/********************************************************************

 *                                                                  *

 * THIS FILE IS PART OF THE OggTheora SOFTWARE CODEC SOURCE CODE.   *

 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *

 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *

 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *

 *                                                                  *

 * THE Theora SOURCE CODE IS COPYRIGHT (C) 2002-2009                *

 * by the Xiph.Org Foundation and contributors                      *

 * https://www.xiph.org/                                            *

 *                                                                  *

 ********************************************************************

  function:

 ********************************************************************/

#include "x86enc.h"

#if defined(OC_X86_ASM)

/*The default enquant table is not quite suitable for SIMD purposes.

  First, the m and l parameters need to be separated so that an entire row full

   of m's or l's can be loaded at a time.

  Second, x86 SIMD has no element-wise arithmetic right-shift, so we have to

   emulate one with a multiply.

  Therefore we translate the shift count into a scale factor.*/

void oc_enc_enquant_table_init_x86(void *_enquant,

 const ogg_uint16_t _dequant[64]){

  ogg_int16_t *m;

  ogg_int16_t *l;

  int          zzi;

  m=(ogg_int16_t *)_enquant;

  l=m+64;

  for(zzi=0;zzi<64;zzi++){

    oc_iquant q;

    oc_iquant_init(&q,_dequant[zzi]);

    m[zzi]=q.m;

    /*q.l must be at least 2 for this to work; fortunately, once all the scale

       factors are baked in, the minimum quantizer is much larger than that.*/

    l[zzi]=1<<16-q.l;

  }

}

void oc_enc_enquant_table_fixup_x86(void *_enquant[3][3][2],int _nqis){

  int pli;

  int qii;

  int qti;

  for(pli=0;pli<3;pli++)for(qii=1;qii<_nqis;qii++)for(qti=0;qti<2;qti++){

    ((ogg_int16_t *)_enquant[pli][qii][qti])[0]=

     ((ogg_int16_t *)_enquant[pli][0][qti])[0];

    ((ogg_int16_t *)_enquant[pli][qii][qti])[64]=

     ((ogg_int16_t *)_enquant[pli][0][qti])[64];

  }

}

int oc_enc_quantize_sse2(ogg_int16_t _qdct[64],const ogg_int16_t _dct[64],

 const ogg_uint16_t _dequant[64],const void *_enquant){

  ptrdiff_t r;

  __asm__ __volatile__(

    "xor %[r],%[r]\n\t"

    /*Loop through two rows at a time.*/

    ".p2align 4\n\t"

    "0:\n\t"

    /*Load the first two rows of the data and the quant matrices.*/

    "movdqa 0x00(%[dct],%[r]),%%xmm0\n\t"

    "movdqa 0x10(%[dct],%[r]),%%xmm1\n\t"

    "movdqa 0x00(%[dq],%[r]),%%xmm2\n\t"

    "movdqa 0x10(%[dq],%[r]),%%xmm3\n\t"

    "movdqa 0x00(%[q],%[r]),%%xmm4\n\t"

    "movdqa 0x10(%[q],%[r]),%%xmm5\n\t"

    /*Double the input and propagate its sign to the rounding factor.

      Using SSSE3's psignw would help here, but we need the mask later anyway.*/

    "movdqa %%xmm0,%%xmm6\n\t"

    "psraw $15,%%xmm0\n\t"

    "movdqa %%xmm1,%%xmm7\n\t"

    "paddw %%xmm6,%%xmm6\n\t"

    "psraw $15,%%xmm1\n\t"

    "paddw %%xmm7,%%xmm7\n\t"

    "paddw %%xmm0,%%xmm2\n\t"

    "paddw %%xmm1,%%xmm3\n\t"

    "pxor %%xmm0,%%xmm2\n\t"

    "pxor %%xmm1,%%xmm3\n\t"

    /*Add the rounding factor and perform the first multiply.*/

    "paddw %%xmm2,%%xmm6\n\t"

    "paddw %%xmm3,%%xmm7\n\t"

    "pmulhw %%xmm6,%%xmm4\n\t"

    "pmulhw %%xmm7,%%xmm5\n\t"

    "movdqa 0x80(%[q],%[r]),%%xmm2\n\t"

    "movdqa 0x90(%[q],%[r]),%%xmm3\n\t"

    "paddw %%xmm4,%%xmm6\n\t"

    "paddw %%xmm5,%%xmm7\n\t"

    /*Emulate an element-wise right-shift via a second multiply.*/

    "pmulhw %%xmm2,%%xmm6\n\t"

    "pmulhw %%xmm3,%%xmm7\n\t"

    "add $32,%[r]\n\t"

    "cmp $96,%[r]\n\t"

    /*Correct for the sign.*/

    "psubw %%xmm0,%%xmm6\n\t"

    "psubw %%xmm1,%%xmm7\n\t"

    /*Save the result.*/

    "movdqa %%xmm6,-0x20(%[qdct],%[r])\n\t"

    "movdqa %%xmm7,-0x10(%[qdct],%[r])\n\t"

    "jle 0b\n\t"

    /*Now find the location of the last non-zero value.*/

    "movdqa 0x50(%[qdct]),%%xmm5\n\t"

    "movdqa 0x40(%[qdct]),%%xmm4\n\t"

    "packsswb %%xmm7,%%xmm6\n\t"

    "packsswb %%xmm5,%%xmm4\n\t"

    "pxor %%xmm0,%%xmm0\n\t"

    "mov $-1,%k[dq]\n\t"

    "pcmpeqb %%xmm0,%%xmm6\n\t"

    "pcmpeqb %%xmm0,%%xmm4\n\t"

    "pmovmskb %%xmm6,%k[q]\n\t"

    "pmovmskb %%xmm4,%k[r]\n\t"

    "shl $16,%k[q]\n\t"

    "or %k[r],%k[q]\n\t"

    "mov $32,%[r]\n\t"

    /*We have to use xor here instead of not in order to set the flags.*/

    "xor %k[dq],%k[q]\n\t"

    "jnz 1f\n\t"

    "movdqa 0x30(%[qdct]),%%xmm7\n\t"

    "movdqa 0x20(%[qdct]),%%xmm6\n\t"

    "movdqa 0x10(%[qdct]),%%xmm5\n\t"

    "movdqa 0x00(%[qdct]),%%xmm4\n\t"

    "packsswb %%xmm7,%%xmm6\n\t"

    "packsswb %%xmm5,%%xmm4\n\t"

    "pcmpeqb %%xmm0,%%xmm6\n\t"

    "pcmpeqb %%xmm0,%%xmm4\n\t"

    "pmovmskb %%xmm6,%k[q]\n\t"

    "pmovmskb %%xmm4,%k[r]\n\t"

    "shl $16,%k[q]\n\t"

    "or %k[r],%k[q]\n\t"

    "xor %[r],%[r]\n\t"

    "not %k[q]\n\t"

    "or $1,%k[q]\n\t"

    "1:\n\t"

    "bsr %k[q],%k[q]\n\t"

    "add %k[q],%k[r]\n\t"

    :[r]"=&a"(r),[q]"+r"(_enquant),[dq]"+r"(_dequant)

    :[dct]"r"(_dct),[qdct]"r"(_qdct)

    :"cc","memory"

  );

  return (int)r;

}

#endif