mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-02-18 14:31:27 +00:00
75 lines
2.4 KiB
C++
75 lines
2.4 KiB
C++
|
//===-- R600LowerConstCopy.cpp - Propagate ConstCopy / lower them to MOV---===//
|
||
|
|
//
|
||
|
|
// The LLVM Compiler Infrastructure
|
||
|
|
//
|
||
|
|
// This file is distributed under the University of Illinois Open Source
|
||
|
|
// License. See LICENSE.TXT for details.
|
||
|
|
//
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
//
|
||
|
|
/// \file
|
||
|
|
/// This pass is intended to handle remaining ConstCopy pseudo MachineInstr.
|
||
|
|
/// ISel will fold each Const Buffer read inside scalar ALU. However it cannot
|
||
|
|
/// fold them inside vector instruction, like DOT4 or Cube ; ISel emits
|
||
|
|
/// ConstCopy instead. This pass (executed after ExpandingSpecialInstr) will try
|
||
|
|
/// to fold them if possible or replace them by MOV otherwise.
|
||
|
|
/// TODO : Implement the folding part, using Copy Propagation algorithm.
|
||
|
|
//
|
||
|
|
//===----------------------------------------------------------------------===//
|
||
|
|
|
||
|
|
#include "AMDGPU.h"
|
||
|
|
#include "R600InstrInfo.h"
|
||
|
|
#include "llvm/CodeGen/MachineFunction.h"
|
||
|
|
#include "llvm/CodeGen/MachineFunctionPass.h"
|
||
|
|
#include "llvm/CodeGen/MachineInstrBuilder.h"
|
||
|
|
#include "llvm/IR/GlobalValue.h"
|
||
|
|
|
||
|
|
namespace llvm {
|
||
|
|
|
||
|
|
class R600LowerConstCopy : public MachineFunctionPass {
|
||
|
|
private:
|
||
|
|
static char ID;
|
||
|
|
const R600InstrInfo *TII;
|
||
|
|
public:
|
||
|
|
R600LowerConstCopy(TargetMachine &tm);
|
||
|
|
virtual bool runOnMachineFunction(MachineFunction &MF);
|
||
|
|
|
||
|
|
const char *getPassName() const { return "R600 Eliminate Symbolic Operand"; }
|
||
|
|
};
|
||
|
|
|
||
|
|
char R600LowerConstCopy::ID = 0;
|
||
|
|
|
||
|
|
|
||
|
|
R600LowerConstCopy::R600LowerConstCopy(TargetMachine &tm) :
|
||
|
|
MachineFunctionPass(ID),
|
||
|
|
TII (static_cast<const R600InstrInfo *>(tm.getInstrInfo()))
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
bool R600LowerConstCopy::runOnMachineFunction(MachineFunction &MF) {
|
||
|
|
for (MachineFunction::iterator BB = MF.begin(), BB_E = MF.end();
|
||
|
|
BB != BB_E; ++BB) {
|
||
|
|
MachineBasicBlock &MBB = *BB;
|
||
|
|
for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end();
|
||
|
|
I != E;) {
|
||
|
|
MachineInstr &MI = *I;
|
||
|
|
I = llvm::next(I);
|
||
|
|
if (MI.getOpcode() != AMDGPU::CONST_COPY)
|
||
|
|
continue;
|
||
|
|
MachineInstr *NewMI = TII->buildDefaultInstruction(MBB, I, AMDGPU::MOV,
|
||
|
|
MI.getOperand(0).getReg(), AMDGPU::ALU_CONST);
|
||
|
|
NewMI->getOperand(9).setImm(MI.getOperand(1).getImm());
|
||
|
|
MI.eraseFromParent();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
FunctionPass *createR600LowerConstCopy(TargetMachine &tm) {
|
||
|
|
return new R600LowerConstCopy(tm);
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
|