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Use std::bitset for SubtargetFeatures

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Previously, subtarget features were a bitfield with the underlying type being uint64_t. 
Since several targets (X86 and ARM, in particular) have hit or were very close to hitting this bound, switching the features to use a bitset.

No functional change.

Differential Revision: http://reviews.llvm.org/D7065

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229831 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael Kuperstein
2015-02-19 09:01:04 +00:00
parent d6f86b8614
commit 23dd089d8f
33 changed files with 356 additions and 328 deletions
Download Patch File Download Diff File Expand all files Collapse all files
utils/TableGen/SubtargetEmitter.cpp
+36 -52
View File
@@ -16,6 +16,7 @@
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/MC/MCInstrItineraries.h"
#include "llvm/MC/SubtargetFeature.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Format.h"
#include "llvm/TableGen/Error.h"
@@ -62,7 +63,7 @@ class SubtargetEmitter {
CodeGenSchedModels &SchedModels;
std::string Target;
void Enumeration(raw_ostream &OS, const char *ClassName, bool isBits);
void Enumeration(raw_ostream &OS, const char *ClassName);
unsigned FeatureKeyValues(raw_ostream &OS);
unsigned CPUKeyValues(raw_ostream &OS);
void FormItineraryStageString(const std::string &Names,
@@ -112,8 +113,7 @@ public:
// Enumeration - Emit the specified class as an enumeration.
//
void SubtargetEmitter::Enumeration(raw_ostream &OS,
const char *ClassName,
bool isBits) {
const char *ClassName) {
// Get all records of class and sort
std::vector<Record*> DefList = Records.getAllDerivedDefinitions(ClassName);
std::sort(DefList.begin(), DefList.end(), LessRecord());
@@ -121,50 +121,30 @@ void SubtargetEmitter::Enumeration(raw_ostream &OS,
unsigned N = DefList.size();
if (N == 0)
return;
if (N > 64) {
errs() << "Too many (> 64) subtarget features!\n";
if (N > MAX_SUBTARGET_FEATURES) {
errs() << "Too many subtarget features! Bump MAX_SUBTARGET_FEATURES.";
exit(1);
}
OS << "namespace " << Target << " {\n";
// For bit flag enumerations with more than 32 items, emit constants.
// Emit an enum for everything else.
if (isBits && N > 32) {
// For each record
for (unsigned i = 0; i < N; i++) {
// Next record
Record *Def = DefList[i];
// Open enumeration
OS << "enum {\n";
// Get and emit name and expression (1 << i)
OS << " const uint64_t " << Def->getName() << " = 1ULL << " << i << ";\n";
}
} else {
// Open enumeration
OS << "enum {\n";
// For each record
for (unsigned i = 0; i < N;) {
// Next record
Record *Def = DefList[i];
// For each record
for (unsigned i = 0; i < N;) {
// Next record
Record *Def = DefList[i];
// Get and emit name
OS << " " << Def->getName() << " = " << i;
if (++i < N) OS << ",";
// Get and emit name
OS << " " << Def->getName();
// If bit flags then emit expression (1 << i)
if (isBits) OS << " = " << " 1ULL << " << i;
// Depending on 'if more in the list' emit comma
if (++i < N) OS << ",";
OS << "\n";
}
// Close enumeration
OS << "};\n";
OS << "\n";
}
OS << "}\n";
// Close enumeration and namespace
OS << "};\n}\n";
}
//
@@ -198,22 +178,24 @@ unsigned SubtargetEmitter::FeatureKeyValues(raw_ostream &OS) {
if (CommandLineName.empty()) continue;
// Emit as { "feature", "description", featureEnum, i1 | i2 | ... | in }
// Emit as { "feature", "description", { featureEnum }, { i1 , i2 , ... , in } }
OS << " { "
<< "\"" << CommandLineName << "\", "
<< "\"" << Desc << "\", "
<< Target << "::" << Name << ", ";
<< "{ " << Target << "::" << Name << " }, ";
const std::vector<Record*> &ImpliesList =
Feature->getValueAsListOfDefs("Implies");
if (ImpliesList.empty()) {
OS << "0ULL";
OS << "{ }";
} else {
OS << "{ ";
for (unsigned j = 0, M = ImpliesList.size(); j < M;) {
OS << Target << "::" << ImpliesList[j]->getName();
if (++j < M) OS << " | ";
if (++j < M) OS << ", ";
}
OS << " }";
}
OS << " }";
@@ -255,22 +237,24 @@ unsigned SubtargetEmitter::CPUKeyValues(raw_ostream &OS) {
const std::vector<Record*> &FeatureList =
Processor->getValueAsListOfDefs("Features");
// Emit as { "cpu", "description", f1 | f2 | ... fn },
// Emit as { "cpu", "description", { f1 , f2 , ... fn } },
OS << " { "
<< "\"" << Name << "\", "
<< "\"Select the " << Name << " processor\", ";
if (FeatureList.empty()) {
OS << "0ULL";
OS << "{ }";
} else {
OS << "{ ";
for (unsigned j = 0, M = FeatureList.size(); j < M;) {
OS << Target << "::" << FeatureList[j]->getName();
if (++j < M) OS << " | ";
if (++j < M) OS << ", ";
}
OS << " }";
}
// The "0" is for the "implies" section of this data structure.
OS << ", 0ULL }";
// The { } is for the "implies" section of this data structure.
OS << ", { } }";
// Depending on 'if more in the list' emit comma
if (++i < N) OS << ",";
@@ -1398,7 +1382,7 @@ void SubtargetEmitter::ParseFeaturesFunction(raw_ostream &OS,
}
OS << " InitMCProcessorInfo(CPU, FS);\n"
<< " uint64_t Bits = getFeatureBits();\n";
<< " const FeatureBitset& Bits = getFeatureBits();\n";
for (unsigned i = 0; i < Features.size(); i++) {
// Next record
@@ -1408,12 +1392,12 @@ void SubtargetEmitter::ParseFeaturesFunction(raw_ostream &OS,
const std::string &Attribute = R->getValueAsString("Attribute");
if (Value=="true" || Value=="false")
OS << " if ((Bits & " << Target << "::"
<< Instance << ") != 0) "
OS << " if (Bits[" << Target << "::"
<< Instance << "]) "
<< Attribute << " = " << Value << ";\n";
else
OS << " if ((Bits & " << Target << "::"
<< Instance << ") != 0 && "
OS << " if (Bits[" << Target << "::"
<< Instance << "] && "
<< Attribute << " < " << Value << ") "
<< Attribute << " = " << Value << ";\n";
}
@@ -1431,7 +1415,7 @@ void SubtargetEmitter::run(raw_ostream &OS) {
OS << "#undef GET_SUBTARGETINFO_ENUM\n";
OS << "namespace llvm {\n";
Enumeration(OS, "SubtargetFeature", true);
Enumeration(OS, "SubtargetFeature");
OS << "} // End llvm namespace \n";
OS << "#endif // GET_SUBTARGETINFO_ENUM\n\n";