OpenBLAS/kernel/x86_64/zscal.c

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/*
 * Avoid contraction of floating point operations, specifically fused
 * multiply-add, because they can cause unexpected results in complex
 * multiplication.
 */
#if defined(__GNUC__) && !defined(__clang__)
#pragma GCC optimize ("fp-contract=off")
#endif

#if defined(__clang__)
#pragma clang fp contract(off)
#endif

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

#if defined (SKYLAKEX) || defined (COOPERLAKE) || defined (SAPPHIRERAPIDS)
#include "zscal_microk_skylakex-2.c"
#elif defined(HASWELL) || defined(ZEN)
#include "zscal_microk_haswell-2.c"
#elif defined(BULLDOZER)  || defined(PILEDRIVER)
#include "zscal_microk_bulldozer-2.c"
#elif defined(STEAMROLLER)  || defined(EXCAVATOR)
#include "zscal_microk_steamroller-2.c"
#endif


#if !defined(HAVE_KERNEL_8)

static void zscal_kernel_8( BLASLONG n, FLOAT *alpha , FLOAT *x )  __attribute__ ((noinline));
static void zscal_kernel_8_zero( BLASLONG n, FLOAT *alpha , FLOAT *x )  __attribute__ ((noinline));
static void zscal_kernel_8_zero_r( BLASLONG n, FLOAT *alpha , FLOAT *x )  __attribute__ ((noinline));
static void zscal_kernel_8_zero_i( BLASLONG n, FLOAT *alpha , FLOAT *x )  __attribute__ ((noinline));

static void zscal_kernel_8( BLASLONG n, FLOAT *alpha , FLOAT *x )
{

	BLASLONG i;
	FLOAT da_r = alpha[0];
	FLOAT da_i = alpha[1];
	FLOAT t0,t1,t2,t3;

	for( i=0; i<n; i+=4 )
	{
		t0 = da_r *x[0] - da_i *x[1];
		t1 = da_r *x[2] - da_i *x[3];
		t2 = da_r *x[4] - da_i *x[5];
		t3 = da_r *x[6] - da_i *x[7];

		x[1] = da_r * x[1] + da_i * x[0];
		x[3] = da_r * x[3] + da_i * x[2];
		x[5] = da_r * x[5] + da_i * x[4];
		x[7] = da_r * x[7] + da_i * x[6];

		x[0] = t0;
		x[2] = t1;
		x[4] = t2;
		x[6] = t3;

		x+=8;
	}

}


static void zscal_kernel_8_zero_r( BLASLONG n, FLOAT *alpha , FLOAT *x )
{

	BLASLONG i;
	FLOAT da_i = alpha[1];
	FLOAT t0,t1,t2,t3;

	for( i=0; i<n; i+=4 )
	{
		t0 =  - da_i *x[1];
		t1 =  - da_i *x[3];
		t2 =  - da_i *x[5];
		t3 =  - da_i *x[7];

		x[1] =  da_i * x[0];
		x[3] =  da_i * x[2];
		x[5] =  da_i * x[4];
		x[7] =  da_i * x[6];

		x[0] = t0;
		x[2] = t1;
		x[4] = t2;
		x[6] = t3;

		x+=8;
	}

}


static void zscal_kernel_8_zero_i( BLASLONG n, FLOAT *alpha , FLOAT *x )
{

	BLASLONG i;
	FLOAT da_r = alpha[0];
	FLOAT t0,t1,t2,t3;

	for( i=0; i<n; i+=4 )
	{
		t0 = da_r *x[0];
		t1 = da_r *x[2];
		t2 = da_r *x[4];
		t3 = da_r *x[6];

		x[1] = da_r * x[1];
		x[3] = da_r * x[3];
		x[5] = da_r * x[5];
		x[7] = da_r * x[7];

		x[0] = t0;
		x[2] = t1;
		x[4] = t2;
		x[6] = t3;

		x+=8;
	}

}



static void zscal_kernel_8_zero( BLASLONG n, FLOAT *alpha , FLOAT *x )
{

	BLASLONG i;
	for( i=0; i<n; i+=4 )
	{
		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 zscal_kernel_inc_8(BLASLONG n, FLOAT *alpha, FLOAT *x, BLASLONG inc_x)  __attribute__ ((noinline));

static void zscal_kernel_inc_8(BLASLONG n, FLOAT *alpha, FLOAT *x, BLASLONG inc_x)
{

	BLASLONG i;
	BLASLONG inc_x2 = 2 * inc_x;
	BLASLONG inc_x3 = inc_x2 + inc_x;
	FLOAT t0,t1,t2,t3;
	FLOAT da_r = alpha[0];
	FLOAT da_i = alpha[1];

	for ( i=0; i<n; i+=4 )
	{
		t0 = da_r * x[0]         - da_i *x[1];
		t1 = da_r * x[inc_x]     - da_i *x[inc_x  + 1];
		t2 = da_r * x[inc_x2]    - da_i *x[inc_x2 + 1];
		t3 = da_r * x[inc_x3]    - da_i *x[inc_x3 + 1];

		x[1]               = da_i * x[0]       + da_r * x[1];
		x[inc_x  +1]       = da_i * x[inc_x]   + da_r * x[inc_x  +1];
		x[inc_x2 +1]       = da_i * x[inc_x2]  + da_r * x[inc_x2 +1];
		x[inc_x3 +1]       = da_i * x[inc_x3]  + da_r * x[inc_x3 +1];

		x[0]        = t0;
		x[inc_x]    = t1;
		x[inc_x2]   = t2;
		x[inc_x3]   = t3;

		x+=4*inc_x;

