}
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;
}
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;
+}
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;