OpenBLAS/kernel/power/cdot.c

/*Copyright (c) 2013-201\n8, The OpenBLAS Project
All rights reserved.
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 *****************************************************************************/

#include "common.h"

#ifndef HAVE_KERNEL_8
#include <altivec.h> 
static void cdot_kernel_8(BLASLONG n, FLOAT *x, FLOAT *y, float *dot)
{
    __vector unsigned char swap_mask = { 4,5,6,7,0,1,2,3, 12,13,14,15, 8,9,10,11};
    register __vector float *vy = (__vector float *) y;
    register __vector float *vx = (__vector float *) x;
    BLASLONG i = 0;
    register __vector float vd_0  = { 0 };
    register __vector float vd_1  = { 0 };
    register __vector float vd_2  = { 0 };
    register __vector float vd_3  = { 0 };
    register __vector float vdd_0 = { 0 };
    register __vector float vdd_1 = { 0 };
    register __vector float vdd_2 = { 0 };
    register __vector float vdd_3 = { 0 };
    for (; i < n/2; i += 4) {

        register __vector float vyy_0 ;
        register __vector float vyy_1 ;
        register __vector float vyy_2 ;
        register __vector float vyy_3 ;

        register __vector float vy_0 = vy[i];
        register __vector float vy_1 = vy[i + 1];
        register __vector float vy_2 = vy[i + 2];
        register __vector float vy_3 = vy[i + 3]; 
        register __vector float vx_0= vx[i];
        register __vector float vx_1 = vx[i + 1];
        register __vector float vx_2 = vx[i + 2];
        register __vector float vx_3 = vx[i + 3]; 
        vyy_0 = vec_perm(vy_0, vy_0, swap_mask);
        vyy_1 = vec_perm(vy_1, vy_1, swap_mask);
        vyy_2 = vec_perm(vy_2, vy_2, swap_mask);
        vyy_3 = vec_perm(vy_3, vy_3, swap_mask);  

        vd_0 += vx_0 * vy_0;
        vd_1 += vx_1 * vy_1;
        vd_2 += vx_2 * vy_2;
        vd_3 += vx_3 * vy_3;

        vdd_0 += vx_0 * vyy_0;
        vdd_1 += vx_1 * vyy_1;
        vdd_2 += vx_2 * vyy_2;
        vdd_3 += vx_3 * vyy_3;       
       

    }
    //aggregate
    vd_0 = vd_0 + vd_1 +vd_2 +vd_3;
    vdd_0= vdd_0 + vdd_1 +vdd_2 +vdd_3; 
     //reverse and aggregate 
    vd_1=vec_xxpermdi(vd_0,vd_0,2)  ;
    vdd_1=vec_xxpermdi(vdd_0,vdd_0,2);
    vd_2=vd_0+vd_1;
    vdd_2=vdd_0+vdd_1;

    dot[0]=vd_2[0];
    dot[1]=vd_2[1];
    dot[2]=vdd_2[0];
    dot[3]=vdd_2[1];
 
}
#endif
 

OPENBLAS_COMPLEX_FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y) {
    BLASLONG i = 0;
    BLASLONG ix=0, iy=0;
    OPENBLAS_COMPLEX_FLOAT result;
    FLOAT dot[4] __attribute__ ((aligned(16))) = {0.0, 0.0, 0.0, 0.0};

    if (n <= 0) {
        CREAL(result) = 0.0;
        CIMAG(result) = 0.0;
        return (result);

    }

    if ((inc_x == 1) && (inc_y == 1)) {

        BLASLONG n1 = n & -8;
        BLASLONG j=0; 

        if (n1){
            cdot_kernel_8(n1, x, y, dot);
            i = n1;
            j = n1 <<1;
        }
 

        while (i < n) {

            dot[0] += x[j] * y[j];
            dot[1] += x[j + 1] * y[j + 1];
            dot[2] += x[j] * y[j + 1];
            dot[3] += x[j + 1] * y[j];

            j += 2;
            i++;

        }


    } else {
        i = 0;
        ix = 0;
        iy = 0;
        inc_x <<= 1;
        inc_y <<= 1;
        while (i < n) {

            dot[0] += x[ix] * y[iy];
            dot[1] += x[ix + 1] * y[iy + 1];
            dot[2] += x[ix] * y[iy + 1];
            dot[3] += x[ix + 1] * y[iy];

            ix += inc_x;
            iy += inc_y;
            i++;

        }
    }

#if !defined(CONJ)
    CREAL(result) = dot[0] - dot[1];
    CIMAG(result) = dot[2] + dot[3];
#else
    CREAL(result) = dot[0] + dot[1];
    CIMAG(result) = dot[2] - dot[3];

#endif

    return (result);

}