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Fix rewriting frame offsets with ixaddr instructions, which implicitly shift 

the offset two bits to the left.

llvm-svn: 28933
This commit is contained in:
Chris Lattner 2006-06-27 18:55:49 +00:00
parent a07410c95b
commit db9a95b775
1 changed files with 21 additions and 8 deletions
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29
llvm/lib/Target/PowerPC/PPCRegisterInfo.cpp
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@ -390,9 +390,27 @@ PPCRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II) const {
// Take into account whether it's an add or mem instruction // Take into account whether it's an add or mem instruction
unsigned OffIdx = (i == 2) ? 1 : 2; unsigned OffIdx = (i == 2) ? 1 : 2;
// Figure out if the offset in the instruction is shifted right two bits. This
// is true for instructions like "STD", which the machine implicitly adds two
// low zeros to.
bool isIXAddr = false;
switch (MI.getOpcode()) {
case PPC::LWA:
case PPC::LD:
case PPC::STD:
case PPC::STD_32:
isIXAddr = true;
break;
}
// Now add the frame object offset to the offset from r1. // Now add the frame object offset to the offset from r1.
int Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex) + int Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex);
MI.getOperand(OffIdx).getImmedValue();
if (!isIXAddr)
Offset += MI.getOperand(OffIdx).getImmedValue();
else
Offset += MI.getOperand(OffIdx).getImmedValue() << 2;
// If we're not using a Frame Pointer that has been set to the value of the // If we're not using a Frame Pointer that has been set to the value of the
// SP before having the stack size subtracted from it, then add the stack size // SP before having the stack size subtracted from it, then add the stack size
@ -415,14 +433,9 @@ PPCRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II) const {
MI.getOperand(1).ChangeToRegister(MI.getOperand(i).getReg()); MI.getOperand(1).ChangeToRegister(MI.getOperand(i).getReg());
MI.getOperand(2).ChangeToRegister(PPC::R0); MI.getOperand(2).ChangeToRegister(PPC::R0);
} else { } else {
switch (MI.getOpcode()) { if (isIXAddr) {
case PPC::LWA:
case PPC::LD:
case PPC::STD:
case PPC::STD_32:
assert((Offset & 3) == 0 && "Invalid frame offset!"); assert((Offset & 3) == 0 && "Invalid frame offset!");
Offset >>= 2; // The actual encoded value has the low two bits zero. Offset >>= 2; // The actual encoded value has the low two bits zero.
break;
} }
MI.getOperand(OffIdx).ChangeToImmediate(Offset); MI.getOperand(OffIdx).ChangeToImmediate(Offset);
} }