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Fix subtracting values > 2^15 in the prologue/epilogue, by Nate Begeman.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15234 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Misha Brukman 2004-07-26 16:22:52 +00:00
parent 8f6c42ba84
commit 3c616b45e7
1 changed files with 20 additions and 4 deletions
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24
lib/Target/PowerPC/PowerPCRegisterInfo.cpp
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@ -218,8 +218,19 @@ void PowerPCRegisterInfo::emitPrologue(MachineFunction &MF) const {
MFI->setStackSize(NumBytes);
// adjust stack pointer: r1 -= numbytes
if (NumBytes) {
MI = BuildMI(PPC32::STWU, 2, PPC32::R1).addSImm(-NumBytes).addReg(PPC32::R1);
if (NumBytes <= 32768) {
MI = BuildMI(PPC32::STWU, 3).addReg(PPC32::R1).addSImm(-NumBytes)
.addReg(PPC32::R1);
MBB.insert(MBBI, MI);
} else {
int NegNumbytes = -NumBytes;
MI = BuildMI(PPC32::LIS, 1, PPC32::R0).addSImm(NegNumbytes >> 16);
MBB.insert(MBBI, MI);
MI = BuildMI(PPC32::ORI, 2, PPC32::R0).addReg(PPC32::R0)
.addImm(NegNumbytes & 0xFFFF);
MBB.insert(MBBI, MI);
MI = BuildMI(PPC32::STWUX, 3).addReg(PPC32::R1).addReg(PPC32::R1)
.addReg(PPC32::R0);
MBB.insert(MBBI, MI);
}
}
@ -247,8 +258,13 @@ void PowerPCRegisterInfo::emitEpilogue(MachineFunction &MF,
MBB.insert(MBBI, MI);
}
// Adjust stack pointer back
MI = BuildMI(PPC32::ADDI, 2, PPC32::R1).addReg(PPC32::R1).addSImm(NumBytes);
MBB.insert(MBBI, MI);
if (NumBytes <= 32767) {
MI = BuildMI(PPC32::ADDI, 2, PPC32::R1).addReg(PPC32::R1).addSImm(NumBytes);
MBB.insert(MBBI, MI);
} else {
MI = BuildMI(PPC32::LWZ, 2, PPC32::R1).addSImm(0).addReg(PPC32::R1);
MBB.insert(MBBI, MI);
}
}
#include "PowerPCGenRegisterInfo.inc"