OpenBLAS/kernel/zarch/sasum.c

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#include "common.h"
#include <math.h>

#if defined(DOUBLE) 
#define ABS fabs 
#else 
#define ABS fabsf 
#endif

static FLOAT sasum_kernel_64(BLASLONG n, FLOAT *x)
{
    FLOAT asum;

    __asm__ (
        "vzero   %%v0               \n\t"
        "vzero   %%v1               \n\t"
        "vzero   %%v2               \n\t"
        "vzero   %%v3               \n\t"
        "srlg  %%r0,%1,6            \n\t"
        "xgr %%r1,%%r1              \n\t"
        "0:                         \n\t"
        "pfd  1, 1024(%%r1,%2)      \n\t"
        "vl  %%v16, 0(%%r1,%2)      \n\t"
        "vl  %%v17, 16(%%r1,%2)     \n\t"
        "vl  %%v18, 32(%%r1,%2)     \n\t"
        "vl  %%v19, 48(%%r1,%2)     \n\t"
        "vl  %%v20, 64(%%r1,%2)     \n\t"
        "vl  %%v21, 80(%%r1,%2)     \n\t"
        "vl  %%v22, 96(%%r1,%2)     \n\t"
        "vl  %%v23, 112(%%r1,%2)    \n\t"

        "vflpsb  %%v16, %%v16       \n\t"
        "vflpsb  %%v17, %%v17       \n\t"
        "vflpsb  %%v18, %%v18       \n\t"
        "vflpsb  %%v19, %%v19       \n\t"
        "vflpsb  %%v20, %%v20       \n\t"
        "vflpsb  %%v21, %%v21       \n\t"
        "vflpsb  %%v22, %%v22       \n\t"
        "vflpsb  %%v23, %%v23       \n\t"

        "vfasb   %%v0,%%v0,%%v16    \n\t"
        "vfasb   %%v1,%%v1,%%v17    \n\t"
        "vfasb   %%v2,%%v2,%%v18    \n\t"
        "vfasb   %%v3,%%v3,%%v19    \n\t"
        "vfasb   %%v0,%%v0,%%v20    \n\t"
        "vfasb   %%v1,%%v1,%%v21    \n\t"
        "vfasb   %%v2,%%v2,%%v22    \n\t"
        "vfasb   %%v3,%%v3,%%v23    \n\t"

        "vl  %%v16, 128(%%r1,%2)    \n\t"
        "vl  %%v17, 144(%%r1,%2)    \n\t"
        "vl  %%v18, 160(%%r1,%2)    \n\t"
        "vl  %%v19, 176(%%r1,%2)    \n\t"
        "vl  %%v20, 192(%%r1,%2)    \n\t"
        "vl  %%v21, 208(%%r1,%2)    \n\t"
        "vl  %%v22, 224(%%r1,%2)    \n\t"
        "vl  %%v23, 240(%%r1,%2)    \n\t"

        "vflpsb  %%v16, %%v16       \n\t"
        "vflpsb  %%v17, %%v17       \n\t"
        "vflpsb  %%v18, %%v18       \n\t"
        "vflpsb  %%v19, %%v19       \n\t"
        "vflpsb  %%v20, %%v20       \n\t"
        "vflpsb  %%v21, %%v21       \n\t"
        "vflpsb  %%v22, %%v22       \n\t"
        "vflpsb  %%v23, %%v23       \n\t"

        "vfasb   %%v0,%%v0,%%v16    \n\t"
        "vfasb   %%v1,%%v1,%%v17    \n\t"
        "vfasb   %%v2,%%v2,%%v18    \n\t"
        "vfasb   %%v3,%%v3,%%v19    \n\t"
        "vfasb   %%v0,%%v0,%%v20    \n\t"
        "vfasb   %%v1,%%v1,%%v21    \n\t"
        "vfasb   %%v2,%%v2,%%v22    \n\t"
        "vfasb   %%v3,%%v3,%%v23    \n\t"
        
        "agfi  %%r1,256             \n\t"
        "brctg %%r0,0b              \n\t"
        "vfasb   %%v0,%%v0,%%v1     \n\t"
        "vfasb   %%v0,%%v0,%%v2     \n\t"
        "vfasb   %%v0,%%v0,%%v3     \n\t"
        "veslg   %%v1,%%v0,32       \n\t"
        "vfasb   %%v0,%%v0,%%v1     \n\t"
        "vrepf   %%v1,%%v0,2        \n\t"
        "aebr    %%f0,%%f1          \n\t"
        "ler     %0,%%f0                "
        :"=f"(asum)
        :"r"(n),"ZR"((const FLOAT (*)[n])x)
        :"memory","cc","r0","r1","v0","v1","v2","v3","v16","v17","v18","v19","v20","v21","v22","v23"
    );

    return asum;
}

FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x) {
    BLASLONG i = 0;
    BLASLONG j = 0;
    FLOAT sumf = 0.0;
    BLASLONG n1;

    if (n <= 0 || inc_x <= 0) return sumf;

    if (inc_x == 1) {

        n1 = n & -64;
               
        if (n1 > 0) {

            sumf = sasum_kernel_64(n1, x);
            i = n1;
        }

        while (i < n) {
            sumf += ABS(x[i]);
            i++;
        }

    } else {
        BLASLONG n1 = n & -4;
        register FLOAT sum1, sum2;
        sum1 = 0.0;
        sum2 = 0.0;
        while (j < n1) {

            sum1 += ABS(x[i]);
            sum2 += ABS(x[i + inc_x]);
            sum1 += ABS(x[i + 2 * inc_x]);
            sum2 += ABS(x[i + 3 * inc_x]);

            i += inc_x * 4;
            j += 4;

        }
        sumf = sum1 + sum2;
        while (j < n) {

            sumf += ABS(x[i]);
            i += inc_x;
            j++;
        }


    }
    return sumf;
}