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b0a57210a4
infinite loops or exits will eventually exit. This fixes PR5373. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112745 91177308-0d34-0410-b5e6-96231b3b80d8
54 lines
1.4 KiB
LLVM
54 lines
1.4 KiB
LLVM
; RUN: opt -loop-unswitch -disable-output -stats -info-output-file - < %s | FileCheck --check-prefix=STATS %s
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; RUN: opt -loop-unswitch -simplifycfg -S < %s | FileCheck %s
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; PR5373
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; Loop unswitching shouldn't trivially unswitch the true case of condition %a
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; in the code here because it leads to an infinite loop. While this doesn't
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; contain any instructions with side effects, it's still a kind of side effect.
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; It can trivially unswitch on the false cas of condition %a though.
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; STATS: 2 loop-unswitch - Number of branches unswitched
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; STATS: 1 loop-unswitch - Number of unswitches that are trivial
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; CHECK: @func_16
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 %a, label %entry.split, label %abort0.split
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; CHECK: entry.split:
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; CHECK-NEXT: br i1 %b, label %cond.end.us, label %abort1
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; CHECK: cond.end.us:
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; CHECK-NEXT: br label %cond.end.us
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; CHECK: abort0.split:
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; CHECK-NEXT: call void @end0() noreturn nounwind
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; CHECK-NEXT: unreachable
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; CHECK: abort1:
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; CHECK-NEXT: call void @end1() noreturn nounwind
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; CHECK-NEXT: unreachable
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; CHECK: }
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define void @func_16(i1 %a, i1 %b) nounwind {
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entry:
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br label %for.body
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for.body:
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br i1 %a, label %cond.end, label %abort0
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cond.end:
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br i1 %b, label %for.body, label %abort1
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abort0:
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call void @end0() noreturn nounwind
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unreachable
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abort1:
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call void @end1() noreturn nounwind
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unreachable
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}
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declare void @end0() noreturn
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declare void @end1() noreturn
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