h264_template_altivec.c

ffmpeg的完整源代码和作者自己写的文档。不但有在Linux的工程哦

  const vec_u8_t srcP0a = vec_ld(0, srcbis += srcStride);
  const vec_u8_t srcP0b = vec_ld(16, srcbis);
  const vec_u8_t srcP0 = vec_perm(srcP0a, srcP0b, perm);
//  srcbis += srcStride;
  const vec_u8_t srcP1a = vec_ld(0, srcbis += srcStride);
  const vec_u8_t srcP1b = vec_ld(16, srcbis);
  const vec_u8_t srcP1 = vec_perm(srcP1a, srcP1b, perm);
//  srcbis += srcStride;
  const vec_u8_t srcP2a = vec_ld(0, srcbis += srcStride);
  const vec_u8_t srcP2b = vec_ld(16, srcbis);
  const vec_u8_t srcP2 = vec_perm(srcP2a, srcP2b, perm);
//  srcbis += srcStride;

  vec_s16_t srcM2ssA = (vec_s16_t) vec_mergeh(zero_u8v, srcM2);
  vec_s16_t srcM2ssB = (vec_s16_t) vec_mergel(zero_u8v, srcM2);
  vec_s16_t srcM1ssA = (vec_s16_t) vec_mergeh(zero_u8v, srcM1);
  vec_s16_t srcM1ssB = (vec_s16_t) vec_mergel(zero_u8v, srcM1);
  vec_s16_t srcP0ssA = (vec_s16_t) vec_mergeh(zero_u8v, srcP0);
  vec_s16_t srcP0ssB = (vec_s16_t) vec_mergel(zero_u8v, srcP0);
  vec_s16_t srcP1ssA = (vec_s16_t) vec_mergeh(zero_u8v, srcP1);
  vec_s16_t srcP1ssB = (vec_s16_t) vec_mergel(zero_u8v, srcP1);
  vec_s16_t srcP2ssA = (vec_s16_t) vec_mergeh(zero_u8v, srcP2);
  vec_s16_t srcP2ssB = (vec_s16_t) vec_mergel(zero_u8v, srcP2);

  vec_s16_t pp1A, pp1B, pp2A, pp2B, pp3A, pp3B,
                      psumA, psumB, sumA, sumB,
                      srcP3ssA, srcP3ssB,
                      sum1A, sum1B, sum2A, sum2B, sum3A, sum3B;

  vec_u8_t sum, vdst, fsum, srcP3a, srcP3b, srcP3;

  POWERPC_PERF_START_COUNT(PREFIX_h264_qpel16_v_lowpass_num, 1);

  for (i = 0 ; i < 16 ; i++) {
    srcP3a = vec_ld(0, srcbis += srcStride);
    srcP3b = vec_ld(16, srcbis);
    srcP3 = vec_perm(srcP3a, srcP3b, perm);
    srcP3ssA = (vec_s16_t) vec_mergeh(zero_u8v, srcP3);
    srcP3ssB = (vec_s16_t) vec_mergel(zero_u8v, srcP3);
//    srcbis += srcStride;

    sum1A = vec_adds(srcP0ssA, srcP1ssA);
    sum1B = vec_adds(srcP0ssB, srcP1ssB);
    sum2A = vec_adds(srcM1ssA, srcP2ssA);
    sum2B = vec_adds(srcM1ssB, srcP2ssB);
    sum3A = vec_adds(srcM2ssA, srcP3ssA);
    sum3B = vec_adds(srcM2ssB, srcP3ssB);

    srcM2ssA = srcM1ssA;
    srcM2ssB = srcM1ssB;
    srcM1ssA = srcP0ssA;
    srcM1ssB = srcP0ssB;
    srcP0ssA = srcP1ssA;
    srcP0ssB = srcP1ssB;
    srcP1ssA = srcP2ssA;
    srcP1ssB = srcP2ssB;
    srcP2ssA = srcP3ssA;
    srcP2ssB = srcP3ssB;

    pp1A = vec_mladd(sum1A, v20ss, v16ss);
    pp1B = vec_mladd(sum1B, v20ss, v16ss);

    pp2A = vec_mladd(sum2A, v5ss, zero_s16v);
    pp2B = vec_mladd(sum2B, v5ss, zero_s16v);

    pp3A = vec_add(sum3A, pp1A);
    pp3B = vec_add(sum3B, pp1B);

    psumA = vec_sub(pp3A, pp2A);
    psumB = vec_sub(pp3B, pp2B);

    sumA = vec_sra(psumA, v5us);
    sumB = vec_sra(psumB, v5us);

    sum = vec_packsu(sumA, sumB);

