1; RUN: opt < %s -passes=reassociate -S | FileCheck %s 2 3define float @test1(float %A) { 4; CHECK-LABEL: @test1( 5; CHECK-NEXT: [[X:%.*]] = fadd float %A, 1.000000e+00 6; CHECK-NEXT: [[Y:%.*]] = fadd float %A, 1.000000e+00 7; CHECK-NEXT: [[R:%.*]] = fsub float [[X]], [[Y]] 8; CHECK-NEXT: ret float [[R]] 9; 10 %X = fadd float %A, 1.000000e+00 11 %Y = fadd float %A, 1.000000e+00 12 %r = fsub float %X, %Y 13 ret float %r 14} 15 16define float @test2(float %A) { 17; CHECK-LABEL: @test2( 18; CHECK-NEXT: ret float 0.000000e+00 19; 20 %X = fadd fast float 1.000000e+00, %A 21 %Y = fadd fast float 1.000000e+00, %A 22 %r = fsub fast float %X, %Y 23 ret float %r 24} 25 26; Check again using minimal subset of FMF. 27 28define float @test2_reassoc(float %A) { 29; CHECK-LABEL: @test2_reassoc( 30; CHECK-NEXT: [[X:%.*]] = fadd reassoc float %A, 1.000000e+00 31; CHECK-NEXT: [[Y:%.*]] = fadd reassoc float %A, 1.000000e+00 32; CHECK-NEXT: [[R:%.*]] = fsub reassoc float [[X]], [[Y]] 33; CHECK-NEXT: ret float [[R]] 34; 35 %X = fadd reassoc float 1.000000e+00, %A 36 %Y = fadd reassoc float 1.000000e+00, %A 37 %r = fsub reassoc float %X, %Y 38 ret float %r 39} 40 41