mirror of
https://github.com/c64scene-ar/llvm-6502.git
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1e1446bf84
This logic hadn't been updated to handle FastMathFlags, and it took me a while to detect it because it doesn't show up in a simple search for CreateFAdd. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199629 91177308-0d34-0410-b5e6-96231b3b80d8
126 lines
3.4 KiB
LLVM
126 lines
3.4 KiB
LLVM
; RUN: opt -S -instcombine < %s | FileCheck %s
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; (-0.0 - X) * C => X * -C
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define float @test1(float %x) {
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%sub = fsub float -0.000000e+00, %x
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%mul = fmul float %sub, 2.0e+1
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ret float %mul
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; CHECK-LABEL: @test1(
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; CHECK: fmul float %x, -2.000000e+01
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}
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; (0.0 - X) * C => X * -C
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define float @test2(float %x) {
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%sub = fsub nsz float 0.000000e+00, %x
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%mul = fmul float %sub, 2.0e+1
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ret float %mul
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; CHECK-LABEL: @test2(
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; CHECK: fmul float %x, -2.000000e+01
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}
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; (-0.0 - X) * (-0.0 - Y) => X * Y
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define float @test3(float %x, float %y) {
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%sub1 = fsub float -0.000000e+00, %x
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%sub2 = fsub float -0.000000e+00, %y
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%mul = fmul fast float %sub1, %sub2
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ret float %mul
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; CHECK-LABEL: @test3(
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; CHECK: fmul fast float %x, %y
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}
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; (0.0 - X) * (0.0 - Y) => X * Y
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define float @test4(float %x, float %y) {
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%sub1 = fsub nsz float 0.000000e+00, %x
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%sub2 = fsub nsz float 0.000000e+00, %y
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%mul = fmul float %sub1, %sub2
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ret float %mul
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; CHECK-LABEL: @test4(
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; CHECK: fmul float %x, %y
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}
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; (-0.0 - X) * Y => -0.0 - (X * Y)
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define float @test5(float %x, float %y) {
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%sub1 = fsub float -0.000000e+00, %x
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%mul = fmul float %sub1, %y
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ret float %mul
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; CHECK-LABEL: @test5(
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; CHECK: %1 = fmul float %x, %y
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; CHECK: %mul = fsub float -0.000000e+00, %1
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}
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; (0.0 - X) * Y => 0.0 - (X * Y)
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define float @test6(float %x, float %y) {
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%sub1 = fsub nsz float 0.000000e+00, %x
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%mul = fmul float %sub1, %y
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ret float %mul
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; CHECK-LABEL: @test6(
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; CHECK: %1 = fmul float %x, %y
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; CHECK: %mul = fsub float -0.000000e+00, %1
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}
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; "(-0.0 - X) * Y => -0.0 - (X * Y)" is disabled if expression "-0.0 - X"
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; has multiple uses.
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define float @test7(float %x, float %y) {
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%sub1 = fsub float -0.000000e+00, %x
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%mul = fmul float %sub1, %y
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%mul2 = fmul float %mul, %sub1
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ret float %mul2
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; CHECK-LABEL: @test7(
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; CHECK: fsub float -0.000000e+00, %x
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}
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; Don't crash when attempting to cast a constant FMul to an instruction.
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define void @test8(i32* %inout) {
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entry:
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%0 = load i32* %inout, align 4
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%conv = uitofp i32 %0 to float
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%vecinit = insertelement <4 x float> <float 0.000000e+00, float 0.000000e+00, float 0.000000e+00, float undef>, float %conv, i32 3
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%sub = fsub <4 x float> <float -0.000000e+00, float -0.000000e+00, float -0.000000e+00, float -0.000000e+00>, %vecinit
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%1 = shufflevector <4 x float> %sub, <4 x float> undef, <4 x i32> <i32 1, i32 1, i32 1, i32 1>
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%mul = fmul <4 x float> zeroinitializer, %1
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br label %for.cond
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for.cond: ; preds = %for.body, %entry
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%local_var_7.0 = phi <4 x float> [ %mul, %entry ], [ %2, %for.body ]
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br i1 undef, label %for.body, label %for.end
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for.body: ; preds = %for.cond
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%2 = insertelement <4 x float> %local_var_7.0, float 0.000000e+00, i32 2
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br label %for.cond
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for.end: ; preds = %for.cond
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ret void
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}
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; X * -1.0 => -0.0 - X
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define float @test9(float %x) {
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%mul = fmul float %x, -1.0
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ret float %mul
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; CHECK-LABEL: @test9(
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; CHECK-NOT: fmul
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; CHECK: fsub
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}
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; PR18532
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define <4 x float> @test10(<4 x float> %x) {
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%mul = fmul <4 x float> %x, <float -1.0, float -1.0, float -1.0, float -1.0>
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ret <4 x float> %mul
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; CHECK-LABEL: @test10(
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; CHECK-NOT: fmul
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; CHECK: fsub
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}
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define float @test11(float %x, float %y) {
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%a = fadd fast float %x, 1.0
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%b = fadd fast float %y, 2.0
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%c = fadd fast float %a, %b
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ret float %c
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; CHECK-LABEL: @test11(
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; CHECK-NOT: fadd float
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; CHECK: fadd fast float
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}
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