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https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11973 91177308-0d34-0410-b5e6-96231b3b80d8
153 lines
5.0 KiB
C++
153 lines
5.0 KiB
C++
//===-- InstSelectSimple.cpp - A simple instruction selector for SparcV8 --===//
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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 defines a simple peephole instruction selector for the V8 target
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//
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//===----------------------------------------------------------------------===//
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#include "SparcV8.h"
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#include "llvm/Instructions.h"
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#include "llvm/IntrinsicLowering.h"
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#include "llvm/Pass.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Support/GetElementPtrTypeIterator.h"
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#include "llvm/Support/InstVisitor.h"
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#include "llvm/Support/CFG.h"
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using namespace llvm;
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namespace {
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struct V8ISel : public FunctionPass, public InstVisitor<V8ISel> {
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TargetMachine &TM;
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MachineFunction *F; // The function we are compiling into
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MachineBasicBlock *BB; // The current MBB we are compiling
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std::map<Value*, unsigned> RegMap; // Mapping between Val's and SSA Regs
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// MBBMap - Mapping between LLVM BB -> Machine BB
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std::map<const BasicBlock*, MachineBasicBlock*> MBBMap;
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V8ISel(TargetMachine &tm) : TM(tm), F(0), BB(0) {}
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/// runOnFunction - Top level implementation of instruction selection for
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/// the entire function.
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///
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bool runOnFunction(Function &Fn);
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virtual const char *getPassName() const {
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return "SparcV8 Simple Instruction Selection";
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}
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/// visitBasicBlock - This method is called when we are visiting a new basic
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/// block. This simply creates a new MachineBasicBlock to emit code into
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/// and adds it to the current MachineFunction. Subsequent visit* for
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/// instructions will be invoked for all instructions in the basic block.
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///
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void visitBasicBlock(BasicBlock &LLVM_BB) {
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BB = MBBMap[&LLVM_BB];
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}
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void visitReturnInst(ReturnInst &RI);
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void visitInstruction(Instruction &I) {
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std::cerr << "Unhandled instruction: " << I;
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abort();
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}
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/// LowerUnknownIntrinsicFunctionCalls - This performs a prepass over the
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/// function, lowering any calls to unknown intrinsic functions into the
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/// equivalent LLVM code.
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void LowerUnknownIntrinsicFunctionCalls(Function &F);
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void visitIntrinsicCall(Intrinsic::ID ID, CallInst &CI);
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};
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}
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FunctionPass *llvm::createSparcV8SimpleInstructionSelector(TargetMachine &TM) {
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return new V8ISel(TM);
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}
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bool V8ISel::runOnFunction(Function &Fn) {
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// First pass over the function, lower any unknown intrinsic functions
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// with the IntrinsicLowering class.
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LowerUnknownIntrinsicFunctionCalls(Fn);
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F = &MachineFunction::construct(&Fn, TM);
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// Create all of the machine basic blocks for the function...
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for (Function::iterator I = Fn.begin(), E = Fn.end(); I != E; ++I)
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F->getBasicBlockList().push_back(MBBMap[I] = new MachineBasicBlock(I));
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BB = &F->front();
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// Set up a frame object for the return address. This is used by the
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// llvm.returnaddress & llvm.frameaddress intrinisics.
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//ReturnAddressIndex = F->getFrameInfo()->CreateFixedObject(4, -4);
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// Copy incoming arguments off of the stack and out of fixed registers.
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//LoadArgumentsToVirtualRegs(Fn);
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// Instruction select everything except PHI nodes
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visit(Fn);
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// Select the PHI nodes
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//SelectPHINodes();
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RegMap.clear();
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MBBMap.clear();
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F = 0;
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// We always build a machine code representation for the function
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return true;
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}
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void V8ISel::visitReturnInst(ReturnInst &I) {
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if (I.getNumOperands() == 0) {
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// Just emit a 'ret' instruction
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BuildMI(BB, V8::JMPLi, 2, V8::G0).addZImm(8).addReg(V8::I7);
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return;
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}
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visitInstruction(I);
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}
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/// LowerUnknownIntrinsicFunctionCalls - This performs a prepass over the
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/// function, lowering any calls to unknown intrinsic functions into the
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/// equivalent LLVM code.
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void V8ISel::LowerUnknownIntrinsicFunctionCalls(Function &F) {
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for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB)
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for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; )
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if (CallInst *CI = dyn_cast<CallInst>(I++))
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if (Function *F = CI->getCalledFunction())
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switch (F->getIntrinsicID()) {
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case Intrinsic::not_intrinsic: break;
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default:
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// All other intrinsic calls we must lower.
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Instruction *Before = CI->getPrev();
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TM.getIntrinsicLowering().LowerIntrinsicCall(CI);
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if (Before) { // Move iterator to instruction after call
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I = Before; ++I;
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} else {
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I = BB->begin();
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}
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}
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}
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void V8ISel::visitIntrinsicCall(Intrinsic::ID ID, CallInst &CI) {
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unsigned TmpReg1, TmpReg2;
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switch (ID) {
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default: assert(0 && "Intrinsic not supported!");
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}
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}
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