OpenBLAS/kernel/mips/ddot_msa.c

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#include "common.h"
#include "macros_msa.h"

FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y)
{
    BLASLONG i = 0;
    FLOAT dot = 0.0;
    FLOAT x0, x1, x2, x3, y0, y1, y2, y3;
    v2f64 vx0, vx1, vx2, vx3, vx4, vx5, vx6, vx7;
    v2f64 vy0, vy1, vy2, vy3, vy4, vy5, vy6, vy7;
    v2f64 dot0 = {0, 0};
    v2f64 dot1 = {0, 0};
    v2f64 dot2 = {0, 0};
    v2f64 dot3 = {0, 0};

    if (n < 1) return (dot);

    if ((1 == inc_x) && (1 == inc_y))
    {
        FLOAT *x_pref, *y_pref;
        BLASLONG pref_offset;

        pref_offset = (BLASLONG)x & (L1_DATA_LINESIZE - 1);
        if (pref_offset > 0)
        {
            pref_offset = L1_DATA_LINESIZE - pref_offset;
            pref_offset = pref_offset / sizeof(FLOAT);
        }
        x_pref = x + pref_offset + 32;

        pref_offset = (BLASLONG)y & (L1_DATA_LINESIZE - 1);
        if (pref_offset > 0)
        {
            pref_offset = L1_DATA_LINESIZE - pref_offset;
            pref_offset = pref_offset / sizeof(FLOAT);
        }
        y_pref = y + pref_offset + 32;

        for (i = (n >> 4); i--;)
        {
            LD_DP8_INC(x, 2, vx0, vx1, vx2, vx3, vx4, vx5, vx6, vx7);
            LD_DP8_INC(y, 2, vy0, vy1, vy2, vy3, vy4, vy5, vy6, vy7);

            PREF_OFFSET(x_pref, 0);
            PREF_OFFSET(x_pref, 32);
            PREF_OFFSET(x_pref, 64);
            PREF_OFFSET(x_pref, 96);
            PREF_OFFSET(y_pref, 0);
            PREF_OFFSET(y_pref, 32);
            PREF_OFFSET(y_pref, 64);
            PREF_OFFSET(y_pref, 96);
            x_pref += 16;
            y_pref += 16;

            dot0 += (vy0 * vx0);
            dot1 += (vy1 * vx1);
            dot2 += (vy2 * vx2);
            dot3 += (vy3 * vx3);
            dot0 += (vy4 * vx4);
            dot1 += (vy5 * vx5);
            dot2 += (vy6 * vx6);
            dot3 += (vy7 * vx7);
        }

        if (n & 15)
        {
            if (n & 8)
            {
                LD_DP4_INC(x, 2, vx0, vx1, vx2, vx3);
                LD_DP4_INC(y, 2, vy0, vy1, vy2, vy3);

                dot0 += (vy0 * vx0);
                dot1 += (vy1 * vx1);
                dot2 += (vy2 * vx2);
                dot3 += (vy3 * vx3);
            }

            if (n & 4)
            {
                LD_DP2_INC(x, 2, vx0, vx1);
                LD_DP2_INC(y, 2, vy0, vy1);

                dot0 += (vy0 * vx0);
                dot1 += (vy1 * vx1);
            }

            if (n & 2)
            {
                vx0 = LD_DP(x); x += 2;
                vy0 = LD_DP(y); y += 2;

                dot0 += (vy0 * vx0);
            }

            if (n & 1)
            {
                x0 = *x;
                y0 = *y;

                dot += (y0 * x0);
            }
        }

        dot0 += dot1 + dot2 + dot3;

        dot += dot0[0];
        dot += dot0[1];
    }
    else
    {
        for (i = (n >> 2); i--;)
        {
            LD_GP4_INC(x, inc_x, x0, x1, x2, x3);
            LD_GP4_INC(y, inc_y, y0, y1, y2, y3);

            dot += (y0 * x0);
            dot += (y1 * x1);
            dot += (y2 * x2);
            dot += (y3 * x3);
        }

        if (n & 2)
        {
            LD_GP2_INC(x, inc_x, x0, x1);
            LD_GP2_INC(y, inc_y, y0, y1);

            dot += (y0 * x0);
            dot += (y1 * x1);
        }

        if (n & 1)
        {
            x0 = *x;
            y0 = *y;

            dot += (y0 * x0);
        }
    }

    return (dot);
}