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added optimized dgemv_n kernel for POWER8

tags/v0.2.18^2
Werner Saar 10 years ago
parent
a571359afd
commit
68a69c5b50
3 changed files with 728 additions and 1 deletions
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  1. +1
    -1
      kernel/power/KERNEL.POWER8
  2. +426
    -0
      kernel/power/dgemv_n.c
  3. +301
    -0
      kernel/power/dgemv_n_microk_power8.c

+ 1
- 1
kernel/power/KERNEL.POWER8 View File

@@ -147,7 +147,7 @@ ZSWAPKERNEL = zswap.c
# #


#SGEMVNKERNEL = ../arm/gemv_n.c #SGEMVNKERNEL = ../arm/gemv_n.c
#DGEMVNKERNEL = ../arm/gemv_n.c
DGEMVNKERNEL = dgemv_n.c
#CGEMVNKERNEL = ../arm/zgemv_n.c #CGEMVNKERNEL = ../arm/zgemv_n.c
#ZGEMVNKERNEL = ../arm/zgemv_n.c #ZGEMVNKERNEL = ../arm/zgemv_n.c
# #


+ 426
- 0
kernel/power/dgemv_n.c View File

@@ -0,0 +1,426 @@
/***************************************************************************
Copyright (c) 2013-2016, The OpenBLAS Project
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
3. Neither the name of the OpenBLAS project nor the names of
its contributors may be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBLAS PROJECT OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*****************************************************************************/

/**************************************************************************************
* 2016/03/30 Werner Saar (wernsaar@googlemail.com)
* BLASTEST : OK
* CTEST : OK
* TEST : OK
* LAPACK-TEST : OK
**************************************************************************************/



#include "common.h"


#if defined(POWER8)
#include "dgemv_n_microk_power8.c"
#endif


#define NBMAX 4096

#ifndef HAVE_KERNEL_4x4

static void dgemv_kernel_4x4(BLASLONG n, FLOAT **ap, FLOAT *xo, FLOAT *y, FLOAT *alpha)
{
BLASLONG i;
FLOAT *a0,*a1,*a2,*a3;
FLOAT x[4] __attribute__ ((aligned (16)));;
a0 = ap[0];
a1 = ap[1];
a2 = ap[2];
a3 = ap[3];

for ( i=0; i<4; i++)
x[i] = xo[i] * *alpha;

for ( i=0; i< n; i+=4 )
{
y[i] += a0[i]*x[0] + a1[i]*x[1] + a2[i]*x[2] + a3[i]*x[3];
y[i+1] += a0[i+1]*x[0] + a1[i+1]*x[1] + a2[i+1]*x[2] + a3[i+1]*x[3];
y[i+2] += a0[i+2]*x[0] + a1[i+2]*x[1] + a2[i+2]*x[2] + a3[i+2]*x[3];
y[i+3] += a0[i+3]*x[0] + a1[i+3]*x[1] + a2[i+3]*x[2] + a3[i+3]*x[3];
}
}

#endif

#ifndef HAVE_KERNEL_4x2

static void dgemv_kernel_4x2(BLASLONG n, FLOAT **ap, FLOAT *xo, FLOAT *y, FLOAT *alpha)
{
BLASLONG i;
FLOAT *a0,*a1;
FLOAT x[4] __attribute__ ((aligned (16)));;
a0 = ap[0];
a1 = ap[1];

for ( i=0; i<2; i++)
x[i] = xo[i] * *alpha;

for ( i=0; i< n; i+=4 )
{
y[i] += a0[i]*x[0] + a1[i]*x[1];
y[i+1] += a0[i+1]*x[0] + a1[i+1]*x[1];
y[i+2] += a0[i+2]*x[0] + a1[i+2]*x[1];
y[i+3] += a0[i+3]*x[0] + a1[i+3]*x[1];
}
}


