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[X86] Use a better sentinel offset for the FrameAddr index

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Other pieces of CodeGen want to negate frame object offsets to account
for architectures where the stack grows down.  Our object is a pseudo
object so it's offset doesn't matter.  However, we shouldn't choose an
offset which results in undefined behavior if you negate it.

llvm-svn: 237474
This commit is contained in:
David Majnemer 2015-05-15 20:08:27 +00:00
parent 0c6b91deee
commit eec8124e55
1 changed files with 1 additions and 1 deletions
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2
lib/Target/X86/X86ISelLowering.cpp
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@ -15637,7 +15637,7 @@ SDValue X86TargetLowering::LowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const {
// Set up a frame object for the return address.
unsigned SlotSize = RegInfo->getSlotSize();
FrameAddrIndex = MF.getFrameInfo()->CreateFixedObject(
SlotSize, /*Offset=*/INT64_MIN, /*IsImmutable=*/false);
SlotSize, /*Offset=*/0, /*IsImmutable=*/false);
FuncInfo->setFAIndex(FrameAddrIndex);
}
return DAG.getFrameIndex(FrameAddrIndex, VT);