OpenBLAS/kernel/zarch/zdot.c

/***************************************************************************
Copyright (c) 2013-2017, The OpenBLAS Project
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*****************************************************************************/

#include "common.h"

static void zdot_kernel_8(BLASLONG n, FLOAT *x, FLOAT *y, FLOAT *d)
{
    __asm__ volatile(
        "vzero %%v24                       \n\t"
        "vzero %%v25                       \n\t"
        "vzero %%v26                       \n\t"
        "vzero %%v27                       \n\t"
        "vzero %%v28                       \n\t"
        "vzero %%v29                       \n\t"
        "vzero %%v30                       \n\t"
        "vzero %%v31                       \n\t"
        "srlg %%r0,%0,3                    \n\t"
        "xgr %%r1,%%r1                     \n\t"
        "0:                                \n\t"
        "pfd 1, 1024(%%r1,%1)              \n\t"
        "pfd 1, 1024(%%r1,%2)              \n\t"

        "vl  %%v16,  0(%%r1,%1)            \n\t"
        "vl  %%v17, 16(%%r1,%1)            \n\t"
        "vl  %%v18, 32(%%r1,%1)            \n\t"
        "vl  %%v19, 48(%%r1,%1)            \n\t"
        "vl  %%v0,  0(%%r1,%2)             \n\t"
        "vl  %%v1, 16(%%r1,%2)             \n\t"
        "vl  %%v2, 32(%%r1,%2)             \n\t"
        "vl  %%v3, 48(%%r1,%2)             \n\t"
        "vpdi %%v20,%%v16,%%v16,4          \n\t"
        "vpdi %%v21,%%v17,%%v17,4          \n\t"
        "vpdi %%v22,%%v18,%%v18,4          \n\t"
        "vpdi %%v23,%%v19,%%v19,4          \n\t"

        "vfmadb    %%v24,%%v16,%%v0,%%v24  \n\t"
        "vfmadb    %%v25,%%v20,%%v0,%%v25  \n\t"
        "vfmadb    %%v26,%%v17,%%v1,%%v26  \n\t"
        "vfmadb    %%v27,%%v21,%%v1,%%v27  \n\t"
        "vfmadb    %%v28,%%v18,%%v2,%%v28  \n\t"
        "vfmadb    %%v29,%%v22,%%v2,%%v29  \n\t"
        "vfmadb    %%v30,%%v19,%%v3,%%v30  \n\t"
        "vfmadb    %%v31,%%v23,%%v3,%%v31  \n\t"

        "vl  %%v16, 64(%%r1,%1)            \n\t"
        "vl  %%v17, 80(%%r1,%1)            \n\t"
        "vl  %%v18, 96(%%r1,%1)            \n\t"
        "vl  %%v19, 112(%%r1,%1)           \n\t"
        "vl  %%v0, 64(%%r1,%2)             \n\t"
        "vl  %%v1, 80(%%r1,%2)             \n\t"
        "vl  %%v2, 96(%%r1,%2)             \n\t"
        "vl  %%v3, 112(%%r1,%2)            \n\t"
        "vpdi %%v20,%%v16,%%v16,4          \n\t"
        "vpdi %%v21,%%v17,%%v17,4          \n\t"
        "vpdi %%v22,%%v18,%%v18,4          \n\t"
        "vpdi %%v23,%%v19,%%v19,4          \n\t"

        "vfmadb    %%v24,%%v16,%%v0,%%v24  \n\t"
        "vfmadb    %%v25,%%v20,%%v0,%%v25  \n\t"
        "vfmadb    %%v26,%%v17,%%v1,%%v26  \n\t"
        "vfmadb    %%v27,%%v21,%%v1,%%v27  \n\t"
        "vfmadb    %%v28,%%v18,%%v2,%%v28  \n\t"
        "vfmadb    %%v29,%%v22,%%v2,%%v29  \n\t"
        "vfmadb    %%v30,%%v19,%%v3,%%v30  \n\t"
        "vfmadb    %%v31,%%v23,%%v3,%%v31  \n\t"

        "agfi   %%r1,128                   \n\t"
        "brctg  %%r0,0b                    \n\t"
        "vfadb  %%v24,%%v24,%%v26          \n\t"
        "vfadb  %%v24,%%v24,%%v28          \n\t"
        "vfadb  %%v24,%%v24,%%v30          \n\t"
        "vfadb  %%v25,%%v25,%%v27          \n\t"
        "vfadb  %%v25,%%v25,%%v29          \n\t"
        "vfadb  %%v25,%%v25,%%v31          \n\t"
        "vsteg  %%v24,0(%3),0              \n\t"
        "vsteg  %%v24,8(%3),1              \n\t"
        "vsteg  %%v25,16(%3),1             \n\t"
        "vsteg  %%v25,24(%3),0                 "
        :
        :"r"(n),"ZR"((const FLOAT (*)[n * 2])x),"ZR"((const FLOAT (*)[n * 2])y),"ZQ"((FLOAT (*)[4])d)
        :"memory","cc","r0","r1","v0","v1","v2","v3","v16","v17","v18","v19","v20","v21","v22","v23","v24","v25","v26","v27","v28","v29","v30","v31"
    );
}

OPENBLAS_COMPLEX_FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y) {
    BLASLONG i;
    BLASLONG ix, iy;
    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;

        if (n1)
            zdot_kernel_8(n1, x, y, dot);

        i = n1;
        BLASLONG j = i * 2;

        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);

}