//===- X86RegisterInfo.cpp - X86 Register Information -----------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
//
// This file contains the X86 implementation of the MRegisterInfo class. This
// file is responsible for the frame pointer elimination optimization on X86.
#include "llvm/Target/TargetFrameInfo.h"
#include "Support/CommandLine.h"
+namespace llvm {
+
namespace {
cl::opt<bool>
NoFPElim("disable-fp-elim",
}
}
-void X86RegisterInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
- MachineBasicBlock::iterator &MBBI,
- unsigned SrcReg, int FrameIdx,
- const TargetRegisterClass *RC) const {
+int X86RegisterInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator &MBBI,
+ unsigned SrcReg, int FrameIdx,
+ const TargetRegisterClass *RC) const {
static const unsigned Opcode[] =
{ X86::MOVrm8, X86::MOVrm16, X86::MOVrm32, X86::FSTPr80 };
MachineInstr *MI = addFrameReference(BuildMI(Opcode[getIdx(RC)], 5),
FrameIdx).addReg(SrcReg);
MBBI = MBB.insert(MBBI, MI)+1;
+ return 1;
}
-void X86RegisterInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
- MachineBasicBlock::iterator &MBBI,
- unsigned DestReg, int FrameIdx,
- const TargetRegisterClass *RC) const{
+int X86RegisterInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator &MBBI,
+ unsigned DestReg, int FrameIdx,
+ const TargetRegisterClass *RC) const{
static const unsigned Opcode[] =
{ X86::MOVmr8, X86::MOVmr16, X86::MOVmr32, X86::FLDr80 };
MachineInstr *MI = addFrameReference(BuildMI(Opcode[getIdx(RC)], 4, DestReg),
FrameIdx);
MBBI = MBB.insert(MBBI, MI)+1;
+ return 1;
}
-void X86RegisterInfo::copyRegToReg(MachineBasicBlock &MBB,
- MachineBasicBlock::iterator &MBBI,
- unsigned DestReg, unsigned SrcReg,
- const TargetRegisterClass *RC) const {
+int X86RegisterInfo::copyRegToReg(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator &MBBI,
+ unsigned DestReg, unsigned SrcReg,
+ const TargetRegisterClass *RC) const {
static const unsigned Opcode[] =
{ X86::MOVrr8, X86::MOVrr16, X86::MOVrr32, X86::FpMOV };
MachineInstr *MI = BuildMI(Opcode[getIdx(RC)],1,DestReg).addReg(SrcReg);
MBBI = MBB.insert(MBBI, MI)+1;
+ return 1;
}
//===----------------------------------------------------------------------===//
return NoFPElim || MF.getFrameInfo()->hasVarSizedObjects();
}
-void X86RegisterInfo::eliminateCallFramePseudoInstr(MachineFunction &MF,
- MachineBasicBlock &MBB,
+int X86RegisterInfo::eliminateCallFramePseudoInstr(MachineFunction &MF,
+ MachineBasicBlock &MBB,
MachineBasicBlock::iterator &I) const {
MachineInstr *New = 0, *Old = *I;;
if (hasFP(MF)) {
}
}
- if (New)
+ if (New) {
*I = New; // Replace the pseudo instruction with a new instruction...
- else
+ delete Old;
+ return 0;
+ } else {
I = MBB.erase(I);// Just delete the pseudo instruction...
- delete Old;
+ delete Old;
+ return -1;
+ }
}
-void X86RegisterInfo::eliminateFrameIndex(MachineFunction &MF,
- MachineBasicBlock::iterator &II) const {
+int X86RegisterInfo::eliminateFrameIndex(MachineFunction &MF,
+ MachineBasicBlock::iterator &II) const {
unsigned i = 0;
MachineInstr &MI = **II;
while (!MI.getOperand(i).isFrameIndex()) {
Offset += MF.getFrameInfo()->getStackSize();
MI.SetMachineOperandConst(i+3, MachineOperand::MO_SignExtendedImmed, Offset);
+ return 0;
}
-void X86RegisterInfo::processFunctionBeforeFrameFinalized(MachineFunction &MF)
+int X86RegisterInfo::processFunctionBeforeFrameFinalized(MachineFunction &MF)
const {
if (hasFP(MF)) {
// Create a frame entry for the EBP register that must be saved.
