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Constant::IsThreadDependent(): Use dyn_cast<Constant> instead of cast

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It turns out that the operands of a Constant are not always themselves
Constant. For example, one of the operands of BlockAddress is
BasicBlock, which is not a Constant.

This should fix the dragonegg-x86_64-linux-gcc-4.6-test build which
broke in r168037.

llvm-svn: 168147
This commit is contained in:
Hans Wennborg 2012-11-16 10:33:25 +00:00
parent 3f02d70a5b
commit 220b5e3636
2 changed files with 23 additions and 1 deletions
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4
lib/VMCore/Constants.cpp
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@ -261,7 +261,9 @@ bool Constant::isThreadDependent() const {
}
for (unsigned I = 0, E = C->getNumOperands(); I != E; ++I) {
const Constant *D = cast<Constant>(C->getOperand(I));
const Constant *D = dyn_cast<Constant>(C->getOperand(I));
if (!D)
continue;
if (Visited.insert(D))
WorkList.push_back(D);
}

20
test/Transforms/GlobalOpt/blockaddress.ll Normal file
View File

@ -0,0 +1,20 @@
; RUN: opt < %s -globalopt -S | FileCheck %s
@x = internal global i8* zeroinitializer
define void @f() {
; CHECK: @f
; Check that we don't hit an assert in Constant::IsThreadDependent()
; when storing this blockaddress into a global.
store i8* blockaddress(@g, %here), i8** @x, align 8
ret void
}
define void @g() {
; CHECK: @g
here:
ret void
}