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a32748ff23
------------------------------------------------------------------------ r222338 | majnemer | 2014-11-19 01:41:05 -0800 (Wed, 19 Nov 2014) | 16 lines AliasSetTracker: UnknownInsts should contribute to the refcount AliasSetTracker::addUnknown may create an AliasSet devoid of pointers just to contain an instruction if no suitable AliasSet already exists. It will then AliasSet::addUnknownInst and we will be done. However, it's possible for addUnknown to choose an existing AliasSet to addUnknownInst. If this were to occur, we are in a bit of a pickle: removing pointers from the AliasSet can cause the entire AliasSet to become destroyed, taking our unknown instructions out with them. Instead, keep track whether or not our AliasSet has any unknown instructions. This fixes PR21582. ------------------------------------------------------------------------ git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_35@223627 91177308-0d34-0410-b5e6-96231b3b80d8
41 lines
1.3 KiB
LLVM
41 lines
1.3 KiB
LLVM
; RUN: opt < %s -basicaa -licm -S | FileCheck %s
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@b = external global i32, align 4
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@fn3.i = external global i32, align 4
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declare i32 @g() nounwind
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define i32 @f() {
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entry:
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br label %for.cond
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for.cond: ; preds = %for.end, %entry
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; CHECK-LABEL: for.cond:
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; CHECK: store i32 0, i32* @b
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store i32 0, i32* @b, align 4
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br i1 true, label %for.body.preheader, label %for.end
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for.body.preheader: ; preds = %for.cond
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br label %for.body
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for.body: ; preds = %for.body, %for.body.preheader
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%g.15 = phi i32 [ undef, %for.body ], [ 0, %for.body.preheader ]
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%arrayidx2 = getelementptr inbounds i32* @fn3.i, i64 0
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%0 = load i32* %arrayidx2, align 4
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%call = call i32 @g()
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br i1 false, label %for.body, label %for.end.loopexit
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for.end.loopexit: ; preds = %for.body
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br label %for.end
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for.end: ; preds = %for.end.loopexit, %for.cond
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%whatever = phi i32 [ %call, %for.end.loopexit ], [ undef, %for.cond ]
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br i1 false, label %for.cond, label %if.then
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if.then: ; preds = %for.end
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; CHECK-LABEL: if.then:
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; CHECK: phi i32 [ {{.*}}, %for.end ]
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; CHECK-NOT: store i32 0, i32* @b
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; CHECK: ret i32
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ret i32 %whatever
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}
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