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In some cases, the "fail BB dominator" may be null after the BB was split (and

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becomes reachable when before it wasn't). Check to make sure that it's not null
before trying to use it.

llvm-svn: 128434
This commit is contained in:
Bill Wendling 2011-03-28 23:02:18 +00:00
parent cec6959c23
commit cb8447ad52
2 changed files with 19 additions and 2 deletions
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3
lib/CodeGen/StackProtector.cpp
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@ -221,7 +221,8 @@ bool StackProtector::InsertStackProtectors() {
BasicBlock *NewBB = BB->splitBasicBlock(RI, "SP_return");
if (DT && DT->isReachableFromEntry(BB)) {
DT->addNewBlock(NewBB, BB);
FailBBDom = DT->findNearestCommonDominator(FailBBDom, BB);
if (FailBBDom)
FailBBDom = DT->findNearestCommonDominator(FailBBDom, BB);
}
// Remove default branch instruction to the new BB.

18
test/CodeGen/X86/crash.ll
View File

@ -189,7 +189,7 @@ for.inc44: ; preds = %for.body
}
; PR9028
define void @f(i64 %A) nounwind {
define void @func_60(i64 %A) nounwind {
entry:
%0 = zext i64 %A to i160
%1 = shl i160 %0, 64
@ -199,3 +199,19 @@ entry:
store i576 %4, i576* undef, align 8
ret void
}
; <rdar://problem/9187792>
define fastcc void @func_61() nounwind sspreq {
entry:
%t1 = tail call i64 @llvm.objectsize.i64(i8* undef, i1 false)
%t2 = icmp eq i64 %t1, -1
br i1 %t2, label %bb2, label %bb1
bb1:
ret void
bb2:
ret void
}
declare i64 @llvm.objectsize.i64(i8*, i1) nounwind readnone