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Add more indirection to the disassembler tables to reduce amount of space used to store the operand types and encodings. Store only the unique combinations in a separate table and store indices in the instruction table. Saves about 32K of static data.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161101 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Craig Topper
2012-08-01 07:39:18 +00:00
parent adfe2637b8
commit 5a2c607153
7 changed files with 71 additions and 42 deletions
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80
utils/TableGen/X86DisassemblerTables.cpp
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@ -21,6 +21,7 @@
#include "llvm/ADT/STLExtras.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Format.h"
#include <map>
using namespace llvm;
using namespace X86Disassembler;
@ -424,48 +425,71 @@ void DisassemblerTables::emitContextDecision(raw_ostream &o1, raw_ostream &o2,
void DisassemblerTables::emitInstructionInfo(raw_ostream &o,
unsigned &i) const {
unsigned NumInstructions = InstructionSpecifiers.size();
o << "static const struct OperandSpecifier x86OperandSets[]["
<< X86_MAX_OPERANDS << "] = {\n";
typedef std::vector<std::pair<const char *, const char *> > OperandListTy;
std::map<OperandListTy, unsigned> OperandSets;
unsigned OperandSetNum = 0;
for (unsigned Index = 0; Index < NumInstructions; ++Index) {
OperandListTy OperandList;
for (unsigned OperandIndex = 0; OperandIndex < X86_MAX_OPERANDS;
++OperandIndex) {
const char *Encoding =
stringForOperandEncoding((OperandEncoding)InstructionSpecifiers[Index]
.operands[OperandIndex].encoding);
const char *Type =
stringForOperandType((OperandType)InstructionSpecifiers[Index]
.operands[OperandIndex].type);
OperandList.push_back(std::make_pair(Encoding, Type));
}
unsigned &N = OperandSets[OperandList];
if (N != 0) continue;
N = ++OperandSetNum;
o << " { /* " << (OperandSetNum - 1) << " */\n";
for (unsigned i = 0, e = OperandList.size(); i != e; ++i) {
o << " { " << OperandList[i].first << ", "
<< OperandList[i].second << " },\n";
}
o << " },\n";
}
o << "};" << "\n\n";
o.indent(i * 2) << "static const struct InstructionSpecifier ";
o << INSTRUCTIONS_STR "[" << InstructionSpecifiers.size() << "] = {\n";
i++;
unsigned numInstructions = InstructionSpecifiers.size();
for (unsigned index = 0; index < numInstructions; ++index) {
for (unsigned index = 0; index < NumInstructions; ++index) {
o.indent(i * 2) << "{ /* " << index << " */" << "\n";
i++;
o.indent(i * 2) << stringForModifierType(
(ModifierType)InstructionSpecifiers[index].modifierType);
o << "," << "\n";
o << ",\n";
o.indent(i * 2) << "0x";
o << format("%02hhx", (uint16_t)InstructionSpecifiers[index].modifierBase);
o << "," << "\n";
o << ",\n";
o.indent(i * 2) << "{" << "\n";
i++;
for (unsigned operandIndex = 0; operandIndex < X86_MAX_OPERANDS;
++operandIndex) {
o.indent(i * 2) << "{ ";
o <<stringForOperandEncoding((OperandEncoding)InstructionSpecifiers[index]
.operands[operandIndex]
.encoding);
o << ", ";
o << stringForOperandType((OperandType)InstructionSpecifiers[index]
.operands[operandIndex]
.type);
o << " }";
if (operandIndex < X86_MAX_OPERANDS - 1)
o << ",";
o << "\n";
OperandListTy OperandList;
for (unsigned OperandIndex = 0; OperandIndex < X86_MAX_OPERANDS;
++OperandIndex) {
const char *Encoding =
stringForOperandEncoding((OperandEncoding)InstructionSpecifiers[index]
.operands[OperandIndex].encoding);
const char *Type =
stringForOperandType((OperandType)InstructionSpecifiers[index]
.operands[OperandIndex].type);
OperandList.push_back(std::make_pair(Encoding, Type));
}
i--;
o.indent(i * 2) << "}," << "\n";
o.indent(i * 2) << (OperandSets[OperandList] - 1) << ",\n";
o.indent(i * 2) << "/* " << InstructionSpecifiers[index].name << " */";
o << "\n";
@ -473,7 +497,7 @@ void DisassemblerTables::emitInstructionInfo(raw_ostream &o,
i--;
o.indent(i * 2) << "}";
if (index + 1 < numInstructions)
if (index + 1 < NumInstructions)
o << ",";
o << "\n";