1 ; RUN: opt -S -instcombine < %s | FileCheck %s 2 3 ; (-0.0 - X) * C => X * -C 4 define 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 14 define 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 24 define 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 34 define 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) 44 define 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) 54 define 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. 65 define 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. 75 define void @test8(i32* %inout) { 76 entry: 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 85 for.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 89 for.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 93 for.end: ; preds = %for.cond 94 ret void 95 } 96 97 ; X * -1.0 => -0.0 - X 98 define 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 108 define <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 } 116 117 define 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. 129 declare double @llvm.sqrt.f64(double) 130 131 define 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. 145 define 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
