1 ; RUN: opt -S -instcombine < %s | FileCheck %s
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
10 ; CHECK: fmul float %x, -2.000000e+01
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
19 ; CHECK-LABEL: @test2(
20 ; CHECK: fmul float %x, -2.000000e+01
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
29 ; CHECK-LABEL: @test3(
30 ; CHECK: fmul fast float %x, %y
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
39 ; CHECK-LABEL: @test4(
40 ; CHECK: fmul float %x, %y
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
48 ; CHECK-LABEL: @test5(
49 ; CHECK: %1 = fmul float %x, %y
50 ; CHECK: %mul = fsub float -0.000000e+00, %1
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
58 ; CHECK-LABEL: @test6(
59 ; CHECK: %1 = fmul float %x, %y
60 ; CHECK: %mul = fsub float -0.000000e+00, %1
63 ; "(-0.0 - X) * Y => -0.0 - (X * Y)" is disabled if expression "-0.0 - X"
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
70 ; CHECK-LABEL: @test7(
71 ; CHECK: fsub float -0.000000e+00, %x
74 ; Don't crash when attempting to cast a constant FMul to an instruction.
75 define void @test8(i32* %inout) {
77 %0 = load 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
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
89 for.body: ; preds = %for.cond
90 %2 = insertelement <4 x float> %local_var_7.0, float 0.000000e+00, i32 2
93 for.end: ; preds = %for.cond
97 ; X * -1.0 => -0.0 - X
98 define float @test9(float %x) {
99 %mul = fmul float %x, -1.0
102 ; CHECK-LABEL: @test9(
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>
112 ; CHECK-LABEL: @test10(
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
122 ; CHECK-LABEL: @test11(
123 ; CHECK-NOT: fadd float
124 ; CHECK: fadd fast float
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)
131 define double @sqrt_squared1(double %f) {
132 %sqrt = call double @llvm.sqrt.f64(double %f)
133 %mul = fmul fast double %sqrt, %sqrt
135 ; CHECK-LABEL: @sqrt_squared1(
136 ; CHECK-NEXT: ret double %f
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
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