ffmpeg/libavcodec/x86/inline_asm.h

   1 /*
   2  * inline assembly helper macros
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #ifndef AVCODEC_X86_INLINE_ASM_H
  22 #define AVCODEC_X86_INLINE_ASM_H
  23
  24 #include "constants.h"
  25
  26 #define MOVQ_WONE(regd) \
  27     __asm__ volatile ( \
  28     "pcmpeqd %%" #regd ", %%" #regd " \n\t" \
  29     "psrlw $15, %%" #regd ::)
  30
  31 #define JUMPALIGN()     __asm__ volatile (".p2align 3"::)
  32 #define MOVQ_ZERO(regd) __asm__ volatile ("pxor %%"#regd", %%"#regd ::)
  33
  34 #define MOVQ_BFE(regd)                                  \
  35     __asm__ volatile (                                  \
  36         "pcmpeqd %%"#regd", %%"#regd"   \n\t"           \
  37         "paddb   %%"#regd", %%"#regd"   \n\t" ::)
  38
  39 #ifndef PIC
  40 #define MOVQ_WTWO(regd) __asm__ volatile ("movq %0, %%"#regd" \n\t" :: "m"(ff_pw_2))
  41 #else
  42 // for shared library it's better to use this way for accessing constants
  43 // pcmpeqd -> -1
  44 #define MOVQ_WTWO(regd)                                 \
  45     __asm__ volatile (                                  \
  46         "pcmpeqd %%"#regd", %%"#regd"   \n\t"           \
  47         "psrlw         $15, %%"#regd"   \n\t"           \
  48         "psllw          $1, %%"#regd"   \n\t"::)
  49
  50 #endif
  51
  52 // using regr as temporary and for the output result
  53 // first argument is unmodifed and second is trashed
  54 // regfe is supposed to contain 0xfefefefefefefefe
  55 #define PAVGB_MMX_NO_RND(rega, regb, regr, regfe)                \
  56     "movq   "#rega", "#regr"            \n\t"                    \
  57     "pand   "#regb", "#regr"            \n\t"                    \
  58     "pxor   "#rega", "#regb"            \n\t"                    \
  59     "pand  "#regfe", "#regb"            \n\t"                    \
  60     "psrlq       $1, "#regb"            \n\t"                    \
  61     "paddb  "#regb", "#regr"            \n\t"
  62
  63 #define PAVGB_MMX(rega, regb, regr, regfe)                       \
  64     "movq   "#rega", "#regr"            \n\t"                    \
  65     "por    "#regb", "#regr"            \n\t"                    \
  66     "pxor   "#rega", "#regb"            \n\t"                    \
  67     "pand  "#regfe", "#regb"            \n\t"                    \
  68     "psrlq       $1, "#regb"            \n\t"                    \
  69     "psubb  "#regb", "#regr"            \n\t"
  70
  71 // mm6 is supposed to contain 0xfefefefefefefefe
  72 #define PAVGBP_MMX_NO_RND(rega, regb, regr,  regc, regd, regp)   \
  73     "movq  "#rega", "#regr"             \n\t"                    \
  74     "movq  "#regc", "#regp"             \n\t"                    \
  75     "pand  "#regb", "#regr"             \n\t"                    \
  76     "pand  "#regd", "#regp"             \n\t"                    \
  77     "pxor  "#rega", "#regb"             \n\t"                    \
  78     "pxor  "#regc", "#regd"             \n\t"                    \
  79     "pand    %%mm6, "#regb"             \n\t"                    \
  80     "pand    %%mm6, "#regd"             \n\t"                    \
  81     "psrlq      $1, "#regb"             \n\t"                    \
  82     "psrlq      $1, "#regd"             \n\t"                    \
  83     "paddb "#regb", "#regr"             \n\t"                    \
  84     "paddb "#regd", "#regp"             \n\t"
  85
  86 #define PAVGBP_MMX(rega, regb, regr, regc, regd, regp)           \
  87     "movq  "#rega", "#regr"             \n\t"                    \
  88     "movq  "#regc", "#regp"             \n\t"                    \
  89     "por   "#regb", "#regr"             \n\t"                    \
  90     "por   "#regd", "#regp"             \n\t"                    \
  91     "pxor  "#rega", "#regb"             \n\t"                    \
  92     "pxor  "#regc", "#regd"             \n\t"                    \
  93     "pand    %%mm6, "#regb"             \n\t"                    \
  94     "pand    %%mm6, "#regd"             \n\t"                    \
  95     "psrlq      $1, "#regd"             \n\t"                    \
  96     "psrlq      $1, "#regb"             \n\t"                    \
  97     "psubb "#regb", "#regr"             \n\t"                    \
  98     "psubb "#regd", "#regp"             \n\t"
  99
 100 #endif /* AVCODEC_X86_INLINE_ASM_H */