internal_bfin.S 19.5 KB
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/*
 * Copyright (C) 2007 Marc Hoffman <marc.hoffman@analog.com>
 *                    April 20, 2007
 *
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 * Blackfin video color space converter operations
 * convert I420 YV12 to RGB in various formats
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 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */


/*
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YUV420 to RGB565 conversion. This routine takes a YUV 420 planar macroblock
and converts it to RGB565. R:5 bits, G:6 bits, B:5 bits.. packed into shorts.
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The following calculation is used for the conversion:
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  r = clipz((y-oy)*cy  + crv*(v-128))
  g = clipz((y-oy)*cy  + cgv*(v-128) + cgu*(u-128))
  b = clipz((y-oy)*cy  + cbu*(u-128))
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y,u,v are prescaled by a factor of 4 i.e. left-shifted to gain precision.
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New factorization to eliminate the truncation error which was
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occurring due to the byteop3p.
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1) Use the bytop16m to subtract quad bytes we use this in U8 this
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 then so the offsets need to be renormalized to 8bits.
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2) Scale operands up by a factor of 4 not 8 because Blackfin
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   multiplies include a shift.
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3) Compute into the accumulators cy*yx0, cy*yx1.
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4) Compute each of the linear equations:
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     r = clipz((y - oy) * cy  + crv * (v - 128))
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     g = clipz((y - oy) * cy  + cgv * (v - 128) + cgu * (u - 128))
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     b = clipz((y - oy) * cy  + cbu * (u - 128))
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   Reuse of the accumulators requires that we actually multiply
   twice once with addition and the second time with a subtraction.
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   Because of this we need to compute the equations in the order R B
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   then G saving the writes for B in the case of 24/32 bit color
   formats.
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   API: yuv2rgb_kind (uint8_t *Y, uint8_t *U, uint8_t *V, int *out,
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                      int dW, uint32_t *coeffs);
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       A          B
       ---        ---
       i2 = cb    i3 = cr
       i1 = coeff i0 = y
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Where coeffs have the following layout in memory.
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uint32_t oy,oc,zero,cy,crv,rmask,cbu,bmask,cgu,cgv;
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coeffs is a pointer to oy.
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The {rgb} masks are only utilized by the 565 packing algorithm. Note the data
replication is used to simplify the internal algorithms for the dual Mac
architecture of BlackFin.
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All routines are exported with _ff_bfin_ as a symbol prefix.
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Rough performance gain compared against -O3:
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2779809/1484290 187.28%
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which translates to ~33c/pel to ~57c/pel for the reference vs 17.5
c/pel for the optimized implementations. Not sure why there is such a
huge variation on the reference codes on Blackfin I guess it must have
to do with the memory system.
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*/

#define mL3 .text
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#ifdef __FDPIC__
#define mL1 .l1.text
#else
#define mL1 mL3
#endif
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#define MEM mL1

#define DEFUN(fname,where,interface) \
        .section where;              \
        .global _ff_bfin_ ## fname;  \
        .type _ff_bfin_ ## fname, STT_FUNC; \
        .align 8;                    \
        _ff_bfin_ ## fname

#define DEFUN_END(fname) \
        .size _ff_bfin_ ## fname, . - _ff_bfin_ ## fname


.text

#define COEFF_LEN        11*4
#define COEFF_REL_CY_OFF 4*4

#define ARG_OUT   20
#define ARG_W     24
#define ARG_COEFF 28

DEFUN(yuv2rgb565_line,MEM,
   (uint8_t *Y, uint8_t *U, uint8_t *V, int *out, int dW, uint32_t *coeffs)):
        link 0;
        [--sp] = (r7:4);
        p1 = [fp+ARG_OUT];
        r3 = [fp+ARG_W];

        i0 = r0;
        i2 = r1;
        i3 = r2;

        r0 = [fp+ARG_COEFF];
        i1 = r0;
        b1 = i1;
        l1 = COEFF_LEN;
        m0 = COEFF_REL_CY_OFF;
        p0 = r3;

        r0   = [i0++];         // 2Y
        r1.l = w[i2++];        // 2u
        r1.h = w[i3++];        // 2v
        p0 = p0>>2;

        lsetup (.L0565, .L1565) lc0 = p0;

