OpenBLAS/kernel/x86_64/dscal.c

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#include "common.h"

#if defined(BULLDOZER) || defined(PILEDRIVER) || defined(STEAMROLLER) || defined(EXCAVATOR)
#include "dscal_microk_bulldozer-2.c"
#elif defined(SANDYBRIDGE)
#include "dscal_microk_sandy-2.c"
#elif defined(HASWELL) || defined(ZEN)
#include "dscal_microk_haswell-2.c"
#elif  defined (SKYLAKEX) || defined (COOPERLAKE) || defined (SAPPHIRERAPIDS)
#include "dscal_microk_skylakex-2.c"
#endif


#if !defined(HAVE_KERNEL_8)

static void dscal_kernel_8( BLASLONG n, FLOAT *da , FLOAT *x )
{

    BLASLONG i;
    FLOAT alpha = *da;

    for( i=0; i<n; i+=8 )
    {
        x[0] *= alpha;
        x[1] *= alpha;
        x[2] *= alpha;
        x[3] *= alpha;
        x[4] *= alpha;
        x[5] *= alpha;
        x[6] *= alpha;
        x[7] *= alpha;
        x+=8;
    }

}


static void dscal_kernel_8_zero( BLASLONG n, FLOAT *alpha , FLOAT *x )
{

    BLASLONG i;
    for( i=0; i<n; i+=8 )
    {
        x[0] = 0.0;
        x[1] = 0.0;
        x[2] = 0.0;
        x[3] = 0.0;
        x[4] = 0.0;
        x[5] = 0.0;
        x[6] = 0.0;
        x[7] = 0.0;
        x+=8;
    }

}

#endif


static void dscal_kernel_inc_8(BLASLONG n, FLOAT *alpha, FLOAT *x, BLASLONG inc_x)  __attribute__ ((noinline));

static void dscal_kernel_inc_8(BLASLONG n, FLOAT *alpha, FLOAT *x, BLASLONG inc_x)
{

    FLOAT *x1=NULL;
    BLASLONG inc_x3;

    inc_x <<= 3;
    inc_x3 = (inc_x << 1) + inc_x;

        __asm__  __volatile__
        (
        "movddup (%3),      %%xmm0              \n\t"  // alpha

        "leaq    (%1,%4,4), %2                  \n\t"

        ".p2align 4                             \n\t"

        "1:                                     \n\t"
        "movsd  (%1)     , %%xmm4               \n\t"
        "movhpd (%1,%4,1), %%xmm4               \n\t"
        "movsd  (%1,%4,2), %%xmm5               \n\t"
        "movhpd (%1,%5,1), %%xmm5               \n\t"

        "movsd  (%2)     , %%xmm6               \n\t"
        "movhpd (%2,%4,1), %%xmm6               \n\t"
        "movsd  (%2,%4,2), %%xmm7               \n\t"
        "movhpd (%2,%5,1), %%xmm7               \n\t"

        "mulpd  %%xmm0, %%xmm4                  \n\t"
        "mulpd  %%xmm0, %%xmm5                  \n\t"
        "mulpd  %%xmm0, %%xmm6                  \n\t"
        "mulpd  %%xmm0, %%xmm7                  \n\t"

        "movsd  %%xmm4 , (%1)                   \n\t"
        "movhpd %%xmm4 , (%1,%4,1)              \n\t"
        "movsd  %%xmm5 , (%1,%4,2)              \n\t"
        "movhpd %%xmm5 , (%1,%5,1)              \n\t"

        "movsd  %%xmm6 , (%2)                   \n\t"
        "movhpd %%xmm6 , (%2,%4,1)              \n\t"
        "movsd  %%xmm7 , (%2,%4,2)              \n\t"
        "movhpd %%xmm7 , (%2,%5,1)              \n\t"

        "leaq   (%1,%4,8), %1                   \n\t"
        "leaq   (%2,%4,8), %2                   \n\t"

        "subq   $8, %0                          \n\t"
        "jnz    1b                              \n\t"

        :
          "+r" (n),     // 0
          "+r" (x),     // 1
          "+r" (x1)     // 2
        :
          "r" (alpha),  // 3
          "r" (inc_x),  // 4
          "r" (inc_x3)  // 5
        : "cc", //"%0", "%1", "%2",
          "%xmm0", "%xmm1", "%xmm2", "%xmm3",
          "%xmm4", "%xmm5", "%xmm6", "%xmm7",
          "%xmm8", "%xmm9", "%xmm10", "%xmm11",
          "%xmm12", "%xmm13", "%xmm14", "%xmm15",
          "memory"
        );
}

int CNAME(BLASLONG n, BLASLONG dummy0, BLASLONG dummy1, FLOAT da, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y, FLOAT *dummy, BLASLONG dummy2)
{
    BLASLONG i = 0, j = 0;

    // Resolved issue 4728 when the caller is dscal
    if (dummy2 == 1 && da == 0.0)
    {
        if ( inc_x != 1 )
        {
            BLASLONG n1 = n & -8;
            if ( n1 > 0 )
            {
                dscal_kernel_inc_8(n1, &da, x, inc_x);
                i = n1 * inc_x;
                j = n1;
            }
            while(j < n)
            {
                x[i] *= da;
                i += inc_x ;
                j++;
            }
        }
        else
        {
            BLASLONG n1 = n & -8;
            if ( n1 > 0)
                dscal_kernel_8(n1 , &da , x);
            for ( i = n1 ; i < n; i++ )
                x[i] *= da;
        }
    }
    else
    {
        if ( inc_x != 1 )
        {
            if( da == 0.0)
            {
                BLASLONG n1 = n & -2;
                while(j < n1)
                {
                    x[i] = 0.0;
                    x[i+inc_x] = 0.0;
                    i += 2 * inc_x ;
                    j += 2;
                }
                while(j < n)
                {
                    x[i] = 0.0;
                    i += inc_x ;
                    j++;
                }
            }
            else
            {
                BLASLONG n1 = n & -8;
                if ( n1 > 0 )
                {
                    dscal_kernel_inc_8(n1, &da, x, inc_x);
                    i = n1 * inc_x;
                    j = n1;
                }
                while(j < n)
                {
                    x[i] *= da;
                    i += inc_x ;
                    j++;
                }
            }
        }
        else
        {
            if ( da == 0.0 )
            {
                BLASLONG n1 = n & -8;
                if ( n1 > 0)
                   dscal_kernel_8_zero(n1, &da, x);
                for ( i = n1 ; i < n; i++ )
                    x[i] = 0.0;
            }
            else
            {
                BLASLONG n1 = n & -8;
                if ( n1 > 0)
                    dscal_kernel_8(n1 , &da , x);
                for ( i = n1 ; i < n; i++ )
                    x[i] *= da;
            }
        }
    }
}