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Refactor a bunch of FastISelEmitter code into a helper class, and 

put each major step in a separate function. This makes the high
level sequence of events easier to follow.

llvm-svn: 55385
This commit is contained in:
Dan Gohman 2008-08-26 21:21:20 +00:00
parent b5e04bfb18
commit 44003cc354
2 changed files with 63 additions and 29 deletions
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90
llvm/utils/TableGen/FastISelEmitter.cpp
View File

@ -161,6 +161,25 @@ struct InstructionMemo {
const CodeGenRegisterClass *RC;
};
class FastISelMap {
typedef std::map<std::string, InstructionMemo> PredMap;
typedef std::map<MVT::SimpleValueType, PredMap> RetPredMap;
typedef std::map<MVT::SimpleValueType, RetPredMap> TypeRetPredMap;
typedef std::map<std::string, TypeRetPredMap> OpcodeTypeRetPredMap;
typedef std::map<OperandsSignature, OpcodeTypeRetPredMap> OperandsOpcodeTypeRetPredMap;
OperandsOpcodeTypeRetPredMap SimplePatterns;
std::string InstNS;
public:
explicit FastISelMap(std::string InstNS);
void CollectPatterns(CodeGenDAGPatterns &CGP);
void PrintClass(std::ostream &OS);
void PrintFunctionDefinitions(std::ostream &OS);
};
}
static std::string getOpcodeName(Record *Op, CodeGenDAGPatterns &CGP) {
@ -174,23 +193,16 @@ static std::string getLegalCName(std::string OpName) {
return OpName;
}
void FastISelEmitter::run(std::ostream &OS) {
EmitSourceFileHeader("\"Fast\" Instruction Selector for the " +
Target.getName() + " target", OS);
FastISelMap::FastISelMap(std::string instns)
: InstNS(instns) {
}
OS << "#include \"llvm/CodeGen/FastISel.h\"\n";
OS << "\n";
OS << "namespace llvm {\n";
OS << "\n";
OS << "namespace " << InstNS.substr(0, InstNS.size() - 2) << " {\n";
OS << "\n";
typedef std::map<std::string, InstructionMemo> PredMap;
typedef std::map<MVT::SimpleValueType, PredMap> RetPredMap;
typedef std::map<MVT::SimpleValueType, RetPredMap> TypeRetPredMap;
typedef std::map<std::string, TypeRetPredMap> OpcodeTypeRetPredMap;
typedef std::map<OperandsSignature, OpcodeTypeRetPredMap> OperandsOpcodeTypeRetPredMap;
OperandsOpcodeTypeRetPredMap SimplePatterns;
void FastISelMap::CollectPatterns(CodeGenDAGPatterns &CGP) {
const CodeGenTarget &Target = CGP.getTargetInfo();
// Determine the target's namespace name.
InstNS = Target.getInstNamespace() + "::";
assert(InstNS.size() > 2 && "Can't determine target-specific namespace!");
// Scan through all the patterns and record the simple ones.
for (CodeGenDAGPatterns::ptm_iterator I = CGP.ptm_begin(),
@ -255,7 +267,9 @@ void FastISelEmitter::run(std::ostream &OS) {
"Duplicate pattern!");
SimplePatterns[Operands][OpcodeName][VT][RetVT][PredicateCheck] = Memo;
}
}
void FastISelMap::PrintClass(std::ostream &OS) {
// Declare the target FastISel class.
OS << "class FastISel : public llvm::FastISel {\n";
for (OperandsOpcodeTypeRetPredMap::const_iterator OI = SimplePatterns.begin(),
@ -328,13 +342,9 @@ void FastISelEmitter::run(std::ostream &OS) {
<< "Subtarget>()) {}\n";
OS << "};\n";
OS << "\n";
}
// Define the target FastISel creation function.
OS << "llvm::FastISel *createFastISel(MachineFunction &mf) {\n";
OS << " return new FastISel(mf);\n";
OS << "}\n";
OS << "\n";
void FastISelMap::PrintFunctionDefinitions(std::ostream &OS) {
// Now emit code for all the patterns that we collected.
for (OperandsOpcodeTypeRetPredMap::const_iterator OI = SimplePatterns.begin(),
OE = SimplePatterns.end(); OI != OE; ++OI) {
@ -536,6 +546,35 @@ void FastISelEmitter::run(std::ostream &OS) {
OS << "}\n";
OS << "\n";
}
}
void FastISelEmitter::run(std::ostream &OS) {
const CodeGenTarget &Target = CGP.getTargetInfo();
// Determine the target's namespace name.
std::string InstNS = Target.getInstNamespace() + "::";
assert(InstNS.size() > 2 && "Can't determine target-specific namespace!");
EmitSourceFileHeader("\"Fast\" Instruction Selector for the " +
Target.getName() + " target", OS);
OS << "#include \"llvm/CodeGen/FastISel.h\"\n";
OS << "\n";
OS << "namespace llvm {\n";
OS << "\n";
OS << "namespace " << InstNS.substr(0, InstNS.size() - 2) << " {\n";
OS << "\n";
FastISelMap F(InstNS);
F.CollectPatterns(CGP);
F.PrintClass(OS);
F.PrintFunctionDefinitions(OS);
// Define the target FastISel creation function.
OS << "llvm::FastISel *createFastISel(MachineFunction &mf) {\n";
OS << " return new FastISel(mf);\n";
OS << "}\n";
OS << "\n";
OS << "} // namespace X86\n";
OS << "\n";
@ -544,9 +583,6 @@ void FastISelEmitter::run(std::ostream &OS) {
FastISelEmitter::FastISelEmitter(RecordKeeper &R)
: Records(R),
CGP(R),
Target(CGP.getTargetInfo()),
InstNS(Target.getInstNamespace() + "::") {
assert(InstNS.size() > 2 && "Can't determine target-specific namespace!");
CGP(R) {
}

2
llvm/utils/TableGen/FastISelEmitter.h
View File

@ -27,8 +27,6 @@ class CodeGenTarget;
class FastISelEmitter : public TableGenBackend {
RecordKeeper &Records;
CodeGenDAGPatterns CGP;
const CodeGenTarget &Target;
const std::string InstNS;
public:
explicit FastISelEmitter(RecordKeeper &R);