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ffmpeg / libavcodec / i386 / dsputil_h264_template_mmx.c @ d2bb7db1

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/*
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 * Copyright (c) 2005 Zoltan Hidvegi <hzoli -a- hzoli -d- com>
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 *
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 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 */
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/**
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 * MMX optimized version of (put|avg)_h264_chroma_mc8.
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 * H264_CHROMA_MC8_TMPL must be defined to the desired function name and
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 * H264_CHROMA_OP must be defined to empty for put and pavgb/pavgusb for avg.
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 */
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static void H264_CHROMA_MC8_TMPL(uint8_t *dst/*align 8*/, uint8_t *src/*align 1*/, int stride, int h, int x, int y)
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{
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    uint64_t AA __align8;
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    uint64_t DD __align8;
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    unsigned long srcos = (long)src & 7;
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    uint64_t sh1 __align8 = srcos * 8;
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    uint64_t sh2 __align8 = 56 - sh1;
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    int i;
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    assert(x<8 && y<8 && x>=0 && y>=0);
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    asm volatile("movd %1, %%mm4\n\t"
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                 "movd %2, %%mm6\n\t"
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                 "punpcklwd %%mm4, %%mm4\n\t"
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                 "punpcklwd %%mm6, %%mm6\n\t"
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                 "punpckldq %%mm4, %%mm4\n\t" /* mm4 = x words */
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                 "punpckldq %%mm6, %%mm6\n\t" /* mm6 = y words */
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                 "movq %%mm4, %%mm5\n\t"
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                 "pmullw %%mm6, %%mm4\n\t"    /* mm4 = x * y */
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                 "psllw $3, %%mm5\n\t"
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                 "psllw $3, %%mm6\n\t"
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                 "movq %%mm5, %%mm7\n\t"
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                 "paddw %%mm6, %%mm7\n\t"
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                 "movq %%mm4, %0\n\t"         /* DD = x * y */
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                 "psubw %%mm4, %%mm5\n\t"     /* mm5 = B = 8x - xy */
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                 "psubw %%mm4, %%mm6\n\t"     /* mm6 = C = 8y - xy */
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                 "paddw %3, %%mm4\n\t"
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                 "psubw %%mm7, %%mm4\n\t"     /* mm4 = A = xy - (8x+8y) + 64 */
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                 "pxor %%mm7, %%mm7\n\t"
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                 : "=m" (DD) : "rm" (x), "rm" (y), "m" (ff_pw_64));
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    asm volatile("movq %%mm4, %0" : "=m" (AA));
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    src -= srcos;
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    asm volatile(
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        /* mm0 = src[0..7], mm1 = src[1..8] */
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        "movq %0, %%mm1\n\t"
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        "movq %1, %%mm0\n\t"
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        "psrlq %2, %%mm1\n\t"
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        "psllq %3, %%mm0\n\t"
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        "movq %%mm0, %%mm4\n\t"
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        "psllq $8, %%mm0\n\t"
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        "por %%mm1, %%mm0\n\t"
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        "psrlq $8, %%mm1\n\t"
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        "por %%mm4, %%mm1\n\t"
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        : : "m" (src[0]), "m" (src[8]), "m" (sh1), "m" (sh2));
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    for(i=0; i<h; i++) {
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        asm volatile(
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            /* [mm2,mm3] = A * src[0..7] */
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            "movq %%mm0, %%mm2\n\t"
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            "punpcklbw %%mm7, %%mm2\n\t"
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            "pmullw %0, %%mm2\n\t"
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            "movq %%mm0, %%mm3\n\t"
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            "punpckhbw %%mm7, %%mm3\n\t"
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            "pmullw %0, %%mm3\n\t"
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            /* [mm2,mm3] += B * src[1..8] */
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            "movq %%mm1, %%mm0\n\t"
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            "punpcklbw %%mm7, %%mm0\n\t"
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            "pmullw %%mm5, %%mm0\n\t"
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            "punpckhbw %%mm7, %%mm1\n\t"
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            "pmullw %%mm5, %%mm1\n\t"
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            "paddw %%mm0, %%mm2\n\t"
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            "paddw %%mm1, %%mm3\n\t"
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            : : "m" (AA));
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        src += stride;
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        asm volatile(
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            /* mm0 = src[0..7], mm1 = src[1..8] */
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            "movq %0, %%mm1\n\t"
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            "movq %1, %%mm0\n\t"
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            "psrlq %2, %%mm1\n\t"
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            "psllq %3, %%mm0\n\t"
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            "movq %%mm0, %%mm4\n\t"
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            "psllq $8, %%mm0\n\t"
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            "por %%mm1, %%mm0\n\t"
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            "psrlq $8, %%mm1\n\t"
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            "por %%mm4, %%mm1\n\t"
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            : : "m" (src[0]), "m" (src[8]), "m" (sh1), "m" (sh2));
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        asm volatile(
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            /* [mm2,mm3] += C *  src[0..7] */
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            "movq %mm0, %mm4\n\t"
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            "punpcklbw %mm7, %mm4\n\t"
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            "pmullw %mm6, %mm4\n\t"
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            "paddw %mm4, %mm2\n\t"
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            "movq %mm0, %mm4\n\t"
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            "punpckhbw %mm7, %mm4\n\t"
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            "pmullw %mm6, %mm4\n\t"
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            "paddw %mm4, %mm3\n\t");
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        asm volatile(
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            /* [mm2,mm3] += D *  src[1..8] */
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            "movq %%mm1, %%mm4\n\t"
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            "punpcklbw %%mm7, %%mm4\n\t"
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            "pmullw %0, %%mm4\n\t"
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            "paddw %%mm4, %%mm2\n\t"
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            "movq %%mm1, %%mm4\n\t"
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            "punpckhbw %%mm7, %%mm4\n\t"
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            "pmullw %0, %%mm4\n\t"
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            "paddw %%mm4, %%mm3\n\t"
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            : : "m" (DD));
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        asm volatile(
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            /* dst[0..7] = pack(([mm2,mm3] + 32) >> 6) */
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            "paddw %1, %%mm2\n\t"
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            "paddw %1, %%mm3\n\t"
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            "psrlw $6, %%mm2\n\t"
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            "psrlw $6, %%mm3\n\t"
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            "packuswb %%mm3, %%mm2\n\t"
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            H264_CHROMA_OP(%0, %%mm2)
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            "movq %%mm2, %0\n\t"
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            : "=m" (dst[0]) : "m" (ff_pw_32));
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        dst+= stride;
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    }
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}