diff options
| author | Misha Brukman <brukman+llvm@gmail.com> | 2004-07-26 16:22:52 +0000 |
|---|---|---|
| committer | Misha Brukman <brukman+llvm@gmail.com> | 2004-07-26 16:22:52 +0000 |
| commit | 3c616b45e7f843c64426da74076e6d9e31f4c904 (patch) | |
| tree | 5b5389cfa4f1972bf99069595094dc5dc070cb71 | |
| parent | 8f6c42ba845e7987b6ebb5321e6a7450630dfe0a (diff) | |
Fix subtracting values > 2^15 in the prologue/epilogue, by Nate Begeman.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15234 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Target/PowerPC/PowerPCRegisterInfo.cpp | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/lib/Target/PowerPC/PowerPCRegisterInfo.cpp b/lib/Target/PowerPC/PowerPCRegisterInfo.cpp index d1fdf1f4ac..c8211f64f8 100644 --- a/lib/Target/PowerPC/PowerPCRegisterInfo.cpp +++ b/lib/Target/PowerPC/PowerPCRegisterInfo.cpp @@ -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" |