PeerStreamer

/*

 * Copyright (c) 2002 Brian Foley

 * Copyright (c) 2002 Dieter Shirley

 * Copyright (c) 2003-2004 Romain Dolbeau <romain@dolbeau.org>

 *

 * 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

 */

#include "dsputil.h"

#include "gcc_fixes.h"

#include "dsputil_altivec.h"

#ifdef CONFIG_DARWIN

#include <sys/sysctl.h>

#else /* CONFIG_DARWIN */

#ifdef __AMIGAOS4__

#include <exec/exec.h>

#include <interfaces/exec.h>

#include <proto/exec.h>

#else /* __AMIGAOS4__ */

#include <signal.h>

#include <setjmp.h>

static sigjmp_buf jmpbuf;

static volatile sig_atomic_t canjump = 0;

static void sigill_handler (int sig)

{

    if (!canjump) {

        signal (sig, SIG_DFL);

        raise (sig);

    }

    canjump = 0;

    siglongjmp (jmpbuf, 1);

}

#endif /* CONFIG_DARWIN */

#endif /* __AMIGAOS4__ */

int sad16_x2_altivec(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)

{

    int i;

    int s __attribute__((aligned(16)));

    const_vector unsigned char zero = (const_vector unsigned char)vec_splat_u8(0);

    vector unsigned char *tv;

    vector unsigned char pix1v, pix2v, pix2iv, avgv, t5;

    vector unsigned int sad;

    vector signed int sumdiffs;

    s = 0;

    sad = (vector unsigned int)vec_splat_u32(0);

    for(i=0;i<h;i++) {

        /*

           Read unaligned pixels into our vectors. The vectors are as follows:

           pix1v: pix1[0]-pix1[15]

           pix2v: pix2[0]-pix2[15]      pix2iv: pix2[1]-pix2[16]

        */

        tv = (vector unsigned char *) pix1;

        pix1v = vec_perm(tv[0], tv[1], vec_lvsl(0, pix1));

        tv = (vector unsigned char *) &pix2[0];

        pix2v = vec_perm(tv[0], tv[1], vec_lvsl(0, &pix2[0]));

        tv = (vector unsigned char *) &pix2[1];

        pix2iv = vec_perm(tv[0], tv[1], vec_lvsl(0, &pix2[1]));

        /* Calculate the average vector */

        avgv = vec_avg(pix2v, pix2iv);

        /* Calculate a sum of abs differences vector */

        t5 = vec_sub(vec_max(pix1v, avgv), vec_min(pix1v, avgv));

        /* Add each 4 pixel group together and put 4 results into sad */

        sad = vec_sum4s(t5, sad);

        pix1 += line_size;

        pix2 += line_size;

    }

    /* Sum up the four partial sums, and put the result into s */

    sumdiffs = vec_sums((vector signed int) sad, (vector signed int) zero);

    sumdiffs = vec_splat(sumdiffs, 3);

    vec_ste(sumdiffs, 0, &s);

    return s;

}

int sad16_y2_altivec(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)

{

    int i;

    int s __attribute__((aligned(16)));

    const_vector unsigned char zero = (const_vector unsigned char)vec_splat_u8(0);

    vector unsigned char *tv;

    vector unsigned char pix1v, pix2v, pix3v, avgv, t5;

    vector unsigned int sad;

    vector signed int sumdiffs;

    uint8_t *pix3 = pix2 + line_size;

    s = 0;

    sad = (vector unsigned int)vec_splat_u32(0);

    /*

       Due to the fact that pix3 = pix2 + line_size, the pix3 of one

       iteration becomes pix2 in the next iteration. We can use this

       fact to avoid a potentially expensive unaligned read, each

       time around the loop.

       Read unaligned pixels into our vectors. The vectors are as follows:

       pix2v: pix2[0]-pix2[15]

       Split the pixel vectors into shorts

    */

    tv = (vector unsigned char *) &pix2[0];

    pix2v = vec_perm(tv[0], tv[1], vec_lvsl(0, &pix2[0]));

    for(i=0;i<h;i++) {

        /*

           Read unaligned pixels into our vectors. The vectors are as follows:

           pix1v: pix1[0]-pix1[15]

           pix3v: pix3[0]-pix3[15]

        */

        tv = (vector unsigned char *) pix1;

        pix1v = vec_perm(tv[0], tv[1], vec_lvsl(0, pix1));

        tv = (vector unsigned char *) &pix3[0];

        pix3v = vec_perm(tv[0], tv[1], vec_lvsl(0, &pix3[0]));

        /* Calculate the average vector */

        avgv = vec_avg(pix2v, pix3v);

        /* Calculate a sum of abs differences vector */

        t5 = vec_sub(vec_max(pix1v, avgv), vec_min(pix1v, avgv));

        /* Add each 4 pixel group together and put 4 results into sad */

        sad = vec_sum4s(t5, sad);

        pix1 += line_size;

        pix2v = pix3v;

        pix3 += line_size;

    }

    /* Sum up the four partial sums, and put the result into s */

    sumdiffs = vec_sums((vector signed int) sad, (vector signed int) zero);

    sumdiffs = vec_splat(sumdiffs, 3);

    vec_ste(sumdiffs, 0, &s);

    return s;

}

int sad16_xy2_altivec(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)

{

    int i;

    int s __attribute__((aligned(16)));

    uint8_t *pix3 = pix2 + line_size;

    const_vector unsigned char zero = (const_vector unsigned char)vec_splat_u8(0);

    const_vector unsigned short two = (const_vector unsigned short)vec_splat_u16(2);

    vector unsigned char *tv, avgv, t5;

    vector unsigned char pix1v, pix2v, pix3v, pix2iv, pix3iv;

    vector unsigned short pix2lv, pix2hv, pix2ilv, pix2ihv;

    vector unsigned short pix3lv, pix3hv, pix3ilv, pix3ihv;

    vector unsigned short avghv, avglv;

    vector unsigned short t1, t2, t3, t4;

    vector unsigned int sad;

    vector signed int sumdiffs;

    sad = (vector unsigned int)vec_splat_u32(0);

    s = 0;

    /*

       Due to the fact that pix3 = pix2 + line_size, the pix3 of one

       iteration becomes pix2 in the next iteration. We can use this

       fact to avoid a potentially expensive unaligned read, as well

       as some splitting, and vector addition each time around the loop.

