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enhance the intrinsic info stuff to emit encodings that don't fit in 32-bits into a

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separate side table, using the handy SequenceToOffsetTable class.  This encodes all
these weird things into another 256 bytes, allowing all intrinsics to be encoded this way.

llvm-svn: 156995
This commit is contained in:
Chris Lattner 2012-05-17 15:55:41 +00:00
parent fc7737e7dc
commit 3d3d2be19b
3 changed files with 96 additions and 182 deletions
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37
lib/VMCore/Function.cpp
View File

@ -419,31 +419,34 @@ static Type *DecodeFixedType(unsigned &NextElt, ArrayRef<unsigned char> Infos,
FunctionType *Intrinsic::getType(LLVMContext &Context,
ID id, ArrayRef<Type*> Tys) {
Type *ResultTy = 0;
SmallVector<Type*, 8> ArgTys;
// Check to see if the intrinsic's type was expressible by the table.
unsigned TableVal = IIT_Table[id-1];
if (TableVal != ~0U) {
// Decode the TableVal into an array of IITValues.
SmallVector<unsigned char, 8> IITValues;
// Decode the TableVal into an array of IITValues.
SmallVector<unsigned char, 8> IITValues;
ArrayRef<unsigned char> IITEntries;
unsigned NextElt = 0;
if ((TableVal >> 31) != 0) {
// This is an offset into the IIT_LongEncodingTable.
IITEntries = IIT_LongEncodingTable;
// Strip sentinel bit.
NextElt = (TableVal << 1) >> 1;
} else {
do {
IITValues.push_back(TableVal & 0xF);
TableVal >>= 4;
} while (TableVal);
unsigned NextElt = 0;
ResultTy = DecodeFixedType(NextElt, IITValues, Tys, Context);
while (NextElt != IITValues.size())
ArgTys.push_back(DecodeFixedType(NextElt, IITValues, Tys, Context));
return FunctionType::get(ResultTy, ArgTys, false);
IITEntries = IITValues;
NextElt = 0;
}
#define GET_INTRINSIC_GENERATOR
#include "llvm/Intrinsics.gen"
#undef GET_INTRINSIC_GENERATOR
Type *ResultTy = DecodeFixedType(NextElt, IITEntries, Tys, Context);
SmallVector<Type*, 8> ArgTys;
while (NextElt != IITEntries.size() && IITEntries[NextElt] != 0)
ArgTys.push_back(DecodeFixedType(NextElt, IITEntries, Tys, Context));
return FunctionType::get(ResultTy, ArgTys, false);
}