        /*
           uint32_t oy,oc,zero,cy,crv,rmask,cbu,bmask,cgu,cgv
           r0 -- used to load 4ys
           r1 -- used to load 2us,2vs
           r4 -- y3,y2
           r5 -- y1,y0
           r6 -- u1,u0
           r7 -- v1,v0
        */
                                                              r2=[i1++]; // oy
.L0565:
        /*
        rrrrrrrr gggggggg bbbbbbbb
         5432109876543210
                    bbbbb >>3
              gggggggg    <<3
         rrrrrrrr         <<8
         rrrrrggggggbbbbb
        */
        (r4,r5) = byteop16m (r1:0, r3:2)                   || r3=[i1++]; // oc
        (r7,r6) = byteop16m (r1:0, r3:2) (r);
        r5 = r5 << 2 (v);                                                // y1,y0
        r4 = r4 << 2 (v);                                                // y3,y2
        r6 = r6 << 2 (v)                                   || r0=[i1++]; // u1,u0, r0=zero
        r7 = r7 << 2 (v)                                   || r1=[i1++]; // v1,v0  r1=cy
        /* Y' = y*cy */
        a1 = r1.h*r5.h, a0 = r1.l*r5.l                     || r1=[i1++]; // crv

        /* R = Y+ crv*(Cr-128) */
        r2.h = (a1 += r1.h*r7.l), r2.l = (a0 += r1.l*r7.l);
                a1 -= r1.h*r7.l,          a0 -= r1.l*r7.l  || r5=[i1++]; // rmask
        r2 = byteop3p(r3:2, r1:0)(LO)                      || r1=[i1++]; // cbu
        r2 = r2 >> 3 (v);
        r3 = r2 & r5;

        /* B = Y+ cbu*(Cb-128) */
        r2.h = (a1 += r1.h*r6.l), r2.l = (a0 += r1.l*r6.l);
                a1 -= r1.h*r6.l,          a0 -= r1.l*r6.l  || r5=[i1++]; // bmask
        r2 = byteop3p(r3:2, r1:0)(LO)                      || r1=[i1++]; // cgu
        r2 = r2 << 8 (v);
        r2 = r2 & r5;
        r3 = r3 | r2;

        /* G = Y+ cgu*(Cb-128)+cgv*(Cr-128) */
                a1 += r1.h*r6.l,          a0 += r1.l*r6.l  || r1=[i1++]; // cgv
        r2.h = (a1 += r1.h*r7.l), r2.l = (a0 += r1.l*r7.l);
        r2 = byteop3p(r3:2, r1:0)(LO)                      || r5=[i1++m0]; // gmask
        r2 = r2 << 3 (v);
        r2 = r2 & r5;
        r3 = r3 | r2;
        [p1++]=r3                                          || r1=[i1++]; // cy

        /* Y' = y*cy */

        a1 = r1.h*r4.h, a0 = r1.l*r4.l                     || r1=[i1++]; // crv

        /* R = Y+ crv*(Cr-128) */
        r2.h = (a1 += r1.h*r7.h), r2.l = (a0 += r1.l*r7.h);
                a1 -= r1.h*r7.h,          a0 -= r1.l*r7.h  || r5=[i1++]; // rmask
        r2 = byteop3p(r3:2, r1:0)(LO)                      || r1=[i1++]; // cbu
        r2 = r2 >> 3 (v);
        r3 = r2 & r5;

        /* B = Y+ cbu*(Cb-128) */
        r2.h = (a1 += r1.h*r6.h), r2.l = (a0 += r1.l*r6.h);
                a1 -= r1.h*r6.h,          a0 -= r1.l*r6.h  || r5=[i1++]; // bmask
        r2 = byteop3p(r3:2, r1:0)(LO)                      || r1=[i1++]; // cgu
        r2 = r2 << 8 (v);
        r2 = r2 & r5;
        r3 = r3 | r2;

        /* G = Y+ cgu*(Cb-128)+cgv*(Cr-128) */
                a1 += r1.h*r6.h,          a0 += r1.l*r6.h  || r1=[i1++]; // cgv
        r2.h = (a1 += r1.h*r7.h), r2.l = (a0 += r1.l*r7.h) || r5=[i1++]; // gmask
        r2 = byteop3p(r3:2, r1:0)(LO)                      || r0   =  [i0++];        // 2Y
        r2 = r2 << 3 (v)                                   || r1.l = w[i2++];        // 2u
        r2 = r2 & r5;
        r3 = r3 | r2;
        [p1++]=r3                                          || r1.h = w[i3++];        // 2v
.L1565:                                                       r2=[i1++]; // oy

        l1 = 0;

