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Detect best type for some static index tables instead of just using uint32_t to reduce total data size. 

llvm-svn: 222643
This commit is contained in:
Craig Topper 2014-11-24 02:08:35 +00:00
parent 79f226e780
commit ba6d83e64b
1 changed files with 24 additions and 15 deletions
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39
llvm/utils/TableGen/AsmWriterEmitter.cpp
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@ -520,6 +520,15 @@ void AsmWriterEmitter::EmitPrintInstruction(raw_ostream &O) {
O << "}\n";
}
static const char *getMinimalTypeForRange(uint64_t Range) {
assert(Range < 0xFFFFFFFFULL && "Enum too large");
if (Range > 0xFFFF)
return "uint32_t";
if (Range > 0xFF)
return "uint16_t";
return "uint8_t";
}
static void
emitRegisterNameString(raw_ostream &O, StringRef AltName,
const std::vector<CodeGenRegister*> &Registers) {
@ -564,7 +573,8 @@ emitRegisterNameString(raw_ostream &O, StringRef AltName,
StringTable.emit(O, printChar);
O << " };\n\n";
O << " static const uint32_t RegAsmOffset" << AltName << "[] = {";
O << " static const " << getMinimalTypeForRange(StringTable.size()-1)
<< " RegAsmOffset" << AltName << "[] = {";
for (unsigned i = 0, e = Registers.size(); i != e; ++i) {
if ((i % 14) == 0)
O << "\n ";
@ -602,26 +612,25 @@ void AsmWriterEmitter::EmitGetRegisterName(raw_ostream &O) {
emitRegisterNameString(O, "", Registers);
if (hasAltNames) {
O << " const uint32_t *RegAsmOffset;\n"
<< " const char *AsmStrs;\n"
<< " switch(AltIdx) {\n"
O << " switch(AltIdx) {\n"
<< " default: llvm_unreachable(\"Invalid register alt name index!\");\n";
for (unsigned i = 0, e = AltNameIndices.size(); i < e; ++i) {
std::string Namespace = AltNameIndices[1]->getValueAsString("Namespace");
std::string AltName(AltNameIndices[i]->getName());
O << " case " << Namespace << "::" << AltName
<< ":\n"
<< " AsmStrs = AsmStrs" << AltName << ";\n"
<< " RegAsmOffset = RegAsmOffset" << AltName << ";\n"
<< " break;\n";
O << " case " << Namespace << "::" << AltName << ":\n"
<< " assert(*(AsmStrs" << AltName << "+RegAsmOffset"
<< AltName << "[RegNo-1]) &&\n"
<< " \"Invalid alt name index for register!\");\n"
<< " return AsmStrs" << AltName << "+RegAsmOffset"
<< AltName << "[RegNo-1];\n";
}
O << "}\n";
O << " }\n";
} else {
O << " assert (*(AsmStrs+RegAsmOffset[RegNo-1]) &&\n"
<< " \"Invalid alt name index for register!\");\n"
<< " return AsmStrs+RegAsmOffset[RegNo-1];\n";
}
O << " assert (*(AsmStrs+RegAsmOffset[RegNo-1]) &&\n"
<< " \"Invalid alt name index for register!\");\n"
<< " return AsmStrs+RegAsmOffset[RegNo-1];\n"
<< "}\n";
O << "}\n";
}
namespace {