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SP relative offsets need to be adjusted by the local allocation size when

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determining if they're likely to be in range of the SP when resolving
frame references.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112624 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jim Grosbach 2010-08-31 18:52:31 +00:00
parent 8480c2e314
commit c1dc78de76
1 changed files with 4 additions and 0 deletions
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4
lib/Target/ARM/ARMBaseRegisterInfo.cpp
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@ -1480,7 +1480,11 @@ needsFrameBaseReg(MachineInstr *MI, int64_t Offset) const {
if (!AFI->isThumbFunction() || !AFI->isThumb1OnlyFunction())
FPOffset -= 80;
// Estimate an offset from the stack pointer.
// The incoming offset is relating to the SP at the start of the function,
// but when we access the local it'll be relative to the SP after local
// allocation, so adjust our SP-relative offset by that allocation size.
Offset = -Offset;
Offset += MFI->getLocalFrameSize();
// Assume that we'll have at least some spill slots allocated.
// FIXME: This is a total SWAG number. We should run some statistics
// and pick a real one.