       Read unaligned pixels into our vectors. The vectors are as follows:

       pix2v: pix2[0]-pix2[15]  pix2iv: pix2[1]-pix2[16]

       Split the pixel vectors into shorts

    */

    tv = (vector unsigned char *) &pix2[0];

    pix2v = vec_perm(tv[0], tv[1], vec_lvsl(0, &pix2[0]));

    tv = (vector unsigned char *) &pix2[1];

    pix2iv = vec_perm(tv[0], tv[1], vec_lvsl(0, &pix2[1]));

    pix2hv = (vector unsigned short) vec_mergeh(zero, pix2v);

    pix2lv = (vector unsigned short) vec_mergel(zero, pix2v);

    pix2ihv = (vector unsigned short) vec_mergeh(zero, pix2iv);

    pix2ilv = (vector unsigned short) vec_mergel(zero, pix2iv);

    t1 = vec_add(pix2hv, pix2ihv);

    t2 = vec_add(pix2lv, pix2ilv);

    for(i=0;i<h;i++) {

        /*

           Read unaligned pixels into our vectors. The vectors are as follows:

           pix1v: pix1[0]-pix1[15]

           pix3v: pix3[0]-pix3[15]      pix3iv: pix3[1]-pix3[16]

        */

        tv = (vector unsigned char *) pix1;

        pix1v = vec_perm(tv[0], tv[1], vec_lvsl(0, pix1));

        tv = (vector unsigned char *) &pix3[0];

        pix3v = vec_perm(tv[0], tv[1], vec_lvsl(0, &pix3[0]));

        tv = (vector unsigned char *) &pix3[1];

        pix3iv = vec_perm(tv[0], tv[1], vec_lvsl(0, &pix3[1]));

        /*

          Note that Altivec does have vec_avg, but this works on vector pairs

          and rounds up. We could do avg(avg(a,b),avg(c,d)), but the rounding

          would mean that, for example, avg(3,0,0,1) = 2, when it should be 1.

          Instead, we have to split the pixel vectors into vectors of shorts,

          and do the averaging by hand.

        */

        /* Split the pixel vectors into shorts */

        pix3hv = (vector unsigned short) vec_mergeh(zero, pix3v);

        pix3lv = (vector unsigned short) vec_mergel(zero, pix3v);

        pix3ihv = (vector unsigned short) vec_mergeh(zero, pix3iv);

        pix3ilv = (vector unsigned short) vec_mergel(zero, pix3iv);

        /* Do the averaging on them */

        t3 = vec_add(pix3hv, pix3ihv);

        t4 = vec_add(pix3lv, pix3ilv);

        avghv = vec_sr(vec_add(vec_add(t1, t3), two), two);

        avglv = vec_sr(vec_add(vec_add(t2, t4), two), two);

        /* Pack the shorts back into a result */

        avgv = vec_pack(avghv, avglv);

        /* Calculate a sum of abs differences vector */

        t5 = vec_sub(vec_max(pix1v, avgv), vec_min(pix1v, avgv));

        /* Add each 4 pixel group together and put 4 results into sad */

        sad = vec_sum4s(t5, sad);

        pix1 += line_size;

        pix3 += line_size;

        /* Transfer the calculated values for pix3 into pix2 */

        t1 = t3;

        t2 = t4;

    }

    /* Sum up the four partial sums, and put the result into s */

    sumdiffs = vec_sums((vector signed int) sad, (vector signed int) zero);

    sumdiffs = vec_splat(sumdiffs, 3);

    vec_ste(sumdiffs, 0, &s);

    return s;

}

int sad16_altivec(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)

{

    int i;

    int s __attribute__((aligned(16)));

    const_vector unsigned int zero = (const_vector unsigned int)vec_splat_u32(0);

    vector unsigned char perm1, perm2, *pix1v, *pix2v;

    vector unsigned char t1, t2, t3,t4, t5;

    vector unsigned int sad;

    vector signed int sumdiffs;

    sad = (vector unsigned int)vec_splat_u32(0);

    for(i=0;i<h;i++) {

        /* Read potentially unaligned pixels into t1 and t2 */

        perm1 = vec_lvsl(0, pix1);

        pix1v = (vector unsigned char *) pix1;

        perm2 = vec_lvsl(0, pix2);

        pix2v = (vector unsigned char *) pix2;

        t1 = vec_perm(pix1v[0], pix1v[1], perm1);

        t2 = vec_perm(pix2v[0], pix2v[1], perm2);

        /* Calculate a sum of abs differences vector */

        t3 = vec_max(t1, t2);

        t4 = vec_min(t1, t2);

        t5 = vec_sub(t3, t4);

        /* Add each 4 pixel group together and put 4 results into sad */

        sad = vec_sum4s(t5, sad);

        pix1 += line_size;

        pix2 += line_size;

    }

    /* Sum up the four partial sums, and put the result into s */

    sumdiffs = vec_sums((vector signed int) sad, (vector signed int) zero);

    sumdiffs = vec_splat(sumdiffs, 3);

    vec_ste(sumdiffs, 0, &s);

    return s;

}

int sad8_altivec(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)

{

    int i;

    int s __attribute__((aligned(16)));

    const_vector unsigned int zero = (const_vector unsigned int)vec_splat_u32(0);

    vector unsigned char perm1, perm2, permclear, *pix1v, *pix2v;

    vector unsigned char t1, t2, t3,t4, t5;

    vector unsigned int sad;

    vector signed int sumdiffs;

    sad = (vector unsigned int)vec_splat_u32(0);

    permclear = (vector unsigned char)AVV(255,255,255,255,255,255,255,255,0,0,0,0,0,0,0,0);

    for(i=0;i<h;i++) {

        /* Read potentially unaligned pixels into t1 and t2

           Since we're reading 16 pixels, and actually only want 8,

           mask out the last 8 pixels. The 0s don't change the sum. */

        perm1 = vec_lvsl(0, pix1);

        pix1v = (vector unsigned char *) pix1;

        perm2 = vec_lvsl(0, pix2);

        pix2v = (vector unsigned char *) pix2;

        t1 = vec_and(vec_perm(pix1v[0], pix1v[1], perm1), permclear);

        t2 = vec_and(vec_perm(pix2v[0], pix2v[1], perm2), permclear);

        /* Calculate a sum of abs differences vector */

        t3 = vec_max(t1, t2);

        t4 = vec_min(t1, t2);

        t5 = vec_sub(t3, t4);

        /* Add each 4 pixel group together and put 4 results into sad */

        sad = vec_sum4s(t5, sad);

        pix1 += line_size;

        pix2 += line_size;

    }

    /* Sum up the four partial sums, and put the result into s */

    sumdiffs = vec_sums((vector signed int) sad, (vector signed int) zero);

    sumdiffs = vec_splat(sumdiffs, 3);

    vec_ste(sumdiffs, 0, &s);

    return s;

