1; RUN: opt -S -instcombine < %s | FileCheck %s 2 3; (-0.0 - X) * C => X * -C 4define float @test1(float %x) { 5 %sub = fsub float -0.000000e+00, %x 6 %mul = fmul float %sub, 2.0e+1 7 ret float %mul 8 9; CHECK-LABEL: @test1( 10; CHECK: fmul float %x, -2.000000e+01 11} 12 13; (0.0 - X) * C => X * -C 14define float @test2(float %x) { 15 %sub = fsub nsz float 0.000000e+00, %x 16 %mul = fmul float %sub, 2.0e+1 17 ret float %mul 18 19; CHECK-LABEL: @test2( 20; CHECK: fmul float %x, -2.000000e+01 21} 22 23; (-0.0 - X) * (-0.0 - Y) => X * Y 24define float @test3(float %x, float %y) { 25 %sub1 = fsub float -0.000000e+00, %x 26 %sub2 = fsub float -0.000000e+00, %y 27 %mul = fmul fast float %sub1, %sub2 28 ret float %mul 29; CHECK-LABEL: @test3( 30; CHECK: fmul fast float %x, %y 31} 32 33; (0.0 - X) * (0.0 - Y) => X * Y 34define float @test4(float %x, float %y) { 35 %sub1 = fsub nsz float 0.000000e+00, %x 36 %sub2 = fsub nsz float 0.000000e+00, %y 37 %mul = fmul float %sub1, %sub2 38 ret float %mul 39; CHECK-LABEL: @test4( 40; CHECK: fmul float %x, %y 41} 42 43; (-0.0 - X) * Y => -0.0 - (X * Y) 44define float @test5(float %x, float %y) { 45 %sub1 = fsub float -0.000000e+00, %x 46 %mul = fmul float %sub1, %y 47 ret float %mul 48; CHECK-LABEL: @test5( 49; CHECK: %1 = fmul float %x, %y 50; CHECK: %mul = fsub float -0.000000e+00, %1 51} 52 53; (0.0 - X) * Y => 0.0 - (X * Y) 54define float @test6(float %x, float %y) { 55 %sub1 = fsub nsz float 0.000000e+00, %x 56 %mul = fmul float %sub1, %y 57 ret float %mul 58; CHECK-LABEL: @test6( 59; CHECK: %1 = fmul float %x, %y 60; CHECK: %mul = fsub float -0.000000e+00, %1 61} 62 63; "(-0.0 - X) * Y => -0.0 - (X * Y)" is disabled if expression "-0.0 - X" 64; has multiple uses. 65define float @test7(float %x, float %y) { 66 %sub1 = fsub float -0.000000e+00, %x 67 %mul = fmul float %sub1, %y 68 %mul2 = fmul float %mul, %sub1 69 ret float %mul2 70; CHECK-LABEL: @test7( 71; CHECK: fsub float -0.000000e+00, %x 72} 73 74; Don't crash when attempting to cast a constant FMul to an instruction. 75define void @test8(i32* %inout) { 76entry: 77 %0 = load i32, i32* %inout, align 4 78 %conv = uitofp i32 %0 to float 79 %vecinit = insertelement <4 x float> <float 0.000000e+00, float 0.000000e+00, float 0.000000e+00, float undef>, float %conv, i32 3 80 %sub = fsub <4 x float> <float -0.000000e+00, float -0.000000e+00, float -0.000000e+00, float -0.000000e+00>, %vecinit 81 %1 = shufflevector <4 x float> %sub, <4 x float> undef, <4 x i32> <i32 1, i32 1, i32 1, i32 1> 82 %mul = fmul <4 x float> zeroinitializer, %1 83 br label %for.cond 84 85for.cond: ; preds = %for.body, %entry 86 %local_var_7.0 = phi <4 x float> [ %mul, %entry ], [ %2, %for.body ] 87 br i1 undef, label %for.body, label %for.end 88 89for.body: ; preds = %for.cond 90 %2 = insertelement <4 x