1 // Copyright 2014 Google Inc. All Rights Reserved. 2 // 3 // Use of this source code is governed by a BSD-style license 4 // that can be found in the COPYING file in the root of the source 5 // tree. An additional intellectual property rights grant can be found 6 // in the file PATENTS. All contributing project authors may 7 // be found in the AUTHORS file in the root of the source tree. 8 // ----------------------------------------------------------------------------- 9 // 10 // Endian related functions. 11 12 #ifndef VPX_UTIL_ENDIAN_INL_H_ 13 #define VPX_UTIL_ENDIAN_INL_H_ 14 15 #include <stdlib.h> 16 #include "./vpx_config.h" 17 #include "vpx/vpx_integer.h" 18 19 #if defined(__GNUC__) 20 #define LOCAL_GCC_VERSION ((__GNUC__ << 8) | __GNUC_MINOR__) 21 #define LOCAL_GCC_PREREQ(maj, min) (LOCAL_GCC_VERSION >= (((maj) << 8) | (min))) 22 #else 23 #define LOCAL_GCC_VERSION 0 24 #define LOCAL_GCC_PREREQ(maj, min) 0 25 #endif 26 27 // handle clang compatibility 28 #ifndef __has_builtin 29 #define __has_builtin(x) 0 30 #endif 31 32 // some endian fix (e.g.: mips-gcc doesn't define __BIG_ENDIAN__) 33 #if !defined(WORDS_BIGENDIAN) && \ 34 (defined(__BIG_ENDIAN__) || defined(_M_PPC) || \ 35 (defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__))) 36 #define WORDS_BIGENDIAN 37 #endif 38 39 #if defined(WORDS_BIGENDIAN) 40 #define HToLE32 BSwap32 41 #define HToLE16 BSwap16 42 #define HToBE64(x) (x) 43 #define HToBE32(x) (x) 44 #else 45 #define HToLE32(x) (x) 46 #define HToLE16(x) (x) 47 #define HToBE64(X) BSwap64(X) 48 #define HToBE32(X) BSwap32(X) 49 #endif 50 51 #if LOCAL_GCC_PREREQ(4, 8) || __has_builtin(__builtin_bswap16) 52 #define HAVE_BUILTIN_BSWAP16 53 #endif 54 55 #if LOCAL_GCC_PREREQ(4, 3) || __has_builtin(__builtin_bswap32) 56 #define HAVE_BUILTIN_BSWAP32 57 #endif 58 59 #if LOCAL_GCC_PREREQ(4, 3) || __has_builtin(__builtin_bswap64) 60 #define HAVE_BUILTIN_BSWAP64 61 #endif 62 63 #if HAVE_MIPS32 && defined(__mips__) && !defined(__mips64) && \ 64 defined(__mips_isa_rev) && (__mips_isa_rev >= 2) && (__mips_isa_rev < 6) 65 #define VPX_USE_MIPS32_R2 66 #endif 67 68 static INLINE uint16_t BSwap16(uint16_t x) { 69 #if defined(HAVE_BUILTIN_BSWAP16) 70 return __builtin_bswap16(x); 71 #elif defined(_MSC_VER) 72 return _byteswap_ushort(x); 73 #else 74 // gcc will recognize a 'rorw $8, ...' here: 75 return (x >> 8) | ((x & 0xff) << 8); 76 #endif // HAVE_BUILTIN_BSWAP16 77 } 78 79 static INLINE uint32_t BSwap32(uint32_t x) { 80 #if defined(VPX_USE_MIPS32_R2) 81 uint32_t ret; 82 __asm__ volatile( 83 "wsbh %[ret], %[x] \n\t" 84 "rotr %[ret], %[ret], 16 \n\t" 85 : [ret] "=r"(ret) 86 : [x] "r"(x)); 87 return ret; 88 #elif defined(HAVE_BUILTIN_BSWAP32) 89 return __builtin_bswap32(x); 90 #elif defined(__i386__) || defined(__x86_64__) 91 uint32_t swapped_bytes; 92 __asm__ volatile("bswap %0" : "=r"(swapped_bytes) : "0"(x)); 93 return swapped_bytes; 94 #elif defined(_MSC_VER) 95 return (uint32_t)_byteswap_ulong(x); 96 #else 97 return (x >> 24) | ((x >> 8) & 0xff00) | ((x << 8) & 0xff0000) | (x << 24); 98 #endif // HAVE_BUILTIN_BSWAP32 99 } 100 101 static INLINE uint64_t BSwap64(uint64_t x) { 102 #if defined(HAVE_BUILTIN_BSWAP64) 103 return __builtin_bswap64(x); 104 #elif defined(__x86_64__) 105 uint64_t swapped_bytes; 106 __asm__ volatile("bswapq %0" : "=r"(swapped_bytes) : "0"(x)); 107 return swapped_bytes; 108 #elif defined(_MSC_VER) 109 return (uint64_t)_byteswap_uint64(x); 110 #else // generic code for swapping 64-bit values (suggested by bdb@) 111 x = ((x & 0xffffffff00000000ull) >> 32) | ((x & 0x00000000ffffffffull) << 32); 112 x = ((x & 0xffff0000ffff0000ull) >> 16) | ((x & 0x0000ffff0000ffffull) << 16); 113 x = ((x & 0xff00ff00ff00ff00ull) >> 8) | ((x & 0x00ff00ff00ff00ffull) << 8); 114 return x; 115 #endif // HAVE_BUILTIN_BSWAP64 116 } 117 118 #endif // VPX_UTIL_ENDIAN_INL_H_ 119
