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Fix stack frame layout in prologue/epilogue. Patch courtesy of Nate Begeman. 

llvm-svn: 15026
This commit is contained in:
Misha Brukman 2004-07-20 02:23:09 +00:00
parent 9bd41d54c5
commit e036ff8b32
1 changed files with 11 additions and 18 deletions
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29
llvm/lib/Target/PowerPC/PowerPCRegisterInfo.cpp
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@ -196,10 +196,11 @@ void PowerPCRegisterInfo::emitPrologue(MachineFunction &MF) const {
//
NumBytes += MFI->getMaxCallFrameSize() +
24 /* Predefined PowerPC link area */ +
// FIXME: must calculate #non-volatile int regs actually spilled
19*4 /* Spilled int regs */ +
// FIXME: must calculate #non-volatile fp regs actually spilled
0*8 /* Spilled fp regs */;
32 /* Predefined PowerPC params area */ +
0 /* local variables - managed by llvm*/ +
0 * 4 /* volatile GPRs used - managed by llvm */ +
0 * 8 /* volatile FPRs used - managed by llvm */;
// Round the size to a multiple of the alignment (don't forget the 4 byte
// offset though).
@ -209,11 +210,7 @@ void PowerPCRegisterInfo::emitPrologue(MachineFunction &MF) const {
// Store the incoming LR so it is preserved across calls
MI = BuildMI(PPC32::MFLR, 0, PPC32::R0);
MBB.insert(MBBI, MI);
// FIXME: store only CLOBBERED registers in R[13-31]
MI = BuildMI(PPC32::STMW, 3).addReg(PPC32::R13).addSImm(-76)
.addReg(PPC32::R1);
MBB.insert(MBBI, MI);
MI = BuildMI(PPC32::STW, 3).addReg(PPC32::R0).addSImm(8).addReg(PPC32::R1);
MI = BuildMI(PPC32::STW, 3).addReg(PPC32::R0).addImm(8).addReg(PPC32::R1);
MBB.insert(MBBI, MI);
}
@ -238,24 +235,20 @@ void PowerPCRegisterInfo::emitEpilogue(MachineFunction &MF,
// Get the number of bytes allocated from the FrameInfo...
unsigned NumBytes = MFI->getStackSize();
// Adjust stack pointer back
MI = BuildMI(PPC32::LWZ, 2, PPC32::R1).addImm(0).addReg(PPC32::R1);
MBB.insert(MBBI, MI);
// If we have calls, restore the LR value before we branch to it
// FIXME: the assembly printer inserts "calls" aka branch-and-link to get the
// PC address. We may not know about those calls at this time, so be
// conservative.
if (MFI->hasCalls() || true) {
// Read old LR from stack into R0
MI = BuildMI(PPC32::LWZ, 2, PPC32::R0).addSImm(8).addReg(PPC32::R1);
MBB.insert(MBBI, MI);
// FIXME: restore only SAVED registers in R[13-31]
MI = BuildMI(PPC32::LMW, 2, PPC32::R13).addSImm(-76).addReg(PPC32::R1);
// Restore LR
MI = BuildMI(PPC32::LWZ, 2, PPC32::R0).addSImm(NumBytes+8).addReg(PPC32::R1);
MBB.insert(MBBI, MI);
MI = BuildMI(PPC32::MTLR, 1).addReg(PPC32::R0);
MBB.insert(MBBI, MI);
}
// Adjust stack pointer back
MI = BuildMI(PPC32::ADDI, 2, PPC32::R1).addReg(PPC32::R1).addImm(NumBytes);
MBB.insert(MBBI, MI);
}
#include "PowerPCGenRegisterInfo.inc"