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fix ShrinkDemandedOps to not leave dead nodes around,

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fixing PR6607


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98512 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-03-14 19:46:02 +00:00
parent 25e0ab9ae5
commit c4a3f23b92
2 changed files with 25 additions and 0 deletions
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6
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
View File

@ -509,6 +509,12 @@ void SelectionDAGISel::ShrinkDemandedOps() {
InWorklist.erase(N);
if (N->use_empty() && N != CurDAG->getRoot().getNode()) {
// Deleting this node may make its operands dead, add them to the worklist
// if they aren't already there.
for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i)
if (InWorklist.insert(N->getOperand(i).getNode()))
Worklist.push_back(N->getOperand(i).getNode());
CurDAG->DeleteNode(N);
continue;
}

19
test/CodeGen/X86/crash.ll
View File

@ -71,3 +71,22 @@ return: ; preds = %if.else, %entry
}
declare i32 @safe(i32)
; PR6607
define fastcc void @test5(i32 %FUNC) nounwind {
foo:
%0 = load i8* undef, align 1 ; <i8> [#uses=3]
%1 = sext i8 %0 to i32 ; <i32> [#uses=2]
%2 = zext i8 %0 to i32 ; <i32> [#uses=1]
%tmp1.i5037 = urem i32 %2, 10 ; <i32> [#uses=1]
%tmp.i5038 = icmp ugt i32 %tmp1.i5037, 15 ; <i1> [#uses=1]
%3 = zext i1 %tmp.i5038 to i8 ; <i8> [#uses=1]
%4 = icmp slt i8 %0, %3 ; <i1> [#uses=1]
%5 = add nsw i32 %1, 256 ; <i32> [#uses=1]
%storemerge.i.i57 = select i1 %4, i32 %5, i32 %1 ; <i32> [#uses=1]
%6 = shl i32 %storemerge.i.i57, 16 ; <i32> [#uses=1]
%7 = sdiv i32 %6, -256 ; <i32> [#uses=1]
%8 = trunc i32 %7 to i8 ; <i8> [#uses=1]
store i8 %8, i8* undef, align 1
ret void
}