81 lines
3.0 KiB
C++
81 lines
3.0 KiB
C++
|
//===-- SparcFrameLowering.cpp - Sparc Frame Information ------------------===//
|
||
|
|
//
|
||
|
|
// The LLVM Compiler Infrastructure
|
||
|
|
//
|
||
|
|
// This file is distributed under the University of Illinois Open Source
|
||
|
|
// License. See LICENSE.TXT for details.
|
||
|
|
//
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
//
|
||
|
|
// This file contains the Sparc implementation of TargetFrameLowering class.
|
||
|
|
//
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
|
||
|
|
#include "SparcFrameLowering.h"
|
||
|
|
#include "SparcInstrInfo.h"
|
||
|
|
#include "SparcMachineFunctionInfo.h"
|
||
|
|
#include "llvm/Function.h"
|
||
|
|
#include "llvm/CodeGen/MachineFrameInfo.h"
|
||
|
|
#include "llvm/CodeGen/MachineFunction.h"
|
||
|
|
#include "llvm/CodeGen/MachineInstrBuilder.h"
|
||
|
|
#include "llvm/CodeGen/MachineModuleInfo.h"
|
||
|
|
#include "llvm/CodeGen/MachineRegisterInfo.h"
|
||
|
|
#include "llvm/Target/TargetData.h"
|
||
|
|
#include "llvm/Target/TargetOptions.h"
|
||
|
|
#include "llvm/Support/CommandLine.h"
|
||
|
|
|
||
|
|
using namespace llvm;
|
||
|
|
|
||
|
|
void SparcFrameLowering::emitPrologue(MachineFunction &MF) const {
|
||
|
|
MachineBasicBlock &MBB = MF.front();
|
||
|
|
MachineFrameInfo *MFI = MF.getFrameInfo();
|
||
|
|
const SparcInstrInfo &TII =
|
||
|
|
*static_cast<const SparcInstrInfo*>(MF.getTarget().getInstrInfo());
|
||
|
|
MachineBasicBlock::iterator MBBI = MBB.begin();
|
||
|
|
DebugLoc dl = MBBI != MBB.end() ? MBBI->getDebugLoc() : DebugLoc();
|
||
|
|
|
||
|
|
// Get the number of bytes to allocate from the FrameInfo
|
||
|
|
int NumBytes = (int) MFI->getStackSize();
|
||
|
|
|
||
|
|
// Emit the correct save instruction based on the number of bytes in
|
||
|
|
// the frame. Minimum stack frame size according to V8 ABI is:
|
||
|
|
// 16 words for register window spill
|
||
|
|
// 1 word for address of returned aggregate-value
|
||
|
|
// + 6 words for passing parameters on the stack
|
||
|
|
// ----------
|
||
|
|
// 23 words * 4 bytes per word = 92 bytes
|
||
|
|
NumBytes += 92;
|
||
|
|
|
||
|
|
// Round up to next doubleword boundary -- a double-word boundary
|
||
|
|
// is required by the ABI.
|
||
|
|
NumBytes = (NumBytes + 7) & ~7;
|
||
|
|
NumBytes = -NumBytes;
|
||
|
|
|
||
|
|
if (NumBytes >= -4096) {
|
||
|
|
BuildMI(MBB, MBBI, dl, TII.get(SP::SAVEri), SP::O6)
|
||
|
|
.addReg(SP::O6).addImm(NumBytes);
|
||
|
|
} else {
|
||
|
|
// Emit this the hard way. This clobbers G1 which we always know is
|
||
|
|
// available here.
|
||
|
|
unsigned OffHi = (unsigned)NumBytes >> 10U;
|
||
|
|
BuildMI(MBB, MBBI, dl, TII.get(SP::SETHIi), SP::G1).addImm(OffHi);
|
||
|
|
// Emit G1 = G1 + I6
|
||
|
|
BuildMI(MBB, MBBI, dl, TII.get(SP::ORri), SP::G1)
|
||
|
|
.addReg(SP::G1).addImm(NumBytes & ((1 << 10)-1));
|
||
|
|
BuildMI(MBB, MBBI, dl, TII.get(SP::SAVErr), SP::O6)
|
||
|
|
.addReg(SP::O6).addReg(SP::G1);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void SparcFrameLowering::emitEpilogue(MachineFunction &MF,
|
||
|
|
MachineBasicBlock &MBB) const {
|
||
|
|
MachineBasicBlock::iterator MBBI = MBB.getLastNonDebugInstr();
|
||
|
|
const SparcInstrInfo &TII =
|
||
|
|
*static_cast<const SparcInstrInfo*>(MF.getTarget().getInstrInfo());
|
||
|
|
DebugLoc dl = MBBI->getDebugLoc();
|
||
|
|
assert(MBBI->getOpcode() == SP::RETL &&
|
||
|
|
"Can only put epilog before 'retl' instruction!");
|
||
|
|
BuildMI(MBB, MBBI, dl, TII.get(SP::RESTORErr), SP::G0).addReg(SP::G0)
|
||
|
|
.addReg(SP::G0);
|
||
|
|
}
|