| ; RUN: opt < %s -passes=reassociate,instcombine -S | FileCheck %s |
| |
| define float @test1(float %A, float %B) { |
| ; CHECK-LABEL: @test1( |
| ; CHECK-NEXT: [[Z:%.*]] = fadd fast float %A, %B |
| ; CHECK-NEXT: ret float [[Z]] |
| ; |
| %W = fadd fast float %B, -5.0 |
| %Y = fadd fast float %A, 5.0 |
| %Z = fadd fast float %W, %Y |
| ret float %Z |
| } |
| |
| ; Check again using minimal subset of FMF. |
| ; Both 'reassoc' and 'nsz' are required. |
| define float @test1_reassoc_nsz(float %A, float %B) { |
| ; CHECK-LABEL: @test1_reassoc_nsz( |
| ; CHECK-NEXT: [[Z:%.*]] = fadd reassoc nsz float %A, %B |
| ; CHECK-NEXT: ret float [[Z]] |
| ; |
| %W = fadd reassoc nsz float %B, -5.0 |
| %Y = fadd reassoc nsz float %A, 5.0 |
| %Z = fadd reassoc nsz float %W, %Y |
| ret float %Z |
| } |
| |
| ; Verify the fold is not done with only 'reassoc' ('nsz' is required). |
| define float @test1_reassoc(float %A, float %B) { |
| ; CHECK-LABEL: @test1_reassoc( |
| ; CHECK-NEXT: [[W:%.*]] = fadd reassoc float %B, -5.000000e+00 |
| ; CHECK-NEXT: [[Y:%.*]] = fadd reassoc float %A, 5.000000e+00 |
| ; CHECK-NEXT: [[Z:%.*]] = fadd reassoc float [[Y]], [[W]] |
| ; CHECK-NEXT: ret float [[Z]] |
| ; |
| %W = fadd reassoc float %B, -5.0 |
| %Y = fadd reassoc float %A, 5.0 |
| %Z = fadd reassoc float %W, %Y |
| ret float %Z |
| } |