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libavutil/avr32/intreadwrite.h

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00001 /*
00002  * Copyright (c) 2009 Mans Rullgard <mans@mansr.com>
00003  *
00004  * This file is part of FFmpeg.
00005  *
00006  * FFmpeg is free software; you can redistribute it and/or
00007  * modify it under the terms of the GNU Lesser General Public
00008  * License as published by the Free Software Foundation; either
00009  * version 2.1 of the License, or (at your option) any later version.
00010  *
00011  * FFmpeg is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  * Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public
00017  * License along with FFmpeg; if not, write to the Free Software
00018  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00019  */
00020 
00021 #ifndef AVUTIL_AVR32_INTREADWRITE_H
00022 #define AVUTIL_AVR32_INTREADWRITE_H
00023 
00024 #include <stdint.h>
00025 #include "config.h"
00026 #include "libavutil/bswap.h"
00027 
00028 /*
00029  * AVR32 does not support unaligned memory accesses, except for the AP
00030  * series which suppports unaligned 32-bit loads and stores.  16-bit
00031  * and 64-bit accesses must be aligned to 16 and 32 bits, respectively.
00032  * This means we cannot use the byte-swapping load/store instructions
00033  * here.
00034  *
00035  * For 16-bit, 24-bit, and (on UC series) 32-bit loads, we instead use
00036  * the LDINS.B instruction, which gcc fails to utilise with the
00037  * generic code.  GCC also fails to use plain LD.W and ST.W even for
00038  * AP processors, so we override the generic code.  The 64-bit
00039  * versions are improved by using our optimised 32-bit functions.
00040  */
00041 
00042 #define AV_RL16 AV_RL16
00043 static av_always_inline uint16_t AV_RL16(const void *p)
00044 {
00045     uint16_t v;
00046     __asm__ ("ld.ub    %0,   %1  \n\t"
00047              "ldins.b  %0:l, %2  \n\t"
00048              : "=&r"(v)
00049              : "m"(*(const uint8_t*)p), "RKs12"(*((const uint8_t*)p+1)));
00050     return v;
00051 }
00052 
00053 #define AV_RB16 AV_RB16
00054 static av_always_inline uint16_t AV_RB16(const void *p)
00055 {
00056     uint16_t v;
00057     __asm__ ("ld.ub    %0,   %2  \n\t"
00058              "ldins.b  %0:l, %1  \n\t"
00059              : "=&r"(v)
00060              : "RKs12"(*(const uint8_t*)p), "m"(*((const uint8_t*)p+1)));
00061     return v;
00062 }
00063 
00064 #define AV_RB24 AV_RB24
00065 static av_always_inline uint32_t AV_RB24(const void *p)
00066 {
00067     uint32_t v;
00068     __asm__ ("ld.ub    %0,   %3  \n\t"
00069              "ldins.b  %0:l, %2  \n\t"
00070              "ldins.b  %0:u, %1  \n\t"
00071              : "=&r"(v)
00072              : "RKs12"(* (const uint8_t*)p),
00073                "RKs12"(*((const uint8_t*)p+1)),
00074                "m"    (*((const uint8_t*)p+2)));
00075     return v;
00076 }
00077 
00078 #define AV_RL24 AV_RL24
00079 static av_always_inline uint32_t AV_RL24(const void *p)
00080 {
00081     uint32_t v;
00082     __asm__ ("ld.ub    %0,   %1  \n\t"
00083              "ldins.b  %0:l, %2  \n\t"
00084              "ldins.b  %0:u, %3  \n\t"
00085              : "=&r"(v)
