forked from Mirrors/freeswitch
119 lines
3.5 KiB
C
119 lines
3.5 KiB
C
// Copyright 2014 Google Inc. All Rights Reserved.
|
|
//
|
|
// Use of this source code is governed by a BSD-style license
|
|
// that can be found in the COPYING file in the root of the source
|
|
// tree. An additional intellectual property rights grant can be found
|
|
// in the file PATENTS. All contributing project authors may
|
|
// be found in the AUTHORS file in the root of the source tree.
|
|
// -----------------------------------------------------------------------------
|
|
//
|
|
// Endian related functions.
|
|
|
|
#ifndef VPX_VPX_UTIL_ENDIAN_INL_H_
|
|
#define VPX_VPX_UTIL_ENDIAN_INL_H_
|
|
|
|
#include <stdlib.h>
|
|
#include "./vpx_config.h"
|
|
#include "vpx/vpx_integer.h"
|
|
|
|
#if defined(__GNUC__)
|
|
#define LOCAL_GCC_VERSION ((__GNUC__ << 8) | __GNUC_MINOR__)
|
|
#define LOCAL_GCC_PREREQ(maj, min) (LOCAL_GCC_VERSION >= (((maj) << 8) | (min)))
|
|
#else
|
|
#define LOCAL_GCC_VERSION 0
|
|
#define LOCAL_GCC_PREREQ(maj, min) 0
|
|
#endif
|
|
|
|
// handle clang compatibility
|
|
#ifndef __has_builtin
|
|
#define __has_builtin(x) 0
|
|
#endif
|
|
|
|
// some endian fix (e.g.: mips-gcc doesn't define __BIG_ENDIAN__)
|
|
#if !defined(WORDS_BIGENDIAN) && \
|
|
(defined(__BIG_ENDIAN__) || defined(_M_PPC) || \
|
|
(defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)))
|
|
#define WORDS_BIGENDIAN
|
|
#endif
|
|
|
|
#if defined(WORDS_BIGENDIAN)
|
|
#define HToLE32 BSwap32
|
|
#define HToLE16 BSwap16
|
|
#define HToBE64(x) (x)
|
|
#define HToBE32(x) (x)
|
|
#else
|
|
#define HToLE32(x) (x)
|
|
#define HToLE16(x) (x)
|
|
#define HToBE64(X) BSwap64(X)
|
|
#define HToBE32(X) BSwap32(X)
|
|
#endif
|
|
|
|
#if LOCAL_GCC_PREREQ(4, 8) || __has_builtin(__builtin_bswap16)
|
|
#define HAVE_BUILTIN_BSWAP16
|
|
#endif
|
|
|
|
#if LOCAL_GCC_PREREQ(4, 3) || __has_builtin(__builtin_bswap32)
|
|
#define HAVE_BUILTIN_BSWAP32
|
|
#endif
|
|
|
|
#if LOCAL_GCC_PREREQ(4, 3) || __has_builtin(__builtin_bswap64)
|
|
#define HAVE_BUILTIN_BSWAP64
|
|
#endif
|
|
|
|
#if HAVE_MIPS32 && defined(__mips__) && !defined(__mips64) && \
|
|
defined(__mips_isa_rev) && (__mips_isa_rev >= 2) && (__mips_isa_rev < 6)
|
|
#define VPX_USE_MIPS32_R2
|
|
#endif
|
|
|
|
static INLINE uint16_t BSwap16(uint16_t x) {
|
|
#if defined(HAVE_BUILTIN_BSWAP16)
|
|
return __builtin_bswap16(x);
|
|
#elif defined(_MSC_VER)
|
|
return _byteswap_ushort(x);
|
|
#else
|
|
// gcc will recognize a 'rorw $8, ...' here:
|
|
return (x >> 8) | ((x & 0xff) << 8);
|
|
#endif // HAVE_BUILTIN_BSWAP16
|
|
}
|
|
|
|
static INLINE uint32_t BSwap32(uint32_t x) {
|
|
#if defined(VPX_USE_MIPS32_R2)
|
|
uint32_t ret;
|
|
__asm__ volatile(
|
|
"wsbh %[ret], %[x] \n\t"
|
|
"rotr %[ret], %[ret], 16 \n\t"
|
|
: [ret] "=r"(ret)
|
|
: [x] "r"(x));
|
|
return ret;
|
|
#elif defined(HAVE_BUILTIN_BSWAP32)
|
|
return __builtin_bswap32(x);
|
|
#elif defined(__i386__) || defined(__x86_64__)
|
|
uint32_t swapped_bytes;
|
|
__asm__ volatile("bswap %0" : "=r"(swapped_bytes) : "0"(x));
|
|
return swapped_bytes;
|
|
#elif defined(_MSC_VER)
|
|
return (uint32_t)_byteswap_ulong(x);
|
|
#else
|
|
return (x >> 24) | ((x >> 8) & 0xff00) | ((x << 8) & 0xff0000) | (x << 24);
|
|
#endif // HAVE_BUILTIN_BSWAP32
|
|
}
|
|
|
|
static INLINE uint64_t BSwap64(uint64_t x) {
|
|
#if defined(HAVE_BUILTIN_BSWAP64)
|
|
return __builtin_bswap64(x);
|
|
#elif defined(__x86_64__)
|
|
uint64_t swapped_bytes;
|
|
__asm__ volatile("bswapq %0" : "=r"(swapped_bytes) : "0"(x));
|
|
return swapped_bytes;
|
|
#elif defined(_MSC_VER)
|
|
return (uint64_t)_byteswap_uint64(x);
|
|
#else // generic code for swapping 64-bit values (suggested by bdb@)
|
|
x = ((x & 0xffffffff00000000ull) >> 32) | ((x & 0x00000000ffffffffull) << 32);
|
|
x = ((x & 0xffff0000ffff0000ull) >> 16) | ((x & 0x0000ffff0000ffffull) << 16);
|
|
x = ((x & 0xff00ff00ff00ff00ull) >> 8) | ((x & 0x00ff00ff00ff00ffull) << 8);
|
|
return x;
|
|
#endif // HAVE_BUILTIN_BSWAP64
|
|
}
|
|
|
|
#endif // VPX_VPX_UTIL_ENDIAN_INL_H_
|