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mmxidct.c

/********************************************************************
 *                                                                  *
 * 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) 2002-2007                *
 * by the Xiph.Org Foundation http://www.xiph.org/                  *
 *                                                                  *
 ********************************************************************

  function:
    last mod: $Id: mmxidct.c 14357 2008-01-04 20:05:28Z tterribe $

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

/*MMX acceleration of Theora's iDCT.
  Originally written by Rudolf Marek, based on code from On2's VP3.*/
#include <ogg/ogg.h>
#include "../dct.h"
#include "../idct.h"

#include "x86int.h"

#if defined(USE_ASM)

/*These are offsets into the table of constants below.*/
/*7 rows of cosines, in order: pi/16 * (1 ... 7).*/
#define OC_COSINE_OFFSET (0)
/*A row of 8's.*/
#define OC_EIGHT_OFFSET  (56)



/*A table of constants used by the MMX routines.*/
static const ogg_uint16_t __attribute__((aligned(8),used))
 OC_IDCT_CONSTS[(7+1)*4]={
  (ogg_uint16_t)OC_C1S7,(ogg_uint16_t)OC_C1S7,
  (ogg_uint16_t)OC_C1S7,(ogg_uint16_t)OC_C1S7,
  (ogg_uint16_t)OC_C2S6,(ogg_uint16_t)OC_C2S6,
  (ogg_uint16_t)OC_C2S6,(ogg_uint16_t)OC_C2S6,
  (ogg_uint16_t)OC_C3S5,(ogg_uint16_t)OC_C3S5,
  (ogg_uint16_t)OC_C3S5,(ogg_uint16_t)OC_C3S5,
  (ogg_uint16_t)OC_C4S4,(ogg_uint16_t)OC_C4S4,
  (ogg_uint16_t)OC_C4S4,(ogg_uint16_t)OC_C4S4,
  (ogg_uint16_t)OC_C5S3,(ogg_uint16_t)OC_C5S3,
  (ogg_uint16_t)OC_C5S3,(ogg_uint16_t)OC_C5S3,
  (ogg_uint16_t)OC_C6S2,(ogg_uint16_t)OC_C6S2,
  (ogg_uint16_t)OC_C6S2,(ogg_uint16_t)OC_C6S2,
  (ogg_uint16_t)OC_C7S1,(ogg_uint16_t)OC_C7S1,
  (ogg_uint16_t)OC_C7S1,(ogg_uint16_t)OC_C7S1,
      8,    8,    8,    8
};

/*Converts the expression in the argument to a string.*/
#define OC_M2STR(_s) #_s