    ASSERT_ALIGNED(dst);
    vdst = vec_ld(0, dst);

    OP_U8_ALTIVEC(fsum, sum, vdst);

    vec_st(fsum, 0, dst);

    dst += dstStride;
  }
  POWERPC_PERF_STOP_COUNT(PREFIX_h264_qpel16_v_lowpass_num, 1);
}

/* this code assume stride % 16 == 0 *and* tmp is properly aligned */
static void PREFIX_h264_qpel16_hv_lowpass_altivec(uint8_t * dst, int16_t * tmp, uint8_t * src, int dstStride, int tmpStride, int srcStride) {
  POWERPC_PERF_DECLARE(PREFIX_h264_qpel16_hv_lowpass_num, 1);
  register int i;
  LOAD_ZERO;
  const vec_u8_t permM2 = vec_lvsl(-2, src);
  const vec_u8_t permM1 = vec_lvsl(-1, src);
  const vec_u8_t permP0 = vec_lvsl(+0, src);
  const vec_u8_t permP1 = vec_lvsl(+1, src);
  const vec_u8_t permP2 = vec_lvsl(+2, src);
  const vec_u8_t permP3 = vec_lvsl(+3, src);
  const vec_s16_t v20ss = vec_sl(vec_splat_s16(5),vec_splat_u16(2));
  const vec_u32_t v10ui = vec_splat_u32(10);
  const vec_s16_t v5ss = vec_splat_s16(5);
  const vec_s16_t v1ss = vec_splat_s16(1);
  const vec_s32_t v512si = vec_sl(vec_splat_s32(1),vec_splat_u32(9));
  const vec_u32_t v16ui = vec_sl(vec_splat_u32(1),vec_splat_u32(4));

  register int align = ((((unsigned long)src) - 2) % 16);

  vec_s16_t srcP0A, srcP0B, srcP1A, srcP1B,
                      srcP2A, srcP2B, srcP3A, srcP3B,
                      srcM1A, srcM1B, srcM2A, srcM2B,
                      sum1A, sum1B, sum2A, sum2B, sum3A, sum3B,
                      pp1A, pp1B, pp2A, pp2B, psumA, psumB;

  const vec_u8_t mperm = (const vec_u8_t)
    AVV(0x00, 0x08, 0x01, 0x09, 0x02, 0x0A, 0x03, 0x0B,
        0x04, 0x0C, 0x05, 0x0D, 0x06, 0x0E, 0x07, 0x0F);
  int16_t *tmpbis = tmp;

  vec_s16_t tmpM1ssA, tmpM1ssB, tmpM2ssA, tmpM2ssB,
                      tmpP0ssA, tmpP0ssB, tmpP1ssA, tmpP1ssB,
                      tmpP2ssA, tmpP2ssB;

  vec_s32_t pp1Ae, pp1Ao, pp1Be, pp1Bo, pp2Ae, pp2Ao, pp2Be, pp2Bo,
                    pp3Ae, pp3Ao, pp3Be, pp3Bo, pp1cAe, pp1cAo, pp1cBe, pp1cBo,
                    pp32Ae, pp32Ao, pp32Be, pp32Bo, sumAe, sumAo, sumBe, sumBo,
                    ssumAe, ssumAo, ssumBe, ssumBo;
  vec_u8_t fsum, sumv, sum, vdst;
  vec_s16_t ssume, ssumo;

  POWERPC_PERF_START_COUNT(PREFIX_h264_qpel16_hv_lowpass_num, 1);
  src -= (2 * srcStride);
  for (i = 0 ; i < 21 ; i ++) {
    vec_u8_t srcM2, srcM1, srcP0, srcP1, srcP2, srcP3;
    vec_u8_t srcR1 = vec_ld(-2, src);
    vec_u8_t srcR2 = vec_ld(14, src);