#endif

#ifndef HAVE_KERNEL_4x1

static void dgemv_kernel_4x1(BLASLONG n, FLOAT *ap, FLOAT *xo, FLOAT *y, FLOAT *alpha)
{
BLASLONG i;
FLOAT *a0;
FLOAT x[4] __attribute__ ((aligned (16)));;
a0 = ap;

for ( i=0; i<1; i++)
x[i] = xo[i] * *alpha;

for ( i=0; i< n; i+=4 )
{
y[i] += a0[i]*x[0];
y[i+1] += a0[i+1]*x[0];
y[i+2] += a0[i+2]*x[0];
y[i+3] += a0[i+3]*x[0];
}
}


#endif


static void add_y(BLASLONG n, FLOAT *src, FLOAT *dest, BLASLONG inc_dest)
{
BLASLONG i;
if ( inc_dest != 1 )
{
for ( i=0; i<n; i++ )
{
*dest += *src;
src++;
dest += inc_dest;
}
return;
}

}

int CNAME(BLASLONG m, BLASLONG n, BLASLONG dummy1, FLOAT alpha, FLOAT *a, BLASLONG lda, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y, FLOAT *buffer)
{

BLASLONG i;
BLASLONG j;
FLOAT *a_ptr;
FLOAT *x_ptr;
FLOAT *y_ptr;
BLASLONG n1;
BLASLONG m1;
BLASLONG m2;
BLASLONG m3;
BLASLONG n2;
BLASLONG lda4 = lda << 2;
FLOAT *ap[4] __attribute__ ((aligned (16)));;
FLOAT xbuffer[8] __attribute__ ((aligned (16)));;
FLOAT alpha_r[4] __attribute__ ((aligned (16)));;
FLOAT *ybuffer;

alpha_r[0] = alpha;

if ( m < 1 ) return(0);
if ( n < 1 ) return(0);

ybuffer = buffer;
n1 = n >> 2 ;
n2 = n & 3 ;

m3 = m & 3 ;
m1 = m & -4 ;
m2 = (m & (NBMAX-1)) - m3 ;

y_ptr = y;

BLASLONG NB = NBMAX;

while ( NB == NBMAX )
{
m1 -= NB;
if ( m1 < 0)
{
if ( m2 == 0 ) break;
NB = m2;
}
a_ptr = a;
x_ptr = x;
ap[0] = a_ptr;
ap[1] = a_ptr + lda;
ap[2] = ap[1] + lda;
ap[3] = ap[2] + lda;

if ( inc_y != 1 )
memset(ybuffer,0,NB*8);
else
ybuffer = y_ptr;

if ( inc_x == 1 )
{


for( i = 0; i < n1 ; i++)
{
dgemv_kernel_4x4(NB,ap,x_ptr,ybuffer,alpha_r);
ap[0] += lda4;
ap[1] += lda4;
ap[2] += lda4;
ap[3] += lda4;
a_ptr += lda4;
x_ptr += 4;
}

if ( n2 & 2 )
{
dgemv_kernel_4x2(NB,ap,x_ptr,ybuffer,alpha_r);
a_ptr += lda*2;
x_ptr += 2;
}


if ( n2 & 1 )
{
dgemv_kernel_4x1(NB,a_ptr,x_ptr,ybuffer,alpha_r);
a_ptr += lda;
x_ptr += 1;

}


}
else
{

for( i = 0; i < n1 ; i++)
{
xbuffer[0] = x_ptr[0];
x_ptr += inc_x;
xbuffer[1] = x_ptr[0];
x_ptr += inc_x;
xbuffer[2] = x_ptr[0];
x_ptr += inc_x;
xbuffer[3] = x_ptr[0];
x_ptr += inc_x;
dgemv_kernel_4x4(NB,ap,xbuffer,ybuffer,alpha_r);
ap[0] += lda4;
ap[1] += lda4;
ap[2] += lda4;
ap[3] += lda4;
a_ptr += lda4;
}

for( i = 0; i < n2 ; i++)
{
xbuffer[0] = x_ptr[0];
x_ptr += inc_x;
dgemv_kernel_4x1(NB,a_ptr,xbuffer,ybuffer,alpha_r);
a_ptr += lda;