/*38 cycles*/
#define OC_IDCT_BEGIN \
  "#OC_IDCT_BEGIN\n\t" \
  "movq "OC_I(3)",%%mm2\n\t" \
  "movq "OC_C(3)",%%mm6\n\t" \
  "movq %%mm2,%%mm4\n\t" \
  "movq "OC_J(5)",%%mm7\n\t" \
  "pmulhw %%mm6,%%mm4\n\t" \
  "movq "OC_C(5)",%%mm1\n\t" \
  "pmulhw %%mm7,%%mm6\n\t" \
  "movq %%mm1,%%mm5\n\t" \
  "pmulhw %%mm2,%%mm1\n\t" \
  "movq "OC_I(1)",%%mm3\n\t" \
  "pmulhw %%mm7,%%mm5\n\t" \
  "movq "OC_C(1)",%%mm0\n\t" \
  "paddw %%mm2,%%mm4\n\t" \
  "paddw %%mm7,%%mm6\n\t" \
  "paddw %%mm1,%%mm2\n\t" \
  "movq "OC_J(7)",%%mm1\n\t" \
  "paddw %%mm5,%%mm7\n\t" \
  "movq %%mm0,%%mm5\n\t" \
  "pmulhw %%mm3,%%mm0\n\t" \
  "paddw %%mm7,%%mm4\n\t" \
  "pmulhw %%mm1,%%mm5\n\t" \
  "movq "OC_C(7)",%%mm7\n\t" \
  "psubw %%mm2,%%mm6\n\t" \
  "paddw %%mm3,%%mm0\n\t" \
  "pmulhw %%mm7,%%mm3\n\t" \
  "movq "OC_I(2)",%%mm2\n\t" \
  "pmulhw %%mm1,%%mm7\n\t" \
  "paddw %%mm1,%%mm5\n\t" \
  "movq %%mm2,%%mm1\n\t" \
  "pmulhw "OC_C(2)",%%mm2\n\t" \
  "psubw %%mm5,%%mm3\n\t" \
  "movq "OC_J(6)",%%mm5\n\t" \
  "paddw %%mm7,%%mm0\n\t" \
  "movq %%mm5,%%mm7\n\t" \
  "psubw %%mm4,%%mm0\n\t" \
  "pmulhw "OC_C(2)",%%mm5\n\t" \
  "paddw %%mm1,%%mm2\n\t" \
  "pmulhw "OC_C(6)",%%mm1\n\t" \
  "paddw %%mm4,%%mm4\n\t" \
  "paddw %%mm0,%%mm4\n\t" \
  "psubw %%mm6,%%mm3\n\t" \
  "paddw %%mm7,%%mm5\n\t" \
  "paddw %%mm6,%%mm6\n\t" \
  "pmulhw "OC_C(6)",%%mm7\n\t" \
  "paddw %%mm3,%%mm6\n\t" \
  "movq %%mm4,"OC_I(1)"\n\t" \
  "psubw %%mm5,%%mm1\n\t" \
  "movq "OC_C(4)",%%mm4\n\t" \
  "movq %%mm3,%%mm5\n\t" \
  "pmulhw %%mm4,%%mm3\n\t" \
  "paddw %%mm2,%%mm7\n\t" \
  "movq %%mm6,"OC_I(2)"\n\t" \
  "movq %%mm0,%%mm2\n\t" \
  "movq "OC_I(0)",%%mm6\n\t" \
  "pmulhw %%mm4,%%mm0\n\t" \
  "paddw %%mm3,%%mm5\n\t" \
  "movq "OC_J(4)",%%mm3\n\t" \
  "psubw %%mm1,%%mm5\n\t" \
  "paddw %%mm0,%%mm2\n\t" \
  "psubw %%mm3,%%mm6\n\t" \
  "movq %%mm6,%%mm0\n\t" \
  "pmulhw %%mm4,%%mm6\n\t" \
  "paddw %%mm3,%%mm3\n\t" \
  "paddw %%mm1,%%mm1\n\t" \
  "paddw %%mm0,%%mm3\n\t" \
  "paddw %%mm5,%%mm1\n\t" \
  "pmulhw %%mm3,%%mm4\n\t" \
  "paddw %%mm0,%%mm6\n\t" \
  "psubw %%mm2,%%mm6\n\t" \
  "paddw %%mm2,%%mm2\n\t" \
  "movq "OC_I(1)",%%mm0\n\t" \
  "paddw %%mm6,%%mm2\n\t" \
  "paddw %%mm3,%%mm4\n\t" \
  "psubw %%mm1,%%mm2\n\t" \
  "#end OC_IDCT_BEGIN\n\t" \

