OpenBLAS/interface/zsbmv.c

/*********************************************************************/
/* Copyright 2009, 2010 The University of Texas at Austin.           */
/* All rights reserved.                                              */
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/* Redistribution and use in source and binary forms, with or        */
/* without modification, are permitted provided that the following   */
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/*      copyright notice, this list of conditions and the following  */
/*      disclaimer.                                                  */
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/*   2. Redistributions in binary form must reproduce the above      */
/*      copyright notice, this list of conditions and the following  */
/*      disclaimer in the documentation and/or other materials       */
/*      provided with the distribution.                              */
/*                                                                   */
/*    THIS  SOFTWARE IS PROVIDED  BY THE  UNIVERSITY OF  TEXAS AT    */
/*    AUSTIN  ``AS IS''  AND ANY  EXPRESS OR  IMPLIED WARRANTIES,    */
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/*********************************************************************/

#include <stdio.h>
#include <ctype.h>
#include "common.h"
#ifdef FUNCTION_PROFILE
#include "functable.h"
#endif

#ifdef XDOUBLE
#define ERROR_NAME "XSBMV "
#elif defined(DOUBLE)
#define ERROR_NAME "ZSBMV "
#else
#define ERROR_NAME "CSBMV "
#endif

static  int (*sbmv[])(BLASLONG, BLASLONG, FLOAT, FLOAT, FLOAT *, BLASLONG, FLOAT *, BLASLONG, FLOAT *, BLASLONG, void *) = {
#ifdef XDOUBLE
  xsbmv_U, xsbmv_L,
#elif defined(DOUBLE)
  zsbmv_U, zsbmv_L,
#else
  csbmv_U, csbmv_L,
#endif
};

#ifdef SMPBUG
static  int (*sbmv_thread[])(BLASLONG, BLASLONG, FLOAT *, FLOAT *, BLASLONG, FLOAT *, BLASLONG, FLOAT *, BLASLONG, FLOAT *, int) = {
#ifdef XDOUBLE
  xsbmv_thread_U, xsbmv_thread_L,
#elif defined(DOUBLE)
  zsbmv_thread_U, zsbmv_thread_L,
#else
  csbmv_thread_U, csbmv_thread_L,
#endif
};
#endif

void NAME(char *UPLO, blasint *N, blasint *K, FLOAT  *ALPHA, FLOAT *a, blasint *LDA, 
            FLOAT  *b, blasint *INCX, FLOAT *BETA, FLOAT *c, blasint *INCY){

  char uplo_arg = *UPLO;
  blasint n	= *N;
  blasint k	= *K;
  FLOAT alpha_r	= ALPHA[0];
  FLOAT alpha_i	= ALPHA[1];
  blasint lda	= *LDA;
  blasint incx	= *INCX;
  FLOAT beta_r	= BETA[0];
  FLOAT beta_i	= BETA[1];
  blasint incy	= *INCY;

  blasint info;
  int uplo;
  FLOAT *buffer;
#ifdef SMPBUG
  int nthreads;
#endif

  PRINT_DEBUG_NAME;

  TOUPPER(uplo_arg);
  uplo  = -1;

  if (uplo_arg  == 'U') uplo  = 0;
  if (uplo_arg  == 'L') uplo  = 1;
 
  info = 0;

  if (incy == 0)          info = 11;
  if (incx == 0)          info =  8;
  if (lda  < k + 1)       info =  6;
  if (k < 0)              info =  3;
  if (n < 0)              info =  2;
  if (uplo  < 0)          info =  1;

  if (info != 0) {
    BLASFUNC(xerbla)(ERROR_NAME, &info, sizeof(ERROR_NAME));
    return;
  }
  
  if (n == 0) return;

  if ((beta_r != ONE) || (beta_i != ZERO)) SCAL_K(n, 0, 0, beta_r, beta_i, c, abs(incy), NULL, 0, NULL, 0);

  if ((alpha_r == ZERO) && (alpha_i == ZERO)) return;

  IDEBUG_START;
  
  FUNCTION_PROFILE_START();

  if (incx < 0 ) b -= (n - 1) * incx * COMPSIZE;
  if (incy < 0 ) c -= (n - 1) * incy * COMPSIZE;

  buffer = (FLOAT *)blas_memory_alloc(1);

#ifdef SMPBUG
  nthreads = num_cpu_avail(2);

  if (nthreads == 1) {
#endif

  (sbmv[uplo])(n, k, alpha_r, alpha_i, a, lda, b, incx, c, incy, buffer);

#ifdef SMPBUG
  } else {

    (sbmv_thread[uplo])(n, k, ALPHA, a, lda, b, incx, c, incy, buffer, nthreads);

  }
#endif

  blas_memory_free(buffer);

  FUNCTION_PROFILE_END(4, n * k / 2 + n, n * k);

  IDEBUG_END;

  return;
}