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: @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: @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 float %sub1, %sub2 28 ret float %mul 29; CHECK: @test3 30; CHECK: fmul 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: @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: @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: @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: @test7 71; CHECK: fsub float -0.000000e+00, %x 72} 73