}

}

a += NB;
if ( inc_y != 1 )
{
add_y(NB,ybuffer,y_ptr,inc_y);
y_ptr += NB * inc_y;
}
else
y_ptr += NB ;

}

if ( m3 == 0 ) return(0);

if ( m3 == 3 )
{
a_ptr = a;
x_ptr = x;
FLOAT temp0 = 0.0;
FLOAT temp1 = 0.0;
FLOAT temp2 = 0.0;
if ( lda == 3 && inc_x ==1 )
{

for( i = 0; i < ( n & -4 ); i+=4 )
{

temp0 += a_ptr[0] * x_ptr[0] + a_ptr[3] * x_ptr[1];
temp1 += a_ptr[1] * x_ptr[0] + a_ptr[4] * x_ptr[1];
temp2 += a_ptr[2] * x_ptr[0] + a_ptr[5] * x_ptr[1];

temp0 += a_ptr[6] * x_ptr[2] + a_ptr[9] * x_ptr[3];
temp1 += a_ptr[7] * x_ptr[2] + a_ptr[10] * x_ptr[3];
temp2 += a_ptr[8] * x_ptr[2] + a_ptr[11] * x_ptr[3];

a_ptr += 12;
x_ptr += 4;
}

for( ; i < n; i++ )
{
temp0 += a_ptr[0] * x_ptr[0];
temp1 += a_ptr[1] * x_ptr[0];
temp2 += a_ptr[2] * x_ptr[0];
a_ptr += 3;
x_ptr ++;
}

}
else
{

for( i = 0; i < n; i++ )
{
temp0 += a_ptr[0] * x_ptr[0];
temp1 += a_ptr[1] * x_ptr[0];
temp2 += a_ptr[2] * x_ptr[0];
a_ptr += lda;
x_ptr += inc_x;


}

}
y_ptr[0] += alpha * temp0;
y_ptr += inc_y;
y_ptr[0] += alpha * temp1;
y_ptr += inc_y;
y_ptr[0] += alpha * temp2;
return(0);
}


if ( m3 == 2 )
{
a_ptr = a;
x_ptr = x;
FLOAT temp0 = 0.0;
FLOAT temp1 = 0.0;
if ( lda == 2 && inc_x ==1 )
{

for( i = 0; i < (n & -4) ; i+=4 )
{
temp0 += a_ptr[0] * x_ptr[0] + a_ptr[2] * x_ptr[1];
temp1 += a_ptr[1] * x_ptr[0] + a_ptr[3] * x_ptr[1];
temp0 += a_ptr[4] * x_ptr[2] + a_ptr[6] * x_ptr[3];
temp1 += a_ptr[5] * x_ptr[2] + a_ptr[7] * x_ptr[3];
a_ptr += 8;
x_ptr += 4;

}


for( ; i < n; i++ )
{
temp0 += a_ptr[0] * x_ptr[0];
temp1 += a_ptr[1] * x_ptr[0];
a_ptr += 2;
x_ptr ++;
}

}
else
{

for( i = 0; i < n; i++ )
{
temp0 += a_ptr[0] * x_ptr[0];
temp1 += a_ptr[1] * x_ptr[0];
a_ptr += lda;
x_ptr += inc_x;


}

}
y_ptr[0] += alpha * temp0;
y_ptr += inc_y;
y_ptr[0] += alpha * temp1;
return(0);
}

if ( m3 == 1 )
{
a_ptr = a;
x_ptr = x;
FLOAT temp = 0.0;
if ( lda == 1 && inc_x ==1 )
{

for( i = 0; i < (n & -4); i+=4 )
{
temp += a_ptr[i] * x_ptr[i] + a_ptr[i+1] * x_ptr[i+1] + a_ptr[i+2] * x_ptr[i+2] + a_ptr[i+3] * x_ptr[i+3];
}

for( ; i < n; i++ )
{
temp += a_ptr[i] * x_ptr[i];
}

}
else
{

for( i = 0; i < n; i++ )
{
temp += a_ptr[0] * x_ptr[0];
a_ptr += lda;
x_ptr += inc_x;
}

