| ; 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, 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 |
| } |
| |
| ; 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 |
| } |