	}


}


int CNAME(BLASLONG n, BLASLONG dummy0, BLASLONG dummy1, FLOAT da_r, FLOAT da_i, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y, FLOAT *dummy, BLASLONG dummy2)
{
	BLASLONG i=0,j=0;
	FLOAT temp0;
	FLOAT temp1;
	FLOAT alpha[2];

	if ( inc_x != 1 )
	{
		inc_x <<= 1;

		if ( da_r == 0.0 )
		{
			BLASLONG n1 = n & -2;

			if ( da_i == 0.0 )
			{
				while(j < n1)
				{

					x[i]=0.0;
					x[i+1]=0.0;
					x[i+inc_x]=0.0;
					x[i+1+inc_x]=0.0;
					i += 2*inc_x ;
					j+=2;

				}

				while(j < n)
				{

					x[i]=0.0;
					x[i+1]=0.0;
					i += inc_x ;
					j++;

				}

			}
			else
			{
				while(j < n1)
				{

					if (isnan(x[i]) || isinf(x[i]))
						temp0	= NAN;
					else
						temp0   = -da_i * x[i+1];
					if (!isinf(x[i+1]))
						x[i+1]  = da_i * x[i];
					else    x[i+1]	= NAN;     
					x[i]         =  temp0;
					if (isnan(x[i+inc_x]) || isinf(x[i+inc_x]))
						temp1	= NAN;
					else
						temp1   = -da_i * x[i+1+inc_x];
					if (!isinf(x[i+1+inc_x]))
						x[i+1+inc_x] = da_i * x[i+inc_x];
					else    x[i+1+inc_x] = NAN;
					x[i+inc_x]   =  temp1;
					i += 2*inc_x ;
					j+=2;

				}

				while(j < n)
				{

					if (isnan(x[i]) || isinf(x[i]))
						temp0	= NAN;
					else
						temp0   = -da_i * x[i+1];
					if (!isinf(x[i+1]))
						x[i+1]       =  da_i * x[i];
					else x[i+1] = NAN;
					x[i]         =  temp0;
					i += inc_x ;
					j++;

				}



			}

		}
		else
		{


			if ( da_i == 0.0 )
			{
				BLASLONG n1 = n & -2;

				while(j < n1)
				{

					temp0        =  da_r * x[i];
					x[i+1]       =  da_r * x[i+1];
					x[i]         =  temp0;
					temp1        =  da_r * x[i+inc_x];
					x[i+1+inc_x] =  da_r * x[i+1+inc_x];
					x[i+inc_x]   =  temp1;
					i += 2*inc_x ;
					j+=2;

				}

				while(j < n)
				{

					temp0        =  da_r * x[i];
					x[i+1]       =  da_r * x[i+1];
					x[i]         =  temp0;
					i += inc_x ;
					j++;

				}

			}
			else
			{

				BLASLONG n1 = n & -8;
				if ( n1 > 0 )
				{
					alpha[0] = da_r;
			                alpha[1] = da_i;
					zscal_kernel_inc_8(n1, alpha, x, inc_x);
					j = n1 ;
					i = n1 * inc_x;
				}

				while(j < n)
				{

					temp0        =  da_r * x[i]   - da_i * x[i+1];
					x[i+1]       =  da_r * x[i+1] + da_i * x[i];
					x[i]         =  temp0;
					i += inc_x ;
					j++;

				}

			}

		}

		return(0);
	}


	BLASLONG n1 = n & -8;
	if ( n1 > 0 )
	{

		alpha[0] = da_r;
		alpha[1] = da_i;

		if ( da_r == 0.0 )
			if ( da_i == 0 )
				zscal_kernel_8_zero(n1 , alpha , x);
			else
//				zscal_kernel_8_zero_r(n1 , alpha , x);
				zscal_kernel_8(n1 , alpha , x);
		else
			if ( da_i == 0 && da_r == da_r)
				zscal_kernel_8_zero_i(n1 , alpha , x);
			else
				zscal_kernel_8(n1 , alpha , x);
		}
		i = n1 << 1;
		j = n1;

	if ( da_r == 0.0 || da_r != da_r )
	{
		if ( da_i == 0.0 )
		{
		FLOAT res=0.0;
		if (da_r != da_r) res= da_r;
			while(j < n)
			{
					x[i]=res;
					x[i+1]=res;
					i += 2 ;
					j++;

			}

		}
		else if (isinf(da_r)) {
			while(j < n)
			{
					x[i]= NAN;
					x[i+1] = da_r;
					i += 2 ;
					j++;

			}

		} else
		{

			while(j < n)
			{
				temp0        = -da_i * x[i+1];
				if (isinf(x[i]))
					temp0 = NAN;
				if (!isinf(x[i+1]))
					x[i+1]       =  da_i * x[i];
				else x[i+1] = NAN;
				if ( x[i] == x[i]) //preserve NaN
				  x[i]         =  temp0;
				i += 2 ;
				j++;

			}

		}

	}
	else
	{
		if (da_i == 0.0)
		{
				while(j < n)
				{

					temp0        =  da_r * x[i];
					x[i+1]       =  da_r * x[i+1];
					x[i]         =  temp0;
					i += 2 ;
					j++;

				}
		}
		else
		{

			while(j < n)
			{
				temp0        =  da_r * x[i]   - da_i * x[i+1];
				x[i+1]       =  da_r * x[i+1] + da_i * x[i];
				x[i]         =  temp0;
				i += 2 ;
				j++;

			}

		}

	}

	return(0);
}