[llvm-commits] [llvm] r151750 - in /llvm/trunk: include/llvm/Bitcode/BitstreamWriter.h lib/Bitcode/Writer/BitcodeWriter.cpp
Daniel Dunbar
daniel at zuster.org
Wed Feb 29 12:31:09 PST 2012
Author: ddunbar
Date: Wed Feb 29 14:31:09 2012
New Revision: 151750
URL: http://llvm.org/viewvc/llvm-project?rev=151750&view=rev
Log:
BitstreamWriter: Change primary output buffer to be a SmallVector instead of an
std::vector.
- Good for 1-2% speedup on writing PCH for Cocoa.h.
- Clang side API match to follow shortly, there wasn't an easy way to make this
non-breaking.
Modified:
llvm/trunk/include/llvm/Bitcode/BitstreamWriter.h
llvm/trunk/lib/Bitcode/Writer/BitcodeWriter.cpp
Modified: llvm/trunk/include/llvm/Bitcode/BitstreamWriter.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Bitcode/BitstreamWriter.h?rev=151750&r1=151749&r2=151750&view=diff
==============================================================================
--- llvm/trunk/include/llvm/Bitcode/BitstreamWriter.h (original)
+++ llvm/trunk/include/llvm/Bitcode/BitstreamWriter.h Wed Feb 29 14:31:09 2012
@@ -16,13 +16,14 @@
#define BITSTREAM_WRITER_H
#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/SmallVector.h"
#include "llvm/Bitcode/BitCodes.h"
#include <vector>
namespace llvm {
class BitstreamWriter {
- std::vector<unsigned char> &Out;
+ SmallVectorImpl<char> &Out;
/// CurBit - Always between 0 and 31 inclusive, specifies the next bit to use.
unsigned CurBit;
@@ -90,7 +91,7 @@
}
public:
- explicit BitstreamWriter(std::vector<unsigned char> &O)
+ explicit BitstreamWriter(SmallVectorImpl<char> &O)
: Out(O), CurBit(0), CurValue(0), CurCodeSize(2) {}
~BitstreamWriter() {
Modified: llvm/trunk/lib/Bitcode/Writer/BitcodeWriter.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Bitcode/Writer/BitcodeWriter.cpp?rev=151750&r1=151749&r2=151750&view=diff
==============================================================================
--- llvm/trunk/lib/Bitcode/Writer/BitcodeWriter.cpp (original)
+++ llvm/trunk/lib/Bitcode/Writer/BitcodeWriter.cpp Wed Feb 29 14:31:09 2012
@@ -1774,8 +1774,7 @@
DarwinBCHeaderSize = 5*4
};
-static void WriteInt32ToBuffer(uint32_t Value,
- std::vector<unsigned char> &Buffer,
+static void WriteInt32ToBuffer(uint32_t Value, SmallVectorImpl<char> &Buffer,
uint32_t &Position) {
Buffer[Position + 0] = (unsigned char) (Value >> 0);
Buffer[Position + 1] = (unsigned char) (Value >> 8);
@@ -1784,7 +1783,7 @@
Position += 4;
}
-static void EmitDarwinBCHeaderAndTrailer(std::vector<unsigned char> &Buffer,
+static void EmitDarwinBCHeaderAndTrailer(SmallVectorImpl<char> &Buffer,
const Triple &TT) {
unsigned CPUType = ~0U;
@@ -1833,7 +1832,7 @@
/// WriteBitcodeToFile - Write the specified module to the specified output
/// stream.
void llvm::WriteBitcodeToFile(const Module *M, raw_ostream &Out) {
- std::vector<unsigned char> Buffer;
+ SmallVector<char, 1024> Buffer;
Buffer.reserve(256*1024);
// If this is darwin or another generic macho target, reserve space for the
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