OpenBLAS/interface/trsv.c

/*********************************************************************/
/* Copyright 2009, 2010 The University of Texas at Austin.           */
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/*    THIS  SOFTWARE IS PROVIDED  BY THE  UNIVERSITY OF  TEXAS AT    */
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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 "QTRSV "
#elif defined(DOUBLE)
#define ERROR_NAME "DTRSV "
#else
#define ERROR_NAME "STRSV "
#endif

static int (*trsv[])(BLASLONG, FLOAT *, BLASLONG, FLOAT *, BLASLONG, void *) = {
#ifdef XDOUBLE
  qtrsv_NUU, qtrsv_NUN, qtrsv_NLU, qtrsv_NLN,
  qtrsv_TUU, qtrsv_TUN, qtrsv_TLU, qtrsv_TLN,
#elif defined(DOUBLE)
  dtrsv_NUU, dtrsv_NUN, dtrsv_NLU, dtrsv_NLN,
  dtrsv_TUU, dtrsv_TUN, dtrsv_TLU, dtrsv_TLN,
#else
  strsv_NUU, strsv_NUN, strsv_NLU, strsv_NLN,
  strsv_TUU, strsv_TUN, strsv_TLU, strsv_TLN,
#endif
};

#ifndef CBLAS

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

  char uplo_arg  = *UPLO;
  char trans_arg = *TRANS;
  char diag_arg  = *DIAG;

  blasint n    = *N;
  blasint lda  = *LDA;
  blasint incx = *INCX;

  blasint info;
  int uplo;
  int unit;
  int trans;
  FLOAT *buffer;

  PRINT_DEBUG_NAME;

  TOUPPER(uplo_arg);
  TOUPPER(trans_arg);
  TOUPPER(diag_arg);

  trans = -1;
  unit  = -1;
  uplo  = -1;

  if (trans_arg == 'N') trans = 0;
  if (trans_arg == 'T') trans = 1;
  if (trans_arg == 'R') trans = 0;
  if (trans_arg == 'C') trans = 1;

  if (diag_arg  == 'U') unit  = 0;
  if (diag_arg  == 'N') unit  = 1;

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

  info = 0;

  if (incx == 0)          info =  8;
  if (lda  < MAX(1, n))   info =  6;
  if (n < 0)              info =  4;
  if (unit  < 0)          info =  3;
  if (trans < 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,
	   enum CBLAS_TRANSPOSE TransA, enum CBLAS_DIAG Diag,
	   blasint n, FLOAT  *a, blasint lda, FLOAT  *x, blasint incx) {

  int trans, uplo, unit;
  blasint info;
  FLOAT *buffer;

  PRINT_DEBUG_CNAME;

  unit  = -1;
  uplo  = -1;
  trans = -1;
  info  =  0;

  if (order == CblasColMajor) {
    if (Uplo == CblasUpper)         uplo  = 0;
    if (Uplo == CblasLower)         uplo  = 1;

    if (TransA == CblasNoTrans)     trans = 0;
    if (TransA == CblasTrans)       trans = 1;
    if (TransA == CblasConjNoTrans) trans = 0;
    if (TransA == CblasConjTrans)   trans = 1;

    if (Diag == CblasUnit)          unit  = 0;
    if (Diag == CblasNonUnit)       unit  = 1;

    info = -1;

    if (incx == 0)          info =  8;
    if (lda  < MAX(1, n))   info =  6;
    if (n < 0)              info =  4;
    if (unit  < 0)          info =  3;
    if (trans < 0)          info =  2;
    if (uplo  < 0)          info =  1;
  }

  if (order == CblasRowMajor) {
    if (Uplo == CblasUpper)         uplo  = 1;
    if (Uplo == CblasLower)         uplo  = 0;

    if (TransA == CblasNoTrans)     trans = 1;
    if (TransA == CblasTrans)       trans = 0;
    if (TransA == CblasConjNoTrans) trans = 1;
    if (TransA == CblasConjTrans)   trans = 0;

    if (Diag == CblasUnit)          unit  = 0;
    if (Diag == CblasNonUnit)       unit  = 1;

    info = -1;

    if (incx == 0)          info =  8;
    if (lda  < MAX(1, n))   info =  6;
    if (n < 0)              info =  4;
    if (unit  < 0)          info =  3;
    if (trans < 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 (incx == 1 && trans == 0 && n < 50) {
    buffer = NULL;
    (trsv[(trans<<2) | (uplo<<1) | unit])(n, a, lda, x, incx, buffer);
    return;  
  }

  IDEBUG_START;

  FUNCTION_PROFILE_START();

  if (incx < 0 ) x -= (n - 1) * incx;

  buffer = (FLOAT *)blas_memory_alloc(1);

  (trsv[(trans<<2) | (uplo<<1) | unit])(n, a, lda, x, incx, buffer);

  blas_memory_free(buffer);

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

  IDEBUG_END;

  return;
}