}

int pix_norm1_altivec(uint8_t *pix, int line_size)

{

    int i;

    int s __attribute__((aligned(16)));

    const_vector unsigned int zero = (const_vector unsigned int)vec_splat_u32(0);

    vector unsigned char *tv;

    vector unsigned char pixv;

    vector unsigned int sv;

    vector signed int sum;

    sv = (vector unsigned int)vec_splat_u32(0);

    s = 0;

    for (i = 0; i < 16; i++) {

        /* Read in the potentially unaligned pixels */

        tv = (vector unsigned char *) pix;

        pixv = vec_perm(tv[0], tv[1], vec_lvsl(0, pix));

        /* Square the values, and add them to our sum */

        sv = vec_msum(pixv, pixv, sv);

        pix += line_size;

    }

    /* Sum up the four partial sums, and put the result into s */

    sum = vec_sums((vector signed int) sv, (vector signed int) zero);

    sum = vec_splat(sum, 3);

    vec_ste(sum, 0, &s);

    return s;

}

/**

 * Sum of Squared Errors for a 8x8 block.

 * AltiVec-enhanced.

 * It's the sad8_altivec code above w/ squaring added.

 */

int sse8_altivec(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)

{

    int i;

    int s __attribute__((aligned(16)));

    const_vector unsigned int zero = (const_vector unsigned int)vec_splat_u32(0);

    vector unsigned char perm1, perm2, permclear, *pix1v, *pix2v;

    vector unsigned char t1, t2, t3,t4, t5;

    vector unsigned int sum;

    vector signed int sumsqr;

    sum = (vector unsigned int)vec_splat_u32(0);

    permclear = (vector unsigned char)AVV(255,255,255,255,255,255,255,255,0,0,0,0,0,0,0,0);

    for(i=0;i<h;i++) {

        /* Read potentially unaligned pixels into t1 and t2

           Since we're reading 16 pixels, and actually only want 8,

           mask out the last 8 pixels. The 0s don't change the sum. */

        perm1 = vec_lvsl(0, pix1);

        pix1v = (vector unsigned char *) pix1;

        perm2 = vec_lvsl(0, pix2);

        pix2v = (vector unsigned char *) pix2;

        t1 = vec_and(vec_perm(pix1v[0], pix1v[1], perm1), permclear);

        t2 = vec_and(vec_perm(pix2v[0], pix2v[1], perm2), permclear);

        /*

          Since we want to use unsigned chars, we can take advantage

          of the fact that abs(a-b)^2 = (a-b)^2.

        */

        /* Calculate abs differences vector */

        t3 = vec_max(t1, t2);

        t4 = vec_min(t1, t2);

        t5 = vec_sub(t3, t4);

        /* Square the values and add them to our sum */

        sum = vec_msum(t5, t5, sum);

        pix1 += line_size;

        pix2 += line_size;

    }

    /* Sum up the four partial sums, and put the result into s */

    sumsqr = vec_sums((vector signed int) sum, (vector signed int) zero);

    sumsqr = vec_splat(sumsqr, 3);

    vec_ste(sumsqr, 0, &s);

    return s;

}

/**

 * Sum of Squared Errors for a 16x16 block.

 * AltiVec-enhanced.

 * It's the sad16_altivec code above w/ squaring added.

 */

int sse16_altivec(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)

{

    int i;

    int s __attribute__((aligned(16)));

    const_vector unsigned int zero = (const_vector unsigned int)vec_splat_u32(0);

    vector unsigned char perm1, perm2, *pix1v, *pix2v;

    vector unsigned char t1, t2, t3,t4, t5;

    vector unsigned int sum;

    vector signed int sumsqr;

    sum = (vector unsigned int)vec_splat_u32(0);

    for(i=0;i<h;i++) {

        /* Read potentially unaligned pixels into t1 and t2 */

        perm1 = vec_lvsl(0, pix1);

        pix1v = (vector unsigned char *) pix1;

        perm2 = vec_lvsl(0, pix2);

        pix2v = (vector unsigned char *) pix2;

        t1 = vec_perm(pix1v[0], pix1v[1], perm1);

        t2 = vec_perm(pix2v[0], pix2v[1], perm2);

        /*

          Since we want to use unsigned chars, we can take advantage

          of the fact that abs(a-b)^2 = (a-b)^2.

        */

        /* Calculate abs differences vector */

        t3 = vec_max(t1, t2);

        t4 = vec_min(t1, t2);

        t5 = vec_sub(t3, t4);

        /* Square the values and add them to our sum */

        sum = vec_msum(t5, t5, sum);

        pix1 += line_size;

        pix2 += line_size;

    }

    /* Sum up the four partial sums, and put the result into s */

    sumsqr = vec_sums((vector signed int) sum, (vector signed int) zero);

    sumsqr = vec_splat(sumsqr, 3);

    vec_ste(sumsqr, 0, &s);

    return s;

}

int pix_sum_altivec(uint8_t * pix, int line_size)

{

    const_vector unsigned int zero = (const_vector unsigned int)vec_splat_u32(0);

    vector unsigned char perm, *pixv;

    vector unsigned char t1;

    vector unsigned int sad;

    vector signed int sumdiffs;

    int i;

    int s __attribute__((aligned(16)));

    sad = (vector unsigned int)vec_splat_u32(0);

    for (i = 0; i < 16; i++) {

        /* Read the potentially unaligned 16 pixels into t1 */

        perm = vec_lvsl(0, pix);

        pixv = (vector unsigned char *) pix;

        t1 = vec_perm(pixv[0], pixv[1], perm);

        /* Add each 4 pixel group together and put 4 results into sad */

        sad = vec_sum4s(t1, sad);

        pix += line_size;

    }

    /* Sum up the four partial sums, and put the result into s */

    sumdiffs = vec_sums((vector signed int) sad, (vector signed int) zero);

    sumdiffs = vec_splat(sumdiffs, 3);

    vec_ste(sumdiffs, 0, &s);

    return s;

}

void get_pixels_altivec(DCTELEM *restrict block, const uint8_t *pixels, int line_size)

{

    int i;

    vector unsigned char perm, bytes, *pixv;

    const_vector unsigned char zero = (const_vector unsigned char)vec_splat_u8(0);

    vector signed short shorts;

    for(i=0;i<8;i++)

    {

        // Read potentially unaligned pixels.