/*38+8=46 cycles.*/
#define OC_ROW_IDCT \
  "#OC_ROW_IDCT\n" \
  OC_IDCT_BEGIN \
  /*r3=D'*/ \
  "movq "OC_I(2)",%%mm3\n\t" \
  /*r4=E'=E-G*/ \
  "psubw %%mm7,%%mm4\n\t" \
  /*r1=H'+H'*/ \
  "paddw %%mm1,%%mm1\n\t" \
  /*r7=G+G*/ \
  "paddw %%mm7,%%mm7\n\t" \
  /*r1=R1=A''+H'*/ \
  "paddw %%mm2,%%mm1\n\t" \
  /*r7=G'=E+G*/ \
  "paddw %%mm4,%%mm7\n\t" \
  /*r4=R4=E'-D'*/ \
  "psubw %%mm3,%%mm4\n\t" \
  "paddw %%mm3,%%mm3\n\t" \
  /*r6=R6=F'-B''*/ \
  "psubw %%mm5,%%mm6\n\t" \
  "paddw %%mm5,%%mm5\n\t" \
  /*r3=R3=E'+D'*/ \
  "paddw %%mm4,%%mm3\n\t" \
  /*r5=R5=F'+B''*/ \
  "paddw %%mm6,%%mm5\n\t" \
  /*r7=R7=G'-C'*/ \
  "psubw %%mm0,%%mm7\n\t" \
  "paddw %%mm0,%%mm0\n\t" \
  /*Save R1.*/ \
  "movq %%mm1,"OC_I(1)"\n\t" \
  /*r0=R0=G.+C.*/ \
  "paddw %%mm7,%%mm0\n\t" \
  "#end OC_ROW_IDCT\n\t" \

/*The following macro does two 4x4 transposes in place.
  At entry, we assume:
    r0 = a3 a2 a1 a0
  I(1) = b3 b2 b1 b0
    r2 = c3 c2 c1 c0
    r3 = d3 d2 d1 d0

    r4 = e3 e2 e1 e0
    r5 = f3 f2 f1 f0
    r6 = g3 g2 g1 g0
    r7 = h3 h2 h1 h0

  At exit, we have:
  I(0) = d0 c0 b0 a0
  I(1) = d1 c1 b1 a1
  I(2) = d2 c2 b2 a2
  I(3) = d3 c3 b3 a3

  J(4) = h0 g0 f0 e0
  J(5) = h1 g1 f1 e1
  J(6) = h2 g2 f2 e2
  J(7) = h3 g3 f3 e3

  I(0) I(1) I(2) I(3) is the transpose of r0 I(1) r2 r3.
  J(4) J(5) J(6) J(7) is the transpose of r4   r5 r6 r7.

  Since r1 is free at entry, we calculate the Js first.*/
/*19 cycles.*/
#define OC_TRANSPOSE \
  "#OC_TRANSPOSE\n\t" \
  "movq %%mm4,%%mm1\n\t" \
  "punpcklwd %%mm5,%%mm4\n\t" \
  "movq %%mm0,"OC_I(0)"\n\t" \
  "punpckhwd %%mm5,%%mm1\n\t" \
  "movq %%mm6,%%mm0\n\t" \
  "punpcklwd %%mm7,%%mm6\n\t" \
  "movq %%mm4,%%mm5\n\t" \
  "punpckldq %%mm6,%%mm4\n\t" \
  "punpckhdq %%mm6,%%mm5\n\t" \
  "movq %%mm1,%%mm6\n\t" \
  "movq %%mm4,"OC_J(4)"\n\t" \
  "punpckhwd %%mm7,%%mm0\n\t" \
  "movq %%mm5,"OC_J(5)"\n\t" \
  "punpckhdq %%mm0,%%mm6\n\t" \
  "movq "OC_I(0)",%%mm4\n\t" \
  "punpckldq %%mm0,%%mm1\n\t" \
  "movq "OC_I(1)",%%mm5\n\t" \
  "movq %%mm4,%%mm0\n\t" \
  "movq %%mm6,"OC_J(7)"\n\t" \
  "punpcklwd %%mm5,%%mm0\n\t" \
  "movq %%mm1,"OC_J(6)"\n\t" \
  "punpckhwd %%mm5,%%mm4\n\t" \
  "movq %%mm2,%%mm5\n\t" \
  "punpcklwd %%mm3,%%mm2\n\t" \
  "movq %%mm0,%%mm1\n\t" \
  "punpckldq %%mm2,%%mm0\n\t" \
  "punpckhdq %%mm2,%%mm1\n\t" \
  "movq %%mm4,%%mm2\n\t" \
  "movq %%mm0,"OC_I(0)"\n\t" \
  "punpckhwd %%mm3,%%mm5\n\t" \
  "movq %%mm1,"OC_I(1)"\n\t" \
  "punpckhdq %%mm5,%%mm4\n\t" \
  "punpckldq %%mm5,%%mm2\n\t" \
  "movq %%mm4,"OC_I(3)"\n\t" \
  "movq %%mm2,"OC_I(2)"\n\t" \
  "#end OC_TRANSPOSE\n\t" \

