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