}
y_ptr[0] += alpha * temp;
return(0);
}


return(0);
}



+ 301
- 0
kernel/power/dgemv_n_microk_power8.c View File

@@ -0,0 +1,301 @@
/***************************************************************************
Copyright (c) 2013-2016, The OpenBLAS Project
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
3. Neither the name of the OpenBLAS project nor the names of
its contributors may be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBLAS PROJECT OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*****************************************************************************/

/**************************************************************************************
* 2016/03/30 Werner Saar (wernsaar@googlemail.com)
* BLASTEST : OK
* CTEST : OK
* TEST : OK
* LAPACK-TEST : OK
**************************************************************************************/

#define HAVE_KERNEL_4x4 1

static void dgemv_kernel_4x4(BLASLONG n, FLOAT **ap, FLOAT *xo, FLOAT *y, FLOAT *alpha) __attribute__ ((noinline));

static void dgemv_kernel_4x4(BLASLONG n, FLOAT **ap, FLOAT *xo, FLOAT *y, FLOAT *alpha)
{
BLASLONG i=n;
BLASLONG o8 = 8;
BLASLONG o16 = 16;
BLASLONG o24 = 24;
BLASLONG pre = 384;

FLOAT *a0,*a1,*a2,*a3;
FLOAT *y1=y+1;
FLOAT x[4] __attribute__ ((aligned (16)));;
a0 = ap[0]+1;
a1 = ap[1]+1;
a2 = ap[2]+1;
a3 = ap[3]+1;

x[0]=xo[0] * *alpha;
x[1]=xo[1] * *alpha;
x[2]=xo[2] * *alpha;
x[3]=xo[3] * *alpha;


__asm__ __volatile__
(
"lxvdsx 32, 0 , %1 \n\t" // x0
"lxvdsx 33,%3 , %1 \n\t" // x1
"lxvdsx 34,%4 , %1 \n\t" // x2
"lxvdsx 35,%5 , %1 \n\t" // x3
"addi %2 , %2 , -8 \n\t"
"addi %6 , %6 , -8 \n\t"
"addi %7 , %7 , -8 \n\t"
"addi %8 , %8 , -8 \n\t"
"addi %9 , %9 , -8 \n\t"
"lxvd2x 48, 0, %6 \n\t" // a0[0], a0[1]
"lxvd2x 49,%4, %6 \n\t" // a0[2], a0[3]

"lxvd2x 50, 0, %7 \n\t" // a1[0], a1[1]
"lxvd2x 51,%4, %7 \n\t" // a1[2], a1[3]

"lxvd2x 52, 0, %8 \n\t" // a2[0], a2[1]
"lxvd2x 53,%4, %8 \n\t" // a2[2], a2[3]

"lxvd2x 54, 0, %9 \n\t" // a3[0], a3[1]
"lxvd2x 55,%4, %9 \n\t" // a3[2], a3[3]

"addi %6, %6, 32 \n\t"
"addi %7, %7, 32 \n\t"
"addi %8, %8, 32 \n\t"
"addi %9, %9, 32 \n\t"

"addic. %0 , %0 , -4 \n\t"
"ble 2f \n\t"

".align 5 \n\t"
"1: \n\t"

"dcbt %2, %10 \n\t"

"lxvd2x 40, 0, %2 \n\t" // y0, y1
"lxvd2x 41,%4, %2 \n\t" // y2, y3
"dcbt %6, %10 \n\t"
"dcbt %7, %10 \n\t"
"dcbt %8, %10 \n\t"
"dcbt %9, %10 \n\t"

"xvmaddadp 40, 48, 32 \n\t"
"xvmaddadp 41, 49, 32 \n\t"