/*38+19=57 cycles.*/
#define OC_COLUMN_IDCT \
  "#OC_COLUMN_IDCT\n" \
  OC_IDCT_BEGIN \
  "paddw "OC_8",%%mm2\n\t" \
  /*r1=H'+H'*/ \
  "paddw %%mm1,%%mm1\n\t" \
  /*r1=R1=A''+H'*/ \
  "paddw %%mm2,%%mm1\n\t" \
  /*r2=NR2*/ \
  "psraw $4,%%mm2\n\t" \
  /*r4=E'=E-G*/ \
  "psubw %%mm7,%%mm4\n\t" \
  /*r1=NR1*/ \
  "psraw $4,%%mm1\n\t" \
  /*r3=D'*/ \
  "movq "OC_I(2)",%%mm3\n\t" \
  /*r7=G+G*/ \
  "paddw %%mm7,%%mm7\n\t" \
  /*Store NR2 at I(2).*/ \
  "movq %%mm2,"OC_I(2)"\n\t" \
  /*r7=G'=E+G*/ \
  "paddw %%mm4,%%mm7\n\t" \
  /*Store NR1 at I(1).*/ \
  "movq %%mm1,"OC_I(1)"\n\t" \
  /*r4=R4=E'-D'*/ \
  "psubw %%mm3,%%mm4\n\t" \
  "paddw "OC_8",%%mm4\n\t" \
  /*r3=D'+D'*/ \
  "paddw %%mm3,%%mm3\n\t" \
  /*r3=R3=E'+D'*/ \
  "paddw %%mm4,%%mm3\n\t" \
  /*r4=NR4*/ \
  "psraw $4,%%mm4\n\t" \
  /*r6=R6=F'-B''*/ \
  "psubw %%mm5,%%mm6\n\t" \
  /*r3=NR3*/ \
  "psraw $4,%%mm3\n\t" \
  "paddw "OC_8",%%mm6\n\t" \
  /*r5=B''+B''*/ \
  "paddw %%mm5,%%mm5\n\t" \
  /*r5=R5=F'+B''*/ \
  "paddw %%mm6,%%mm5\n\t" \
  /*r6=NR6*/ \
  "psraw $4,%%mm6\n\t" \
  /*Store NR4 at J(4).*/ \
  "movq %%mm4,"OC_J(4)"\n\t" \
  /*r5=NR5*/ \
  "psraw $4,%%mm5\n\t" \
  /*Store NR3 at I(3).*/ \
  "movq %%mm3,"OC_I(3)"\n\t" \
  /*r7=R7=G'-C'*/ \
  "psubw %%mm0,%%mm7\n\t" \
  "paddw "OC_8",%%mm7\n\t" \
  /*r0=C'+C'*/ \
  "paddw %%mm0,%%mm0\n\t" \
  /*r0=R0=G'+C'*/ \
  "paddw %%mm7,%%mm0\n\t" \
  /*r7=NR7*/ \
  "psraw $4,%%mm7\n\t" \
  /*Store NR6 at J(6).*/ \
  "movq %%mm6,"OC_J(6)"\n\t" \
  /*r0=NR0*/ \
  "psraw $4,%%mm0\n\t" \
  /*Store NR5 at J(5).*/ \
  "movq %%mm5,"OC_J(5)"\n\t" \
  /*Store NR7 at J(7).*/ \
  "movq %%mm7,"OC_J(7)"\n\t" \
  /*Store NR0 at I(0).*/ \
  "movq %%mm0,"OC_I(0)"\n\t" \
  "#end OC_COLUMN_IDCT\n\t" \

