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emit the __builtin -> intrinsic map with StringMatcher instead of a

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copy of a close relative of it.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113142 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-09-06 03:14:45 +00:00
parent 8e4fdef6cc
commit 298b176559
1 changed files with 18 additions and 108 deletions
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126
utils/TableGen/IntrinsicEmitter.cpp
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@ -14,6 +14,7 @@
#include "CodeGenTarget.h"
#include "IntrinsicEmitter.h"
#include "Record.h"
#include "StringMatcher.h"
#include "llvm/ADT/StringExtras.h"
#include <algorithm>
using namespace llvm;
@ -586,112 +587,22 @@ EmitGCCBuiltinList(const std::vector<CodeGenIntrinsic> &Ints, raw_ostream &OS){
OS << "#endif\n\n";
}
/// EmitBuiltinComparisons - Emit comparisons to determine whether the specified
/// sorted range of builtin names is equal to the current builtin. This breaks
/// it down into a simple tree.
///
/// At this point, we know that all the builtins in the range have the same name
/// for the first 'CharStart' characters. Only the end of the name needs to be
/// discriminated.
typedef std::map<std::string, std::string>::const_iterator StrMapIterator;
static void EmitBuiltinComparisons(StrMapIterator Start, StrMapIterator End,
unsigned CharStart, unsigned Indent,
std::string TargetPrefix, raw_ostream &OS) {
if (Start == End) return; // empty range.
// Determine what, if anything, is the same about all these strings.
std::string CommonString = Start->first;
unsigned NumInRange = 0;
for (StrMapIterator I = Start; I != End; ++I, ++NumInRange) {
// Find the first character that doesn't match.
const std::string &ThisStr = I->first;
unsigned NonMatchChar = CharStart;
while (NonMatchChar < CommonString.size() &&
NonMatchChar < ThisStr.size() &&
CommonString[NonMatchChar] == ThisStr[NonMatchChar])
++NonMatchChar;
// Truncate off pieces that don't match.
CommonString.resize(NonMatchChar);
}
// Just compare the rest of the string.
if (NumInRange == 1) {
if (CharStart != CommonString.size()) {
OS << std::string(Indent*2, ' ') << "if (!memcmp(BuiltinName";
if (CharStart) OS << "+" << CharStart;
OS << ", \"" << (CommonString.c_str()+CharStart) << "\", ";
OS << CommonString.size() - CharStart << "))\n";
++Indent;
}
OS << std::string(Indent*2, ' ') << "IntrinsicID = " << TargetPrefix
<< "Intrinsic::";
OS << Start->second << ";\n";
return;
}
// At this point, we potentially have a common prefix for these builtins, emit
// a check for this common prefix.
if (CommonString.size() != CharStart) {
OS << std::string(Indent*2, ' ') << "if (!memcmp(BuiltinName";
if (CharStart) OS << "+" << CharStart;
OS << ", \"" << (CommonString.c_str()+CharStart) << "\", ";
OS << CommonString.size()-CharStart << ")) {\n";
EmitBuiltinComparisons(Start, End, CommonString.size(), Indent+1,
TargetPrefix, OS);
OS << std::string(Indent*2, ' ') << "}\n";
return;
}
// Output a switch on the character that differs across the set.
OS << std::string(Indent*2, ' ') << "switch (BuiltinName[" << CharStart
<< "]) {";
if (CharStart)
OS << " // \"" << std::string(Start->first.begin(),
Start->first.begin()+CharStart) << "\"";
OS << "\n";
for (StrMapIterator I = Start; I != End; ) {
char ThisChar = I->first[CharStart];
OS << std::string(Indent*2, ' ') << "case '" << ThisChar << "':\n";
// Figure out the range that has this common character.
