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 float %sub1, %sub2 28 ret float %mul 29 ; CHECK-LABEL: @test3( 30 ; CHECK: fmul 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