#define OC_MID(_m,_i) OC_M2STR(_m+(_i)*8)"(%[c])"
#define OC_C(_i)      OC_MID(OC_COSINE_OFFSET,_i-1)
#define OC_8          OC_MID(OC_EIGHT_OFFSET,0)

void oc_idct8x8_mmx(ogg_int16_t _y[64]){
  /*This routine accepts an 8x8 matrix, but in transposed form.
    Every 4x4 submatrix is transposed.*/
  __asm__ __volatile__(
#define OC_I(_k)      OC_M2STR((_k*16))"(%[y])"
#define OC_J(_k)      OC_M2STR(((_k-4)*16)+8)"(%[y])"
    OC_ROW_IDCT
    OC_TRANSPOSE
#undef  OC_I
#undef  OC_J
#define OC_I(_k)      OC_M2STR((_k*16)+64)"(%[y])"
#define OC_J(_k)      OC_M2STR(((_k-4)*16)+72)"(%[y])"
    OC_ROW_IDCT
    OC_TRANSPOSE
#undef  OC_I
#undef  OC_J
#define OC_I(_k)      OC_M2STR((_k*16))"(%[y])"
#define OC_J(_k)      OC_I(_k)
    OC_COLUMN_IDCT
#undef  OC_I
#undef  OC_J
#define OC_I(_k)      OC_M2STR((_k*16)+8)"(%[y])"
#define OC_J(_k)      OC_I(_k)
    OC_COLUMN_IDCT
#undef  OC_I
#undef  OC_J
    "emms\n\t"
    :
    :[y]"r"(_y),[c]"r"(OC_IDCT_CONSTS)
  );
}

/*25 cycles.*/
#define OC_IDCT_BEGIN_10 \
 "#OC_IDCT_BEGIN_10\n\t" \
 "movq "OC_I(3)",%%mm2\n\t" \
 "nop\n\t" \
 "movq "OC_C(3)",%%mm6\n\t" \
 "movq %%mm2,%%mm4\n\t" \
 "movq "OC_C(5)",%%mm1\n\t" \
 "pmulhw %%mm6,%%mm4\n\t" \
 "movq "OC_I(1)",%%mm3\n\t" \
 "pmulhw %%mm2,%%mm1\n\t" \
 "movq "OC_C(1)",%%mm0\n\t" \
 "paddw %%mm2,%%mm4\n\t" \
 "pxor %%mm6,%%mm6\n\t" \
 "paddw %%mm1,%%mm2\n\t" \
 "movq "OC_I(2)",%%mm5\n\t" \
 "pmulhw %%mm3,%%mm0\n\t" \
 "movq %%mm5,%%mm1\n\t" \
 "paddw %%mm3,%%mm0\n\t" \
 "pmulhw "OC_C(7)",%%mm3\n\t" \
 "psubw %%mm2,%%mm6\n\t" \
 "pmulhw "OC_C(2)",%%mm5\n\t" \
 "psubw %%mm4,%%mm0\n\t" \
 "movq "OC_I(2)",%%mm7\n\t" \
 "paddw %%mm4,%%mm4\n\t" \
 "paddw %%mm5,%%mm7\n\t" \
 "paddw %%mm0,%%mm4\n\t" \
 "pmulhw "OC_C(6)",%%mm1\n\t" \
 "psubw %%mm6,%%mm3\n\t" \
 "movq %%mm4,"OC_I(1)"\n\t" \
 "paddw %%mm6,%%mm6\n\t" \
 "movq "OC_C(4)",%%mm4\n\t" \
 "paddw %%mm3,%%mm6\n\t" \
 "movq %%mm3,%%mm5\n\t" \
 "pmulhw %%mm4,%%mm3\n\t" \
 "movq %%mm6,"OC_I(2)"\n\t" \
 "movq %%mm0,%%mm2\n\t" \
 "movq "OC_I(0)",%%mm6\n\t" \
 "pmulhw %%mm4,%%mm0\n\t" \
 "paddw %%mm3,%%mm5\n\t" \
 "paddw %%mm0,%%mm2\n\t" \
 "psubw %%mm1,%%mm5\n\t" \
 "pmulhw %%mm4,%%mm6\n\t" \
 "paddw "OC_I(0)",%%mm6\n\t" \
 "paddw %%mm1,%%mm1\n\t" \
 "movq %%mm6,%%mm4\n\t" \
 "paddw %%mm5,%%mm1\n\t" \
 "psubw %%mm2,%%mm6\n\t" \
 "paddw %%mm2,%%mm2\n\t" \
 "movq "OC_I(1)",%%mm0\n\t" \
 "paddw %%mm6,%%mm2\n\t" \
 "psubw %%mm1,%%mm2\n\t" \
 "nop\n\t" \
 "#end OC_IDCT_BEGIN_10\n\t" \