assert(FrameIdx == MF.getFrameInfo()->getObjectIndexEnd()-1 &&
"Slot for EBP register must be last in order to be found!");
}
+ return 0;
}
-void X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
+int X86RegisterInfo::emitPrologue(MachineFunction &MF) const {
MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB
MachineBasicBlock::iterator MBBI = MBB.begin();
MachineFrameInfo *MFI = MF.getFrameInfo();
MachineInstr *MI;
+ unsigned oldSize = MBB.size();
// Get the number of bytes to allocate from the FrameInfo
unsigned NumBytes = MFI->getStackSize();
if (hasFP(MF)) {
// guaranteed to be the last slot by processFunctionBeforeFrameFinalized.
int EBPOffset = MFI->getObjectOffset(MFI->getObjectIndexEnd()-1)+4;
+ if (NumBytes) { // adjust stack pointer: ESP -= numbytes
+ MI= BuildMI(X86::SUBri32, 2, X86::ESP).addReg(X86::ESP).addZImm(NumBytes);
+ MBBI = MBB.insert(MBBI, MI)+1;
+ }
+
+ // Save EBP into the appropriate stack slot...
MI = addRegOffset(BuildMI(X86::MOVrm32, 5), // mov [ESP-<offset>], EBP
- X86::ESP, EBPOffset).addReg(X86::EBP);
+ X86::ESP, EBPOffset+NumBytes).addReg(X86::EBP);
MBBI = MBB.insert(MBBI, MI)+1;
-
- MI = BuildMI(X86::MOVrr32, 2, X86::EBP).addReg(X86::ESP);
+
+ // Update EBP with the new base value...
+ if (NumBytes == 0) // mov EBP, ESP
+ MI = BuildMI(X86::MOVrr32, 2, X86::EBP).addReg(X86::ESP);
+ else // lea EBP, [ESP+StackSize]
+ MI = addRegOffset(BuildMI(X86::LEAr32, 5, X86::EBP), X86::ESP, NumBytes);
+
MBBI = MBB.insert(MBBI, MI)+1;
+
} else {
// When we have no frame pointer, we reserve argument space for call sites
// in the function immediately on entry to the current function. This
// Update frame info to pretend that this is part of the stack...
MFI->setStackSize(NumBytes);
- }
- if (NumBytes) {
- // adjust stack pointer: ESP -= numbytes
- MI = BuildMI(X86::SUBri32, 2, X86::ESP).addReg(X86::ESP).addZImm(NumBytes);
- MBBI = 1+MBB.insert(MBBI, MI);
+ if (NumBytes) {
+ // adjust stack pointer: ESP -= numbytes
+ MI= BuildMI(X86::SUBri32, 2, X86::ESP).addReg(X86::ESP).addZImm(NumBytes);
+ MBB.insert(MBBI, MI);
+ }
}
+ return MBB.size() - oldSize;
}
-void X86RegisterInfo::emitEpilogue(MachineFunction &MF,
- MachineBasicBlock &MBB) const {
+int X86RegisterInfo::emitEpilogue(MachineFunction &MF,
+ MachineBasicBlock &MBB) const {
+ unsigned oldSize = MBB.size();
const MachineFrameInfo *MFI = MF.getFrameInfo();
MachineBasicBlock::iterator MBBI = MBB.end()-1;
MachineInstr *MI;
MBBI = 1+MBB.insert(MBBI, MI);
}
}
+ return MBB.size() - oldSize;
}
+} // End llvm namespace
+
#include "X86GenRegisterInfo.inc"
+namespace llvm {
+
const TargetRegisterClass*
X86RegisterInfo::getRegClassForType(const Type* Ty) const {
switch (Ty->getPrimitiveID()) {
case Type::DoubleTyID: return &RFPInstance;
}
}
+
+} // End llvm namespace
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