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762b38dd8c
clear out deleted loops from the current queue beyond just the current loop. This is important because SimpleLoopUnswitch will now enqueue the same loop to be re-processed. When it does this with the legacy PM, we don't have a way of canceling the rest of the pipeline and so we can end up deleting the loop before we reprocess it. =/ This change also makes it easy to support deleting other loops in the queue to process, although I don't have any use cases for that. Differential Revision: https://reviews.llvm.org/D48470 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@335317 91177308-0d34-0410-b5e6-96231b3b80d8
39 lines
927 B
LLVM
39 lines
927 B
LLVM
; RUN: opt -simple-loop-unswitch -loop-deletion -S < %s | FileCheck %s
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;
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; Check that when we do unswitching where we re-enqueue the loop to be processed
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; again, but manage to delete the loop before ever getting to iterate on it, it
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; doesn't crash the legacy pass manager.
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target triple = "x86_64-unknown-linux-gnu"
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define void @pr37888() {
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; CHECK-LABEL: define void @pr37888()
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entry:
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%tobool = icmp ne i16 undef, 0
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br label %for.body
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; CHECK: %[[TOBOOL:.*]] = icmp ne
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; CHECK-NEXT: br i1 %[[TOBOOL]], label %if.then, label %[[ENTRY_SPLIT:.*]]
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;
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; CHECK: [[ENTRY_SPLIT]]:
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; CHECK-NEXT: br label %for.end
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for.body:
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br i1 %tobool, label %if.then, label %if.end
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if.then:
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unreachable
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; CHECK: if.then:
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; CHECK-NEXT: unreachable
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if.end:
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br label %for.inc
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for.inc:
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br i1 undef, label %for.body, label %for.end
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for.end:
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ret void
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; CHECK: for.end:
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; CHECK-NEXT: ret void
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}
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