| Cameron Zwarich | 0b8cdfb | 2011-03-15 07:41:25 +0000 | [diff] [blame^] | 1 | ; RUN: opt < %s -lcssa -S | FileCheck %s |
| 2 | ; CHECK: exit1: |
| 3 | ; CHECK: .lcssa = |
| 4 | ; CHECK: exit2: |
| 5 | ; CHECK: .lcssa2 = |
| 6 | ; CHECK: exit3: |
| 7 | ; CHECK-NOT: .lcssa1 = |
| 8 | |
| 9 | ; Test to ensure that when there are multiple exit blocks, PHI nodes are |
| 10 | ; only inserted by LCSSA when there is a use dominated by a given exit |
| 11 | ; block. |
| 12 | |
| 13 | declare void @printf(i32 %i) |
| 14 | |
| 15 | define i32 @unused_phis() nounwind { |
| 16 | entry: |
| 17 | br label %loop |
| 18 | |
| 19 | loop: |
| 20 | %i = phi i32 [0, %entry], [1, %then2] |
| 21 | br i1 undef, label %exit1, label %then1 |
| 22 | |
| 23 | then1: |
| 24 | br i1 undef, label %exit2, label %then2 |
| 25 | |
| 26 | then2: |
| 27 | br i1 undef, label %exit3, label %loop |
| 28 | |
| 29 | exit1: |
| 30 | call void @printf(i32 %i) |
| 31 | ret i32 %i |
| 32 | |
| 33 | exit2: |
| 34 | ret i32 %i |
| 35 | |
| 36 | exit3: |
| 37 | ret i32 0 |
| 38 | } |