239
utils/TableGen/IntrinsicEmitter.cpp
View File

@ -13,6 +13,7 @@
#include "CodeGenTarget.h"
#include "IntrinsicEmitter.h"
#include "SequenceToOffsetTable.h"
#include "llvm/TableGen/Record.h"
#include "llvm/TableGen/StringMatcher.h"
#include "llvm/ADT/StringExtras.h"
@ -308,97 +309,6 @@ void IntrinsicEmitter::EmitVerifier(const std::vector<CodeGenIntrinsic> &Ints,
OS << "#endif\n\n";
}
static void EmitTypeForValueType(raw_ostream &OS, MVT::SimpleValueType VT) {
if (EVT(VT).isInteger()) {
unsigned BitWidth = EVT(VT).getSizeInBits();
OS << "IntegerType::get(Context, " << BitWidth << ")";
} else if (VT == MVT::Other) {
// MVT::OtherVT is used to mean the empty struct type here.
OS << "StructType::get(Context)";
} else if (VT == MVT::f16) {
OS << "Type::getHalfTy(Context)";
} else if (VT == MVT::f32) {
OS << "Type::getFloatTy(Context)";
} else if (VT == MVT::f64) {
OS << "Type::getDoubleTy(Context)";
} else if (VT == MVT::f128) {
OS << "Type::getFP128Ty(Context)";
} else if (VT == MVT::ppcf128) {
OS << "Type::getPPC_FP128Ty(Context)";
} else if (VT == MVT::isVoid) {
OS << "Type::getVoidTy(Context)";
} else if (VT == MVT::Metadata) {
OS << "Type::getMetadataTy(Context)";
} else if (VT == MVT::x86mmx) {
OS << "Type::getX86_MMXTy(Context)";
} else {
assert(false && "Unsupported ValueType!");
}
}
static void EmitTypeGenerate(raw_ostream &OS, const Record *ArgType,
unsigned &ArgNo);
static void EmitTypeGenerate(raw_ostream &OS,
const std::vector<Record*> &ArgTypes,
unsigned &ArgNo) {
if (ArgTypes.empty())
return EmitTypeForValueType(OS, MVT::isVoid);
if (ArgTypes.size() == 1)
return EmitTypeGenerate(OS, ArgTypes.front(), ArgNo);
OS << "StructType::get(";
for (std::vector<Record*>::const_iterator
I = ArgTypes.begin(), E = ArgTypes.end(); I != E; ++I) {
EmitTypeGenerate(OS, *I, ArgNo);
OS << ", ";
}
OS << " NULL)";
}
static void EmitTypeGenerate(raw_ostream &OS, const Record *ArgType,
unsigned &ArgNo) {
MVT::SimpleValueType VT = getValueType(ArgType->getValueAsDef("VT"));
if (ArgType->isSubClassOf("LLVMMatchType")) {
unsigned Number = ArgType->getValueAsInt("Number");
assert(Number < ArgNo && "Invalid matching number!");
if (ArgType->isSubClassOf("LLVMExtendedElementVectorType"))
OS << "VectorType::getExtendedElementVectorType"
<< "(cast<VectorType>(Tys[" << Number << "]))";
else if (ArgType->isSubClassOf("LLVMTruncatedElementVectorType"))
OS << "VectorType::getTruncatedElementVectorType"
<< "(cast<VectorType>(Tys[" << Number << "]))";
else
OS << "Tys[" << Number << "]";
} else if (VT == MVT::iAny || VT == MVT::fAny || VT == MVT::vAny ||
VT == MVT::iPTRAny) {
// NOTE: The ArgNo variable here is not the absolute argument number, it is
// the index of the "arbitrary" type in the Tys array passed to the
// Intrinsic::getDeclaration function. Consequently, we only want to
// increment it when we actually hit an overloaded type. Getting this wrong
// leads to very subtle bugs!
OS << "Tys[" << ArgNo++ << "]";
} else if (EVT(VT).isVector()) {
EVT VVT = VT;
OS << "VectorType::get(";
EmitTypeForValueType(OS, VVT.getVectorElementType().getSimpleVT().SimpleTy);
OS << ", " << VVT.getVectorNumElements() << ")";
} else if (VT == MVT::iPTR) {
OS << "PointerType::getUnqual(";
EmitTypeGenerate(OS, ArgType->getValueAsDef("ElTy"), ArgNo);
OS << ")";
} else if (VT == MVT::isVoid) {
assert(ArgNo == 0);