        (r7:4) = [sp++];
        unlink;
        rts;
DEFUN_END(yuv2rgb565_line)

DEFUN(yuv2rgb555_line,MEM,
   (uint8_t *Y, uint8_t *U, uint8_t *V, int *out, int dW, uint32_t *coeffs)):
        link 0;
        [--sp] = (r7:4);
        p1 = [fp+ARG_OUT];
        r3 = [fp+ARG_W];

        i0 = r0;
        i2 = r1;
        i3 = r2;

        r0 = [fp+ARG_COEFF];
        i1 = r0;
        b1 = i1;
        l1 = COEFF_LEN;
        m0 = COEFF_REL_CY_OFF;
        p0 = r3;

        r0   = [i0++];         // 2Y
        r1.l = w[i2++];        // 2u
        r1.h = w[i3++];        // 2v
        p0 = p0>>2;

        lsetup (.L0555, .L1555) lc0 = p0;

        /*
           uint32_t oy,oc,zero,cy,crv,rmask,cbu,bmask,cgu,cgv
           r0 -- used to load 4ys
           r1 -- used to load 2us,2vs
           r4 -- y3,y2
           r5 -- y1,y0
           r6 -- u1,u0
           r7 -- v1,v0
        */
                                                              r2=[i1++]; // oy
.L0555:
        /*
        rrrrrrrr gggggggg bbbbbbbb
         5432109876543210
                    bbbbb >>3
               gggggggg   <<2
          rrrrrrrr        <<7
         xrrrrrgggggbbbbb
        */

        (r4,r5) = byteop16m (r1:0, r3:2)                   || r3=[i1++]; // oc
        (r7,r6) = byteop16m (r1:0, r3:2) (r);
        r5 = r5 << 2 (v);                                                // y1,y0
        r4 = r4 << 2 (v);                                                // y3,y2
        r6 = r6 << 2 (v)                                   || r0=[i1++]; // u1,u0, r0=zero
        r7 = r7 << 2 (v)                                   || r1=[i1++]; // v1,v0  r1=cy
        /* Y' = y*cy */
        a1 = r1.h*r5.h, a0 = r1.l*r5.l                     || r1=[i1++]; // crv

        /* R = Y+ crv*(Cr-128) */
        r2.h = (a1 += r1.h*r7.l), r2.l = (a0 += r1.l*r7.l);
                a1 -= r1.h*r7.l,          a0 -= r1.l*r7.l  || r5=[i1++]; // rmask
        r2 = byteop3p(r3:2, r1:0)(LO)                      || r1=[i1++]; // cbu
        r2 = r2 >> 3 (v);
        r3 = r2 & r5;

        /* B = Y+ cbu*(Cb-128) */
        r2.h = (a1 += r1.h*r6.l), r2.l = (a0 += r1.l*r6.l);
                a1 -= r1.h*r6.l,          a0 -= r1.l*r6.l  || r5=[i1++]; // bmask
        r2 = byteop3p(r3:2, r1:0)(LO)                      || r1=[i1++]; // cgu
        r2 = r2 << 7 (v);
        r2 = r2 & r5;
        r3 = r3 | r2;

        /* G = Y+ cgu*(Cb-128)+cgv*(Cr-128) */
                a1 += r1.h*r6.l,          a0 += r1.l*r6.l  || r1=[i1++]; // cgv
        r2.h = (a1 += r1.h*r7.l), r2.l = (a0 += r1.l*r7.l);
        r2 = byteop3p(r3:2, r1:0)(LO)                      || r5=[i1++m0]; // gmask
        r2 = r2 << 2 (v);
        r2 = r2 & r5;
        r3 = r3 | r2;
        [p1++]=r3                                          || r1=[i1++]; // cy