/*25+8=33 cycles.*/
#define OC_ROW_IDCT_10 \
 "#OC_ROW_IDCT_10\n\t" \
 OC_IDCT_BEGIN_10 \
 /*r3=D'*/ \
 "movq "OC_I(2)",%%mm3\n\t" \
 /*r4=E'=E-G*/ \
 "psubw %%mm7,%%mm4\n\t" \
 /*r1=H'+H'*/ \
 "paddw %%mm1,%%mm1\n\t" \
 /*r7=G+G*/ \
 "paddw %%mm7,%%mm7\n\t" \
 /*r1=R1=A''+H'*/ \
 "paddw %%mm2,%%mm1\n\t" \
 /*r7=G'=E+G*/ \
 "paddw %%mm4,%%mm7\n\t" \
 /*r4=R4=E'-D'*/ \
 "psubw %%mm3,%%mm4\n\t" \
 "paddw %%mm3,%%mm3\n\t" \
 /*r6=R6=F'-B''*/ \
 "psubw %%mm5,%%mm6\n\t" \
 "paddw %%mm5,%%mm5\n\t" \
 /*r3=R3=E'+D'*/ \
 "paddw %%mm4,%%mm3\n\t" \
 /*r5=R5=F'+B''*/ \
 "paddw %%mm6,%%mm5\n\t" \
 /*r7=R7=G'-C'*/ \
 "psubw %%mm0,%%mm7\n\t" \
 "paddw %%mm0,%%mm0\n\t" \
 /*Save R1.*/ \
 "movq %%mm1,"OC_I(1)"\n\t" \
 /*r0=R0=G'+C'*/ \
 "paddw %%mm7,%%mm0\n\t" \
 "#end OC_ROW_IDCT_10\n\t" \