OS << "Type::getVoidTy(Context)";
} else {
EmitTypeForValueType(OS, VT);
}
}
// NOTE: This must be kept in synch with the version emitted to the .gen file!
enum IIT_Info {
@ -433,7 +343,7 @@ enum IIT_Info {
static void EncodeFixedValueType(MVT::SimpleValueType VT,
SmallVectorImpl<unsigned> &Sig) {
std::vector<unsigned char> &Sig) {
if (EVT(VT).isInteger()) {
unsigned BitWidth = EVT(VT).getSizeInBits();
switch (BitWidth) {
@ -462,7 +372,7 @@ static void EncodeFixedValueType(MVT::SimpleValueType VT,
#endif
static void EncodeFixedType(Record *R, unsigned &NextArgNo,
SmallVectorImpl<unsigned> &Sig) {
std::vector<unsigned char> &Sig) {
if (R->isSubClassOf("LLVMMatchType")) {
unsigned Number = R->getValueAsInt("Number");
@ -515,10 +425,10 @@ static void EncodeFixedType(Record *R, unsigned &NextArgNo,
/// ComputeFixedEncoding - If we can encode the type signature for this
/// intrinsic into 32 bits, return it. If not, return ~0U.
static unsigned ComputeFixedEncoding(const CodeGenIntrinsic &Int) {
static void ComputeFixedEncoding(const CodeGenIntrinsic &Int,
std::vector<unsigned char> &TypeSig) {
unsigned NextArgNo = 0;
SmallVector<unsigned, 8> TypeSig;
if (Int.IS.RetVTs.empty())
TypeSig.push_back(IIT_Done);
else if (Int.IS.RetVTs.size() == 1 &&
@ -526,33 +436,24 @@ static unsigned ComputeFixedEncoding(const CodeGenIntrinsic &Int) {
TypeSig.push_back(IIT_Done);
else {
switch (Int.IS.RetVTs.size()) {
case 1: break;
case 2: TypeSig.push_back(IIT_STRUCT2); break;
case 3: TypeSig.push_back(IIT_STRUCT3); break;
case 4: TypeSig.push_back(IIT_STRUCT4); break;
case 5: TypeSig.push_back(IIT_STRUCT5); break;
default: assert(0 && "Unhandled case in struct");
case 1: break;
case 2: TypeSig.push_back(IIT_STRUCT2); break;
case 3: TypeSig.push_back(IIT_STRUCT3); break;
case 4: TypeSig.push_back(IIT_STRUCT4); break;
case 5: TypeSig.push_back(IIT_STRUCT5); break;
default: assert(0 && "Unhandled case in struct");
}
for (unsigned i = 0, e = Int.IS.RetVTs.size(); i != e; ++i)
EncodeFixedType(Int.IS.RetTypeDefs[i], NextArgNo, TypeSig);
}
for (unsigned i = 0, e = Int.IS.ParamTypeDefs.size(); i != e; ++i)
EncodeFixedType(Int.IS.ParamTypeDefs[i], NextArgNo, TypeSig);
// Can only encode 8 nibbles into a 32-bit word.
if (TypeSig.size() > 8) return ~0U;
unsigned Result = 0;
for (unsigned i = 0, e = TypeSig.size(); i != e; ++i) {
// If we had an unencodable argument, bail out.
if (TypeSig[i] > 15)
return ~0U;
Result = (Result << 4) | TypeSig[e-i-1];
}
return Result;
}
void printIITEntry(raw_ostream &OS, unsigned char X) {
OS << (unsigned)X;
}
void IntrinsicEmitter::EmitGenerator(const std::vector<CodeGenIntrinsic> &Ints,
@ -588,73 +489,81 @@ void IntrinsicEmitter::EmitGenerator(const std::vector<CodeGenIntrinsic> &Ints,
OS << "};\n\n";
// Similar to GET_INTRINSIC_VERIFIER, batch up cases that have identical
// types.
typedef std::map<RecPair, std::vector<unsigned>, RecordListComparator> MapTy;
MapTy UniqueArgInfos;
// If we can compute a 32-bit fixed encoding for this intrinsic, do so and
// capture it in this vector, otherwise store a ~0U.
std::vector<unsigned> FixedEncodings;
SequenceToOffsetTable<std::vector<unsigned char> > LongEncodingTable;
std::vector<unsigned char> TypeSig;
// Compute the unique argument type info.
for (unsigned i = 0, e = Ints.size(); i != e; ++i) {
FixedEncodings.push_back(ComputeFixedEncoding(Ints[i]));
