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PEI: Skip dead objects when looking at CSRs

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On AMDGPU if an SGPR is spilled to a VGPR, the frame index
is deleted. If there were any CSR SGPRs, this woudl
assert when setting the offset.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@301961 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matt Arsenault 2017-05-02 18:56:28 +00:00
parent 1d482c01f6
commit 012b7077ca
1 changed files with 3 additions and 0 deletions

3
lib/CodeGen/PrologEpilogInserter.cpp

@ -761,6 +761,9 @@ void PEI::calculateFrameObjectOffsets(MachineFunction &Fn) {
} else if (MaxCSFrameIndex >= MinCSFrameIndex) {
// Be careful about underflow in comparisons agains MinCSFrameIndex.
for (unsigned i = MaxCSFrameIndex; i != MinCSFrameIndex - 1; --i) {
if (MFI.isDeadObjectIndex(i))
continue;
unsigned Align = MFI.getObjectAlignment(i);
// Adjust to alignment boundary
Offset = alignTo(Offset, Align, Skew);