        /* Y' = y*cy */

        a1 = r1.h*r4.h, a0 = r1.l*r4.l                     || r1=[i1++]; // crv

        /* R = Y+ crv*(Cr-128) */
        r2.h = (a1 += r1.h*r7.h), r2.l = (a0 += r1.l*r7.h);
                a1 -= r1.h*r7.h,          a0 -= r1.l*r7.h  || r5=[i1++]; // rmask
        r2 = byteop3p(r3:2, r1:0)(LO)                      || r1=[i1++]; // cbu
        r2 = r2 >> 3 (v);
        r3 = r2 & r5;

        /* B = Y+ cbu*(Cb-128) */
        r2.h = (a1 += r1.h*r6.h), r2.l = (a0 += r1.l*r6.h);
                a1 -= r1.h*r6.h,          a0 -= r1.l*r6.h  || r5=[i1++]; // bmask
        r2 = byteop3p(r3:2, r1:0)(LO)                      || r1=[i1++]; // cgu
        r2 = r2 << 7 (v);
        r2 = r2 & r5;
        r3 = r3 | r2;

        /* G = Y+ cgu*(Cb-128)+cgv*(Cr-128) */
                a1 += r1.h*r6.h,          a0 += r1.l*r6.h  || r1=[i1++]; // cgv
        r2.h = (a1 += r1.h*r7.h), r2.l = (a0 += r1.l*r7.h) || r5=[i1++]; // gmask
        r2 = byteop3p(r3:2, r1:0)(LO)                      || r0=[i0++];     // 4Y
        r2 = r2 << 2 (v)                                   || r1.l=w[i2++];  // 2u
        r2 = r2 & r5;
        r3 = r3 | r2;
        [p1++]=r3                                          || r1.h=w[i3++]; // 2v

.L1555:                                                       r2=[i1++]; // oy

        l1 = 0;

        (r7:4) = [sp++];
        unlink;
        rts;
DEFUN_END(yuv2rgb555_line)

DEFUN(yuv2rgb24_line,MEM,
   (uint8_t *Y, uint8_t *U, uint8_t *V, int *out, int dW, uint32_t *coeffs)):
        link 0;
        [--sp] = (r7:4);
        p1 = [fp+ARG_OUT];
        r3 = [fp+ARG_W];
        p2 = p1;
        p2 += 3;

        i0 = r0;
        i2 = r1;
        i3 = r2;

        r0 = [fp+ARG_COEFF]; // coeff buffer
        i1 = r0;
        b1 = i1;
        l1 = COEFF_LEN;
        m0 = COEFF_REL_CY_OFF;
        p0 = r3;

        r0   = [i0++];         // 2Y
        r1.l = w[i2++];        // 2u
        r1.h = w[i3++];        // 2v
        p0 = p0>>2;

        lsetup (.L0888, .L1888) lc0 = p0;

        /*
           uint32_t oy,oc,zero,cy,crv,rmask,cbu,bmask,cgu,cgv
           r0 -- used to load 4ys
           r1 -- used to load 2us,2vs
           r4 -- y3,y2
           r5 -- y1,y0
           r6 -- u1,u0
           r7 -- v1,v0
        */
                                                              r2=[i1++]; // oy
.L0888:
        (r4,r5) = byteop16m (r1:0, r3:2)                   || r3=[i1++]; // oc
        (r7,r6) = byteop16m (r1:0, r3:2) (r);
        r5 = r5 << 2 (v);               // y1,y0
        r4 = r4 << 2 (v);               // y3,y2
        r6 = r6 << 2 (v) || r0=[i1++];  // u1,u0, r0=zero
        r7 = r7 << 2 (v) || r1=[i1++];  // v1,v0  r1=cy

        /* Y' = y*cy */
        a1 = r1.h*r5.h, a0 = r1.l*r5.l                     || r1=[i1++]; // crv

        /* R = Y+ crv*(Cr-128) */
        r2.h = (a1 += r1.h*r7.l), r2.l = (a0 += r1.l*r7.l);
                a1 -= r1.h*r7.l,          a0 -= r1.l*r7.l  || r5=[i1++]; // rmask
        r2 = byteop3p(r3:2, r1:0)(LO)                      || r1=[i1++]; // cbu
        r2=r2>>16 || B[p1++]=r2;
                     B[p2++]=r2;

