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https://github.com/c64scene-ar/llvm-6502.git
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71 lines
2.0 KiB
LLVM
71 lines
2.0 KiB
LLVM
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; 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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%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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%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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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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%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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; 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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; 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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%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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