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Infer alignment for non-fixed stack object.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90919 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2009-12-09 01:17:24 +00:00
parent 7ced2e0b30
commit de2ace1758
1 changed files with 4 additions and 3 deletions
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7
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@ -5887,6 +5887,8 @@ unsigned SelectionDAG::InferPtrAlignment(SDValue Ptr) const {
if (FrameIdx != (1 << 31)) {
// FIXME: Handle FI+CST.
const MachineFrameInfo &MFI = *getMachineFunction().getFrameInfo();
unsigned FIInfoAlign = MinAlign(MFI.getObjectAlignment(FrameIdx),
FrameOffset);
if (MFI.isFixedObjectIndex(FrameIdx)) {
int64_t ObjectOffset = MFI.getObjectOffset(FrameIdx) + FrameOffset;
@ -5899,13 +5901,12 @@ unsigned SelectionDAG::InferPtrAlignment(SDValue Ptr) const {
// Finally, the frame object itself may have a known alignment. Factor
// the alignment + offset into a new alignment. For example, if we know
// the FI is 8 byte aligned, but the pointer is 4 off, we really have a
// the FI is 8 byte aligned, but the pointer is 4 off, we really have a
// 4-byte alignment of the resultant pointer. Likewise align 4 + 4-byte
// offset = 4-byte alignment, align 4 + 1-byte offset = align 1, etc.
unsigned FIInfoAlign = MinAlign(MFI.getObjectAlignment(FrameIdx),
FrameOffset);
return std::max(Align, FIInfoAlign);
}
return FIInfoAlign;
}
return 0;