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[DAG] Fixed predicate for determining when two frame indices

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addresses are comparable. NFCI.

llvm-svn: 307055
This commit is contained in:
Nirav Dave 2017-07-04 02:20:17 +00:00
parent e6c7524092
commit d98172f6a7
1 changed files with 5 additions and 5 deletions
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10
lib/CodeGen/SelectionDAG/SelectionDAGAddressAnalysis.cpp
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@ -37,13 +37,13 @@ bool BaseIndexOffset::equalBaseIndex(BaseIndexOffset &Other,
const MachineFrameInfo &MFI = DAG.getMachineFunction().getFrameInfo();
// Match non-equal FrameIndexes - a FrameIndex stemming from an
// alloca will not have it's ObjectOffset set until post-DAG and
// as such we must assume the two framesIndices are incomparable.
// Match non-equal FrameIndexes - If both frame indices are fixed
// we know their relative offsets and can compare them. Otherwise
// we must be conservative.
if (auto *A = dyn_cast<FrameIndexSDNode>(Base))
if (auto *B = dyn_cast<FrameIndexSDNode>(Other.Base))
if (!MFI.getObjectAllocation(A->getIndex()) &&
!MFI.getObjectAllocation(B->getIndex())) {
if (MFI.isFixedObjectIndex(A->getIndex()) &&
MFI.isFixedObjectIndex(B->getIndex())) {
Off += MFI.getObjectOffset(B->getIndex()) -
MFI.getObjectOffset(A->getIndex());
return true;