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https://github.com/c64scene-ar/llvm-6502.git
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718cb665ca
Patch by Sterling Stein! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41758 91177308-0d34-0410-b5e6-96231b3b80d8
268 lines
8.2 KiB
C++
268 lines
8.2 KiB
C++
//===- AlphaInstrInfo.cpp - Alpha 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 Alpha implementation of the TargetInstrInfo class.
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//
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//===----------------------------------------------------------------------===//
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#include "Alpha.h"
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#include "AlphaInstrInfo.h"
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#include "AlphaGenInstrInfo.inc"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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using namespace llvm;
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AlphaInstrInfo::AlphaInstrInfo()
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: TargetInstrInfo(AlphaInsts, array_lengthof(AlphaInsts)),
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RI(*this) { }
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bool AlphaInstrInfo::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 == Alpha::BISr ||
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oc == Alpha::CPYSS ||
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oc == Alpha::CPYST ||
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oc == Alpha::CPYSSt ||
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oc == Alpha::CPYSTs) {
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// or r1, r2, r2
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// cpys(s|t) 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 Alpha BIS 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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}
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return false;
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}
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unsigned
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AlphaInstrInfo::isLoadFromStackSlot(MachineInstr *MI, int &FrameIndex) const {
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switch (MI->getOpcode()) {
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case Alpha::LDL:
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case Alpha::LDQ:
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case Alpha::LDBU:
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case Alpha::LDWU:
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case Alpha::LDS:
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case Alpha::LDT:
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if (MI->getOperand(1).isFrameIndex()) {
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FrameIndex = MI->getOperand(1).getFrameIndex();
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return MI->getOperand(0).getReg();
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}
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break;
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}
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return 0;
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}
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unsigned
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AlphaInstrInfo::isStoreToStackSlot(MachineInstr *MI, int &FrameIndex) const {
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switch (MI->getOpcode()) {
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case Alpha::STL:
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case Alpha::STQ:
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case Alpha::STB:
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case Alpha::STW:
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case Alpha::STS:
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case Alpha::STT:
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if (MI->getOperand(1).isFrameIndex()) {
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FrameIndex = MI->getOperand(1).getFrameIndex();
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return MI->getOperand(0).getReg();
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}
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break;
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}
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return 0;
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}
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static bool isAlphaIntCondCode(unsigned Opcode) {
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switch (Opcode) {
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case Alpha::BEQ:
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case Alpha::BNE:
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case Alpha::BGE:
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case Alpha::BGT:
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case Alpha::BLE:
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case Alpha::BLT:
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case Alpha::BLBC:
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case Alpha::BLBS:
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return true;
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default:
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return false;
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}
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}
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unsigned AlphaInstrInfo::InsertBranch(MachineBasicBlock &MBB,MachineBasicBlock *TBB,
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MachineBasicBlock *FBB,
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const std::vector<MachineOperand> &Cond)const{
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assert(TBB && "InsertBranch must not be told to insert a fallthrough");
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assert((Cond.size() == 2 || Cond.size() == 0) &&
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"Alpha branch conditions have two components!");
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// One-way branch.
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if (FBB == 0) {
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if (Cond.empty()) // Unconditional branch
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BuildMI(&MBB, get(Alpha::BR)).addMBB(TBB);
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else // Conditional branch
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if (isAlphaIntCondCode(Cond[0].getImm()))
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BuildMI(&MBB, get(Alpha::COND_BRANCH_I))
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.addImm(Cond[0].getImm()).addReg(Cond[1].getReg()).addMBB(TBB);
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else
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BuildMI(&MBB, get(Alpha::COND_BRANCH_F))
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.addImm(Cond[0].getImm()).addReg(Cond[1].getReg()).addMBB(TBB);
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return 1;
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}
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// Two-way Conditional Branch.
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if (isAlphaIntCondCode(Cond[0].getImm()))
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BuildMI(&MBB, get(Alpha::COND_BRANCH_I))
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.addImm(Cond[0].getImm()).addReg(Cond[1].getReg()).addMBB(TBB);
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else
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BuildMI(&MBB, get(Alpha::COND_BRANCH_F))
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.addImm(Cond[0].getImm()).addReg(Cond[1].getReg()).addMBB(TBB);
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BuildMI(&MBB, get(Alpha::BR)).addMBB(FBB);
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return 2;
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}
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static unsigned AlphaRevCondCode(unsigned Opcode) {
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switch (Opcode) {
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case Alpha::BEQ: return Alpha::BNE;
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case Alpha::BNE: return Alpha::BEQ;
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case Alpha::BGE: return Alpha::BLT;
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case Alpha::BGT: return Alpha::BLE;
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case Alpha::BLE: return Alpha::BGT;
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case Alpha::BLT: return Alpha::BGE;
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case Alpha::BLBC: return Alpha::BLBS;
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case Alpha::BLBS: return Alpha::BLBC;
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case Alpha::FBEQ: return Alpha::FBNE;
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case Alpha::FBNE: return Alpha::FBEQ;
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case Alpha::FBGE: return Alpha::FBLT;
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case Alpha::FBGT: return Alpha::FBLE;
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case Alpha::FBLE: return Alpha::FBGT;
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case Alpha::FBLT: return Alpha::FBGE;
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default:
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assert(0 && "Unknown opcode");
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}
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}
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// Branch analysis.
