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//===- SystemZRegisterInfo.cpp - SystemZ Register Information -------*- C++ -*-===//
//
// 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 SystemZ implementation of the TargetRegisterInfo class.
//
//===----------------------------------------------------------------------===//
#include "SystemZ.h"
#include "SystemZInstrInfo.h"
#include "SystemZMachineFunctionInfo.h"
#include "SystemZRegisterInfo.h"
#include "SystemZSubtarget.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/Target/TargetFrameInfo.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/ADT/BitVector.h"
using namespace llvm;
SystemZRegisterInfo::SystemZRegisterInfo(SystemZTargetMachine &tm,
const SystemZInstrInfo &tii)
: SystemZGenRegisterInfo(SystemZ::ADJCALLSTACKUP, SystemZ::ADJCALLSTACKDOWN),
TM(tm), TII(tii) {
}
const unsigned*
SystemZRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
static const unsigned CalleeSavedRegs[] = {
SystemZ::R6D, SystemZ::R7D, SystemZ::R8D, SystemZ::R9D,
SystemZ::R10D, SystemZ::R11D, SystemZ::R12D, SystemZ::R13D,
SystemZ::R14D, SystemZ::R15D,
SystemZ::F8L, SystemZ::F9L, SystemZ::F10L, SystemZ::F11L,
SystemZ::F12L, SystemZ::F13L, SystemZ::F14L, SystemZ::F15L,
0
};
return CalleeSavedRegs;
}
BitVector SystemZRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
BitVector Reserved(getNumRegs());
const TargetFrameInfo *TFI = MF.getTarget().getFrameInfo();
if (TFI->hasFP(MF))
Reserved.set(SystemZ::R11D);
Reserved.set(SystemZ::R14D);
Reserved.set(SystemZ::R15D);
return Reserved;
}
void SystemZRegisterInfo::
eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const {
MBB.erase(I);
}
int SystemZRegisterInfo::getFrameIndexOffset(const MachineFunction &MF,
int FI) const {
const TargetFrameInfo &TFI = *MF.getTarget().getFrameInfo();
const MachineFrameInfo *MFI = MF.getFrameInfo();
const SystemZMachineFunctionInfo *SystemZMFI =
MF.getInfo<SystemZMachineFunctionInfo>();
int Offset = MFI->getObjectOffset(FI) + MFI->getOffsetAdjustment();
uint64_t StackSize = MFI->getStackSize();
// Fixed objects are really located in the "previous" frame.
if (FI < 0)
StackSize -= SystemZMFI->getCalleeSavedFrameSize();
Offset += StackSize - TFI.getOffsetOfLocalArea();
// Skip the register save area if we generated the stack frame.
if (StackSize || MFI->hasCalls())
Offset -= TFI.getOffsetOfLocalArea();
return Offset;
}
void
SystemZRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
int SPAdj, RegScavenger *RS) const {
assert(SPAdj == 0 && "Unxpected");
unsigned i = 0;
MachineInstr &MI = *II;
MachineFunction &MF = *MI.getParent()->getParent();
const TargetFrameInfo *TFI = MF.getTarget().getFrameInfo();
while (!MI.getOperand(i).isFI()) {
++i;
assert(i < MI.getNumOperands() && "Instr doesn't have FrameIndex operand!");
}
int FrameIndex = MI.getOperand(i).getIndex();
unsigned BasePtr = (TFI->hasFP(MF) ? SystemZ::R11D : SystemZ::R15D);
// This must be part of a rri or ri operand memory reference. Replace the
// FrameIndex with base register with BasePtr. Add an offset to the
// displacement field.
MI.getOperand(i).ChangeToRegister(BasePtr, false);
// Offset is a either 12-bit unsigned or 20-bit signed integer.
// FIXME: handle "too long" displacements.
int Offset =
getFrameIndexOffset(MF, FrameIndex) + MI.getOperand(i+1).getImm();
// Check whether displacement is too long to fit into 12 bit zext field.
MI.setDesc(TII.getMemoryInstr(MI.getOpcode(), Offset));
MI.getOperand(i+1).ChangeToImmediate(Offset);
}
void
SystemZRegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
RegScavenger *RS) const {
// Determine whether R15/R14 will ever be clobbered inside the function. And
// if yes - mark it as 'callee' saved.
MachineFrameInfo *FFI = MF.getFrameInfo();
MachineRegisterInfo &MRI = MF.getRegInfo();
// Check whether high FPRs are ever used, if yes - we need to save R15 as
// well.
static const unsigned HighFPRs[] = {
SystemZ::F8L, SystemZ::F9L, SystemZ::F10L, SystemZ::F11L,
SystemZ::F12L, SystemZ::F13L, SystemZ::F14L, SystemZ::F15L,
SystemZ::F8S, SystemZ::F9S, SystemZ::F10S, SystemZ::F11S,
SystemZ::F12S, SystemZ::F13S, SystemZ::F14S, SystemZ::F15S,
};
bool HighFPRsUsed = false;
for (unsigned i = 0, e = array_lengthof(HighFPRs); i != e; ++i)
HighFPRsUsed |= MRI.isPhysRegUsed(HighFPRs[i]);
if (FFI->hasCalls())
/* FIXME: function is varargs */
/* FIXME: function grabs RA */
/* FIXME: function calls eh_return */
MRI.setPhysRegUsed(SystemZ::R14D);
if (HighFPRsUsed ||
FFI->hasCalls() ||
FFI->getObjectIndexEnd() != 0 || // Contains automatic variables
FFI->hasVarSizedObjects() // Function calls dynamic alloca's
/* FIXME: function is varargs */)
MRI.setPhysRegUsed(SystemZ::R15D);
}
unsigned SystemZRegisterInfo::getRARegister() const {
assert(0 && "What is the return address register");
return 0;
}
unsigned
SystemZRegisterInfo::getFrameRegister(const MachineFunction &MF) const {
assert(0 && "What is the frame register");
return 0;
}
unsigned SystemZRegisterInfo::getEHExceptionRegister() const {
assert(0 && "What is the exception register");
return 0;
}
unsigned SystemZRegisterInfo::getEHHandlerRegister() const {
assert(0 && "What is the exception handler register");
return 0;
}
int SystemZRegisterInfo::getDwarfRegNum(unsigned RegNum, bool isEH) const {
assert(0 && "What is the dwarf register number");
return -1;
}
#include "SystemZGenRegisterInfo.inc"
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