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When emitting implicit use/def lists, only emit each unique list once. Though

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LLVM is able to merge identical static const globals, GCC isn't, and this caused
some bloat in the generated data.  This has a marginal effect on PPC, shrinking
the implicit sets from 10->4, but shrinks X86 from 179 to 23, a much bigger
reduction.

This should speed up the register allocator as well by reducing the dcache
footprint for this static data.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22879 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-08-18 21:36:47 +00:00
parent 068ca15d5e
commit a3ac88d8ab
2 changed files with 47 additions and 20 deletions
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59
utils/TableGen/InstrInfoEmitter.cpp
View File

@ -46,14 +46,21 @@ void InstrInfoEmitter::runEnums(std::ostream &OS) {
OS << "} // End llvm namespace \n";
}
void InstrInfoEmitter::printDefList(ListInit *LI, const std::string &Name,
std::ostream &OS) const {
OS << "static const unsigned " << Name << "[] = { ";
for (unsigned j = 0, e = LI->getSize(); j != e; ++j)
if (DefInit *DI = dynamic_cast<DefInit*>(LI->getElement(j)))
OS << getQualifiedName(DI->getDef()) << ", ";
static std::vector<Record*> GetDefList(ListInit *LI, const std::string &Name) {
std::vector<Record*> Result;
for (unsigned i = 0, e = LI->getSize(); i != e; ++i)
if (DefInit *DI = dynamic_cast<DefInit*>(LI->getElement(i)))
Result.push_back(DI->getDef());
else
throw "Illegal value in '" + Name + "' list!";
return Result;
}
void InstrInfoEmitter::printDefList(const std::vector<Record*> &Uses,
unsigned Num, std::ostream &OS) const {
OS << "static const unsigned ImplicitList" << Num << "[] = { ";
for (unsigned i = 0, e = Uses.size(); i != e; ++i)
OS << getQualifiedName(Uses[i]) << ", ";
OS << "0 };\n";
}
@ -69,34 +76,50 @@ void InstrInfoEmitter::run(std::ostream &OS) {
Record *PHI = InstrInfo->getValueAsDef("PHIInst");
// Emit empty implicit uses and defs lists
OS << "static const unsigned EmptyImpUses[] = { 0 };\n"
<< "static const unsigned EmptyImpDefs[] = { 0 };\n";
OS << "static const unsigned EmptyImpList[] = { 0 };\n";
// Emit all of the instruction's implicit uses and defs...
// Keep track of all of the def lists we have emitted already.
std::map<std::vector<Record*>, unsigned> EmittedLists;
std::map<ListInit*, unsigned> ListNumbers;
unsigned ListNumber = 0;
// Emit all of the instruction's implicit uses and defs.
for (CodeGenTarget::inst_iterator II = Target.inst_begin(),
E = Target.inst_end(); II != E; ++II) {
Record *Inst = II->second.TheDef;
ListInit *LI = Inst->getValueAsListInit("Uses");
if (LI->getSize()) printDefList(LI, Inst->getName()+"ImpUses", OS);
if (LI->getSize()) {
std::vector<Record*> Uses = GetDefList(LI, Inst->getName());
unsigned &IL = EmittedLists[Uses];
if (!IL) printDefList(Uses, IL = ++ListNumber, OS);
ListNumbers[LI] = IL;
}
LI = Inst->getValueAsListInit("Defs");
if (LI->getSize()) printDefList(LI, Inst->getName()+"ImpDefs", OS);
if (LI->getSize()) {
std::vector<Record*> Uses = GetDefList(LI, Inst->getName());
unsigned &IL = EmittedLists[Uses];
if (!IL) printDefList(Uses, IL = ++ListNumber, OS);
ListNumbers[LI] = IL;
}
}
OS << "\nstatic const TargetInstrDescriptor " << TargetName
<< "Insts[] = {\n";
emitRecord(Target.getPHIInstruction(), 0, InstrInfo, OS);
emitRecord(Target.getPHIInstruction(), 0, InstrInfo, ListNumbers, OS);
unsigned i = 0;
for (CodeGenTarget::inst_iterator II = Target.inst_begin(),
E = Target.inst_end(); II != E; ++II)
if (II->second.TheDef != PHI)
emitRecord(II->second, ++i, InstrInfo, OS);
emitRecord(II->second, ++i, InstrInfo, ListNumbers, OS);
OS << "};\n";
OS << "} // End llvm namespace \n";
}
void InstrInfoEmitter::emitRecord(const CodeGenInstruction &Inst, unsigned Num,
Record *InstrInfo, std::ostream &OS) {
Record *InstrInfo,
std::map<ListInit*, unsigned> &ListNumbers,
std::ostream &OS) {
OS << " { \"";
if (Inst.Name.empty())
OS << Inst.TheDef->getName();
@ -134,15 +157,15 @@ void InstrInfoEmitter::emitRecord(const CodeGenInstruction &Inst, unsigned Num,
// Emit the implicit uses and defs lists...
LI = Inst.TheDef->getValueAsListInit("Uses");
if (!LI->getSize())
OS << "EmptyImpUses, ";
OS << "EmptyImpList, ";
else
OS << Inst.TheDef->getName() << "ImpUses, ";
OS << "ImplicitList" << ListNumbers[LI] << ", ";
LI = Inst.TheDef->getValueAsListInit("Defs");
if (!LI->getSize())
OS << "EmptyImpDefs ";
OS << "EmptyImpList ";
else
OS << Inst.TheDef->getName() << "ImpDefs ";
OS << "ImplicitList" << ListNumbers[LI] << " ";
OS << " }, // Inst #" << Num << " = " << Inst.TheDef->getName() << "\n";
}

8
utils/TableGen/InstrInfoEmitter.h
View File

@ -16,6 +16,8 @@
#define INSTRINFO_EMITTER_H
#include "TableGenBackend.h"
#include <vector>
#include <map>
namespace llvm {
@ -35,10 +37,12 @@ public:
// runEnums - Print out enum values for all of the instructions.
void runEnums(std::ostream &OS);
private:
void printDefList(ListInit *LI, const std::string &Name,
void printDefList(const std::vector<Record*> &Uses, unsigned Num,
std::ostream &OS) const;
void emitRecord(const CodeGenInstruction &Inst, unsigned Num,
Record *InstrInfo, std::ostream &OS);
Record *InstrInfo,
std::map<ListInit*, unsigned> &ListNumbers,
std::ostream &OS);
void emitShiftedValue(Record *R, StringInit *Val, IntInit *Shift,
std::ostream &OS);
};