mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-11-04 05:17:07 +00:00
d0fde30ce8
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9903 91177308-0d34-0410-b5e6-96231b3b80d8
277 lines
9.8 KiB
C++
277 lines
9.8 KiB
C++
//===-- DAGBuilder.cpp - Turn an LLVM BasicBlock into a DAG for selection -===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file was developed by the LLVM research group and is distributed under
|
|
// the University of Illinois Open Source License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file turns an LLVM BasicBlock into a target independent SelectionDAG in
|
|
// preparation for target specific optimizations and instruction selection.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/CodeGen/SelectionDAG.h"
|
|
#include "llvm/Constants.h"
|
|
#include "llvm/Function.h"
|
|
#include "llvm/Instructions.h"
|
|
#include "llvm/Type.h"
|
|
#include "llvm/CodeGen/MachineFunction.h"
|
|
#include "llvm/Target/TargetMachine.h"
|
|
#include "llvm/Support/InstVisitor.h"
|
|
|
|
namespace llvm {
|
|
|
|
struct SelectionDAGBuilder : public InstVisitor<SelectionDAGBuilder> {
|
|
// DAG - the current dag we are building.
|
|
SelectionDAG &DAG;
|
|
|
|
// SDTB - The target-specific builder interface, which indicates how to expand
|
|
// extremely target-specific aspects of the representation, such as function
|
|
// calls and arguments.
|
|
SelectionDAGTargetBuilder &SDTB;
|
|
|
|
// BB - The current machine basic block we are working on.
|
|
MachineBasicBlock *BB;
|
|
|
|
// CurRoot - The root built for the current basic block.
|
|
SelectionDAGNode *CurRoot;
|
|
|
|
SelectionDAGBuilder(SelectionDAG &dag, SelectionDAGTargetBuilder &sdtb)
|
|
: DAG(dag), SDTB(sdtb), BB(0), CurRoot(0) {}
|
|
|
|
void visitBB(BasicBlock &bb);
|
|
|
|
// Visitation methods for instructions: Create the appropriate DAG nodes for
|
|
// the instruction.
|
|
void visitAdd(BinaryOperator &BO);
|
|
void visitSub(BinaryOperator &BO);
|
|
void visitMul(BinaryOperator &BO);
|
|
|
|
void visitAnd(BinaryOperator &BO);
|
|
void visitOr (BinaryOperator &BO);
|
|
void visitXor(BinaryOperator &BO);
|
|
|
|
void visitSetEQ(BinaryOperator &BO);
|
|
|
|
void visitLoad(LoadInst &LI);
|
|
void visitCall(CallInst &CI);
|
|
|
|
void visitBr(BranchInst &BI);
|
|
void visitRet(ReturnInst &RI);
|
|
|
|
void visitInstruction(Instruction &I) {
|
|
std::cerr << "DAGBuilder: Cannot instruction select: " << I;
|
|
abort();
|
|
}
|
|
|
|
private:
|
|
SelectionDAGNode *getNodeFor(Value *V);
|
|
SelectionDAGNode *getNodeFor(Value &V) { return getNodeFor(&V); }
|
|
|
|
SelectionDAGNode *addSeqNode(SelectionDAGNode *N);
|
|
};
|
|
|
|
/// addSeqNode - The same as addNode, but the node is also included in the
|
|
/// sequence nodes for this block. This method should be called for any
|
|
/// instructions which have a specified sequence they must be evaluated in.
|
|
///
|
|
SelectionDAGNode *SelectionDAGBuilder::addSeqNode(SelectionDAGNode *N) {
|
|
DAG.addNode(N); // First, add the node to the selection DAG
|
|
|
|
if (!CurRoot)
|
|
CurRoot = N;
|
|
else {
|
|
// Create and add a new chain node for the existing root and this node...
|
|
CurRoot = DAG.addNode(new SelectionDAGNode(ISD::ChainNode, MVT::isVoid,
|
|
BB, CurRoot, N));
|
|
}
|
|
return N;
|
|
}
|
|
|
|
/// getNodeFor - This method returns the SelectionDAGNode for the specified LLVM
|
|
/// value, creating a node as necessary.
|
|
///
|
|
SelectionDAGNode *SelectionDAGBuilder::getNodeFor(Value *V) {
|
|
// If we already have the entry, return it.
|
|
SelectionDAGNode*& Entry = DAG.ValueMap[V];
|
|
if (Entry) return Entry;
|
|
|
|
// Otherwise, we need to create a node to return now... start by figuring out
|
|
// which type the node will be...
