| ; RUN: opt < %s -lcssa -S | FileCheck %s |
| ; CHECK: exit1: |
| ; CHECK: .lcssa = |
| ; CHECK: exit2: |
| ; CHECK: .lcssa2 = |
| ; CHECK: exit3: |
| ; CHECK-NOT: .lcssa1 = |
| |
| ; Test to ensure that when there are multiple exit blocks, PHI nodes are |
| ; only inserted by LCSSA when there is a use dominated by a given exit |
| ; block. |
| |
| declare void @printf(i32 %i) |
| |
| define i32 @unused_phis() nounwind { |
| entry: |
| br label %loop |
| |
| loop: |
| %i = phi i32 [0, %entry], [1, %then2] |
| br i1 undef, label %exit1, label %then1 |
| |
| then1: |
| br i1 undef, label %exit2, label %then2 |
| |
| then2: |
| br i1 undef, label %exit3, label %loop |
| |
| exit1: |
| call void @printf(i32 %i) |
| ret i32 %i |
| |
| exit2: |
| ret i32 %i |
| |
| exit3: |
| ret i32 0 |
| } |