        // We're reading 16 pixels, and actually only want 8,

        // but we simply ignore the extras.

        perm = vec_lvsl(0, pixels);

        pixv = (vector unsigned char *) pixels;

        bytes = vec_perm(pixv[0], pixv[1], perm);

        // convert the bytes into shorts

        shorts = (vector signed short)vec_mergeh(zero, bytes);

        // save the data to the block, we assume the block is 16-byte aligned

        vec_st(shorts, i*16, (vector signed short*)block);

        pixels += line_size;

    }

}

void diff_pixels_altivec(DCTELEM *restrict block, const uint8_t *s1,

        const uint8_t *s2, int stride)

{

    int i;

    vector unsigned char perm, bytes, *pixv;

    const_vector unsigned char zero = (const_vector unsigned char)vec_splat_u8(0);

    vector signed short shorts1, shorts2;

    for(i=0;i<4;i++)

    {

        // Read potentially unaligned pixels

        // We're reading 16 pixels, and actually only want 8,

        // but we simply ignore the extras.

        perm = vec_lvsl(0, s1);

        pixv = (vector unsigned char *) s1;

        bytes = vec_perm(pixv[0], pixv[1], perm);

        // convert the bytes into shorts

        shorts1 = (vector signed short)vec_mergeh(zero, bytes);

        // Do the same for the second block of pixels

        perm = vec_lvsl(0, s2);

        pixv = (vector unsigned char *) s2;

        bytes = vec_perm(pixv[0], pixv[1], perm);

        // convert the bytes into shorts

        shorts2 = (vector signed short)vec_mergeh(zero, bytes);

        // Do the subtraction

        shorts1 = vec_sub(shorts1, shorts2);

        // save the data to the block, we assume the block is 16-byte aligned

        vec_st(shorts1, 0, (vector signed short*)block);

        s1 += stride;

        s2 += stride;

        block += 8;

        // The code below is a copy of the code above... This is a manual

        // unroll.

        // Read potentially unaligned pixels

        // We're reading 16 pixels, and actually only want 8,

        // but we simply ignore the extras.

        perm = vec_lvsl(0, s1);

        pixv = (vector unsigned char *) s1;

        bytes = vec_perm(pixv[0], pixv[1], perm);

        // convert the bytes into shorts

        shorts1 = (vector signed short)vec_mergeh(zero, bytes);

        // Do the same for the second block of pixels

        perm = vec_lvsl(0, s2);

        pixv = (vector unsigned char *) s2;

        bytes = vec_perm(pixv[0], pixv[1], perm);

        // convert the bytes into shorts

        shorts2 = (vector signed short)vec_mergeh(zero, bytes);

        // Do the subtraction

        shorts1 = vec_sub(shorts1, shorts2);

        // save the data to the block, we assume the block is 16-byte aligned

        vec_st(shorts1, 0, (vector signed short*)block);

        s1 += stride;

        s2 += stride;

        block += 8;

    }

}

void add_bytes_altivec(uint8_t *dst, uint8_t *src, int w) {

    register int i;

    register vector unsigned char vdst, vsrc;

    /* dst and src are 16 bytes-aligned (guaranteed) */

    for(i = 0 ; (i + 15) < w ; i+=16)

    {

      vdst = vec_ld(i, (unsigned char*)dst);

      vsrc = vec_ld(i, (unsigned char*)src);

      vdst = vec_add(vsrc, vdst);

      vec_st(vdst, i, (unsigned char*)dst);

    }

    /* if w is not a multiple of 16 */

    for (; (i < w) ; i++)

    {

      dst[i] = src[i];

    }

}

/* next one assumes that ((line_size % 16) == 0) */

void put_pixels16_altivec(uint8_t *block, const uint8_t *pixels, int line_size, int h)

{

POWERPC_PERF_DECLARE(altivec_put_pixels16_num, 1);

    register vector unsigned char pixelsv1, pixelsv2;

    register vector unsigned char pixelsv1B, pixelsv2B;

    register vector unsigned char pixelsv1C, pixelsv2C;

    register vector unsigned char pixelsv1D, pixelsv2D;

    register vector unsigned char perm = vec_lvsl(0, pixels);

    int i;

    register int line_size_2 = line_size << 1;

    register int line_size_3 = line_size + line_size_2;

    register int line_size_4 = line_size << 2;

POWERPC_PERF_START_COUNT(altivec_put_pixels16_num, 1);

// hand-unrolling the loop by 4 gains about 15%

// mininum execution time goes from 74 to 60 cycles

// it's faster than -funroll-loops, but using

// -funroll-loops w/ this is bad - 74 cycles again.

// all this is on a 7450, tuning for the 7450

#if 0

    for(i=0; i<h; i++) {

      pixelsv1 = vec_ld(0, (unsigned char*)pixels);

      pixelsv2 = vec_ld(16, (unsigned char*)pixels);

      vec_st(vec_perm(pixelsv1, pixelsv2, perm),

             0, (unsigned char*)block);

      pixels+=line_size;

      block +=line_size;

    }

#else

    for(i=0; i<h; i+=4) {

      pixelsv1 = vec_ld(0, (unsigned char*)pixels);

      pixelsv2 = vec_ld(15, (unsigned char*)pixels);

      pixelsv1B = vec_ld(line_size, (unsigned char*)pixels);

      pixelsv2B = vec_ld(15 + line_size, (unsigned char*)pixels);

      pixelsv1C = vec_ld(line_size_2, (unsigned char*)pixels);

      pixelsv2C = vec_ld(15 + line_size_2, (unsigned char*)pixels);

      pixelsv1D = vec_ld(line_size_3, (unsigned char*)pixels);

      pixelsv2D = vec_ld(15 + line_size_3, (unsigned char*)pixels);

      vec_st(vec_perm(pixelsv1, pixelsv2, perm),

             0, (unsigned char*)block);

      vec_st(vec_perm(pixelsv1B, pixelsv2B, perm),

             line_size, (unsigned char*)block);

      vec_st(vec_perm(pixelsv1C, pixelsv2C, perm),

             line_size_2, (unsigned char*)block);

      vec_st(vec_perm(pixelsv1D, pixelsv2D, perm),

             line_size_3, (unsigned char*)block);

      pixels+=line_size_4;

      block +=line_size_4;

    }

#endif

POWERPC_PERF_STOP_COUNT(altivec_put_pixels16_num, 1);

}

/* next one assumes that ((line_size % 16) == 0) */

#define op_avg(a,b)  a = ( ((a)|(b)) - ((((a)^(b))&0xFEFEFEFEUL)>>1) )

void avg_pixels16_altivec(uint8_t *block, const uint8_t *pixels, int line_size, int h)

