git.sesse.net Git - vlc/blob - plugins/memcpy/memcpyaltivec.c

   1 /*****************************************************************************
   2  * memcpyaltivec.c : AltiVec memcpy module
   3  *****************************************************************************
   4  * Copyright (C) 2001 VideoLAN
   5  * $Id: memcpyaltivec.c,v 1.6 2002/06/01 12:32:00 sam Exp $
   6  *
   7  * Authors: Christophe Massiot <massiot@via.ecp.fr>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 #ifndef __BUILD_ALTIVEC_ASM__
  25
  26 /*****************************************************************************
  27  * Preamble
  28  *****************************************************************************/
  29 #include <stdlib.h>
  30 #include <string.h>
  31
  32 #include <vlc/vlc.h>
  33
  34 /*****************************************************************************
  35  * Local and extern prototypes.
  36  *****************************************************************************/
  37 static void memcpy_getfunctions( function_list_t * p_function_list );
  38 void *      _M( fast_memcpy )  ( void * to, const void * from, size_t len );
  39
  40 /*****************************************************************************
  41  * Build configuration tree.
  42  *****************************************************************************/
  43 MODULE_CONFIG_START
  44 MODULE_CONFIG_STOP
  45
  46 MODULE_INIT_START
  47     SET_DESCRIPTION( _("AltiVec memcpy module") )
  48     ADD_CAPABILITY( MEMCPY, 100 )
  49     ADD_REQUIREMENT( ALTIVEC )
  50     ADD_SHORTCUT( "altivec" )
  51 MODULE_INIT_STOP
  52
  53 MODULE_ACTIVATE_START
  54     memcpy_getfunctions( &p_module->p_functions->memcpy );
  55 MODULE_ACTIVATE_STOP
  56
  57 MODULE_DEACTIVATE_START
  58 MODULE_DEACTIVATE_STOP
  59
  60 /* Following functions are local */
  61
  62 /*****************************************************************************
  63  * Functions exported as capabilities. They are declared as static so that
  64  * we don't pollute the namespace too much.
  65  *****************************************************************************/
  66 static void memcpy_getfunctions( function_list_t * p_function_list )
  67 {
  68     p_function_list->functions.memcpy.pf_memcpy = _M( fast_memcpy );
  69 }
  70
  71 #else
  72 #   define _M( toto ) toto
  73 typedef unsigned long size_t;
  74 #endif /* __BUILD_ALTIVEC_ASM__ */
  75
  76 #if defined(CAN_COMPILE_C_ALTIVEC) || defined( __BUILD_ALTIVEC_ASM__ )
  77
  78 #define vector_s16_t vector signed short
  79 #define vector_u16_t vector unsigned short
  80 #define vector_s8_t vector signed char
  81 #define vector_u8_t vector unsigned char
  82 #define vector_s32_t vector signed int
  83 #define vector_u32_t vector unsigned int
  84 #define MMREG_SIZE 16
  85
  86 #define SMALL_MEMCPY(to, from, len)                                         \
  87 {                                                                           \
  88     unsigned char * end = to + len;                                         \
  89     while( to < end )                                                       \
  90     {                                                                       \
  91         *to++ = *from++;                                                    \
  92     }                                                                       \
  93 }
  94
  95 void * _M( fast_memcpy )(void * _to, const void * _from, size_t len)
  96 {
  97     void * retval = _to;
  98     unsigned char * to = (unsigned char *)_to;
  99     unsigned char * from = (unsigned char *)_from;
 100
 101     if( len > 16 )
 102     {
 103         /* Align destination to MMREG_SIZE -boundary */
 104         register unsigned long int delta;
 105
 106         delta = ((unsigned long)to)&(MMREG_SIZE-1);
 107         if( delta )
 108         {
 109             delta = MMREG_SIZE - delta;
 110             len -= delta;
 111             SMALL_MEMCPY(to, from, delta);
 112         }
 113
 114         if( len & ~(MMREG_SIZE-1) )
 115         {
 116             vector_u8_t perm, ref0, ref1, tmp;
 117
 118             perm = vec_lvsl( 0, from );
 119             ref0 = vec_ld( 0, from );
 120             ref1 = vec_ld( 15, from );
 121             from += 16;
 122             len -= 16;
 123             tmp = vec_perm( ref0, ref1, perm );
 124             while( len & ~(MMREG_SIZE-1) )
 125             {
 126                 ref0 = vec_ld( 0, from );
 127                 ref1 = vec_ld( 15, from );
 128                 from += 16;
 129                 len -= 16;
 130                 vec_st( tmp, 0, to );
 131                 tmp = vec_perm( ref0, ref1, perm );
