mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-27 13:30:05 +00:00
325e66d81a
2. Remove unused function. 3. Correct indentation. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131028 91177308-0d34-0410-b5e6-96231b3b80d8
81 lines
2.2 KiB
C++
81 lines
2.2 KiB
C++
//===-- MipsEmitGPRestore.cpp - Emit GP restore instruction----------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This pass emits instructions that restore $gp right
|
|
// after jalr instructions.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#define DEBUG_TYPE "emit-gp-restore"
|
|
|
|
#include "Mips.h"
|
|
#include "MipsTargetMachine.h"
|
|
#include "MipsMachineFunction.h"
|
|
#include "llvm/CodeGen/MachineFunctionPass.h"
|
|
#include "llvm/CodeGen/MachineInstrBuilder.h"
|
|
#include "llvm/Target/TargetInstrInfo.h"
|
|
#include "llvm/ADT/Statistic.h"
|
|
|
|
using namespace llvm;
|
|
|
|
namespace {
|
|
struct Inserter : public MachineFunctionPass {
|
|
|
|
TargetMachine &TM;
|
|
const TargetInstrInfo *TII;
|
|
|
|
static char ID;
|
|
Inserter(TargetMachine &tm)
|
|
: MachineFunctionPass(ID), TM(tm), TII(tm.getInstrInfo()) { }
|
|
|
|
virtual const char *getPassName() const {
|
|
return "Mips Emit GP Restore";
|
|
}
|
|
|
|
bool runOnMachineFunction(MachineFunction &F);
|
|
};
|
|
char Inserter::ID = 0;
|
|
} // end of anonymous namespace
|
|
|
|
bool Inserter::runOnMachineFunction(MachineFunction &F) {
|
|
if (TM.getRelocationModel() != Reloc::PIC_)
|
|
return false;
|
|
|
|
bool Changed = false;
|
|
int FI = F.getInfo<MipsFunctionInfo>()->getGPFI();
|
|
|
|
for (MachineFunction::iterator MFI = F.begin(), MFE = F.end();
|
|
MFI != MFE; ++MFI) {
|
|
MachineBasicBlock& MBB = *MFI;
|
|
MachineBasicBlock::iterator I = MFI->begin();
|
|
|
|
while (I != MFI->end()) {
|
|
if (I->getOpcode() != Mips::JALR) {
|
|
++I;
|
|
continue;
|
|
}
|
|
|
|
DebugLoc dl = I->getDebugLoc();
|
|
// emit lw $gp, ($gp save slot on stack) after jalr
|
|
BuildMI(MBB, ++I, dl, TII->get(Mips::LW), Mips::GP).addImm(0)
|
|
.addFrameIndex(FI);
|
|
Changed = true;
|
|
}
|
|
}
|
|
|
|
return Changed;
|
|
}
|
|
|
|
/// createMipsEmitGPRestorePass - Returns a pass that emits instructions that
|
|
/// restores $gp clobbered by jalr instructions.
|
|
FunctionPass *llvm::createMipsEmitGPRestorePass(MipsTargetMachine &tm) {
|
|
return new Inserter(tm);
|
|
}
|
|
|