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.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151750 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Bitcode/Writer/BitcodeWriter.cpp b/lib/Bitcode/Writer/BitcodeWriter.cpp
index c6c7fb7..9376990 100644
--- a/lib/Bitcode/Writer/BitcodeWriter.cpp
+++ b/lib/Bitcode/Writer/BitcodeWriter.cpp
@@ -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