// If we didn't compute a compact encoding, emit a long-form variant.
if (FixedEncodings.back() == ~0U)
UniqueArgInfos[make_pair(Ints[i].IS.RetTypeDefs,
Ints[i].IS.ParamTypeDefs)].push_back(i);
// Get the signature for the intrinsic.
TypeSig.clear();
ComputeFixedEncoding(Ints[i], TypeSig);
// Check to see if we can encode it into a 32-bit word. We can only encode
// 8 nibbles into a 32-bit word.
if (TypeSig.size() <= 8) {
bool Failed = false;
unsigned Result = 0;
for (unsigned i = 0, e = TypeSig.size(); i != e; ++i) {
// If we had an unencodable argument, bail out.
if (TypeSig[i] > 15) {
Failed = true;
break;
}
Result = (Result << 4) | TypeSig[e-i-1];
}
// If this could be encoded into a 31-bit word, return it.
if (!Failed && (Result >> 31) == 0) {
FixedEncodings.push_back(Result);
continue;
}
}
// Otherwise, we're going to unique the sequence into the
// LongEncodingTable, and use its offset in the 32-bit table instead.
LongEncodingTable.add(TypeSig);
// This is a placehold that we'll replace after the table is laid out.
FixedEncodings.push_back(~0U);
}
LongEncodingTable.layout();
OS << "static const unsigned IIT_Table[] = {\n ";
for (unsigned i = 0, e = FixedEncodings.size(); i != e; ++i) {
if ((i & 7) == 7)
OS << "\n ";
if (FixedEncodings[i] == ~0U)
OS << "~0U, ";
else
// If the entry fit in the table, just emit it.
if (FixedEncodings[i] != ~0U) {
OS << "0x" << utohexstr(FixedEncodings[i]) << ", ";
}
OS << "0\n};\n\n#endif\n\n"; // End of GET_INTRINSTIC_GENERATOR_GLOBAL
OS << "// Code for generating Intrinsic function declarations.\n";
OS << "#ifdef GET_INTRINSIC_GENERATOR\n";
OS << " switch (id) {\n";
OS << " default: llvm_unreachable(\"Invalid intrinsic!\");\n";
// Loop through the array, emitting one generator for each batch.
std::string IntrinsicStr = TargetPrefix + "Intrinsic::";
for (MapTy::iterator I = UniqueArgInfos.begin(),
E = UniqueArgInfos.end(); I != E; ++I) {
for (unsigned i = 0, e = I->second.size(); i != e; ++i)
OS << " case " << IntrinsicStr << Ints[I->second[i]].EnumName
<< ":\t\t// " << Ints[I->second[i]].Name << "\n";
const RecPair &ArgTypes = I->first;
const std::vector<Record*> &RetTys = ArgTypes.first;
const std::vector<Record*> &ParamTys = ArgTypes.second;
unsigned N = ParamTys.size();
unsigned ArgNo = 0;
OS << " ResultTy = ";
EmitTypeGenerate(OS, RetTys, ArgNo);
OS << ";\n";
for (unsigned j = 0; j != N; ++j) {
OS << " ArgTys.push_back(";
EmitTypeGenerate(OS, ParamTys[j], ArgNo);
OS << ");\n";
continue;
}
TypeSig.clear();
ComputeFixedEncoding(Ints[i], TypeSig);
OS << " break;\n";
// Otherwise, emit the offset into the long encoding table. We emit it this
// way so that it is easier to read the offset in the .def file.
OS << "(1U<<31) | " << LongEncodingTable.get(TypeSig) << ", ";
}
OS << " }\n";
OS << "#endif\n\n";
OS << "0\n};\n\n";
// Emit the shared table of register lists.
OS << "static const unsigned char IIT_LongEncodingTable[] = {\n";
if (!LongEncodingTable.empty())
LongEncodingTable.emit(OS, printIITEntry);
OS << " 255\n};\n\n";
OS << "#endif\n\n"; // End of GET_INTRINSTIC_GENERATOR_GLOBAL
}
namespace {

2
utils/TableGen/SequenceToOffsetTable.h
View File

@ -81,6 +81,8 @@ public:
Seqs.erase(I);
}
bool empty() const { return Seqs.empty(); }
/// layout - Computes the final table layout.
void layout() {
assert(Entries == 0 && "Can only call layout() once");