"lxvd2x 48, 0, %6 \n\t" // a0[0], a0[1]
"lxvd2x 49,%4, %6 \n\t" // a0[2], a0[3]

"xvmaddadp 40, 50, 33 \n\t"
"addi %6, %6, 32 \n\t"
"xvmaddadp 41, 51, 33 \n\t"

"lxvd2x 50, 0, %7 \n\t" // a1[0], a1[1]
"lxvd2x 51,%4, %7 \n\t" // a1[2], a1[3]

"xvmaddadp 40, 52, 34 \n\t"
"addi %7, %7, 32 \n\t"
"xvmaddadp 41, 53, 34 \n\t"

"lxvd2x 52, 0, %8 \n\t" // a2[0], a2[1]
"lxvd2x 53,%4, %8 \n\t" // a2[2], a2[3]

"xvmaddadp 40, 54, 35 \n\t"
"addi %8, %8, 32 \n\t"
"xvmaddadp 41, 55, 35 \n\t"

"stxvd2x 40, 0, %2 \n\t" // y0, y1
"stxvd2x 41,%4, %2 \n\t" // y2, y3

"lxvd2x 54, 0, %9 \n\t" // a3[0], a3[1]
"lxvd2x 55,%4, %9 \n\t" // a3[2], a3[3]

"addi %9, %9, 32 \n\t"
"addi %2, %2, 32 \n\t"

"addic. %0 , %0 , -4 \n\t"
"ble 2f \n\t"


"lxvd2x 40, 0, %2 \n\t" // y0, y1
"lxvd2x 41,%4, %2 \n\t" // y2, y3
"xvmaddadp 40, 48, 32 \n\t"
"xvmaddadp 41, 49, 32 \n\t"

"lxvd2x 48, 0, %6 \n\t" // a0[0], a0[1]
"lxvd2x 49,%4, %6 \n\t" // a0[2], a0[3]

"xvmaddadp 40, 50, 33 \n\t"
"addi %6, %6, 32 \n\t"
"xvmaddadp 41, 51, 33 \n\t"

"lxvd2x 50, 0, %7 \n\t" // a1[0], a1[1]
"lxvd2x 51,%4, %7 \n\t" // a1[2], a1[3]

"xvmaddadp 40, 52, 34 \n\t"
"addi %7, %7, 32 \n\t"
"xvmaddadp 41, 53, 34 \n\t"

"lxvd2x 52, 0, %8 \n\t" // a2[0], a2[1]
"lxvd2x 53,%4, %8 \n\t" // a2[2], a2[3]

"xvmaddadp 40, 54, 35 \n\t"
"addi %8, %8, 32 \n\t"
"xvmaddadp 41, 55, 35 \n\t"

"stxvd2x 40, 0, %2 \n\t" // y0, y1
"stxvd2x 41,%4, %2 \n\t" // y2, y3

"lxvd2x 54, 0, %9 \n\t" // a3[0], a3[1]
"lxvd2x 55,%4, %9 \n\t" // a3[2], a3[3]

"addi %9, %9, 32 \n\t"
"addi %2, %2, 32 \n\t"

"addic. %0 , %0 , -4 \n\t"
"ble 2f \n\t"


"lxvd2x 40, 0, %2 \n\t" // y0, y1
"lxvd2x 41,%4, %2 \n\t" // y2, y3
"xvmaddadp 40, 48, 32 \n\t"
"xvmaddadp 41, 49, 32 \n\t"

"lxvd2x 48, 0, %6 \n\t" // a0[0], a0[1]
"lxvd2x 49,%4, %6 \n\t" // a0[2], a0[3]

"xvmaddadp 40, 50, 33 \n\t"
"addi %6, %6, 32 \n\t"
"xvmaddadp 41, 51, 33 \n\t"

"lxvd2x 50, 0, %7 \n\t" // a1[0], a1[1]
"lxvd2x 51,%4, %7 \n\t" // a1[2], a1[3]