{

POWERPC_PERF_DECLARE(altivec_avg_pixels16_num, 1);

    register vector unsigned char pixelsv1, pixelsv2, pixelsv, blockv;

    register vector unsigned char perm = vec_lvsl(0, pixels);

    int i;

POWERPC_PERF_START_COUNT(altivec_avg_pixels16_num, 1);

    for(i=0; i<h; i++) {

      pixelsv1 = vec_ld(0, (unsigned char*)pixels);

      pixelsv2 = vec_ld(16, (unsigned char*)pixels);

      blockv = vec_ld(0, block);

      pixelsv = vec_perm(pixelsv1, pixelsv2, perm);

      blockv = vec_avg(blockv,pixelsv);

      vec_st(blockv, 0, (unsigned char*)block);

      pixels+=line_size;

      block +=line_size;

    }

POWERPC_PERF_STOP_COUNT(altivec_avg_pixels16_num, 1);

}

/* next one assumes that ((line_size % 8) == 0) */

void avg_pixels8_altivec(uint8_t * block, const uint8_t * pixels, int line_size, int h)

{

POWERPC_PERF_DECLARE(altivec_avg_pixels8_num, 1);

    register vector unsigned char pixelsv1, pixelsv2, pixelsv, blockv;

    int i;

POWERPC_PERF_START_COUNT(altivec_avg_pixels8_num, 1);

   for (i = 0; i < h; i++) {

     /*

       block is 8 bytes-aligned, so we're either in the

       left block (16 bytes-aligned) or in the right block (not)

     */

     int rightside = ((unsigned long)block & 0x0000000F);

     blockv = vec_ld(0, block);

     pixelsv1 = vec_ld(0, (unsigned char*)pixels);

     pixelsv2 = vec_ld(16, (unsigned char*)pixels);

     pixelsv = vec_perm(pixelsv1, pixelsv2, vec_lvsl(0, pixels));

     if (rightside)

     {

       pixelsv = vec_perm(blockv, pixelsv, vcprm(0,1,s0,s1));

     }

     else

     {

       pixelsv = vec_perm(blockv, pixelsv, vcprm(s0,s1,2,3));

     }

     blockv = vec_avg(blockv, pixelsv);

     vec_st(blockv, 0, block);

     pixels += line_size;

     block += line_size;

   }

POWERPC_PERF_STOP_COUNT(altivec_avg_pixels8_num, 1);

}

/* next one assumes that ((line_size % 8) == 0) */

void put_pixels8_xy2_altivec(uint8_t *block, const uint8_t *pixels, int line_size, int h)

{

POWERPC_PERF_DECLARE(altivec_put_pixels8_xy2_num, 1);

   register int i;

   register vector unsigned char

     pixelsv1, pixelsv2,

     pixelsavg;

   register vector unsigned char

     blockv, temp1, temp2;

   register vector unsigned short

     pixelssum1, pixelssum2, temp3;

   register const_vector unsigned char vczero = (const_vector unsigned char)vec_splat_u8(0);

   register const_vector unsigned short vctwo = (const_vector unsigned short)vec_splat_u16(2);

   temp1 = vec_ld(0, pixels);

   temp2 = vec_ld(16, pixels);

   pixelsv1 = vec_perm(temp1, temp2, vec_lvsl(0, pixels));

   if ((((unsigned long)pixels) & 0x0000000F) ==  0x0000000F)

   {

     pixelsv2 = temp2;

   }

   else

   {

     pixelsv2 = vec_perm(temp1, temp2, vec_lvsl(1, pixels));

   }

   pixelsv1 = vec_mergeh(vczero, pixelsv1);

   pixelsv2 = vec_mergeh(vczero, pixelsv2);

   pixelssum1 = vec_add((vector unsigned short)pixelsv1,

                        (vector unsigned short)pixelsv2);

   pixelssum1 = vec_add(pixelssum1, vctwo);

POWERPC_PERF_START_COUNT(altivec_put_pixels8_xy2_num, 1);

   for (i = 0; i < h ; i++) {

     int rightside = ((unsigned long)block & 0x0000000F);

     blockv = vec_ld(0, block);

     temp1 = vec_ld(line_size, pixels);

     temp2 = vec_ld(line_size + 16, pixels);

     pixelsv1 = vec_perm(temp1, temp2, vec_lvsl(line_size, pixels));

     if (((((unsigned long)pixels) + line_size) & 0x0000000F) ==  0x0000000F)

     {

       pixelsv2 = temp2;

     }

     else

     {

       pixelsv2 = vec_perm(temp1, temp2, vec_lvsl(line_size + 1, pixels));

     }

     pixelsv1 = vec_mergeh(vczero, pixelsv1);

     pixelsv2 = vec_mergeh(vczero, pixelsv2);

     pixelssum2 = vec_add((vector unsigned short)pixelsv1,

                          (vector unsigned short)pixelsv2);

     temp3 = vec_add(pixelssum1, pixelssum2);

     temp3 = vec_sra(temp3, vctwo);

     pixelssum1 = vec_add(pixelssum2, vctwo);

     pixelsavg = vec_packsu(temp3, (vector unsigned short) vczero);

     if (rightside)

     {

       blockv = vec_perm(blockv, pixelsavg, vcprm(0, 1, s0, s1));

     }

     else

     {

       blockv = vec_perm(blockv, pixelsavg, vcprm(s0, s1, 2, 3));

     }

     vec_st(blockv, 0, block);

     block += line_size;

     pixels += line_size;

   }

POWERPC_PERF_STOP_COUNT(altivec_put_pixels8_xy2_num, 1);

}

/* next one assumes that ((line_size % 8) == 0) */

void put_no_rnd_pixels8_xy2_altivec(uint8_t *block, const uint8_t *pixels, int line_size, int h)

{

POWERPC_PERF_DECLARE(altivec_put_no_rnd_pixels8_xy2_num, 1);

   register int i;

   register vector unsigned char

     pixelsv1, pixelsv2,

     pixelsavg;

   register vector unsigned char

     blockv, temp1, temp2;

   register vector unsigned short

     pixelssum1, pixelssum2, temp3;

   register const_vector unsigned char vczero = (const_vector unsigned char)vec_splat_u8(0);

   register const_vector unsigned short vcone = (const_vector unsigned short)vec_splat_u16(1);

   register const_vector unsigned short vctwo = (const_vector unsigned short)vec_splat_u16(2);

   temp1 = vec_ld(0, pixels);

   temp2 = vec_ld(16, pixels);

   pixelsv1 = vec_perm(temp1, temp2, vec_lvsl(0, pixels));

   if ((((unsigned long)pixels) & 0x0000000F) ==  0x0000000F)

