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Register allocator is responsible for spilling callee saved regs

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5092 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2002-12-17 02:48:57 +00:00
parent 5b9cd61946
commit 6c6cf873f3
1 changed files with 3 additions and 19 deletions
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22
lib/Target/X86/X86RegisterInfo.cpp
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@ -117,14 +117,6 @@ void X86RegisterInfo::emitPrologue(MachineFunction &MF,
MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB
MachineBasicBlock::iterator MBBI = MBB.begin(); MachineBasicBlock::iterator MBBI = MBB.begin();
// PUSH all callee-save registers
const unsigned* regs = getCalleeSaveRegs();
while (*regs) {
MachineInstr *MI = BuildMI(X86::PUSHr32, 1).addReg(*regs);
MBBI = ++MBB.insert(MBBI, MI);
++regs;
}
// PUSH ebp // PUSH ebp
MachineInstr *MI = BuildMI(X86::PUSHr32, 1).addReg(X86::EBP); MachineInstr *MI = BuildMI(X86::PUSHr32, 1).addReg(X86::EBP);
MBBI = ++MBB.insert(MBBI, MI); MBBI = ++MBB.insert(MBBI, MI);
@ -144,15 +136,7 @@ void X86RegisterInfo::emitEpilogue(MachineBasicBlock &MBB,
assert((*MBBI)->getOpcode() == X86::RET && assert((*MBBI)->getOpcode() == X86::RET &&
"Can only insert epilog into returning blocks"); "Can only insert epilog into returning blocks");
// insert LEAVE // insert LEAVE: mov ESP, EBP; pop EBP
MBBI = ++MBB.insert(MBBI, BuildMI(X86::LEAVE, 0)); MBBI = ++MBB.insert(MBBI, BuildMI(X86::MOVrr32, 1,X86::ESP).addReg(X86::EBP));
MBBI = ++MBB.insert(MBBI, BuildMI(X86::POPr32, 1).addReg(X86::EBP));
// 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]) {
MachineInstr *MI = BuildMI(X86::POPr32, 0, regs[idx++]);
MBBI = ++(MBB.insert(MBBI, MI));
}
} }