"xvmaddadp 40, 52, 34 \n\t"
"addi %7, %7, 32 \n\t"
"xvmaddadp 41, 53, 34 \n\t"

"lxvd2x 52, 0, %8 \n\t" // a2[0], a2[1]
"lxvd2x 53,%4, %8 \n\t" // a2[2], a2[3]

"xvmaddadp 40, 54, 35 \n\t"
"addi %8, %8, 32 \n\t"
"xvmaddadp 41, 55, 35 \n\t"

"stxvd2x 40, 0, %2 \n\t" // y0, y1
"stxvd2x 41,%4, %2 \n\t" // y2, y3

"lxvd2x 54, 0, %9 \n\t" // a3[0], a3[1]
"lxvd2x 55,%4, %9 \n\t" // a3[2], a3[3]

"addi %9, %9, 32 \n\t"
"addi %2, %2, 32 \n\t"

"addic. %0 , %0 , -4 \n\t"
"ble 2f \n\t"


"lxvd2x 40, 0, %2 \n\t" // y0, y1
"lxvd2x 41,%4, %2 \n\t" // y2, y3
"xvmaddadp 40, 48, 32 \n\t"
"xvmaddadp 41, 49, 32 \n\t"

"lxvd2x 48, 0, %6 \n\t" // a0[0], a0[1]
"lxvd2x 49,%4, %6 \n\t" // a0[2], a0[3]

"xvmaddadp 40, 50, 33 \n\t"
"addi %6, %6, 32 \n\t"
"xvmaddadp 41, 51, 33 \n\t"

"lxvd2x 50, 0, %7 \n\t" // a1[0], a1[1]
"lxvd2x 51,%4, %7 \n\t" // a1[2], a1[3]

"xvmaddadp 40, 52, 34 \n\t"
"addi %7, %7, 32 \n\t"
"xvmaddadp 41, 53, 34 \n\t"

"lxvd2x 52, 0, %8 \n\t" // a2[0], a2[1]
"lxvd2x 53,%4, %8 \n\t" // a2[2], a2[3]

"xvmaddadp 40, 54, 35 \n\t"
"addi %8, %8, 32 \n\t"
"xvmaddadp 41, 55, 35 \n\t"

"stxvd2x 40, 0, %2 \n\t" // y0, y1
"stxvd2x 41,%4, %2 \n\t" // y2, y3

"lxvd2x 54, 0, %9 \n\t" // a3[0], a3[1]
"lxvd2x 55,%4, %9 \n\t" // a3[2], a3[3]

"addi %9, %9, 32 \n\t"
"addi %2, %2, 32 \n\t"

"addic. %0 , %0 , -4 \n\t"
"bgt 1b \n\t"

"2: \n\t"

"lxvd2x 40, 0, %2 \n\t" // y0, y1
"lxvd2x 41,%4, %2 \n\t" // y2, y3

"xvmaddadp 40, 48, 32 \n\t"
"xvmaddadp 41, 49, 32 \n\t"

"xvmaddadp 40, 50, 33 \n\t"
"xvmaddadp 41, 51, 33 \n\t"

"xvmaddadp 40, 52, 34 \n\t"
"xvmaddadp 41, 53, 34 \n\t"

"xvmaddadp 40, 54, 35 \n\t"
"xvmaddadp 41, 55, 35 \n\t"

"stxvd2x 40, 0, %2 \n\t" // y0, y1
"stxvd2x 41,%4, %2 \n\t" // y2, y3

:
:
"r" (i), // 0
"r" (x), // 1
"r" (y1), // 2
"r" (o8), // 3
"r" (o16), // 4
"r" (o24), // 5
"r" (a0), // 6
"r" (a1), // 7
"r" (a2), // 8
"r" (a3), // 9
"r" (pre) // 10
: "cr0", "%0", "%2" , "%6", "%7", "%8", "%9", "memory"
);

}



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