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1 /*
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2 * This file is part of FFmpeg.
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3 *
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4 * FFmpeg is free software; you can redistribute it and/or
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5 * modify it under the terms of the GNU Lesser General Public
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6 * License as published by the Free Software Foundation; either
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7 * version 2.1 of the License, or (at your option) any later version.
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8 *
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9 * FFmpeg is distributed in the hope that it will be useful,
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10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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12 * Lesser General Public License for more details.
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13 *
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14 * You should have received a copy of the GNU Lesser General Public
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15 * License along with FFmpeg; if not, write to the Free Software
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16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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17 */
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18
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19 #ifndef AVUTIL_ARM_INTREADWRITE_H
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20 #define AVUTIL_ARM_INTREADWRITE_H
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21
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22 #include <stdint.h>
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23 #include "config.h"
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24
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25 #if HAVE_FAST_UNALIGNED && HAVE_INLINE_ASM
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26
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27 #define AV_RN16 AV_RN16
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28 static av_always_inline uint16_t AV_RN16(const void *p)
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29 {
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30 uint16_t v;
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31 __asm__ ("ldrh %0, %1" : "=r"(v) : "m"(*(const uint16_t *)p));
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32 return v;
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33 }
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34
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35 #define AV_WN16 AV_WN16
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36 static av_always_inline void AV_WN16(void *p, uint16_t v)
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37 {
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38 __asm__ ("strh %1, %0" : "=m"(*(uint16_t *)p) : "r"(v));
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39 }
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40
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41 #define AV_RN32 AV_RN32
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42 static av_always_inline uint32_t AV_RN32(const void *p)
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43 {
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44 uint32_t v;
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45 __asm__ ("ldr %0, %1" : "=r"(v) : "m"(*(const uint32_t *)p));
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46 return v;
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47 }
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48
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49 #define AV_WN32 AV_WN32
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50 static av_always_inline void AV_WN32(void *p, uint32_t v)
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51 {
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52 __asm__ ("str %1, %0" : "=m"(*(uint32_t *)p) : "r"(v));
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53 }
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54
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55 #define AV_RN64 AV_RN64
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56 static av_always_inline uint64_t AV_RN64(const void *p)
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57 {
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58 union { uint64_t v; uint32_t hl[2]; } v;
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59 __asm__ ("ldr %0, %2 \n\t"
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60 "ldr %1, %3 \n\t"
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61 : "=&r"(v.hl[0]), "=r"(v.hl[1])
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62 : "m"(*(const uint32_t*)p), "m"(*((const uint32_t*)p+1)));
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63 return v.v;
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64 }
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65
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66 #define AV_WN64 AV_WN64
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67 static av_always_inline void AV_WN64(void *p, uint64_t v)
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68 {
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69 union { uint64_t v; uint32_t hl[2]; } vv = { v };
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70 __asm__ ("str %2, %0 \n\t"
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71 "str %3, %1 \n\t"
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72 : "=m"(*(uint32_t*)p), "=m"(*((uint32_t*)p+1))
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73 : "r"(vv.hl[0]), "r"(vv.hl[1]));
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74 }
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75
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76 #endif /* HAVE_INLINE_ASM */
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77
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78 #endif /* AVUTIL_ARM_INTREADWRITE_H */
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