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https://github.com/c64scene-ar/llvm-6502.git
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cb90de37a7
loading a 32bit constant into a register whose low halfword is all zeroes.
We now omit the ori after the lis for the following C code:
int bar(int y) { return y * 0x00F0000; }
_bar:
.LBB_bar_0: ; entry
; IMPLICIT_DEF
lis r2, 15
mullw r3, r3, r2
blr
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16825 91177308-0d34-0410-b5e6-96231b3b80d8
71 lines
2.7 KiB
C++
71 lines
2.7 KiB
C++
//===- PPC32InstrInfo.cpp - PowerPC32 Instruction Information ---*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the PowerPC implementation of the TargetInstrInfo class.
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//
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//===----------------------------------------------------------------------===//
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#include "PPC32InstrInfo.h"
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#include "PPC32GenInstrInfo.inc"
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#include "PowerPC.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include <iostream>
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using namespace llvm;
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PPC32InstrInfo::PPC32InstrInfo()
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: TargetInstrInfo(PPC32Insts, sizeof(PPC32Insts)/sizeof(PPC32Insts[0])) {}
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bool PPC32InstrInfo::isMoveInstr(const MachineInstr& MI,
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unsigned& sourceReg,
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unsigned& destReg) const {
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MachineOpCode oc = MI.getOpcode();
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if (oc == PPC::OR) { // or r1, r2, r2
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assert(MI.getNumOperands() == 3 &&
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MI.getOperand(0).isRegister() &&
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MI.getOperand(1).isRegister() &&
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MI.getOperand(2).isRegister() &&
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"invalid PPC OR instruction!");
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if (MI.getOperand(1).getReg() == MI.getOperand(2).getReg()) {
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sourceReg = MI.getOperand(1).getReg();
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destReg = MI.getOperand(0).getReg();
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return true;
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}
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} else if (oc == PPC::ADDI) { // addi r1, r2, 0
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assert(MI.getNumOperands() == 3 &&
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MI.getOperand(0).isRegister() &&
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MI.getOperand(2).isImmediate() &&
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"invalid PPC ADDI instruction!");
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if (MI.getOperand(1).isRegister() && MI.getOperand(2).getImmedValue()==0) {
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sourceReg = MI.getOperand(1).getReg();
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destReg = MI.getOperand(0).getReg();
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return true;
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}
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} else if (oc == PPC::ORI) { // ori r1, r2, 0
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assert(MI.getNumOperands() == 3 &&
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MI.getOperand(0).isRegister() &&
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MI.getOperand(1).isRegister() &&
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MI.getOperand(2).isImmediate() &&
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"invalid PPC ORI instruction!");
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if (MI.getOperand(2).getImmedValue()==0) {
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sourceReg = MI.getOperand(1).getReg();
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destReg = MI.getOperand(0).getReg();
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return true;
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}
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} else if (oc == PPC::FMR) { // fmr r1, r2
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assert(MI.getNumOperands() == 2 &&
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MI.getOperand(0).isRegister() &&
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MI.getOperand(1).isRegister() &&
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"invalid PPC FMR instruction");
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sourceReg = MI.getOperand(1).getReg();
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destReg = MI.getOperand(0).getReg();
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return true;
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}
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return false;
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}
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