/*25+19=44 cycles'*/
#define OC_COLUMN_IDCT_10 \
 "#OC_COLUMN_IDCT_10\n\t" \
 OC_IDCT_BEGIN_10 \
 "paddw "OC_8",%%mm2\n\t" \
 /*r1=H'+H'*/ \
 "paddw %%mm1,%%mm1\n\t" \
 /*r1=R1=A''+H'*/ \
 "paddw %%mm2,%%mm1\n\t" \
 /*r2=NR2*/ \
 "psraw $4,%%mm2\n\t" \
 /*r4=E'=E-G*/ \
 "psubw %%mm7,%%mm4\n\t" \
 /*r1=NR1*/ \
 "psraw $4,%%mm1\n\t" \
 /*r3=D'*/ \
 "movq "OC_I(2)",%%mm3\n\t" \
 /*r7=G+G*/ \
 "paddw %%mm7,%%mm7\n\t" \
 /*Store NR2 at I(2).*/ \
 "movq %%mm2,"OC_I(2)"\n\t" \
 /*r7=G'=E+G*/ \
 "paddw %%mm4,%%mm7\n\t" \
 /*Store NR1 at I(1).*/ \
 "movq %%mm1,"OC_I(1)"\n\t" \
 /*r4=R4=E'-D'*/ \
 "psubw %%mm3,%%mm4\n\t" \
 "paddw "OC_8",%%mm4\n\t" \
 /*r3=D'+D'*/ \
 "paddw %%mm3,%%mm3\n\t" \
 /*r3=R3=E'+D'*/ \
 "paddw %%mm4,%%mm3\n\t" \
 /*r4=NR4*/ \
 "psraw $4,%%mm4\n\t" \
 /*r6=R6=F'-B''*/ \
 "psubw %%mm5,%%mm6\n\t" \
 /*r3=NR3*/ \
 "psraw $4,%%mm3\n\t" \
 "paddw "OC_8",%%mm6\n\t" \
 /*r5=B''+B''*/ \
 "paddw %%mm5,%%mm5\n\t" \
 /*r5=R5=F'+B''*/ \
 "paddw %%mm6,%%mm5\n\t" \
 /*r6=NR6*/ \
 "psraw $4,%%mm6\n\t" \
 /*Store NR4 at J(4).*/ \
 "movq %%mm4,"OC_J(4)"\n\t" \
 /*r5=NR5*/ \
 "psraw $4,%%mm5\n\t" \
 /*Store NR3 at I(3).*/ \
 "movq %%mm3,"OC_I(3)"\n\t" \
 /*r7=R7=G'-C'*/ \
 "psubw %%mm0,%%mm7\n\t" \
 "paddw "OC_8",%%mm7\n\t" \
 /*r0=C'+C'*/ \
 "paddw %%mm0,%%mm0\n\t" \
 /*r0=R0=G'+C'*/ \
 "paddw %%mm7,%%mm0\n\t" \
 /*r7=NR7*/ \
 "psraw $4,%%mm7\n\t" \
 /*Store NR6 at J(6).*/ \
 "movq %%mm6,"OC_J(6)"\n\t" \
 /*r0=NR0*/ \
 "psraw $4,%%mm0\n\t" \
 /*Store NR5 at J(5).*/ \
 "movq %%mm5,"OC_J(5)"\n\t" \
 /*Store NR7 at J(7).*/ \
 "movq %%mm7,"OC_J(7)"\n\t" \
 /*Store NR0 at I(0).*/ \
 "movq %%mm0,"OC_I(0)"\n\t" \
 "#end OC_COLUMN_IDCT_10\n\t" \

void oc_idct8x8_10_mmx(ogg_int16_t _y[64]){
  __asm__ __volatile__(
#define OC_I(_k) OC_M2STR((_k*16))"(%[y])"
#define OC_J(_k) OC_M2STR(((_k-4)*16)+8)"(%[y])"
    /*Done with dequant, descramble, and partial transpose.
      Now do the iDCT itself.*/
    OC_ROW_IDCT_10
    OC_TRANSPOSE
#undef  OC_I
#undef  OC_J
#define OC_I(_k) OC_M2STR((_k*16))"(%[y])"
#define OC_J(_k) OC_I(_k)
    OC_COLUMN_IDCT_10
#undef  OC_I
#undef  OC_J
#define OC_I(_k) OC_M2STR((_k*16)+8)"(%[y])"
#define OC_J(_k) OC_I(_k)
    OC_COLUMN_IDCT_10
#undef  OC_I
#undef  OC_J
    "emms\n\t"
    :
    :[y]"r"(_y),[c]"r"(OC_IDCT_CONSTS)
  );
}
#endif

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