float> %local_var_7.0, float 0.000000e+00, i32 2 91 br label %for.cond 92 93for.end: ; preds = %for.cond 94 ret void 95} 96 97; X * -1.0 => -0.0 - X 98define float @test9(float %x) { 99 %mul = fmul float %x, -1.0 100 ret float %mul 101 102; CHECK-LABEL: @test9( 103; CHECK-NOT: fmul 104; CHECK: fsub 105} 106 107; PR18532 108define <4 x float> @test10(<4 x float> %x) { 109 %mul = fmul <4 x float> %x, <float -1.0, float -1.0, float -1.0, float -1.0> 110 ret <4 x float> %mul 111 112; CHECK-LABEL: @test10( 113; CHECK-NOT: fmul 114; CHECK: fsub 115} 116 117define float @test11(float %x, float %y) { 118 %a = fadd fast float %x, 1.0 119 %b = fadd fast float %y, 2.0 120 %c = fadd fast float %a, %b 121 ret float %c 122; CHECK-LABEL: @test11( 123; CHECK-NOT: fadd float 124; CHECK: fadd fast float 125} 126 127; PR21126: http://llvm.org/bugs/show_bug.cgi?id=21126 128; With unsafe/fast math, sqrt(X) * sqrt(X) is just X. 129declare double @llvm.sqrt.f64(double) 130 131define double @sqrt_squared1(double %f) { 132 %sqrt = call double @llvm.sqrt.f64(double %f) 133 %mul = fmul fast double %sqrt, %sqrt 134 ret double %mul 135; CHECK-LABEL: @sqrt_squared1( 136; CHECK-NEXT: ret double %f 137} 138 139; With unsafe/fast math, sqrt(X) * sqrt(X) is just X, 140; but make sure another use of the sqrt is intact. 141; Note that the remaining fmul is altered but is not 'fast' 142; itself because it was not marked 'fast' originally. 143; Thus, we have an overall fast result, but no more indication of 144; 'fast'ness in the code. 145define double @sqrt_squared2(double %f) { 146 %sqrt = call double @llvm.sqrt.f64(double %f) 147 %mul1 = fmul fast double %sqrt, %sqrt 148 %mul2 = fmul double %mul1, %sqrt 149 ret double %mul2 150; CHECK-LABEL: @sqrt_squared2( 151; CHECK-NEXT: %sqrt = call double @llvm.sqrt.f64(double %f) 152; CHECK-NEXT: %mul2 = fmul double %sqrt, %f 153; CHECK-NEXT: ret double %mul2 154} 155 156declare float @llvm.fabs.f32(float) nounwind readnone 157 158; CHECK-LABEL @fabs_squared( 159; CHECK: %mul = fmul float %x, %x 160define float @fabs_squared(float %x) { 161 %x.fabs = call float @llvm.fabs.f32(float %x) 162 %mul = fmul float %x.fabs, %x.fabs 163 ret float %mul 164} 165 166; CHECK-LABEL @fabs_squared_fast( 167; CHECK: %mul = fmul fast float %x, %x 168define float @fabs_squared_fast(float %x) { 169 %x.fabs = call float @llvm.fabs.f32(float %x) 170 %mul = fmul fast float %x.fabs, %x.fabs 171 ret float %mul 172} 173 174; CHECK-LABEL @fabs_x_fabs( 175; CHECK: call float @llvm.fabs.f32(float %x) 176; CHECK: call float @llvm.fabs.f32(float %y) 177; CHECK: %mul = fmul float %x.fabs, %y.fabs 178define float @fabs_x_fabs(float %x, float %y) { 179 %x.fabs = call float @llvm.fabs.f32(float %x) 180 %y.fabs = call float @llvm.fabs.f32(float %y) 181 %mul = fmul float %x.fabs, %y.fabs 182 ret float %mul 183} 184