00086              : "m"    (* (const uint8_t*)p),
00087                "RKs12"(*((const uint8_t*)p+1)),
00088                "RKs12"(*((const uint8_t*)p+2)));
00089     return v;
00090 }
00091 
00092 #if ARCH_AVR32_AP
00093 
00094 #define AV_RB32 AV_RB32
00095 static av_always_inline uint32_t AV_RB32(const void *p)
00096 {
00097     uint32_t v;
00098     __asm__ ("ld.w %0, %1" : "=r"(v) : "m"(*(const uint32_t*)p));
00099     return v;
00100 }
00101 
00102 #define AV_WB32 AV_WB32
00103 static av_always_inline void AV_WB32(void *p, uint32_t v)
00104 {
00105     __asm__ ("st.w %0, %1" : "=m"(*(uint32_t*)p) : "r"(v));
00106 }
00107 
00108 /* These two would be defined by generic code, but we need them sooner. */
00109 #define AV_RL32(p)    bswap_32(AV_RB32(p))
00110 #define AV_WL32(p, v) AV_WB32(p, bswap_32(v))
00111 
00112 #define AV_WB64 AV_WB64
00113 static av_always_inline void AV_WB64(void *p, uint64_t v)
00114 {
00115     union { uint64_t v; uint32_t hl[2]; } vv = { v };
00116     AV_WB32(p, vv.hl[0]);
00117     AV_WB32((uint32_t*)p+1, vv.hl[1]);
00118 }
00119 
00120 #define AV_WL64 AV_WL64
00121 static av_always_inline void AV_WL64(void *p, uint64_t v)
00122 {
00123     union { uint64_t v; uint32_t hl[2]; } vv = { v };
00124     AV_WL32(p, vv.hl[1]);
00125     AV_WL32((uint32_t*)p+1, vv.hl[0]);
00126 }
00127 
00128 #else /* ARCH_AVR32_AP */
00129 
00130 #define AV_RB32 AV_RB32
00131 static av_always_inline uint32_t AV_RB32(const void *p)
00132 {
00133     uint32_t v;
00134     __asm__ ("ld.ub    %0,   %4  \n\t"
00135              "ldins.b  %0:l, %3  \n\t"
00136              "ldins.b  %0:u, %2  \n\t"
00137              "ldins.b  %0:t, %1  \n\t"
00138              : "=&r"(v)
00139              : "RKs12"(* (const uint8_t*)p),
00140                "RKs12"(*((const uint8_t*)p+1)),
00141                "RKs12"(*((const uint8_t*)p+2)),
00142                "m"    (*((const uint8_t*)p+3)));
00143     return v;
00144 }
00145 
00146 #define AV_RL32 AV_RL32
00147 static av_always_inline uint32_t AV_RL32(const void *p)
00148 {
00149     uint32_t v;
00150     __asm__ ("ld.ub    %0,   %1  \n\t"
00151              "ldins.b  %0:l, %2  \n\t"
00152              "ldins.b  %0:u, %3  \n\t"
00153              "ldins.b  %0:t, %4  \n\t"
00154              : "=&r"(v)
00155              : "m"    (* (const uint8_t*)p),
00156                "RKs12"(*((const uint8_t*)p+1)),
00157                "RKs12"(*((const uint8_t*)p+2)),
00158                "RKs12"(*((const uint8_t*)p+3)));
00159     return v;
00160 }
00161 
00162 #endif /* ARCH_AVR32_AP */
00163 
00164 #define AV_RB64 AV_RB64
00165 static av_always_inline uint64_t AV_RB64(const void *p)
00166 {
00167     union { uint64_t v; uint32_t hl[2]; } v;
00168     v.hl[0] = AV_RB32(p);
00169     v.hl[1] = AV_RB32((const uint32_t*)p+1);
00170     return v.v;
00171 }
00172 
00173 #define AV_RL64 AV_RL64
00174 static av_always_inline uint64_t AV_RL64(const void *p)
00175 {
00176     union { uint64_t v; uint32_t hl[2]; } v;
00177     v.hl[1] = AV_RL32(p);
00178     v.hl[0] = AV_RL32((const uint32_t*)p+1);
00179     return v.v;
00180 }
00181 
00182 #endif /* AVUTIL_AVR32_INTREADWRITE_H */

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