   {

     pixelsv2 = temp2;

   }

   else

   {

     pixelsv2 = vec_perm(temp1, temp2, vec_lvsl(1, pixels));

   }

   pixelsv1 = vec_mergeh(vczero, pixelsv1);

   pixelsv2 = vec_mergeh(vczero, pixelsv2);

   pixelssum1 = vec_add((vector unsigned short)pixelsv1,

                        (vector unsigned short)pixelsv2);

   pixelssum1 = vec_add(pixelssum1, vcone);

POWERPC_PERF_START_COUNT(altivec_put_no_rnd_pixels8_xy2_num, 1);

   for (i = 0; i < h ; i++) {

     int rightside = ((unsigned long)block & 0x0000000F);

     blockv = vec_ld(0, block);

     temp1 = vec_ld(line_size, pixels);

     temp2 = vec_ld(line_size + 16, pixels);

     pixelsv1 = vec_perm(temp1, temp2, vec_lvsl(line_size, pixels));

     if (((((unsigned long)pixels) + line_size) & 0x0000000F) ==  0x0000000F)

     {

       pixelsv2 = temp2;

     }

     else

     {

       pixelsv2 = vec_perm(temp1, temp2, vec_lvsl(line_size + 1, pixels));

     }

     pixelsv1 = vec_mergeh(vczero, pixelsv1);

     pixelsv2 = vec_mergeh(vczero, pixelsv2);

     pixelssum2 = vec_add((vector unsigned short)pixelsv1,

                          (vector unsigned short)pixelsv2);

     temp3 = vec_add(pixelssum1, pixelssum2);

     temp3 = vec_sra(temp3, vctwo);

     pixelssum1 = vec_add(pixelssum2, vcone);

     pixelsavg = vec_packsu(temp3, (vector unsigned short) vczero);

     if (rightside)

     {

       blockv = vec_perm(blockv, pixelsavg, vcprm(0, 1, s0, s1));

     }

     else

     {

       blockv = vec_perm(blockv, pixelsavg, vcprm(s0, s1, 2, 3));

     }

     vec_st(blockv, 0, block);

     block += line_size;

     pixels += line_size;

   }

POWERPC_PERF_STOP_COUNT(altivec_put_no_rnd_pixels8_xy2_num, 1);

}

/* next one assumes that ((line_size % 16) == 0) */

void put_pixels16_xy2_altivec(uint8_t * block, const uint8_t * pixels, int line_size, int h)

{

POWERPC_PERF_DECLARE(altivec_put_pixels16_xy2_num, 1);

   register int i;

   register vector unsigned char

     pixelsv1, pixelsv2, pixelsv3, pixelsv4;

   register vector unsigned char

     blockv, temp1, temp2;

   register vector unsigned short

     pixelssum1, pixelssum2, temp3,

     pixelssum3, pixelssum4, temp4;

   register const_vector unsigned char vczero = (const_vector unsigned char)vec_splat_u8(0);

   register const_vector unsigned short vctwo = (const_vector unsigned short)vec_splat_u16(2);

POWERPC_PERF_START_COUNT(altivec_put_pixels16_xy2_num, 1);

   temp1 = vec_ld(0, pixels);

   temp2 = vec_ld(16, pixels);

   pixelsv1 = vec_perm(temp1, temp2, vec_lvsl(0, pixels));

   if ((((unsigned long)pixels) & 0x0000000F) ==  0x0000000F)

   {

     pixelsv2 = temp2;

   }

   else

   {

     pixelsv2 = vec_perm(temp1, temp2, vec_lvsl(1, pixels));

   }

   pixelsv3 = vec_mergel(vczero, pixelsv1);

   pixelsv4 = vec_mergel(vczero, pixelsv2);

   pixelsv1 = vec_mergeh(vczero, pixelsv1);

   pixelsv2 = vec_mergeh(vczero, pixelsv2);

   pixelssum3 = vec_add((vector unsigned short)pixelsv3,

                        (vector unsigned short)pixelsv4);

   pixelssum3 = vec_add(pixelssum3, vctwo);

   pixelssum1 = vec_add((vector unsigned short)pixelsv1,

                        (vector unsigned short)pixelsv2);

   pixelssum1 = vec_add(pixelssum1, vctwo);

   for (i = 0; i < h ; i++) {

     blockv = vec_ld(0, block);

     temp1 = vec_ld(line_size, pixels);

     temp2 = vec_ld(line_size + 16, pixels);

     pixelsv1 = vec_perm(temp1, temp2, vec_lvsl(line_size, pixels));

     if (((((unsigned long)pixels) + line_size) & 0x0000000F) ==  0x0000000F)

     {

       pixelsv2 = temp2;

     }

     else

     {

       pixelsv2 = vec_perm(temp1, temp2, vec_lvsl(line_size + 1, pixels));

     }

     pixelsv3 = vec_mergel(vczero, pixelsv1);

     pixelsv4 = vec_mergel(vczero, pixelsv2);

     pixelsv1 = vec_mergeh(vczero, pixelsv1);

     pixelsv2 = vec_mergeh(vczero, pixelsv2);

     pixelssum4 = vec_add((vector unsigned short)pixelsv3,

                          (vector unsigned short)pixelsv4);

     pixelssum2 = vec_add((vector unsigned short)pixelsv1,

                          (vector unsigned short)pixelsv2);

     temp4 = vec_add(pixelssum3, pixelssum4);

     temp4 = vec_sra(temp4, vctwo);

     temp3 = vec_add(pixelssum1, pixelssum2);

     temp3 = vec_sra(temp3, vctwo);

     pixelssum3 = vec_add(pixelssum4, vctwo);

     pixelssum1 = vec_add(pixelssum2, vctwo);

     blockv = vec_packsu(temp3, temp4);

     vec_st(blockv, 0, block);

     block += line_size;

     pixels += line_size;

   }

POWERPC_PERF_STOP_COUNT(altivec_put_pixels16_xy2_num, 1);

}

/* next one assumes that ((line_size % 16) == 0) */

void put_no_rnd_pixels16_xy2_altivec(uint8_t * block, const uint8_t * pixels, int line_size, int h)

{

POWERPC_PERF_DECLARE(altivec_put_no_rnd_pixels16_xy2_num, 1);

   register int i;

   register vector unsigned char

     pixelsv1, pixelsv2, pixelsv3, pixelsv4;

   register vector unsigned char

     blockv, temp1, temp2;

   register vector unsigned short

     pixelssum1, pixelssum2, temp3,

     pixelssum3, pixelssum4, temp4;

   register const_vector unsigned char vczero = (const_vector unsigned char)vec_splat_u8(0);

   register const_vector unsigned short vcone = (const_vector unsigned short)vec_splat_u16(1);

   register const_vector unsigned short vctwo = (const_vector unsigned short)vec_splat_u16(2);