|
|
MVT::ValueType ValueType = DAG.getValueType(V->getType());
|
|
|
|
if (Instruction *I = dyn_cast<Instruction>(V))
|
|
// Instructions will be filled in later. For now, just create and return a
|
|
// dummy node.
|
|
return Entry = new SelectionDAGNode(ISD::ProtoNode, ValueType);
|
|
|
|
if (Constant *C = dyn_cast<Constant>(V)) {
|
|
if (ConstantBool *CB = dyn_cast<ConstantBool>(C)) {
|
|
Entry = new SelectionDAGNode(ISD::Constant, ValueType);
|
|
Entry->addValue(new ReducedValue_Constant_i1(CB->getValue()));
|
|
} else if (ConstantInt *CI = dyn_cast<ConstantInt>(C)) {
|
|
Entry = new SelectionDAGNode(ISD::Constant, ValueType);
|
|
switch (ValueType) {
|
|
case MVT::i8:
|
|
Entry->addValue(new ReducedValue_Constant_i8(CI->getRawValue()));
|
|
break;
|
|
case MVT::i16:
|
|
Entry->addValue(new ReducedValue_Constant_i16(CI->getRawValue()));
|
|
break;
|
|
case MVT::i32:
|
|
Entry->addValue(new ReducedValue_Constant_i32(CI->getRawValue()));
|
|
break;
|
|
case MVT::i64:
|
|
Entry->addValue(new ReducedValue_Constant_i64(CI->getRawValue()));
|
|
break;
|
|
default:
|
|
assert(0 && "Invalid ValueType for an integer constant!");
|
|
}
|
|
|
|
} else if (ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
|
|
Entry = new SelectionDAGNode(ISD::Constant, ValueType);
|
|
if (ValueType == MVT::f32)
|
|
Entry->addValue(new ReducedValue_Constant_f32(CFP->getValue()));
|
|
else
|
|
Entry->addValue(new ReducedValue_Constant_f64(CFP->getValue()));
|
|
}
|
|
if (Entry) return Entry;
|
|
} else if (BasicBlock *BB = dyn_cast<BasicBlock>(V)) {
|
|
Entry = new SelectionDAGNode(ISD::BasicBlock, ValueType);
|
|
Entry->addValue(new ReducedValue_BasicBlock_i32(DAG.BlockMap[BB]));
|
|
return Entry;
|
|
}
|
|
|
|
std::cerr << "Unhandled LLVM value in DAG Builder!: " << *V << "\n";
|
|
abort();
|
|
return 0;
|
|
}
|
|
|
|
|
|
// visitBB - This method is used to visit a basic block in the program. It
|
|
// manages the CurRoot instance variable so that all of the visit(Instruction)
|
|
// methods can be written to assume that there is only one basic block being
|
|
// constructed.
|
|
//
|
|
void SelectionDAGBuilder::visitBB(BasicBlock &bb) {
|
|
BB = DAG.BlockMap[&bb]; // Update BB instance var
|
|
|
|
// Save the current global DAG...
|
|
SelectionDAGNode *OldRoot = CurRoot;
|
|
CurRoot = 0;
|
|
|
|
visit(bb.begin(), bb.end()); // Visit all of the instructions...
|
|
|
|
if (OldRoot) {
|
|
if (!CurRoot)
|
|
CurRoot = OldRoot; // This block had no root of its own..
|
|
else {
|
|
// The previous basic block AND this basic block had roots, insert a
|
|
// block chain node now...
|
|
CurRoot = DAG.addNode(new SelectionDAGNode(ISD::BlockChainNode,
|
|
MVT::isVoid,
|
|
BB, OldRoot, CurRoot));
|
|
}
|
|
}
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// ...Visitation Methods...