 132                 to += 16;
 133             }
 134             vec_st( tmp, 0, to );
 135             to += 16;
 136         }
 137     }
 138
 139     if( len )
 140     {
 141         SMALL_MEMCPY( to, from, len );
 142     }
 143
 144     return retval;
 145 }
 146
 147 #endif
 148
 149 #if !defined(CAN_COMPILE_C_ALTIVEC) && !defined(__BUILD_ALTIVEC_ASM__)
 150
 151 /*
 152  * The asm code is generated with:
 153  *
 154  * gcc-2.95 -fvec -D__BUILD_ALTIVEC_ASM__ -O9 -fomit-frame-pointer -mregnames -S *      memcpyaltivec.c
 155  *
 156  * sed 's/.L/._L/g' memcpyaltivec.s |
 157  * awk '{args=""; len=split ($2, arg, ",");
 158  *      for (i=1; i<=len; i++) { a=arg[i]; if (i<len) a=a",";
 159  *                               args = args sprintf ("%-6s", a) }
 160  *      printf ("\t\"\t%-16s%-24s\\n\"\n", $1, args) }' |
 161  * unexpand -a
 162  */
 163
 164 void * _M( fast_memcpy )(void * _to, const void * _from, size_t len)
 165 {
 166     asm ("                                              \n"
 167         "       cmplwi          %cr0, %r5,  16          \n"
 168         "       mr              %r9,  %r3               \n"
 169         "       bc              4,    1,    ._L3        \n"
 170         "       andi.           %r0,  %r3,  15          \n"
 171         "       bc              12,   2,    ._L4        \n"
 172         "       subfic          %r0,  %r0,  16          \n"
 173         "       add             %r11, %r3,  %r0         \n"
 174         "       cmplw           %cr0, %r3,  %r11        \n"
 175         "       subf            %r5,  %r0,  %r5         \n"
 176         "       bc              4,    0,    ._L4        \n"
 177         "       ._L7:                                   \n"
 178         "       lbz             %r0,  0(%r4)            \n"
 179         "       stb             %r0,  0(%r9)            \n"
 180         "       addi            %r9,  %r9,  1           \n"
 181         "       cmplw           %cr0, %r9,  %r11        \n"
 182         "       addi            %r4,  %r4,  1           \n"
 183         "       bc              12,   0,    ._L7        \n"
 184         "       ._L4:                                   \n"
 185         "       rlwinm.         %r0,  %r5,  0,    0,    27    \n"
 186         "       bc              12,   2,    ._L3        \n"
 187         "       addi            %r5,  %r5,  -16         \n"
 188         "       li              %r11, 15                \n"
 189         "       lvsl            %v12, 0,    %r4         \n"
 190         "       lvx             %v1,  0,    %r4         \n"
 191         "       lvx             %v0,  %r11, %r4         \n"
 192         "       rlwinm.         %r0,  %r5,  0,    0,    27    \n"
 193         "       vperm           %v13, %v1,  %v0,  %v12  \n"
 194         "       addi            %r4,  %r4,  16          \n"
 195         "       bc              12,   2,    ._L11       \n"
 196         "       ._L12:                                  \n"
 197         "       addi            %r5,  %r5,  -16         \n"
 198         "       li              %r11, 15                \n"
 199         "       lvx             %v1,  0,    %r4         \n"
 200         "       lvx             %v0,  %r11, %r4         \n"
 201         "       rlwinm.         %r0,  %r5,  0,    0,    27    \n"
 202         "       stvx            %v13, 0,    %r9         \n"
 203         "       vperm           %v13, %v1,  %v0,  %v12  \n"
 204         "       addi            %r4,  %r4,  16          \n"
 205         "       addi            %r9,  %r9,  16          \n"
 206         "       bc              4,    2,    ._L12       \n"
 207         "       ._L11:                                  \n"
 208         "       stvx            %v13, 0,    %r9         \n"
 209         "       addi            %r9,  %r9,  16          \n"
 210         "       ._L3:                                   \n"
 211         "       cmpwi           %cr0, %r5,  0           \n"
 212         "       bclr            12,   2                 \n"
 213         "       add             %r5,  %r9,  %r5         \n"
 214         "       cmplw           %cr0, %r9,  %r5         \n"
 215         "       bclr            4,    0                 \n"
 216         "       ._L17:                                  \n"
 217         "       lbz             %r0,  0(%r4)            \n"
 218         "       stb             %r0,  0(%r9)            \n"
 219         "       addi            %r9,  %r9,  1           \n"
 220         "       cmplw           %cr0, %r9,  %r5         \n"
 221         "       addi            %r4,  %r4,  1           \n"
 222         "       bc              12,   0,    ._L17       \n"
 223         );
 224 }
 225
 226 #endif