StrMapIterator NextChar = I;
for (++NextChar; NextChar != End && NextChar->first[CharStart] == ThisChar;
++NextChar)
/*empty*/;
EmitBuiltinComparisons(I, NextChar, CharStart+1, Indent+1, TargetPrefix,OS);
OS << std::string(Indent*2, ' ') << " break;\n";
I = NextChar;
}
OS << std::string(Indent*2, ' ') << "}\n";
}
/// EmitTargetBuiltins - All of the builtins in the specified map are for the
/// same target, and we already checked it.
static void EmitTargetBuiltins(const std::map<std::string, std::string> &BIM,
const std::string &TargetPrefix,
raw_ostream &OS) {
// Rearrange the builtins by length.
std::vector<std::map<std::string, std::string> > BuiltinsByLen;
BuiltinsByLen.reserve(100);
for (StrMapIterator I = BIM.begin(), E = BIM.end(); I != E; ++I) {
if (I->first.size() >= BuiltinsByLen.size())
BuiltinsByLen.resize(I->first.size()+1);
BuiltinsByLen[I->first.size()].insert(*I);
}
std::vector<StringMatcher::StringPair> Results;
// Now that we have all the builtins by their length, emit a switch stmt.
OS << " switch (strlen(BuiltinName)) {\n";
OS << " default: break;\n";
for (unsigned i = 0, e = BuiltinsByLen.size(); i != e; ++i) {
if (BuiltinsByLen[i].empty()) continue;
OS << " case " << i << ":\n";
EmitBuiltinComparisons(BuiltinsByLen[i].begin(), BuiltinsByLen[i].end(),
0, 3, TargetPrefix, OS);
OS << " break;\n";
for (std::map<std::string, std::string>::const_iterator I = BIM.begin(),
E = BIM.end(); I != E; ++I) {
std::string ResultCode =
"return " + TargetPrefix + "Intrinsic::" + I->second + ";";
Results.push_back(StringMatcher::StringPair(I->first, ResultCode));
}
OS << " }\n";
StringMatcher("BuiltinName", Results, OS).Emit();
}
@ -721,24 +632,20 @@ EmitIntrinsicToGCCBuiltinMap(const std::vector<CodeGenIntrinsic> &Ints,
if (TargetOnly) {
OS << "static " << TargetPrefix << "Intrinsic::ID "
<< "getIntrinsicForGCCBuiltin(const char "
<< "*TargetPrefix, const char *BuiltinName) {\n";
OS << " " << TargetPrefix << "Intrinsic::ID IntrinsicID = ";
<< "*TargetPrefixStr, const char *BuiltinNameStr) {\n";
} else {
OS << "Intrinsic::ID Intrinsic::getIntrinsicForGCCBuiltin(const char "
<< "*TargetPrefix, const char *BuiltinName) {\n";
OS << " Intrinsic::ID IntrinsicID = ";
<< "*TargetPrefixStr, const char *BuiltinNameStr) {\n";
}
if (TargetOnly)
OS << "(" << TargetPrefix<< "Intrinsic::ID)";
OS << "Intrinsic::not_intrinsic;\n";
OS << " StringRef BuiltinName(BuiltinNameStr);\n";
OS << " StringRef TargetPrefix(TargetPrefixStr);\n\n";
// Note: this could emit significantly better code if we cared.
for (BIMTy::iterator I = BuiltinMap.begin(), E = BuiltinMap.end();I != E;++I){
OS << " ";
if (!I->first.empty())
OS << "if (!strcmp(TargetPrefix, \"" << I->first << "\")) ";
OS << "if (TargetPrefix == \"" << I->first << "\") ";
else
OS << "/* Target Independent Builtins */ ";
OS << "{\n";
@ -747,7 +654,10 @@ EmitIntrinsicToGCCBuiltinMap(const std::vector<CodeGenIntrinsic> &Ints,
EmitTargetBuiltins(I->second, TargetPrefix, OS);
OS << " }\n";
}
OS << " return IntrinsicID;\n";
OS << " return ";
if (!TargetPrefix.empty())
OS << "(" << TargetPrefix << "Intrinsic::ID)";
OS << "Intrinsic::not_intrinsic;\n";
OS << "}\n";
OS << "#endif\n\n";
}