POWERPC_PERF_START_COUNT(altivec_put_no_rnd_pixels16_xy2_num, 1);

   temp1 = vec_ld(0, pixels);

   temp2 = vec_ld(16, pixels);

   pixelsv1 = vec_perm(temp1, temp2, vec_lvsl(0, pixels));

   if ((((unsigned long)pixels) & 0x0000000F) ==  0x0000000F)

   {

     pixelsv2 = temp2;

   }

   else

   {

     pixelsv2 = vec_perm(temp1, temp2, vec_lvsl(1, pixels));

   }

   pixelsv3 = vec_mergel(vczero, pixelsv1);

   pixelsv4 = vec_mergel(vczero, pixelsv2);

   pixelsv1 = vec_mergeh(vczero, pixelsv1);

   pixelsv2 = vec_mergeh(vczero, pixelsv2);

   pixelssum3 = vec_add((vector unsigned short)pixelsv3,

                        (vector unsigned short)pixelsv4);

   pixelssum3 = vec_add(pixelssum3, vcone);

   pixelssum1 = vec_add((vector unsigned short)pixelsv1,

                        (vector unsigned short)pixelsv2);

   pixelssum1 = vec_add(pixelssum1, vcone);

   for (i = 0; i < h ; i++) {

     blockv = vec_ld(0, block);

     temp1 = vec_ld(line_size, pixels);

     temp2 = vec_ld(line_size + 16, pixels);

     pixelsv1 = vec_perm(temp1, temp2, vec_lvsl(line_size, pixels));

     if (((((unsigned long)pixels) + line_size) & 0x0000000F) ==  0x0000000F)

     {

       pixelsv2 = temp2;

     }

     else

     {

       pixelsv2 = vec_perm(temp1, temp2, vec_lvsl(line_size + 1, pixels));

     }

     pixelsv3 = vec_mergel(vczero, pixelsv1);

     pixelsv4 = vec_mergel(vczero, pixelsv2);

     pixelsv1 = vec_mergeh(vczero, pixelsv1);

     pixelsv2 = vec_mergeh(vczero, pixelsv2);

     pixelssum4 = vec_add((vector unsigned short)pixelsv3,

                          (vector unsigned short)pixelsv4);

     pixelssum2 = vec_add((vector unsigned short)pixelsv1,

                          (vector unsigned short)pixelsv2);

     temp4 = vec_add(pixelssum3, pixelssum4);

     temp4 = vec_sra(temp4, vctwo);

     temp3 = vec_add(pixelssum1, pixelssum2);

     temp3 = vec_sra(temp3, vctwo);

     pixelssum3 = vec_add(pixelssum4, vcone);

     pixelssum1 = vec_add(pixelssum2, vcone);

     blockv = vec_packsu(temp3, temp4);

     vec_st(blockv, 0, block);

     block += line_size;

     pixels += line_size;

   }

POWERPC_PERF_STOP_COUNT(altivec_put_no_rnd_pixels16_xy2_num, 1);

}

int hadamard8_diff8x8_altivec(/*MpegEncContext*/ void *s, uint8_t *dst, uint8_t *src, int stride, int h){

POWERPC_PERF_DECLARE(altivec_hadamard8_diff8x8_num, 1);

    int sum;

    register const_vector unsigned char vzero =

                            (const_vector unsigned char)vec_splat_u8(0);

    register vector signed short temp0, temp1, temp2, temp3, temp4,

                                 temp5, temp6, temp7;

POWERPC_PERF_START_COUNT(altivec_hadamard8_diff8x8_num, 1);

  {

    register const_vector signed short vprod1 =(const_vector signed short)

                                        AVV( 1,-1, 1,-1, 1,-1, 1,-1);

    register const_vector signed short vprod2 =(const_vector signed short)

                                        AVV( 1, 1,-1,-1, 1, 1,-1,-1);

    register const_vector signed short vprod3 =(const_vector signed short)

                                        AVV( 1, 1, 1, 1,-1,-1,-1,-1);

    register const_vector unsigned char perm1 = (const_vector unsigned char)

      AVV(0x02, 0x03, 0x00, 0x01, 0x06, 0x07, 0x04, 0x05,

          0x0A, 0x0B, 0x08, 0x09, 0x0E, 0x0F, 0x0C, 0x0D);

    register const_vector unsigned char perm2 = (const_vector unsigned char)

      AVV(0x04, 0x05, 0x06, 0x07, 0x00, 0x01, 0x02, 0x03,

          0x0C, 0x0D, 0x0E, 0x0F, 0x08, 0x09, 0x0A, 0x0B);

    register const_vector unsigned char perm3 = (const_vector unsigned char)

      AVV(0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,

          0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07);

#define ONEITERBUTTERFLY(i, res)                                        \

    {                                                                   \

      register vector unsigned char src1, src2, srcO;                   \

      register vector unsigned char dst1, dst2, dstO;                   \

      register vector signed short srcV, dstV;                          \

      register vector signed short but0, but1, but2, op1, op2, op3;     \

      src1 = vec_ld(stride * i, src);                                   \

      src2 = vec_ld((stride * i) + 15, src);                            \

      srcO = vec_perm(src1, src2, vec_lvsl(stride * i, src));           \

      dst1 = vec_ld(stride * i, dst);                                   \

      dst2 = vec_ld((stride * i) + 15, dst);                            \

      dstO = vec_perm(dst1, dst2, vec_lvsl(stride * i, dst));           \

      /* promote the unsigned chars to signed shorts */                 \

      /* we're in the 8x8 function, we only care for the first 8 */     \

      srcV =                                                            \

        (vector signed short)vec_mergeh((vector signed char)vzero,      \

        (vector signed char)srcO);                                      \

      dstV =                                                            \

        (vector signed short)vec_mergeh((vector signed char)vzero,      \

        (vector signed char)dstO);                                      \

      /* substractions inside the first butterfly */                    \

      but0 = vec_sub(srcV, dstV);                                       \

      op1 = vec_perm(but0, but0, perm1);                                \

      but1 = vec_mladd(but0, vprod1, op1);                              \

      op2 = vec_perm(but1, but1, perm2);                                \

      but2 = vec_mladd(but1, vprod2, op2);                              \

      op3 = vec_perm(but2, but2, perm3);                                \

      res = vec_mladd(but2, vprod3, op3);                               \

    }

    ONEITERBUTTERFLY(0, temp0);

