; 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(
|
; CHECK: fmul float %x, %y
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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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}
|
|
; (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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}
|
|
; "(-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) {
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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(
|
; CHECK: fsub float -0.000000e+00, %x
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}
|
|
; Don't crash when attempting to cast a constant FMul to an instruction.
|
define void @test8(i32* %inout) {
|
entry:
|
%0 = load i32, i32* %inout, align 4
|
%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
|
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 ]
|
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
|
}
|
|
; X * -1.0 => -0.0 - X
|
define float @test9(float %x) {
|
%mul = fmul float %x, -1.0
|
ret float %mul
|
|
; CHECK-LABEL: @test9(
|
; CHECK-NOT: fmul
|
; CHECK: fsub
|
}
|
|
; PR18532
|
define <4 x float> @test10(<4 x float> %x) {
|
%mul = fmul <4 x float> %x, <float -1.0, float -1.0, float -1.0, float -1.0>
|
ret <4 x float> %mul
|
|
; CHECK-LABEL: @test10(
|
; CHECK-NOT: fmul
|
; CHECK: fsub
|
}
|
|
define float @test11(float %x, float %y) {
|
%a = fadd fast float %x, 1.0
|
%b = fadd fast float %y, 2.0
|
%c = fadd fast float %a, %b
|
ret float %c
|
; CHECK-LABEL: @test11(
|
; CHECK-NOT: fadd float
|
; CHECK: fadd fast float
|
}
|
|
; PR21126: http://llvm.org/bugs/show_bug.cgi?id=21126
|
; With unsafe/fast math, sqrt(X) * sqrt(X) is just X.
|
declare double @llvm.sqrt.f64(double)
|
|
define double @sqrt_squared1(double %f) {
|
%sqrt = call double @llvm.sqrt.f64(double %f)
|
%mul = fmul fast double %sqrt, %sqrt
|
ret double %mul
|
; CHECK-LABEL: @sqrt_squared1(
|
; CHECK-NEXT: ret double %f
|
}
|
|
; With unsafe/fast math, sqrt(X) * sqrt(X) is just X,
|
; but make sure another use of the sqrt is intact.
|
; Note that the remaining fmul is altered but is not 'fast'
|
; itself because it was not marked 'fast' originally.
|
; Thus, we have an overall fast result, but no more indication of
|
; 'fast'ness in the code.
|
define double @sqrt_squared2(double %f) {
|
%sqrt = call double @llvm.sqrt.f64(double %f)
|
%mul1 = fmul fast double %sqrt, %sqrt
|
%mul2 = fmul double %mul1, %sqrt
|
ret double %mul2
|
; CHECK-LABEL: @sqrt_squared2(
|
; CHECK-NEXT: %sqrt = call double @llvm.sqrt.f64(double %f)
|
; CHECK-NEXT: %mul2 = fmul double %sqrt, %f
|
; CHECK-NEXT: ret double %mul2
|
}
|
|
declare float @llvm.fabs.f32(float) nounwind readnone
|
|
; CHECK-LABEL @fabs_squared(
|
; CHECK: %mul = fmul float %x, %x
|
define float @fabs_squared(float %x) {
|
%x.fabs = call float @llvm.fabs.f32(float %x)
|
%mul = fmul float %x.fabs, %x.fabs
|
ret float %mul
|
}
|
|
; CHECK-LABEL @fabs_squared_fast(
|
; CHECK: %mul = fmul fast float %x, %x
|
define float @fabs_squared_fast(float %x) {
|
%x.fabs = call float @llvm.fabs.f32(float %x)
|
%mul = fmul fast float %x.fabs, %x.fabs
|
ret float %mul
|
}
|
|
; CHECK-LABEL @fabs_x_fabs(
|
; CHECK: call float @llvm.fabs.f32(float %x)
|
; CHECK: call float @llvm.fabs.f32(float %y)
|
; CHECK: %mul = fmul float %x.fabs, %y.fabs
|
define float @fabs_x_fabs(float %x, float %y) {
|
%x.fabs = call float @llvm.fabs.f32(float %x)
|
%y.fabs = call float @llvm.fabs.f32(float %y)
|
%mul = fmul float %x.fabs, %y.fabs
|
ret float %mul
|
}
|
