/***************************************************************************
Copyright (c) 2015, The OpenBLAS Project
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its contributors may be used to endorse or promote products
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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*****************************************************************************/

#include "common.h"

#if (defined(OS_DARWIN) || defined(OS_WINDOWS)) && (defined(__GNUC__) && __GNUC__ > 11) 
#pragma GCC optimize("no-tree-vectorize")
#endif

#if defined(BULLDOZER) 
#include "zdot_microk_bulldozer-2.c"
#elif defined(STEAMROLLER) || defined(PILEDRIVER) || defined(EXCAVATOR)
#include "zdot_microk_steamroller-2.c"
#elif defined(HASWELL) || defined(ZEN) || defined (SKYLAKEX) || defined (COOPERLAKE) || defined (SAPPHIRERAPIDS)
#include "zdot_microk_haswell-2.c"
#elif defined(SANDYBRIDGE)
#include "zdot_microk_sandy-2.c"
#endif


#ifndef HAVE_KERNEL_8

static void zdot_kernel_8(BLASLONG n, FLOAT *x, FLOAT *y, FLOAT *d) __attribute__ ((noinline));

static void zdot_kernel_8(BLASLONG n, FLOAT *x, FLOAT *y, FLOAT *d)
{
	BLASLONG register i = 0;
	FLOAT dot[4] = { 0.0, 0.0, 0.0, 0.0 };
	BLASLONG j=0;

	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]   ;

            dot[0] += x[j+2] * y[j+2] ;
            dot[1] += x[j+3] * y[j+3] ;
            dot[2] += x[j+2] * y[j+3] ;
            dot[3] += x[j+3] * y[j+2] ;

            dot[0] += x[j+4] * y[j+4] ;
            dot[1] += x[j+5] * y[j+5] ;
            dot[2] += x[j+4] * y[j+5] ;
            dot[3] += x[j+5] * y[j+4] ;

            dot[0] += x[j+6] * y[j+6] ;
            dot[1] += x[j+7] * y[j+7] ;
            dot[2] += x[j+6] * y[j+7] ;
            dot[3] += x[j+7] * y[j+6] ;

	    j+=8;
            i+=4;

        }
	d[0] = dot[0];
	d[1] = dot[1];
	d[2] = dot[2];
	d[3] = dot[3];

}

#endif


#if defined(SMP)
extern int blas_level1_thread_with_return_value(int mode, BLASLONG m, BLASLONG n,
        BLASLONG k, void *alpha, void *a, BLASLONG lda, void *b, BLASLONG ldb,
        void *c, BLASLONG ldc, int (*function)(), int nthreads);
#endif
                
                

static void zdot_compute (BLASLONG n, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y,OPENBLAS_COMPLEX_FLOAT *result)
{
	BLASLONG i;
	BLASLONG ix,iy;
	FLOAT  dot[4] = { 0.0, 0.0, 0.0 , 0.0 } ; 
	
	if ( n <= 0 ) 
	{
		OPENBLAS_COMPLEX_FLOAT res=OPENBLAS_MAKE_COMPLEX_FLOAT(0.0,0.0);
		*result=res;
		return;

	}

	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 *= 2;
		inc_y *= 2;
		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)
	OPENBLAS_COMPLEX_FLOAT res=OPENBLAS_MAKE_COMPLEX_FLOAT(dot[0]-dot[1],dot[2]+dot[3]);
#else
	OPENBLAS_COMPLEX_FLOAT res=OPENBLAS_MAKE_COMPLEX_FLOAT(dot[0]+dot[1],dot[2]-dot[3]);
#endif
        *result=res;
	return;
}

#if defined(SMP)
static int zdot_thread_function(BLASLONG n, BLASLONG dummy0,
BLASLONG dummy1, FLOAT dummy2r, FLOAT dummy2i, FLOAT *x, BLASLONG inc_x, FLOAT *y,
BLASLONG inc_y, FLOAT *result, BLASLONG dummy3)
{
        zdot_compute(n, x, inc_x, y, inc_y, (void *)result);
        return 0;
}
#endif

OPENBLAS_COMPLEX_FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y)
{
#if defined(SMP)
	int nthreads;
	FLOAT dummy_alpha;
#if defined(C_PGI) || defined(C_SUN)	
	FLOAT zdotr=0., zdoti=0.;
#endif	
#endif
	
	OPENBLAS_COMPLEX_FLOAT zdot;
#if defined(C_PGI) || defined(C_SUN)	
        zdot=OPENBLAS_MAKE_COMPLEX_FLOAT(0.0,0.0);
#else
	CREAL(zdot) = 0.0;
	CIMAG(zdot) = 0.0;
#endif
	
#if defined(SMP)
	if (inc_x == 0 || inc_y == 0 || n <= 10000)
		nthreads = 1;
	else
		nthreads = num_cpu_avail(1);

	if (nthreads == 1) {
		zdot_compute(n, x, inc_x, y, inc_y, &zdot);
	} else {
		int mode, i;
		char result[MAX_CPU_NUMBER * sizeof(double) * 2];
		OPENBLAS_COMPLEX_FLOAT *ptr;

#if !defined(DOUBLE)
		mode = BLAS_SINGLE  | BLAS_COMPLEX;
#else
		mode = BLAS_DOUBLE  | BLAS_COMPLEX;
#endif

		blas_level1_thread_with_return_value(mode, n, 0, 0, &dummy_alpha,
				   x, inc_x, y, inc_y, result, 0,
				   (int (*)(void))zdot_thread_function, nthreads);

		ptr = (OPENBLAS_COMPLEX_FLOAT *)result;
		for (i = 0; i < nthreads; i++) {
#if defined(C_PGI) || defined(C_SUN)			
			zdotr += CREAL(*ptr);
			zdoti += CIMAG(*ptr);
#else			
			CREAL(zdot) = CREAL(zdot) + CREAL(*ptr);
			CIMAG(zdot) = CIMAG(zdot) + CIMAG(*ptr);
#endif
			ptr = (void *)(((char *)ptr) + sizeof(double) * 2);
		}
#if defined(C_PGI) || defined(C_SUN)		
	zdot = OPENBLAS_MAKE_COMPLEX_FLOAT(zdotr,zdoti);
#endif
	}
#else
	zdot_compute(n, x, inc_x, y, inc_y, &zdot);
#endif
	
	return zdot;
}

