diff options
| -rw-r--r-- | lib/Target/X86/X86RegisterInfo.cpp | 55 | ||||
| -rw-r--r-- | lib/Target/X86/X86RegisterInfo.h | 8 |
2 files changed, 62 insertions, 1 deletions
diff --git a/lib/Target/X86/X86RegisterInfo.cpp b/lib/Target/X86/X86RegisterInfo.cpp index ef4fce5e96..a1ed317bd6 100644 --- a/lib/Target/X86/X86RegisterInfo.cpp +++ b/lib/Target/X86/X86RegisterInfo.cpp @@ -58,7 +58,7 @@ unsigned X86RegisterInfo::getStackPointer() const { } const unsigned* X86RegisterInfo::getCalleeSaveRegs() const { - static const unsigned CalleeSaveRegs[] = { X86::ESI, X86::EDI, X86::EBX, X86::EBP, + static const unsigned CalleeSaveRegs[] = { X86::ESI, X86::EDI, X86::EBX, MRegisterInfo::NoRegister }; return CalleeSaveRegs; } @@ -69,3 +69,56 @@ const unsigned* X86RegisterInfo::getCallerSaveRegs() const { MRegisterInfo::NoRegister }; return CallerSaveRegs; } + +MachineBasicBlock::iterator +X86RegisterInfo::emitPrologue(MachineBasicBlock *MBB, + MachineBasicBlock::iterator MBBI, + unsigned numBytes) const +{ + MachineInstr *MI; + + // PUSH ebp + MI = BuildMI (X86::PUSHr32, 1).addReg(X86::EBP); + MBBI = ++(MBB->insert(MBBI, MI)); + + // MOV ebp, esp + MI = BuildMI (X86::MOVrr32, 2).addReg(X86::EBP).addReg(X86::ESP); + MBBI = ++(MBB->insert(MBBI, MI)); + + // adjust stack pointer + MI = BuildMI(X86::SUBri32, 2).addReg(X86::ESP).addZImm(numBytes); + MBBI = ++(MBB->insert(MBBI, MI)); + + // PUSH all callee-save registers + const unsigned* regs = getCalleeSaveRegs(); + while (*regs) { + MI = BuildMI(X86::PUSHr32, 1).addReg(*regs); + MBBI = ++(MBB->insert(MBBI, MI)); + ++regs; + } + + return MBBI; +} + +MachineBasicBlock::iterator +X86RegisterInfo::emitEpilogue(MachineBasicBlock *MBB, + MachineBasicBlock::iterator MBBI, + unsigned numBytes) const +{ + MachineInstr *MI; + + // POP all callee-save registers in REVERSE ORDER + static const unsigned regs[] = { X86::EBX, X86::EDI, X86::ESI, + MRegisterInfo::NoRegister }; + unsigned idx = 0; + while (regs[idx]) { + MI = BuildMI(X86::POPr32, 1).addReg(regs[idx++]); + MBBI = ++(MBB->insert(MBBI, MI)); + } + + // insert LEAVE + MI = BuildMI(X86::LEAVE, 0); + MBBI = ++(MBB->insert(MBBI, MI)); + + return MBBI; +} diff --git a/lib/Target/X86/X86RegisterInfo.h b/lib/Target/X86/X86RegisterInfo.h index be3cbc09bc..76950e8d88 100644 --- a/lib/Target/X86/X86RegisterInfo.h +++ b/lib/Target/X86/X86RegisterInfo.h @@ -35,6 +35,14 @@ struct X86RegisterInfo : public MRegisterInfo { const unsigned* getCalleeSaveRegs() const; const unsigned* getCallerSaveRegs() const; + MachineBasicBlock::iterator emitPrologue(MachineBasicBlock *MBB, + MachineBasicBlock::iterator MBBI, + unsigned numBytes) const; + + MachineBasicBlock::iterator emitEpilogue(MachineBasicBlock *MBB, + MachineBasicBlock::iterator MBBI, + unsigned numBytes) const; + /// Returns register class appropriate for input SSA register /// const TargetRegisterClass *getClassForReg(unsigned Reg) const; |