OpenBLAS/kernel/x86_64/dscal.c

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#include "common.h"

#if defined(BULLDOZER) || defined(PILEDRIVER) || defined(STEAMROLLER)
#include "dscal_microk_bulldozer-2.c"
#elif defined(SANDYBRIDGE)
#include "dscal_microk_sandy-2.c"
#elif defined(HASWELL)
#include "dscal_microk_haswell-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"

        ".align 16                                          \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;

	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++;

			}

		}

		return(0);
	}

	BLASLONG n1 = n & -8;
	if ( n1 > 0 )
	{
		if ( da == 0.0 )
			dscal_kernel_8_zero(n1 , &da , x);
		else
			dscal_kernel_8(n1 , &da , x);
	}

	if ( da == 0.0 )
	{
		for ( i=n1 ; i<n; i++ )
		{
			x[i] = 0.0;
		}
	}
	else
	{

		for ( i=n1 ; i<n; i++ )
		{
			x[i] *= da;
		}
	}
	return(0);
}