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Make BytecodeWriter::outputValueSymbolTable *significantly* less abusive

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of memory, through a combination of DenseMap and SmallVector.  This speeds
up bcwriter on 447.dealII from 1.31s to 0.82s (60% faster).

llvm-svn: 34141
This commit is contained in:
Chris Lattner 2007-02-10 07:31:44 +00:00
parent c2542fe089
commit 6301eb8919
1 changed files with 4 additions and 3 deletions
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7
lib/Bytecode/Writer/Writer.cpp
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@ -33,6 +33,7 @@
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/Streams.h"
#include "llvm/System/Program.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/Statistic.h"
#include <cstring>
@ -1087,15 +1088,15 @@ void BytecodeWriter::outputValueSymbolTable(const ValueSymbolTable &VST) {
// Organize the symbol table by type
typedef std::pair<const std::string*, const Value*> PlaneMapEntry;
typedef std::vector<PlaneMapEntry> PlaneMapVector;
typedef std::map<const Type*, PlaneMapVector > PlaneMap;
typedef SmallVector<PlaneMapEntry, 8> PlaneMapVector;
typedef DenseMap<const Type*, PlaneMapVector > PlaneMap;
PlaneMap Planes;
for (ValueSymbolTable::const_iterator SI = VST.begin(), SE = VST.end();
SI != SE; ++SI)
Planes[SI->second->getType()]
.push_back(std::make_pair(&SI->first, SI->second));
for (PlaneMap::const_iterator PI = Planes.begin(), PE = Planes.end();
for (PlaneMap::iterator PI = Planes.begin(), PE = Planes.end();
PI != PE; ++PI) {
PlaneMapVector::const_iterator I = PI->second.begin();
PlaneMapVector::const_iterator End = PI->second.end();