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ReplaceAllUsesOfValueWith may delete other nodes that the one being replaced. Do not delete dead nodes again.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92988 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2010-01-08 02:36:12 +00:00
parent b093bd0565
commit 6f279e0bda
2 changed files with 29 additions and 1 deletions
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3
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -459,7 +459,8 @@ void SelectionDAGISel::ShrinkDemandedOps() {
SDNode *N = Worklist.pop_back_val();
if (N->use_empty() && N != CurDAG->getRoot().getNode()) {
CurDAG->DeleteNode(N);
if (N->getOpcode() != ISD::DELETED_NODE)
CurDAG->DeleteNode(N);
continue;
}

27
test/CodeGen/X86/2010-01-07-ISelBug.ll Normal file
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@ -0,0 +1,27 @@
; RUN: llc < %s -mtriple=x86_64-apple-darwin10
; rdar://r7519827
define i32 @t() nounwind ssp {
entry:
br label %if.end.i11
if.end.i11: ; preds = %lor.lhs.false.i10, %lor.lhs.false.i10, %lor.lhs.false.i10
br i1 undef, label %for.body161, label %for.end197
for.body161: ; preds = %if.end.i11
br label %for.end197
for.end197: ; preds = %for.body161, %if.end.i11
%mlucEntry.4 = phi i96 [ undef, %for.body161 ], [ undef, %if.end.i11 ] ; <i96> [#uses=2]
store i96 %mlucEntry.4, i96* undef, align 8
%tmp172 = lshr i96 %mlucEntry.4, 64 ; <i96> [#uses=1]
%tmp173 = trunc i96 %tmp172 to i32 ; <i32> [#uses=1]
%tmp1.i1.i = call i32 @llvm.bswap.i32(i32 %tmp173) nounwind ; <i32> [#uses=1]
store i32 %tmp1.i1.i, i32* undef, align 8
unreachable
if.then283: ; preds = %lor.lhs.false.i10, %do.end105, %for.end
ret i32 undef
}
declare i32 @llvm.bswap.i32(i32) nounwind readnone