    switch (align) {
    default: {
      srcM2 = vec_perm(srcR1, srcR2, permM2);
      srcM1 = vec_perm(srcR1, srcR2, permM1);
      srcP0 = vec_perm(srcR1, srcR2, permP0);
      srcP1 = vec_perm(srcR1, srcR2, permP1);
      srcP2 = vec_perm(srcR1, srcR2, permP2);
      srcP3 = vec_perm(srcR1, srcR2, permP3);
    } break;
    case 11: {
      srcM2 = vec_perm(srcR1, srcR2, permM2);
      srcM1 = vec_perm(srcR1, srcR2, permM1);
      srcP0 = vec_perm(srcR1, srcR2, permP0);
      srcP1 = vec_perm(srcR1, srcR2, permP1);
      srcP2 = vec_perm(srcR1, srcR2, permP2);
      srcP3 = srcR2;
    } break;
    case 12: {
      vec_u8_t srcR3 = vec_ld(30, src);
      srcM2 = vec_perm(srcR1, srcR2, permM2);
      srcM1 = vec_perm(srcR1, srcR2, permM1);
      srcP0 = vec_perm(srcR1, srcR2, permP0);
      srcP1 = vec_perm(srcR1, srcR2, permP1);
      srcP2 = srcR2;
      srcP3 = vec_perm(srcR2, srcR3, permP3);
    } break;
    case 13: {
      vec_u8_t srcR3 = vec_ld(30, src);
      srcM2 = vec_perm(srcR1, srcR2, permM2);
      srcM1 = vec_perm(srcR1, srcR2, permM1);
      srcP0 = vec_perm(srcR1, srcR2, permP0);
      srcP1 = srcR2;
      srcP2 = vec_perm(srcR2, srcR3, permP2);
      srcP3 = vec_perm(srcR2, srcR3, permP3);
    } break;
    case 14: {
      vec_u8_t srcR3 = vec_ld(30, src);
      srcM2 = vec_perm(srcR1, srcR2, permM2);
      srcM1 = vec_perm(srcR1, srcR2, permM1);
      srcP0 = srcR2;
      srcP1 = vec_perm(srcR2, srcR3, permP1);
      srcP2 = vec_perm(srcR2, srcR3, permP2);
      srcP3 = vec_perm(srcR2, srcR3, permP3);
    } break;
    case 15: {
      vec_u8_t srcR3 = vec_ld(30, src);
      srcM2 = vec_perm(srcR1, srcR2, permM2);
      srcM1 = srcR2;
      srcP0 = vec_perm(srcR2, srcR3, permP0);
      srcP1 = vec_perm(srcR2, srcR3, permP1);
      srcP2 = vec_perm(srcR2, srcR3, permP2);
      srcP3 = vec_perm(srcR2, srcR3, permP3);
    } break;
    }

    srcP0A = (vec_s16_t) vec_mergeh(zero_u8v, srcP0);
    srcP0B = (vec_s16_t) vec_mergel(zero_u8v, srcP0);
    srcP1A = (vec_s16_t) vec_mergeh(zero_u8v, srcP1);
    srcP1B = (vec_s16_t) vec_mergel(zero_u8v, srcP1);

    srcP2A = (vec_s16_t) vec_mergeh(zero_u8v, srcP2);
    srcP2B = (vec_s16_t) vec_mergel(zero_u8v, srcP2);
    srcP3A = (vec_s16_t) vec_mergeh(zero_u8v, srcP3);
    srcP3B = (vec_s16_t) vec_mergel(zero_u8v, srcP3);

    srcM1A = (vec_s16_t) vec_mergeh(zero_u8v, srcM1);
    srcM1B = (vec_s16_t) vec_mergel(zero_u8v, srcM1);
    srcM2A = (vec_s16_t) vec_mergeh(zero_u8v, srcM2);
    srcM2B = (vec_s16_t) vec_mergel(zero_u8v, srcM2);

    sum1A = vec_adds(srcP0A, srcP1A);
    sum1B = vec_adds(srcP0B, srcP1B);
    sum2A = vec_adds(srcM1A, srcP2A);
    sum2B = vec_adds(srcM1B, srcP2B);
    sum3A = vec_adds(srcM2A, srcP3A);
    sum3B = vec_adds(srcM2B, srcP3B);

    pp1A = vec_mladd(sum1A, v20ss, sum3A);
    pp1B = vec_mladd(sum1B, v20ss, sum3B);

    pp2A = vec_mladd(sum2A, v5ss, zero_s16v);
    pp2B = vec_mladd(sum2B, v5ss, zero_s16v);

    psumA = vec_sub(pp1A, pp2A);
    psumB = vec_sub(pp1B, pp2B);

    vec_st(psumA, 0, tmp);
    vec_st(psumB, 16, tmp);

    src += srcStride;
    tmp += tmpStride; /* int16_t*, and stride is 16, so it's OK here */
  }

