OpenBLAS/interface/syr.c

/*********************************************************************/
/* Copyright 2009, 2010 The University of Texas at Austin.           */
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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 "QSYR  "
#elif defined(DOUBLE)
#define ERROR_NAME "DSYR  "
#else
#define ERROR_NAME "SSYR  "
#endif

static int (*syr[])(BLASLONG, FLOAT, FLOAT *, BLASLONG, FLOAT *, BLASLONG, FLOAT *) = {
#ifdef XDOUBLE
  qsyr_U, qsyr_L,
#elif defined(DOUBLE)
  dsyr_U, dsyr_L,
#else
  ssyr_U, ssyr_L,
#endif
};

#ifdef SMP
static int (*syr_thread[])(BLASLONG, FLOAT, FLOAT *, BLASLONG, FLOAT *, BLASLONG, FLOAT *, int) = {
#ifdef XDOUBLE
  qsyr_thread_U, qsyr_thread_L,
#elif defined(DOUBLE)
  dsyr_thread_U, dsyr_thread_L,
#else
  ssyr_thread_U, ssyr_thread_L,
#endif
};
#endif

#ifndef CBLAS

void NAME(char *UPLO, blasint *N, FLOAT  *ALPHA,
	 FLOAT  *x, blasint *INCX, FLOAT *a, blasint *LDA){

  char uplo_arg = *UPLO;
  blasint n		= *N;
  FLOAT alpha	= *ALPHA;
  blasint lda	= *LDA;
  blasint incx	= *INCX;

  blasint info;
  int uplo;
  FLOAT *buffer;
#ifdef SMP
  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 (lda  < MAX(1, n))   info =  7;
  if (incx == 0)          info =  5;
  if (n < 0)              info =  2;
  if (uplo  < 0)          info =  1;

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

#else

void CNAME(enum CBLAS_ORDER order, enum CBLAS_UPLO Uplo, blasint n, FLOAT alpha, FLOAT *x, blasint incx, FLOAT *a, blasint lda) {

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

  PRINT_DEBUG_CNAME;

  uplo  = -1;
  info  =  0;

  if (order == CblasColMajor) {

    if (Uplo == CblasUpper) uplo  = 0;
    if (Uplo == CblasLower) uplo  = 1;

    info = -1;

    if (lda  < MAX(1, n))   info =  7;
    if (incx == 0)          info =  5;
    if (n < 0)              info =  2;
    if (uplo  < 0)          info =  1;

  }

  if (order == CblasRowMajor) {

    if (Uplo == CblasUpper) uplo  = 1;
    if (Uplo == CblasLower) uplo  = 0;

    info = -1;

    if (lda  < MAX(1, n))   info =  7;
    if (incx == 0)          info =  5;
    if (n < 0)              info =  2;
    if (uplo  < 0)          info =  1;
  }

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

#endif

  if (n == 0) return;

  if (alpha == ZERO) return;

  IDEBUG_START;

  FUNCTION_PROFILE_START();
#if 1
  if (incx == 1 && n < 100) {
    BLASLONG i;

    if (uplo == 0) {
      for (i = 0; i < n; i++){
        if (x[i] != ZERO) {
          AXPYU_K(i + 1, 0, 0, alpha * x[i], x,     1, a, 1, NULL, 0);
        }
        a += lda;
      }  
    } else {
      for (i = 0; i < n; i++){
        if (x[i] != ZERO) {
          AXPYU_K(n - i, 0, 0, alpha * x[i], x + i, 1, a, 1, NULL, 0);
        }
        a += 1 + lda;
      }
    }
    return;
  } 
#endif
  if (incx < 0 ) x -= (n - 1) * incx;

  buffer = (FLOAT *)blas_memory_alloc(1);

#ifdef SMP
  nthreads = num_cpu_avail(2);

  if (nthreads == 1) {
#endif

  (syr[uplo])(n, alpha, x, incx, a, lda, buffer);

#ifdef SMP
  } else {

    (syr_thread[uplo])(n, alpha, x, incx, a, lda, buffer, nthreads);

  }
#endif

  blas_memory_free(buffer);

  FUNCTION_PROFILE_END(1, n * n / 2 + n, n * n);

  IDEBUG_END;

  return;
}