Vikas Arora | 33f74da | 2014-07-25 13:53:32 -0700 | [diff] [blame] | 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 WEBP_UTILS_ENDIAN_INL_H_ |
| 13 | #define WEBP_UTILS_ENDIAN_INL_H_ |
| 14 | |
| 15 | #ifdef HAVE_CONFIG_H |
James Zern | 9e80ee9 | 2015-03-17 18:54:21 -0700 | [diff] [blame] | 16 | #include "../webp/config.h" |
Vikas Arora | 33f74da | 2014-07-25 13:53:32 -0700 | [diff] [blame] | 17 | #endif |
| 18 | |
Vikas Arora | 8c09865 | 2015-01-28 14:08:58 -0800 | [diff] [blame] | 19 | #include "../dsp/dsp.h" |
James Zern | 9e80ee9 | 2015-03-17 18:54:21 -0700 | [diff] [blame] | 20 | #include "../webp/types.h" |
Vikas Arora | 33f74da | 2014-07-25 13:53:32 -0700 | [diff] [blame] | 21 | |
| 22 | // some endian fix (e.g.: mips-gcc doesn't define __BIG_ENDIAN__) |
| 23 | #if !defined(WORDS_BIGENDIAN) && \ |
| 24 | (defined(__BIG_ENDIAN__) || defined(_M_PPC) || \ |
| 25 | (defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__))) |
| 26 | #define WORDS_BIGENDIAN |
| 27 | #endif |
| 28 | |
| 29 | #if defined(WORDS_BIGENDIAN) |
| 30 | #define HToLE32 BSwap32 |
| 31 | #define HToLE16 BSwap16 |
| 32 | #else |
| 33 | #define HToLE32(x) (x) |
| 34 | #define HToLE16(x) (x) |
| 35 | #endif |
| 36 | |
| 37 | #if !defined(HAVE_CONFIG_H) |
Vikas Arora | 33f74da | 2014-07-25 13:53:32 -0700 | [diff] [blame] | 38 | // clang-3.3 and gcc-4.3 have builtin functions for swap32/swap64 |
Vikas Arora | 8c09865 | 2015-01-28 14:08:58 -0800 | [diff] [blame] | 39 | #if LOCAL_GCC_PREREQ(4,3) || LOCAL_CLANG_PREREQ(3,3) |
Vikas Arora | 33f74da | 2014-07-25 13:53:32 -0700 | [diff] [blame] | 40 | #define HAVE_BUILTIN_BSWAP32 |
| 41 | #define HAVE_BUILTIN_BSWAP64 |
| 42 | #endif |
| 43 | // clang-3.3 and gcc-4.8 have a builtin function for swap16 |
Vikas Arora | 8c09865 | 2015-01-28 14:08:58 -0800 | [diff] [blame] | 44 | #if LOCAL_GCC_PREREQ(4,8) || LOCAL_CLANG_PREREQ(3,3) |
Vikas Arora | 33f74da | 2014-07-25 13:53:32 -0700 | [diff] [blame] | 45 | #define HAVE_BUILTIN_BSWAP16 |
| 46 | #endif |
| 47 | #endif // !HAVE_CONFIG_H |
| 48 | |
| 49 | static WEBP_INLINE uint16_t BSwap16(uint16_t x) { |
| 50 | #if defined(HAVE_BUILTIN_BSWAP16) |
| 51 | return __builtin_bswap16(x); |
| 52 | #elif defined(_MSC_VER) |
| 53 | return _byteswap_ushort(x); |
| 54 | #else |
| 55 | // gcc will recognize a 'rorw $8, ...' here: |
| 56 | return (x >> 8) | ((x & 0xff) << 8); |
| 57 | #endif // HAVE_BUILTIN_BSWAP16 |
| 58 | } |
| 59 | |
| 60 | static WEBP_INLINE uint32_t BSwap32(uint32_t x) { |
Vikas Arora | 8c09865 | 2015-01-28 14:08:58 -0800 | [diff] [blame] | 61 | #if defined(WEBP_USE_MIPS32_R2) |
| 62 | uint32_t ret; |
| 63 | __asm__ volatile ( |
| 64 | "wsbh %[ret], %[x] \n\t" |
| 65 | "rotr %[ret], %[ret], 16 \n\t" |
| 66 | : [ret]"=r"(ret) |
| 67 | : [x]"r"(x) |
| 68 | ); |
| 69 | return ret; |
| 70 | #elif defined(HAVE_BUILTIN_BSWAP32) |
Vikas Arora | 33f74da | 2014-07-25 13:53:32 -0700 | [diff] [blame] | 71 | return __builtin_bswap32(x); |
| 72 | #elif defined(__i386__) || defined(__x86_64__) |
| 73 | uint32_t swapped_bytes; |
| 74 | __asm__ volatile("bswap %0" : "=r"(swapped_bytes) : "0"(x)); |
| 75 | return swapped_bytes; |
| 76 | #elif defined(_MSC_VER) |
| 77 | return (uint32_t)_byteswap_ulong(x); |
| 78 | #else |
| 79 | return (x >> 24) | ((x >> 8) & 0xff00) | ((x << 8) & 0xff0000) | (x << 24); |
| 80 | #endif // HAVE_BUILTIN_BSWAP32 |
| 81 | } |
| 82 | |
| 83 | static WEBP_INLINE uint64_t BSwap64(uint64_t x) { |
| 84 | #if defined(HAVE_BUILTIN_BSWAP64) |
| 85 | return __builtin_bswap64(x); |
| 86 | #elif defined(__x86_64__) |
| 87 | uint64_t swapped_bytes; |
| 88 | __asm__ volatile("bswapq %0" : "=r"(swapped_bytes) : "0"(x)); |
| 89 | return swapped_bytes; |
| 90 | #elif defined(_MSC_VER) |
| 91 | return (uint64_t)_byteswap_uint64(x); |
| 92 | #else // generic code for swapping 64-bit values (suggested by bdb@) |
| 93 | x = ((x & 0xffffffff00000000ull) >> 32) | ((x & 0x00000000ffffffffull) << 32); |
| 94 | x = ((x & 0xffff0000ffff0000ull) >> 16) | ((x & 0x0000ffff0000ffffull) << 16); |
| 95 | x = ((x & 0xff00ff00ff00ff00ull) >> 8) | ((x & 0x00ff00ff00ff00ffull) << 8); |
| 96 | return x; |
| 97 | #endif // HAVE_BUILTIN_BSWAP64 |
| 98 | } |
| 99 | |
| 100 | #endif // WEBP_UTILS_ENDIAN_INL_H_ |