126 lines
3.4 KiB
LLVM
126 lines
3.4 KiB
LLVM
; 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 fast float %sub1, %sub2
|
|
ret float %mul
|
|
; CHECK-LABEL: @test3(
|
|
; CHECK: fmul fast 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
|
|
}
|
|
|
|
; 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
|
|
}
|