| Dan Gohman | b0a5721 | 2010-09-01 21:46:45 +0000 | [diff] [blame] | 1 | ; RUN: opt -loop-unswitch -disable-output -stats -info-output-file - < %s | FileCheck --check-prefix=STATS %s |
| 2 | ; RUN: opt -loop-unswitch -simplifycfg -S < %s | FileCheck %s |
| 3 | ; PR5373 |
| 4 | |
| 5 | ; Loop unswitching shouldn't trivially unswitch the true case of condition %a |
| 6 | ; in the code here because it leads to an infinite loop. While this doesn't |
| 7 | ; contain any instructions with side effects, it's still a kind of side effect. |
| 8 | ; It can trivially unswitch on the false cas of condition %a though. |
| 9 | |
| 10 | ; STATS: 2 loop-unswitch - Number of branches unswitched |
| 11 | ; STATS: 1 loop-unswitch - Number of unswitches that are trivial |
| 12 | |
| 13 | ; CHECK: @func_16 |
| 14 | ; CHECK-NEXT: entry: |
| 15 | ; CHECK-NEXT: br i1 %a, label %entry.split, label %abort0.split |
| 16 | |
| 17 | ; CHECK: entry.split: |
| 18 | ; CHECK-NEXT: br i1 %b, label %cond.end.us, label %abort1 |
| 19 | |
| 20 | ; CHECK: cond.end.us: |
| 21 | ; CHECK-NEXT: br label %cond.end.us |
| 22 | |
| 23 | ; CHECK: abort0.split: |
| 24 | ; CHECK-NEXT: call void @end0() noreturn nounwind |
| 25 | ; CHECK-NEXT: unreachable |
| 26 | |
| 27 | ; CHECK: abort1: |
| 28 | ; CHECK-NEXT: call void @end1() noreturn nounwind |
| 29 | ; CHECK-NEXT: unreachable |
| 30 | |
| 31 | ; CHECK: } |
| 32 | |
| 33 | define void @func_16(i1 %a, i1 %b) nounwind { |
| 34 | entry: |
| 35 | br label %for.body |
| 36 | |
| 37 | for.body: |
| 38 | br i1 %a, label %cond.end, label %abort0 |
| 39 | |
| 40 | cond.end: |
| 41 | br i1 %b, label %for.body, label %abort1 |
| 42 | |
| 43 | abort0: |
| 44 | call void @end0() noreturn nounwind |
| 45 | unreachable |
| 46 | |
| 47 | abort1: |
| 48 | call void @end1() noreturn nounwind |
| 49 | unreachable |
| 50 | } |
| 51 | |
| 52 | declare void @end0() noreturn |
| 53 | declare void @end1() noreturn |