    ONEITERBUTTERFLY(1, temp1);

    ONEITERBUTTERFLY(2, temp2);

    ONEITERBUTTERFLY(3, temp3);

    ONEITERBUTTERFLY(4, temp4);

    ONEITERBUTTERFLY(5, temp5);

    ONEITERBUTTERFLY(6, temp6);

    ONEITERBUTTERFLY(7, temp7);

  }

#undef ONEITERBUTTERFLY

  {

    register vector signed int vsum;

    register vector signed short line0 = vec_add(temp0, temp1);

    register vector signed short line1 = vec_sub(temp0, temp1);

    register vector signed short line2 = vec_add(temp2, temp3);

    register vector signed short line3 = vec_sub(temp2, temp3);

    register vector signed short line4 = vec_add(temp4, temp5);

    register vector signed short line5 = vec_sub(temp4, temp5);

    register vector signed short line6 = vec_add(temp6, temp7);

    register vector signed short line7 = vec_sub(temp6, temp7);

    register vector signed short line0B = vec_add(line0, line2);

    register vector signed short line2B = vec_sub(line0, line2);

    register vector signed short line1B = vec_add(line1, line3);

    register vector signed short line3B = vec_sub(line1, line3);

    register vector signed short line4B = vec_add(line4, line6);

    register vector signed short line6B = vec_sub(line4, line6);

    register vector signed short line5B = vec_add(line5, line7);

    register vector signed short line7B = vec_sub(line5, line7);

    register vector signed short line0C = vec_add(line0B, line4B);

    register vector signed short line4C = vec_sub(line0B, line4B);

    register vector signed short line1C = vec_add(line1B, line5B);

    register vector signed short line5C = vec_sub(line1B, line5B);

    register vector signed short line2C = vec_add(line2B, line6B);

    register vector signed short line6C = vec_sub(line2B, line6B);

    register vector signed short line3C = vec_add(line3B, line7B);

    register vector signed short line7C = vec_sub(line3B, line7B);

    vsum = vec_sum4s(vec_abs(line0C), vec_splat_s32(0));

    vsum = vec_sum4s(vec_abs(line1C), vsum);

    vsum = vec_sum4s(vec_abs(line2C), vsum);

    vsum = vec_sum4s(vec_abs(line3C), vsum);

    vsum = vec_sum4s(vec_abs(line4C), vsum);

    vsum = vec_sum4s(vec_abs(line5C), vsum);

    vsum = vec_sum4s(vec_abs(line6C), vsum);

    vsum = vec_sum4s(vec_abs(line7C), vsum);

    vsum = vec_sums(vsum, (vector signed int)vzero);

    vsum = vec_splat(vsum, 3);

    vec_ste(vsum, 0, &sum);

  }

POWERPC_PERF_STOP_COUNT(altivec_hadamard8_diff8x8_num, 1);

  return sum;

}

/*

  16x8 works with 16 elements ; it allows to avoid replicating

  loads, and give the compiler more rooms for scheduling.

  It's only used from inside hadamard8_diff16_altivec.

  Unfortunately, it seems gcc-3.3 is a bit dumb, and

  the compiled code has a LOT of spill code, it seems

  gcc (unlike xlc) cannot keep everything in registers

  by itself. The following code include hand-made

  registers allocation. It's not clean, but on

  a 7450 the resulting code is much faster (best case

  fall from 700+ cycles to 550).

  xlc doesn't add spill code, but it doesn't know how to

  schedule for the 7450, and its code isn't much faster than

  gcc-3.3 on the 7450 (but uses 25% less instructions...)

  On the 970, the hand-made RA is still a win (arount 690

  vs. around 780), but xlc goes to around 660 on the

  regular C code...

*/

static int hadamard8_diff16x8_altivec(/*MpegEncContext*/ void *s, uint8_t *dst, uint8_t *src, int stride, int h) {

    int sum;

    register vector signed short

        temp0 REG_v(v0),

        temp1 REG_v(v1),

        temp2 REG_v(v2),

        temp3 REG_v(v3),

        temp4 REG_v(v4),

        temp5 REG_v(v5),

        temp6 REG_v(v6),

        temp7 REG_v(v7);

    register vector signed short

        temp0S REG_v(v8),

        temp1S REG_v(v9),

        temp2S REG_v(v10),

        temp3S REG_v(v11),

        temp4S REG_v(v12),

        temp5S REG_v(v13),

        temp6S REG_v(v14),

        temp7S REG_v(v15);

    register const_vector unsigned char vzero REG_v(v31)=

        (const_vector unsigned char)vec_splat_u8(0);

  {

    register const_vector signed short vprod1 REG_v(v16)=

        (const_vector signed short)AVV( 1,-1, 1,-1, 1,-1, 1,-1);

    register const_vector signed short vprod2 REG_v(v17)=

        (const_vector signed short)AVV( 1, 1,-1,-1, 1, 1,-1,-1);

    register const_vector signed short vprod3 REG_v(v18)=

        (const_vector signed short)AVV( 1, 1, 1, 1,-1,-1,-1,-1);

    register const_vector unsigned char perm1 REG_v(v19)=

        (const_vector unsigned char)

        AVV(0x02, 0x03, 0x00, 0x01, 0x06, 0x07, 0x04, 0x05,

            0x0A, 0x0B, 0x08, 0x09, 0x0E, 0x0F, 0x0C, 0x0D);

    register const_vector unsigned char perm2 REG_v(v20)=

        (const_vector unsigned char)

        AVV(0x04, 0x05, 0x06, 0x07, 0x00, 0x01, 0x02, 0x03,

            0x0C, 0x0D, 0x0E, 0x0F, 0x08, 0x09, 0x0A, 0x0B);

    register const_vector unsigned char perm3 REG_v(v21)=

        (const_vector unsigned char)

        AVV(0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,

            0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07);

#define ONEITERBUTTERFLY(i, res1, res2)                                 \

    {                                                                   \

      register vector unsigned char src1 REG_v(v22),                    \

                                    src2 REG_v(v23),                    \

                                    dst1 REG_v(v24),                    \

                                    dst2 REG_v(v25),                    \

                                    srcO REG_v(v22),                    \

                                    dstO REG_v(v23);                    \

                                                                        \

      register vector signed short  srcV REG_v(v24),                    \

                                    dstV REG_v(v25),                    \

                                    srcW REG_v(v26),                    \

                                    dstW REG_v(v27),                    \

                                    but0 REG_v(v28),                    \

                                    but0S REG_v(v29),                   \

                                    op1 REG_v(v30),                     \