        /* B = Y+ cbu*(Cb-128) */
        r2.h = (a1 += r1.h*r6.l), r2.l = (a0 += r1.l*r6.l);
                a1 -= r1.h*r6.l,          a0 -= r1.l*r6.l  || r5=[i1++]; // bmask
        r3 = byteop3p(r3:2, r1:0)(LO)                      || r1=[i1++]; // cgu

        /* G = Y+ cgu*(Cb-128)+cgv*(Cr-128) */
                a1 += r1.h*r6.l,          a0 += r1.l*r6.l  || r1=[i1++]; // cgv
        r2.h = (a1 += r1.h*r7.l), r2.l = (a0 += r1.l*r7.l);
        r2 = byteop3p(r3:2, r1:0)(LO)                      || r5=[i1++m0]; // gmask, oy,cy,zero

        r2=r2>>16 || B[p1++]=r2;
                     B[p2++]=r2;

        r3=r3>>16 || B[p1++]=r3;
                     B[p2++]=r3                            || r1=[i1++]; // cy

        p1+=3;
        p2+=3;
        /* Y' = y*cy */
        a1 = r1.h*r4.h, a0 = r1.l*r4.l                     || r1=[i1++]; // crv

        /* R = Y+ crv*(Cr-128) */
        r2.h = (a1 += r1.h*r7.h), r2.l = (a0 += r1.l*r7.h);
                a1 -= r1.h*r7.h,          a0 -= r1.l*r7.h  || r5=[i1++]; // rmask
        r2 = byteop3p(r3:2, r1:0)(LO)                      || r1=[i1++]; // cbu
        r2=r2>>16 || B[p1++]=r2;
        B[p2++]=r2;

        /* B = Y+ cbu*(Cb-128) */
        r2.h = (a1 += r1.h*r6.h), r2.l = (a0 += r1.l*r6.h);
                a1 -= r1.h*r6.h,          a0 -= r1.l*r6.h  || r5=[i1++]; // bmask
        r3 = byteop3p(r3:2, r1:0)(LO)                      || r1=[i1++]; // cgu

        /* G = Y+ cgu*(Cb-128)+cgv*(Cr-128) */
                a1 += r1.h*r6.h,          a0 += r1.l*r6.h  || r1=[i1++]; // cgv
        r2.h = (a1 += r1.h*r7.h), r2.l = (a0 += r1.l*r7.h);
        r2 = byteop3p(r3:2, r1:0)(LO)                      || r5=[i1++]; // gmask
        r2=r2>>16 || B[p1++]=r2 || r0 = [i0++];    // 4y
                     B[p2++]=r2 || r1.l = w[i2++]; // 2u
        r3=r3>>16 || B[p1++]=r3 || r1.h = w[i3++]; // 2v
                     B[p2++]=r3 || r2=[i1++];      // oy

        p1+=3;
.L1888: p2+=3;

        l1 = 0;

        (r7:4) = [sp++];
        unlink;
        rts;
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DEFUN_END(yuv2rgb24_line)
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#define ARG_vdst        20
#define ARG_width       24
#define ARG_height      28
#define ARG_lumStride   32
#define ARG_chromStride 36
#define ARG_srcStride   40

DEFUN(uyvytoyv12, mL3,  (const uint8_t *src, uint8_t *ydst, uint8_t *udst, uint8_t *vdst,
                         long width, long height,
                         long lumStride, long chromStride, long srcStride)):
        link 0;
        [--sp] = (r7:4,p5:4);

        p0 = r1;       // Y top even

        i2 = r2; // *u
        r2 = [fp + ARG_vdst];
        i3 = r2; // *v

        r1 = [fp + ARG_srcStride];
        r2 = r0 + r1;
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        r1 += -8;  // i0,i1 is pre read need to correct
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        m0 = r1;

        i0 = r0;  // uyvy_T even
        i1 = r2;  // uyvy_B odd

        p2 = [fp + ARG_lumStride];
        p1 = p0 + p2;  // Y bot odd

        p5 = [fp + ARG_width];
        p4 = [fp + ARG_height];
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        r0 = p5;
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        p4 = p4 >> 1;
        p5 = p5 >> 2;

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        r2 = [fp + ARG_chromStride];
        r0 = r0 >> 1;
        r2 = r2 - r0;
        m1 = r2;

