| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt -passes=sccp -S %s | FileCheck %s |
| |
| ; When marking the edge from bb2 -> exit as executable first, %p will be NaN |
| ; first and %v.1 will simplify to NaN. But when marking bb1 -> exit executable, |
| ; %p will we overdefined and %v.1 will be simplified to 0.0. Make sure we go to |
| ; overdefined, instead of crashing. |
| ; TODO: Can we do better, i.e. choose the 'conservative' 0.0 initially? |
| define float @test1(float %a, i1 %bc) { |
| ; CHECK-LABEL: @test1( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: br i1 [[BC:%.*]], label [[BB1:%.*]], label [[BB2:%.*]] |
| ; CHECK: bb1: |
| ; CHECK-NEXT: br label [[EXIT:%.*]] |
| ; CHECK: bb2: |
| ; CHECK-NEXT: br label [[EXIT]] |
| ; CHECK: exit: |
| ; CHECK-NEXT: [[P:%.*]] = phi float [ [[A:%.*]], [[BB1]] ], [ 0x7FF8000000000000, [[BB2]] ] |
| ; CHECK-NEXT: [[V_1:%.*]] = fmul float [[P]], 0.000000e+00 |
| ; CHECK-NEXT: [[V_2:%.*]] = fadd float [[V_1]], 0xFFF8000000000000 |
| ; CHECK-NEXT: ret float [[V_2]] |
| ; |
| entry: |
| br i1 %bc, label %bb1, label %bb2 |
| |
| bb1: |
| br label %exit |
| |
| bb2: |
| br label %exit |
| |
| exit: |
| %p = phi float [ %a, %bb1 ], [ 0x7FF8000000000000, %bb2 ] |
| %v.1 = fmul float %p, 0.000000e+00 |
| %v.2 = fadd float %v.1, 0xFFF8000000000000 |
| ret float %v.2 |
| } |
| |
| ; Same as @test1, but with the incoming values switched. |
| define float @test2(float %a, i1 %bc) { |
| ; CHECK-LABEL: @test2( |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: br i1 [[BC:%.*]], label [[BB1:%.*]], label [[BB2:%.*]] |
| ; CHECK: bb1: |
| ; CHECK-NEXT: br label [[EXIT:%.*]] |
| ; CHECK: bb2: |
| ; CHECK-NEXT: br label [[EXIT]] |
| ; CHECK: exit: |
| ; CHECK-NEXT: [[P:%.*]] = phi float [ 0x7FF8000000000000, [[BB1]] ], [ [[A:%.*]], [[BB2]] ] |
| ; CHECK-NEXT: [[V_1:%.*]] = fmul float [[P]], 0.000000e+00 |
| ; CHECK-NEXT: ret float 0xFFF8000000000000 |
| ; |
| entry: |
| br i1 %bc, label %bb1, label %bb2 |
| |
| bb1: |
| br label %exit |
| |
| bb2: |
| br label %exit |
| |
| exit: |
| %p = phi float [ 0x7FF8000000000000, %bb1 ], [ %a, %bb2 ] |
| %v.1 = fmul float %p, 0.000000e+00 |
| %v.2 = fadd float %v.1, 0xFFF8000000000000 |
| ret float %v.2 |
| } |