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Revert "System: Add SwapByteOrder and update Support/MathExtras.h to use it."

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This reverts commit 116234.

It compiled just fine with MSVC and clang...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116242 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael J. Spencer
2010-10-11 21:39:24 +00:00
parent 050d16c2a9
commit af72684eea
4 changed files with 31 additions and 234 deletions
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35
include/llvm/Support/MathExtras.h
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@ -15,7 +15,6 @@
#define LLVM_SUPPORT_MATHEXTRAS_H
#include "llvm/System/DataTypes.h"
#include "llvm/System/SwapByteOrder.h"
namespace llvm {
@ -113,19 +112,47 @@ inline bool isPowerOf2_64(uint64_t Value) {
/// ByteSwap_16 - This function returns a byte-swapped representation of the
/// 16-bit argument, Value.
inline uint16_t ByteSwap_16(uint16_t Value) {
return sys::SwapByteOrder(Value);
#if defined(_MSC_VER) && !defined(_DEBUG)
// The DLL version of the runtime lacks these functions (bug!?), but in a
// release build they're replaced with BSWAP instructions anyway.
return _byteswap_ushort(Value);
#else
uint16_t Hi = Value << 8;
uint16_t Lo = Value >> 8;
return Hi | Lo;
#endif
}
/// ByteSwap_32 - This function returns a byte-swapped representation of the
/// 32-bit argument, Value.
inline uint32_t ByteSwap_32(uint32_t Value) {
return sys::SwapByteOrder(Value);
#if defined(__llvm__) || \
(__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)) && !defined(__ICC)
return __builtin_bswap32(Value);
#elif defined(_MSC_VER) && !defined(_DEBUG)
return _byteswap_ulong(Value);
#else
uint32_t Byte0 = Value & 0x000000FF;
uint32_t Byte1 = Value & 0x0000FF00;
uint32_t Byte2 = Value & 0x00FF0000;
uint32_t Byte3 = Value & 0xFF000000;
return (Byte0 << 24) | (Byte1 << 8) | (Byte2 >> 8) | (Byte3 >> 24);
#endif
}
/// ByteSwap_64 - This function returns a byte-swapped representation of the
/// 64-bit argument, Value.
inline uint64_t ByteSwap_64(uint64_t Value) {
return sys::SwapByteOrder(Value);
#if defined(__llvm__) || \
(__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)) && !defined(__ICC)
return __builtin_bswap64(Value);
#elif defined(_MSC_VER) && !defined(_DEBUG)
return _byteswap_uint64(Value);
#else
uint64_t Hi = ByteSwap_32(uint32_t(Value));
uint32_t Lo = ByteSwap_32(uint32_t(Value >> 32));
return (Hi << 32) | Lo;
#endif
}
/// CountLeadingZeros_32 - this function performs the platform optimal form of