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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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101
include/llvm/System/SwapByteOrder.h
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@@ -1,101 +0,0 @@
//===- SwapByteOrder.h - Generic and optimized byte swaps -------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares generic and optimized functions to swap the byte order of
// an integral type.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SYSTEM_SWAP_BYTE_ORDER_H
#define LLVM_SYSTEM_SWAP_BYTE_ORDER_H
#include "llvm/Support/type_traits.h"
#include "llvm/System/DataTypes.h"
#include <cstddef>
#include <limits>
namespace llvm {
namespace sys {
template<typename value_type>
inline
typename enable_if_c<sizeof(value_type) == 1
&& std::numeric_limits<value_type>::is_integer,
value_type>::type
SwapByteOrder(value_type Value) {
// No swapping needed.
return Value;
}
template<typename value_type>
inline
typename enable_if_c<sizeof(value_type) == 2
&& std::numeric_limits<value_type>::is_integer,
value_type>::type
SwapByteOrder(value_type Value) {
// Cast signed types to unsigned before swapping.
uint16_t value = static_cast<uint16_t>(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 value_type(Hi | Lo);
#endif
}
template<typename value_type>
inline
typename enable_if_c<sizeof(value_type) == 4
&& std::numeric_limits<value_type>::is_integer,
value_type>::type
SwapByteOrder(value_type Value) {
// Cast signed types to unsigned before swapping.
uint32_t value = static_cast<uint32_t>(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 typename value_type(
(Byte0 << 24) | (Byte1 << 8) | (Byte2 >> 8) | (Byte3 >> 24));
#endif
}
template<typename value_type>
inline
typename enable_if_c<sizeof(value_type) == 8
&& std::numeric_limits<value_type>::is_integer,
value_type>::type
SwapByteOrder(value_type Value) {
// Cast signed types to unsigned before swapping.
uint64_t value = static_cast<uint64_t>(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 = SwapByteOrder<uint32_t>(uint32_t(value));
uint32_t Lo = SwapByteOrder<uint32_t>(uint32_t(value >> 32));
return value_type((Hi << 32) | Lo);
#endif
}
} // end namespace sys
} // end namespace llvm
#endif