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Micro-optimize MCObjectWriter to do a byteswap if necessary and then write the

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whole integer to the stream instead of doing byte-sized writes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111230 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2010-08-17 13:55:45 +00:00
parent 755525ad23
commit 8466efc36f
1 changed files with 29 additions and 24 deletions
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53
include/llvm/MC/MCObjectWriter.h
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@ -10,8 +10,10 @@
#ifndef LLVM_MC_MCOBJECTWRITER_H
#define LLVM_MC_MCOBJECTWRITER_H
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/System/DataTypes.h"
#include "llvm/System/Host.h"
#include <cassert>
namespace llvm {
@ -92,54 +94,57 @@ public:
}
void WriteLE16(uint16_t Value) {
Write8(uint8_t(Value >> 0));
Write8(uint8_t(Value >> 8));
if (sys::isBigEndianHost())
Value = ByteSwap_16(Value);
OS << StringRef((const char*)&Value, sizeof(Value));
}
void WriteLE32(uint32_t Value) {
WriteLE16(uint16_t(Value >> 0));
WriteLE16(uint16_t(Value >> 16));
if (sys::isBigEndianHost())
Value = ByteSwap_32(Value);
OS << StringRef((const char*)&Value, sizeof(Value));
}
void WriteLE64(uint64_t Value) {
WriteLE32(uint32_t(Value >> 0));
WriteLE32(uint32_t(Value >> 32));
if (sys::isBigEndianHost())
Value = ByteSwap_64(Value);
OS << StringRef((const char*)&Value, sizeof(Value));
}
void WriteBE16(uint16_t Value) {
Write8(uint8_t(Value >> 8));
Write8(uint8_t(Value >> 0));
if (sys::isLittleEndianHost())
Value = ByteSwap_16(Value);
OS << StringRef((const char*)&Value, sizeof(Value));
}
void WriteBE32(uint32_t Value) {
WriteBE16(uint16_t(Value >> 16));
WriteBE16(uint16_t(Value >> 0));
if (sys::isLittleEndianHost())
Value = ByteSwap_32(Value);
OS << StringRef((const char*)&Value, sizeof(Value));
}
void WriteBE64(uint64_t Value) {
WriteBE32(uint32_t(Value >> 32));
WriteBE32(uint32_t(Value >> 0));
if (sys::isLittleEndianHost())
Value = ByteSwap_64(Value);
OS << StringRef((const char*)&Value, sizeof(Value));
}
void Write16(uint16_t Value) {
if (IsLittleEndian)
WriteLE16(Value);
else
WriteBE16(Value);
if (IsLittleEndian != sys::isLittleEndianHost())
Value = ByteSwap_16(Value);
OS << StringRef((const char*)&Value, sizeof(Value));
}
void Write32(uint32_t Value) {
if (IsLittleEndian)
WriteLE32(Value);
else
WriteBE32(Value);
if (IsLittleEndian != sys::isLittleEndianHost())
Value = ByteSwap_32(Value);
OS << StringRef((const char*)&Value, sizeof(Value));
}
void Write64(uint64_t Value) {
if (IsLittleEndian)
WriteLE64(Value);
else
WriteBE64(Value);
if (IsLittleEndian != sys::isLittleEndianHost())
Value = ByteSwap_64(Value);
OS << StringRef((const char*)&Value, sizeof(Value));
}
void WriteZeros(unsigned N) {