1 ; RUN: opt < %s -instcombine -S -o - | FileCheck %s 2 3 target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64" 4 5 ; CHECK-LABEL: define float @func1( 6 define float @func1(float %a, float %b, float %c, i1 %cond) { 7 entry: 8 br i1 %cond, label %cond.true, label %cond.false 9 10 cond.true: 11 %sub0 = fsub fast float %a, %b 12 br label %cond.end 13 14 cond.false: 15 %sub1 = fsub fast float %a, %c 16 br label %cond.end 17 18 ; The fast-math flags should always be transfered if possible. 19 ; CHECK-LABEL: cond.end 20 ; CHECK [[PHI:%[^ ]*]] = phi float [ %b, %cond.true ], [ %c, %cond.false ] 21 ; CHECK fsub fast float %a, [[PHI]] 22 cond.end: 23 %e = phi float [ %sub0, %cond.true ], [ %sub1, %cond.false ] 24 ret float %e 25 } 26 27 ; CHECK-LABEL: define float @func2( 28 define float @func2(float %a, float %b, float %c, i1 %cond) { 29 entry: 30 br i1 %cond, label %cond.true, label %cond.false 31 32 cond.true: 33 %sub0 = fsub fast float %a, %b 34 br label %cond.end 35 36 cond.false: 37 %sub1 = fsub float %a, %c 38 br label %cond.end 39 40 ; The fast-math flags should always be transfered if possible. 41 ; CHECK-LABEL: cond.end 42 ; CHECK [[PHI:%[^ ]*]] = phi float [ %b, %cond.true ], [ %c, %cond.false ] 43 ; CHECK fsub float %a, [[PHI]] 44 cond.end: 45 %e = phi float [ %sub0, %cond.true ], [ %sub1, %cond.false ] 46 ret float %e 47 } 48 49 ; CHECK-LABEL: define float @func3( 50 define float @func3(float %a, float %b, float %c, i1 %cond) { 51 entry: 52 br i1 %cond, label %cond.true, label %cond.false 53 54 cond.true: 55 %sub0 = fsub fast float %a, 2.0 56 br label %cond.end 57 58 cond.false: 59 %sub1 = fsub fast float %b, 2.0 60 br label %cond.end 61 62 ; CHECK-LABEL: cond.end 63 ; CHECK [[PHI:%[^ ]*]] = phi float [ %a, %cond.true ], [ %b, %cond.false ] 64 ; CHECK fadd fast float %a, [[PHI]] 65 cond.end: 66 %e = phi float [ %sub0, %cond.true ], [ %sub1, %cond.false ] 67 ret float %e 68 } 69 70 ; CHECK-LABEL: define float @func4( 71 define float @func4(float %a, float %b, float %c, i1 %cond) { 72 entry: 73 br i1 %cond, label %cond.true, label %cond.false 74 75 cond.true: 76 %sub0 = fsub fast float %a, 2.0 77 br label %cond.end 78 79 cond.false: 80 %sub1 = fsub float %b, 2.0 81 br label %cond.end 82 83 ; CHECK-LABEL: cond.end 84 ; CHECK [[PHI:%[^ ]*]] = phi float [ %a, %cond.true ], [ %b, %cond.false ] 85 ; CHECK fadd float %a, [[PHI]] 86 cond.end: 87 %e = phi float [ %sub0, %cond.true ], [ %sub1, %cond.false ] 88 ret float %e 89 } 90
