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libavutil/arm/bswap.h

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00001 /*
00002  * This file is part of FFmpeg.
00003  *
00004  * FFmpeg is free software; you can redistribute it and/or
00005  * modify it under the terms of the GNU Lesser General Public
00006  * License as published by the Free Software Foundation; either
00007  * version 2.1 of the License, or (at your option) any later version.
00008  *
00009  * FFmpeg is distributed in the hope that it will be useful,
00010  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00011  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012  * Lesser General Public License for more details.
00013  *
00014  * You should have received a copy of the GNU Lesser General Public
00015  * License along with FFmpeg; if not, write to the Free Software
00016  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00017  */
00018 
00019 #ifndef AVUTIL_ARM_BSWAP_H
00020 #define AVUTIL_ARM_BSWAP_H
00021 
00022 #include <stdint.h>
00023 #include "config.h"
00024 #include "libavutil/attributes.h"
00025 
00026 #ifdef __ARMCC_VERSION
00027 
00028 #if HAVE_ARMV6
00029 #define bswap_16 bswap_16
00030 static av_always_inline av_const unsigned bswap_16(unsigned x)
00031 {
00032     __asm { rev16 x, x }
00033     return x;
00034 }
00035 
00036 #define bswap_32 bswap_32
00037 static av_always_inline av_const uint32_t bswap_32(uint32_t x)
00038 {
00039     return __rev(x);
00040 }
00041 #endif /* HAVE_ARMV6 */
00042 
00043 #elif HAVE_INLINE_ASM
00044 
00045 #if HAVE_ARMV6
00046 #define bswap_16 bswap_16
00047 static av_always_inline av_const unsigned bswap_16(unsigned x)
00048 {
00049     __asm__("rev16 %0, %0" : "+r"(x));
00050     return x;
00051 }
00052 #endif
00053 
00054 #define bswap_32 bswap_32
00055 static av_always_inline av_const uint32_t bswap_32(uint32_t x)
00056 {
00057 #if HAVE_ARMV6
00058     __asm__("rev %0, %0" : "+r"(x));
00059 #else
00060     uint32_t t;
00061     __asm__ ("eor %1, %0, %0, ror #16 \n\t"
00062              "bic %1, %1, #0xFF0000   \n\t"
00063              "mov %0, %0, ror #8      \n\t"
00064              "eor %0, %0, %1, lsr #8  \n\t"
00065              : "+r"(x), "=&r"(t));
00066 #endif /* HAVE_ARMV6 */
00067     return x;
00068 }
00069 
00070 #endif /* __ARMCC_VERSION */
00071 
00072 #endif /* AVUTIL_ARM_BSWAP_H */

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