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bool AlphaInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,MachineBasicBlock *&TBB,
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MachineBasicBlock *&FBB,
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std::vector<MachineOperand> &Cond) const {
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// If the block has no terminators, it just falls into the block after it.
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MachineBasicBlock::iterator I = MBB.end();
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if (I == MBB.begin() || !isUnpredicatedTerminator(--I))
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return false;
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// Get the last instruction in the block.
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MachineInstr *LastInst = I;
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// If there is only one terminator instruction, process it.
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if (I == MBB.begin() || !isUnpredicatedTerminator(--I)) {
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if (LastInst->getOpcode() == Alpha::BR) {
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TBB = LastInst->getOperand(0).getMachineBasicBlock();
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return false;
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} else if (LastInst->getOpcode() == Alpha::COND_BRANCH_I ||
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LastInst->getOpcode() == Alpha::COND_BRANCH_F) {
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// Block ends with fall-through condbranch.
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TBB = LastInst->getOperand(2).getMachineBasicBlock();
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Cond.push_back(LastInst->getOperand(0));
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Cond.push_back(LastInst->getOperand(1));
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return false;
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}
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// Otherwise, don't know what this is.
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return true;
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}
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// Get the instruction before it if it's a terminator.
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MachineInstr *SecondLastInst = I;
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// If there are three terminators, we don't know what sort of block this is.
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if (SecondLastInst && I != MBB.begin() &&
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isUnpredicatedTerminator(--I))
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return true;
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// If the block ends with Alpha::BR and Alpha::COND_BRANCH_*, handle it.
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if ((SecondLastInst->getOpcode() == Alpha::COND_BRANCH_I ||
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SecondLastInst->getOpcode() == Alpha::COND_BRANCH_F) &&
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LastInst->getOpcode() == Alpha::BR) {
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TBB = SecondLastInst->getOperand(2).getMachineBasicBlock();
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Cond.push_back(SecondLastInst->getOperand(0));
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Cond.push_back(SecondLastInst->getOperand(1));
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FBB = LastInst->getOperand(0).getMachineBasicBlock();
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return false;
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}
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// If the block ends with two Alpha::BRs, handle it. The second one is not
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// executed, so remove it.
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if (SecondLastInst->getOpcode() == Alpha::BR &&
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LastInst->getOpcode() == Alpha::BR) {
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TBB = SecondLastInst->getOperand(0).getMachineBasicBlock();
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I = LastInst;
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I->eraseFromParent();
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return false;
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}
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// Otherwise, can't handle this.
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return true;
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}
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unsigned AlphaInstrInfo::RemoveBranch(MachineBasicBlock &MBB) const {
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MachineBasicBlock::iterator I = MBB.end();
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if (I == MBB.begin()) return 0;
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--I;
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if (I->getOpcode() != Alpha::BR &&
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I->getOpcode() != Alpha::COND_BRANCH_I &&
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I->getOpcode() != Alpha::COND_BRANCH_F)
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return 0;
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// Remove the branch.
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I->eraseFromParent();
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I = MBB.end();
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if (I == MBB.begin()) return 1;
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--I;
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if (I->getOpcode() != Alpha::COND_BRANCH_I &&
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I->getOpcode() != Alpha::COND_BRANCH_F)
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return 1;
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// Remove the branch.
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I->eraseFromParent();
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return 2;
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}
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void AlphaInstrInfo::insertNoop(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI) const {
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BuildMI(MBB, MI, get(Alpha::BISr), Alpha::R31).addReg(Alpha::R31)
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.addReg(Alpha::R31);
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}
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bool AlphaInstrInfo::BlockHasNoFallThrough(MachineBasicBlock &MBB) const {
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if (MBB.empty()) return false;
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switch (MBB.back().getOpcode()) {
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case Alpha::RETDAG: // Return.
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case Alpha::RETDAGp:
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case Alpha::BR: // Uncond branch.
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case Alpha::JMP: // Indirect branch.
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return true;
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default: return false;
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}
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}
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bool AlphaInstrInfo::
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ReverseBranchCondition(std::vector<MachineOperand> &Cond) const {
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assert(Cond.size() == 2 && "Invalid Alpha branch opcode!");
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Cond[0].setImm(AlphaRevCondCode(Cond[0].getImm()));
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return false;
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}
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