1(float %A, float %B) {
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; CHECK-LABEL: @test1(
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; CHECK-NEXT: [[W:%.*]] = fadd float %B, 5.000000e+00
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; CHECK-NEXT: [[X:%.*]] = fadd float %A, -7.000000e+00
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; CHECK-NEXT: [[Y:%.*]] = fsub float [[X]], [[W]]
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; CHECK-NEXT: [[Z:%.*]] = fadd float [[Y]], 1.200000e+01
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; CHECK-NEXT: ret float [[Z]]
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;
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%W = fadd float 5.0, %B
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%X = fadd float -7.0, %A
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%Y = fsub float %X, %W
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%Z = fadd float %Y, 12.0
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ret float %Z
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}
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; With sub reassociation, constant folding can eliminate all of the constants.
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define float @test2(float %A, float %B) {
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: [[Z:%.*]] = fsub fast float %A, %B
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; CHECK-NEXT: ret float [[Z]]
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;
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%W = fadd fast float %B, 5.000000e+00
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%X = fadd fast float %A, -7.000000e+00
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%Y = fsub fast float %X, %W
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%Z = fadd fast float %Y, 1.200000e+01
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ret float %Z
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}
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; Check again using minimal subset of FMF.
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; Both 'reassoc' and 'nsz' are required.
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define float @test2_minimal(float %A, float %B) {
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; CHECK-LABEL: @test2_minimal(
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; CHECK-NEXT: [[Z:%.*]] = fsub reassoc nsz float %A, %B
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; CHECK-NEXT: ret float [[Z]]
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;
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%W = fadd reassoc nsz float %B, 5.000000e+00
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%X = fadd reassoc nsz float %A, -7.000000e+00
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%Y = fsub reassoc nsz float %X, %W
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%Z = fadd reassoc nsz float %Y, 1.200000e+01
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ret float %Z
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}
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; Verify the fold is not done with only 'reassoc' ('nsz' is required).
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define float @test2_reassoc(float %A, float %B) {
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; CHECK-LABEL: @test2_reassoc(
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; CHECK-NEXT: [[W:%.*]] = fadd reassoc float %B, 5.000000e+00
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; CHECK-NEXT: [[X:%.*]] = fadd reassoc float %A, -7.000000e+00
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; CHECK-NEXT: [[Y:%.*]] = fsub reassoc float [[X]], [[W]]
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; CHECK-NEXT: [[Z:%.*]] = fadd reassoc float [[Y]], 1.200000e+01
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; CHECK-NEXT: ret float [[Z]]
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;
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%W = fadd reassoc float %B, 5.000000e+00
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%X = fadd reassoc float %A, -7.000000e+00
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%Y = fsub reassoc float %X, %W
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%Z = fadd reassoc float %Y, 1.200000e+01
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ret float %Z
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}
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define float @test3(float %A, float %B, float %C, float %D) {
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; CHECK-LABEL: @test3(
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; CHECK-NEXT: [[M:%.*]] = fadd float %A, 1.200000e+01
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; CHECK-NEXT: [[N:%.*]] = fadd float [[M]], %B
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; CHECK-NEXT: [[O:%.*]] = fadd float [[N]], %C
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; CHECK-NEXT: [[P:%.*]] = fsub float %D, [[O]]
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; CHECK-NEXT: [[Q:%.*]] = fadd float [[P]], 1.200000e+01
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; CHECK-NEXT: ret float [[Q]]
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;
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%M = fadd float %A, 1.200000e+01
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%N = fadd float %M, %B
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%O = fadd float %N, %C
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%P = fsub float %D, %O
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%Q = fadd float %P, 1.200000e+01
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ret float %Q
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}
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; With sub reassociation, constant folding can eliminate the two 12 constants.
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define float @test4(float %A, float %B, float %C, float %D) {
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; FIXME: InstCombine should be able to get us to the following:
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; %sum = fadd fast float %B, %A
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; %sum1 = fadd fast float %sum, %C
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; %Q = fsub fast float %D, %sum1
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; ret i32 %Q
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; CHECK-LABEL: @test4(
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; CHECK-NEXT: [[B_NEG:%.*]] = fsub fast float -0.000000e+00, %B
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; CHECK-NEXT: [[O_NEG:%.*]] = fsub fast float [[B_NEG]], %A
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; CHECK-NEXT: [[P:%.*]] = fsub fast float [[O_NEG]], %C
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; CHECK-NEXT: [[Q:%.*]] = fadd fast float [[P]], %D
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; CHECK-NEXT: ret float [[Q]]
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;
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%M = fadd fast float 1.200000e+01, %A
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%N = fadd fast float %M, %B
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%O = fadd fast float %N, %C
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%P = fsub fast float %D, %O
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%Q = fadd fast float 1.200000e+01, %P
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ret float %Q
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}
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; Check again using minimal subset of FMF.
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define float @test4_reassoc(float %A, float %B, float %C, float %D) {
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; CHECK-LABEL: @test4_reassoc(
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; CHECK-NEXT: [[M:%.*]] = fadd reassoc float %A, 1.200000e+01
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; CHECK-NEXT: [[N:%.*]] = fadd reassoc float [[M]], %B
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; CHECK-NEXT: [[O:%.*]] = fadd reassoc float [[N]], %C
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; CHECK-NEXT: [[P:%.*]] = fsub reassoc float %D, [[O]]
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; CHECK-NEXT: [[Q:%.*]] = fadd reassoc float [[P]], 1.200000e+01
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; CHECK-NEXT: ret float [[Q]]
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;
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%M = fadd reassoc float 1.200000e+01, %A
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%N = fadd reassoc float %M, %B
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%O = fadd reassoc float %N, %C
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%P = fsub reassoc float %D, %O
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%Q = fadd reassoc float 1.200000e+01, %P
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ret float %Q
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}
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