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        /*   I0,I1 - src input line pointers
         *   p0,p1 - luma output line pointers
         *   I2    - dstU
         *   I3    - dstV
         */

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        lsetup (0f, 1f) lc1 = p4;   // H/2
0:        r0 = [i0++] || r2 = [i1++];
          r1 = [i0++] || r3 = [i1++];
          r4 = byteop1p(r1:0, r3:2);
          r5 = byteop1p(r1:0, r3:2) (r);
          lsetup (2f, 3f) lc0 = p5; // W/4
2:          r0 = r0 >> 8(v);
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            r1 = r1 >> 8(v);
            r2 = r2 >> 8(v);
            r3 = r3 >> 8(v);
            r0 = bytepack(r0, r1);
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            r2 = bytepack(r2, r3)         ||  [p0++] = r0;    // yyyy
            r6 = pack(r5.l, r4.l)         ||  [p1++] = r2;    // yyyy
            r7 = pack(r5.h, r4.h)         ||  r0 = [i0++] || r2 = [i1++];
            r6 = bytepack(r6, r7)         ||  r1 = [i0++] || r3 = [i1++];
            r4 = byteop1p(r1:0, r3:2)     ||  w[i2++] = r6.l; // uu
3:          r5 = byteop1p(r1:0, r3:2) (r) ||  w[i3++] = r6.h; // vv
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          i0 += m0;
          i1 += m0;
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          i2 += m1;
          i3 += m1;
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          p0 = p0 + p2;
1:        p1 = p1 + p2;

        (r7:4,p5:4) = [sp++];
        unlink;
        rts;
DEFUN_END(uyvytoyv12)
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DEFUN(yuyvtoyv12, mL3,  (const uint8_t *src, uint8_t *ydst, uint8_t *udst, uint8_t *vdst,
                         long width, long height,
                         long lumStride, long chromStride, long srcStride)):
        link 0;
        [--sp] = (r7:4,p5:4);

        p0 = r1;       // Y top even

        i2 = r2; // *u
        r2 = [fp + ARG_vdst];
        i3 = r2; // *v

        r1 = [fp + ARG_srcStride];
        r2 = r0 + r1;
        r1 += -8;  // i0,i1 is pre read need to correct
        m0 = r1;

        i0 = r0;  // uyvy_T even
        i1 = r2;  // uyvy_B odd

        p2 = [fp + ARG_lumStride];
        p1 = p0 + p2;  // Y bot odd

        p5 = [fp + ARG_width];
        p4 = [fp + ARG_height];
        r0 = p5;
        p4 = p4 >> 1;
        p5 = p5 >> 2;

        r2 = [fp + ARG_chromStride];
        r0 = r0 >> 1;
        r2 = r2 - r0;
        m1 = r2;

        /*   I0,I1 - src input line pointers
         *   p0,p1 - luma output line pointers
         *   I2    - dstU
         *   I3    - dstV
         */

        lsetup (0f, 1f) lc1 = p4;   // H/2
0:        r0 = [i0++] || r2 = [i1++];
          r1 = [i0++] || r3 = [i1++];
          r4 = bytepack(r0, r1);
          r5 = bytepack(r2, r3);
          lsetup (2f, 3f) lc0 = p5; // W/4
2:          r0 = r0 >> 8(v) || [p0++] = r4;  // yyyy-even
            r1 = r1 >> 8(v) || [p1++] = r5;  // yyyy-odd
            r2 = r2 >> 8(v);
            r3 = r3 >> 8(v);
            r4 = byteop1p(r1:0, r3:2);
            r5 = byteop1p(r1:0, r3:2) (r);
            r6 = pack(r5.l, r4.l);
            r7 = pack(r5.h, r4.h)         ||  r0 = [i0++] || r2 = [i1++];
            r6 = bytepack(r6, r7)         ||  r1 = [i0++] || r3 = [i1++];
            r4 = bytepack(r0, r1)         ||  w[i2++] = r6.l; // uu
3:          r5 = bytepack(r2, r3)         ||  w[i3++] = r6.h; // vv

          i0 += m0;
          i1 += m0;
          i2 += m1;
          i3 += m1;
          p0 = p0 + p2;
1:        p1 = p1 + p2;

        (r7:4,p5:4) = [sp++];
        unlink;
        rts;
DEFUN_END(yuyvtoyv12)