| ; RUN: opt -loop-unswitch -disable-output -stats -info-output-file - < %s | FileCheck --check-prefix=STATS %s |
| ; RUN: opt -loop-unswitch -simplifycfg -S < %s | FileCheck %s |
| ; PR5373 |
| |
| ; Loop unswitching shouldn't trivially unswitch the true case of condition %a |
| ; in the code here because it leads to an infinite loop. While this doesn't |
| ; contain any instructions with side effects, it's still a kind of side effect. |
| ; It can trivially unswitch on the false cas of condition %a though. |
| |
| ; STATS: 2 loop-unswitch - Number of branches unswitched |
| ; STATS: 1 loop-unswitch - Number of unswitches that are trivial |
| |
| ; CHECK: @func_16 |
| ; CHECK-NEXT: entry: |
| ; CHECK-NEXT: br i1 %a, label %entry.split, label %abort0.split |
| |
| ; CHECK: entry.split: |
| ; CHECK-NEXT: br i1 %b, label %cond.end.us, label %abort1 |
| |
| ; CHECK: cond.end.us: |
| ; CHECK-NEXT: br label %cond.end.us |
| |
| ; CHECK: abort0.split: |
| ; CHECK-NEXT: call void @end0() noreturn nounwind |
| ; CHECK-NEXT: unreachable |
| |
| ; CHECK: abort1: |
| ; CHECK-NEXT: call void @end1() noreturn nounwind |
| ; CHECK-NEXT: unreachable |
| |
| ; CHECK: } |
| |
| define void @func_16(i1 %a, i1 %b) nounwind { |
| entry: |
| br label %for.body |
| |
| for.body: |
| br i1 %a, label %cond.end, label %abort0 |
| |
| cond.end: |
| br i1 %b, label %for.body, label %abort1 |
| |
| abort0: |
| call void @end0() noreturn nounwind |
| unreachable |
| |
| abort1: |
| call void @end1() noreturn nounwind |
| unreachable |
| } |
| |
| declare void @end0() noreturn |
| declare void @end1() noreturn |