  tmpM2ssA = vec_ld(0, tmpbis);
  tmpM2ssB = vec_ld(16, tmpbis);
  tmpbis += tmpStride;
  tmpM1ssA = vec_ld(0, tmpbis);
  tmpM1ssB = vec_ld(16, tmpbis);
  tmpbis += tmpStride;
  tmpP0ssA = vec_ld(0, tmpbis);
  tmpP0ssB = vec_ld(16, tmpbis);
  tmpbis += tmpStride;
  tmpP1ssA = vec_ld(0, tmpbis);
  tmpP1ssB = vec_ld(16, tmpbis);
  tmpbis += tmpStride;
  tmpP2ssA = vec_ld(0, tmpbis);
  tmpP2ssB = vec_ld(16, tmpbis);
  tmpbis += tmpStride;

  for (i = 0 ; i < 16 ; i++) {
    const vec_s16_t tmpP3ssA = vec_ld(0, tmpbis);
    const vec_s16_t tmpP3ssB = vec_ld(16, tmpbis);

    const vec_s16_t sum1A = vec_adds(tmpP0ssA, tmpP1ssA);
    const vec_s16_t sum1B = vec_adds(tmpP0ssB, tmpP1ssB);
    const vec_s16_t sum2A = vec_adds(tmpM1ssA, tmpP2ssA);
    const vec_s16_t sum2B = vec_adds(tmpM1ssB, tmpP2ssB);
    const vec_s16_t sum3A = vec_adds(tmpM2ssA, tmpP3ssA);
    const vec_s16_t sum3B = vec_adds(tmpM2ssB, tmpP3ssB);

    tmpbis += tmpStride;

    tmpM2ssA = tmpM1ssA;
    tmpM2ssB = tmpM1ssB;
    tmpM1ssA = tmpP0ssA;
    tmpM1ssB = tmpP0ssB;
    tmpP0ssA = tmpP1ssA;
    tmpP0ssB = tmpP1ssB;
    tmpP1ssA = tmpP2ssA;
    tmpP1ssB = tmpP2ssB;
    tmpP2ssA = tmpP3ssA;
    tmpP2ssB = tmpP3ssB;

    pp1Ae = vec_mule(sum1A, v20ss);
    pp1Ao = vec_mulo(sum1A, v20ss);
    pp1Be = vec_mule(sum1B, v20ss);
    pp1Bo = vec_mulo(sum1B, v20ss);

    pp2Ae = vec_mule(sum2A, v5ss);
    pp2Ao = vec_mulo(sum2A, v5ss);
    pp2Be = vec_mule(sum2B, v5ss);
    pp2Bo = vec_mulo(sum2B, v5ss);

    pp3Ae = vec_sra((vec_s32_t)sum3A, v16ui);
    pp3Ao = vec_mulo(sum3A, v1ss);
    pp3Be = vec_sra((vec_s32_t)sum3B, v16ui);
    pp3Bo = vec_mulo(sum3B, v1ss);

    pp1cAe = vec_add(pp1Ae, v512si);
    pp1cAo = vec_add(pp1Ao, v512si);
    pp1cBe = vec_add(pp1Be, v512si);
    pp1cBo = vec_add(pp1Bo, v512si);

    pp32Ae = vec_sub(pp3Ae, pp2Ae);
    pp32Ao = vec_sub(pp3Ao, pp2Ao);
    pp32Be = vec_sub(pp3Be, pp2Be);
    pp32Bo = vec_sub(pp3Bo, pp2Bo);

    sumAe = vec_add(pp1cAe, pp32Ae);
    sumAo = vec_add(pp1cAo, pp32Ao);
    sumBe = vec_add(pp1cBe, pp32Be);
    sumBo = vec_add(pp1cBo, pp32Bo);

    ssumAe = vec_sra(sumAe, v10ui);
    ssumAo = vec_sra(sumAo, v10ui);
    ssumBe = vec_sra(sumBe, v10ui);
    ssumBo = vec_sra(sumBo, v10ui);

    ssume = vec_packs(ssumAe, ssumBe);
    ssumo = vec_packs(ssumAo, ssumBo);

    sumv = vec_packsu(ssume, ssumo);
    sum = vec_perm(sumv, sumv, mperm);

    ASSERT_ALIGNED(dst);
    vdst = vec_ld(0, dst);

    OP_U8_ALTIVEC(fsum, sum, vdst);

    vec_st(fsum, 0, dst);

    dst += dstStride;
  }
  POWERPC_PERF_STOP_COUNT(PREFIX_h264_qpel16_hv_lowpass_num, 1);
}