1 ; REQUIRES: asserts 2 ; RUN: opt -loop-unswitch -disable-output -stats -info-output-file - < %s | FileCheck --check-prefix=STATS %s 3 ; RUN: opt -loop-unswitch -simplifycfg -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 loop-unswitch - Number of branches unswitched 12 ; STATS: 2 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.split 17 18 ; CHECK: entry.split: 19 ; CHECK-NEXT: br i1 %b, label %cond.end, label %abort1.split 20 21 ; CHECK: cond.end: 22 ; CHECK-NEXT: br label %cond.end 23 24 ; CHECK: abort0.split: 25 ; CHECK-NEXT: call void @end0() [[NOR_NUW:#[0-9]+]] 26 ; CHECK-NEXT: unreachable 27 28 ; CHECK: abort1.split: 29 ; CHECK-NEXT: call void @end1() [[NOR_NUW]] 30 ; CHECK-NEXT: unreachable 31 32 ; CHECK: } 33 34 define void @func_16(i1 %a, i1 %b) nounwind { 35 entry: 36 br label %for.body 37 38 for.body: 39 br i1 %a, label %cond.end, label %abort0 40 41 cond.end: 42 br i1 %b, label %for.body, label %abort1 43 44 abort0: 45 call void @end0() noreturn nounwind 46 unreachable 47 48 abort1: 49 call void @end1() noreturn nounwind 50 unreachable 51 } 52 53 declare void @end0() noreturn 54 declare void @end1() noreturn 55 56 ; CHECK: attributes #0 = { nounwind } 57 ; CHECK: attributes #1 = { noreturn } 58 ; CHECK: attributes [[NOR_NUW]] = { noreturn nounwind } 59
