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; RUN: opt -S -instcombine < %s | FileCheck %s
; (-0.0 - X) * C => X * -C
define float @test1(float %x) {
%sub = fsub float -0.000000e+00, %x
%mul = fmul float %sub, 2.0e+1
ret float %mul
; CHECK-LABEL: @test1(
; CHECK: fmul float %x, -2.000000e+01
}
; (0.0 - X) * C => X * -C
define float @test2(float %x) {
%sub = fsub nsz float 0.000000e+00, %x
%mul = fmul float %sub, 2.0e+1
ret float %mul
; CHECK-LABEL: @test2(
; CHECK: fmul float %x, -2.000000e+01
}
; (-0.0 - X) * (-0.0 - Y) => X * Y
define float @test3(float %x, float %y) {
%sub1 = fsub float -0.000000e+00, %x
%sub2 = fsub float -0.000000e+00, %y
%mul = fmul float %sub1, %sub2
ret float %mul
; CHECK-LABEL: @test3(
; CHECK: fmul float %x, %y
}
; (0.0 - X) * (0.0 - Y) => X * Y
define float @test4(float %x, float %y) {
%sub1 = fsub nsz float 0.000000e+00, %x
%sub2 = fsub nsz float 0.000000e+00, %y
%mul = fmul float %sub1, %sub2
ret float %mul
; CHECK-LABEL: @test4(
; CHECK: fmul float %x, %y
}
; (-0.0 - X) * Y => -0.0 - (X * Y)
define float @test5(float %x, float %y) {
%sub1 = fsub float -0.000000e+00, %x
%mul = fmul float %sub1, %y
ret float %mul
; CHECK-LABEL: @test5(
; CHECK: %1 = fmul float %x, %y
; CHECK: %mul = fsub float -0.000000e+00, %1
}
; (0.0 - X) * Y => 0.0 - (X * Y)
define float @test6(float %x, float %y) {
%sub1 = fsub nsz float 0.000000e+00, %x
%mul = fmul float %sub1, %y
ret float %mul
; CHECK-LABEL: @test6(
; CHECK: %1 = fmul float %x, %y
; CHECK: %mul = fsub float -0.000000e+00, %1
}
; "(-0.0 - X) * Y => -0.0 - (X * Y)" is disabled if expression "-0.0 - X"
; has multiple uses.
define float @test7(float %x, float %y) {
%sub1 = fsub float -0.000000e+00, %x
%mul = fmul float %sub1, %y
%mul2 = fmul float %mul, %sub1
ret float %mul2
; CHECK-LABEL: @test7(
; CHECK: fsub float -0.000000e+00, %x
}
; Don't crash when attempting to cast a constant FMul to an instruction.
define void @test8(i32* %inout) {
entry:
%0 = load i32* %inout, align 4
%conv = uitofp i32 %0 to float
%vecinit = insertelement <4 x float> <float 0.000000e+00, float 0.000000e+00, float 0.000000e+00, float undef>, float %conv, i32 3
%sub = fsub <4 x float> <float -0.000000e+00, float -0.000000e+00, float -0.000000e+00, float -0.000000e+00>, %vecinit
%1 = shufflevector <4 x float> %sub, <4 x float> undef, <4 x i32> <i32 1, i32 1, i32 1, i32 1>
%mul = fmul <4 x float> zeroinitializer, %1
br label %for.cond
for.cond: ; preds = %for.body, %entry
%local_var_7.0 = phi <4 x float> [ %mul, %entry ], [ %2, %for.body ]
br i1 undef, label %for.body, label %for.end
for.body: ; preds = %for.cond
%2 = insertelement <4 x float> %local_var_7.0, float 0.000000e+00, i32 2
br label %for.cond
for.end: ; preds = %for.cond
ret void
}
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