derek.holloway
7502bf64a4
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65 lines
1.7 KiB
LLVM
65 lines
1.7 KiB
LLVM
; REQUIRES: asserts
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; RUN: opt -passes=simple-loop-unswitch -disable-output -stats -info-output-file - < %s | FileCheck --check-prefix=STATS %s
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; RUN: opt -passes=simple-loop-unswitch -verify-memoryssa -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 simple-loop-unswitch - Number of branches unswitched
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; STATS: 2 simple-loop-unswitch - Number of unswitches that are trivial
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; CHECK-LABEL: @func_16(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 %a, label %entry.split, label %abort0
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; CHECK: entry.split:
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; CHECK-NEXT: br i1 %b, label %entry.split.split, label %abort1
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; CHECK: entry.split.split:
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; CHECK-NEXT: br label %for.body
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; CHECK: for.body:
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; CHECK-NEXT: br label %cond.end
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; CHECK: cond.end:
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; CHECK-NEXT: br label %for.body
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; CHECK: abort0:
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; CHECK-NEXT: call void @end0() [[NOR_NUW:#[0-9]+]]
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; CHECK-NEXT: unreachable
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; CHECK: abort1:
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; CHECK-NEXT: call void @end1() [[NOR_NUW]]
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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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; CHECK: attributes #0 = { nounwind }
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; CHECK: attributes #1 = { noreturn }
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; CHECK: attributes [[NOR_NUW]] = { noreturn nounwind }
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