| Eric Christopher | cee313d | 2019-04-17 04:52:47 +0000 | [diff] [blame] | 1 | ; REQUIRES: asserts |
| 2 | ; RUN: opt -simple-loop-unswitch -disable-output -stats -info-output-file - < %s | FileCheck --check-prefix=STATS %s |
| 3 | ; RUN: opt -simple-loop-unswitch -S < %s | FileCheck %s |
| 4 | ; RUN: opt -simple-loop-unswitch -enable-mssa-loop-dependency=true -verify-memoryssa -S < %s | FileCheck %s |
| 5 | ; PR5373 |
| 6 | |
| 7 | ; Loop unswitching shouldn't trivially unswitch the true case of condition %a |
| 8 | ; in the code here because it leads to an infinite loop. While this doesn't |
| 9 | ; contain any instructions with side effects, it's still a kind of side effect. |
| 10 | ; It can trivially unswitch on the false cas of condition %a though. |
| 11 | |
| 12 | ; STATS: 2 simple-loop-unswitch - Number of branches unswitched |
| 13 | ; STATS: 2 simple-loop-unswitch - Number of unswitches that are trivial |
| 14 | |
| 15 | ; CHECK-LABEL: @func_16( |
| 16 | ; CHECK-NEXT: entry: |
| 17 | ; CHECK-NEXT: br i1 %a, label %entry.split, label %abort0 |
| 18 | |
| 19 | ; CHECK: entry.split: |
| 20 | ; CHECK-NEXT: br i1 %b, label %entry.split.split, label %abort1 |
| 21 | |
| 22 | ; CHECK: entry.split.split: |
| 23 | ; CHECK-NEXT: br label %for.body |
| 24 | |
| 25 | ; CHECK: for.body: |
| 26 | ; CHECK-NEXT: br label %cond.end |
| 27 | |
| 28 | ; CHECK: cond.end: |
| 29 | ; CHECK-NEXT: br label %for.body |
| 30 | |
| 31 | ; CHECK: abort0: |
| 32 | ; CHECK-NEXT: call void @end0() [[NOR_NUW:#[0-9]+]] |
| 33 | ; CHECK-NEXT: unreachable |
| 34 | |
| 35 | ; CHECK: abort1: |
| 36 | ; CHECK-NEXT: call void @end1() [[NOR_NUW]] |
| 37 | ; CHECK-NEXT: unreachable |
| 38 | |
| 39 | ; CHECK: } |
| 40 | |
| 41 | define void @func_16(i1 %a, i1 %b) nounwind { |
| 42 | entry: |
| 43 | br label %for.body |
| 44 | |
| 45 | for.body: |
| 46 | br i1 %a, label %cond.end, label %abort0 |
| 47 | |
| 48 | cond.end: |
| 49 | br i1 %b, label %for.body, label %abort1 |
| 50 | |
| 51 | abort0: |
| 52 | call void @end0() noreturn nounwind |
| 53 | unreachable |
| 54 | |
| 55 | abort1: |
| 56 | call void @end1() noreturn nounwind |
| 57 | unreachable |
| 58 | } |
| 59 | |
| 60 | declare void @end0() noreturn |
| 61 | declare void @end1() noreturn |
| 62 | |
| 63 | ; CHECK: attributes #0 = { nounwind } |
| 64 | ; CHECK: attributes #1 = { noreturn } |
| 65 | ; CHECK: attributes [[NOR_NUW]] = { noreturn nounwind } |