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
void SelectionDAGBuilder::visitAdd(BinaryOperator &BO) {
|
|
getNodeFor(BO)->setNode(ISD::Plus, BB, getNodeFor(BO.getOperand(0)),
|
|
getNodeFor(BO.getOperand(1)));
|
|
}
|
|
void SelectionDAGBuilder::visitSub(BinaryOperator &BO) {
|
|
getNodeFor(BO)->setNode(ISD::Minus, BB, getNodeFor(BO.getOperand(0)),
|
|
getNodeFor(BO.getOperand(1)));
|
|
}
|
|
void SelectionDAGBuilder::visitMul(BinaryOperator &BO) {
|
|
getNodeFor(BO)->setNode(ISD::Times, BB, getNodeFor(BO.getOperand(0)),
|
|
getNodeFor(BO.getOperand(1)));
|
|
}
|
|
|
|
void SelectionDAGBuilder::visitAnd(BinaryOperator &BO) {
|
|
getNodeFor(BO)->setNode(ISD::And, BB, getNodeFor(BO.getOperand(0)),
|
|
getNodeFor(BO.getOperand(1)));
|
|
}
|
|
void SelectionDAGBuilder::visitOr(BinaryOperator &BO) {
|
|
getNodeFor(BO)->setNode(ISD::Or, BB, getNodeFor(BO.getOperand(0)),
|
|
getNodeFor(BO.getOperand(1)));
|
|
}
|
|
void SelectionDAGBuilder::visitXor(BinaryOperator &BO) {
|
|
getNodeFor(BO)->setNode(ISD::Xor, BB, getNodeFor(BO.getOperand(0)),
|
|
getNodeFor(BO.getOperand(1)));
|
|
}
|
|
void SelectionDAGBuilder::visitSetEQ(BinaryOperator &BO) {
|
|
getNodeFor(BO)->setNode(ISD::SetEQ, BB, getNodeFor(BO.getOperand(0)),
|
|
getNodeFor(BO.getOperand(1)));
|
|
}
|
|
|
|
|
|
void SelectionDAGBuilder::visitRet(ReturnInst &RI) {
|
|
if (RI.getNumOperands()) { // Value return
|
|
addSeqNode(new SelectionDAGNode(ISD::Ret, MVT::isVoid, BB,
|
|
getNodeFor(RI.getOperand(0))));
|
|
} else { // Void return
|
|
addSeqNode(new SelectionDAGNode(ISD::RetVoid, MVT::isVoid, BB));
|
|
}
|
|
}
|
|
|
|
|
|
void SelectionDAGBuilder::visitBr(BranchInst &BI) {
|
|
if (BI.isUnconditional())
|
|
addSeqNode(new SelectionDAGNode(ISD::Br, MVT::isVoid, BB,
|
|
getNodeFor(BI.getOperand(0))));
|
|
else
|
|
addSeqNode(new SelectionDAGNode(ISD::BrCond, MVT::isVoid, BB,
|
|
getNodeFor(BI.getCondition()),
|
|
getNodeFor(BI.getSuccessor(0)),
|
|
getNodeFor(BI.getSuccessor(1))));
|
|
}
|
|
|
|
|
|
void SelectionDAGBuilder::visitLoad(LoadInst &LI) {
|
|
// FIXME: this won't prevent reordering of loads!
|
|
getNodeFor(LI)->setNode(ISD::Load, BB, getNodeFor(LI.getOperand(0)));
|
|
}
|
|
|
|
void SelectionDAGBuilder::visitCall(CallInst &CI) {
|
|
SDTB.expandCall(DAG, CI);
|
|
}
|
|
|
|
|
|
|
|
// SelectionDAG constructor - Just use the SelectionDAGBuilder to do all of the
|
|
// dirty work...
|
|
SelectionDAG::SelectionDAG(MachineFunction &f, const TargetMachine &tm,
|
|
SelectionDAGTargetBuilder &SDTB)
|
|
: F(f), TM(tm) {
|
|
|
|
switch (TM.getTargetData().getPointerSize()) {
|
|
default: assert(0 && "Unknown pointer size!"); abort();
|
|
case 8: PointerType = MVT::i8; break;
|
|
case 16: PointerType = MVT::i16; break;
|
|
case 32: PointerType = MVT::i32; break;
|
|
case 64: PointerType = MVT::i64; break;
|
|
}
|
|
|
|
// Create all of the machine basic blocks for the function... building the
|
|
// BlockMap. This map is used for PHI node conversion.
|
|
const Function &Fn = *F.getFunction();
|
|
for (Function::const_iterator I = Fn.begin(), E = Fn.end(); I != E; ++I)
|
|
F.getBasicBlockList().push_back(BlockMap[I] = new MachineBasicBlock(I));
|
|
|
|
SDTB.expandArguments(*this);
|
|
|
|
SelectionDAGBuilder SDB(*this, SDTB);
|
|
for (Function::const_iterator I = Fn.begin(), E = Fn.end(); I != E; ++I)
|
|
SDB.visitBB(const_cast<BasicBlock&>(*I));
|
|
Root = SDB.CurRoot;
|
|
}
|
|
|
|
} // End llvm namespace
|