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Running with frame pointers prevented debugging, external probes and

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potentially some system calls/exception handling from working.  TOS must always
link to previous frame.  This is a short term workaround until alloca scheme is
reworked.

llvm-svn: 31677
This commit is contained in:
Jim Laskey 2006-11-11 10:21:58 +00:00
parent b9e2ae9e37
commit f5bffa5670
1 changed files with 5 additions and 2 deletions
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7
lib/Target/PowerPC/PPCRegisterInfo.cpp
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@ -382,7 +382,8 @@ eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const {
if (hasFP(MF)) {
// If we have a frame pointer, convert as follows:
// ADJCALLSTACKDOWN -> addi, r1, r1, -amount
// ADJCALLSTACKDOWN -> lwz r0, 0(r31)
// stwu, r0, -amount(r1)
// ADJCALLSTACKUP -> addi, r1, r1, amount
MachineInstr *Old = I;
unsigned Amount = Old->getOperand(0).getImmedValue();
@ -395,7 +396,9 @@ eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
// Replace the pseudo instruction with a new instruction...
if (Old->getOpcode() == PPC::ADJCALLSTACKDOWN) {
BuildMI(MBB, I, PPC::ADDI, 2, PPC::R1).addReg(PPC::R1).addImm(-Amount);
BuildMI(MBB, I, PPC::LWZ, 2, PPC::R0).addImm(0).addReg(PPC::R31);
BuildMI(MBB, I, PPC::STWU, 3)
.addReg(PPC::R0).addImm(-Amount).addReg(PPC::R1);
} else {
assert(Old->getOpcode() == PPC::ADJCALLSTACKUP);
BuildMI(MBB, I, PPC::ADDI, 2, PPC::R1).addReg(PPC::R1).addImm(Amount);