OpenBLAS/interface/trtri.c

/*********************************************************************/
/* Copyright 2009, 2010 The University of Texas at Austin.           */
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/*********************************************************************/

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

#ifdef XDOUBLE
#define ERROR_NAME "QTRTRI"
#elif defined(DOUBLE)
#define ERROR_NAME "DTRTRI"
#else
#define ERROR_NAME "STRTRI"
#endif

static blasint (*trtri_single[])(blas_arg_t *, BLASLONG *, BLASLONG *, FLOAT *, FLOAT *, BLASLONG) ={
  TRTRI_UU_SINGLE, TRTRI_UN_SINGLE, TRTRI_LU_SINGLE, TRTRI_LN_SINGLE,
};

#ifdef SMP
static blasint (*trtri_parallel[])(blas_arg_t *, BLASLONG *, BLASLONG *, FLOAT *, FLOAT *, BLASLONG) ={
  TRTRI_UU_PARALLEL, TRTRI_UN_PARALLEL, TRTRI_LU_PARALLEL, TRTRI_LN_PARALLEL,
};
#endif

extern void BLASFUNC(dtrtrilapack)(char *UPLO, char *DIAG, int *N, double *a, int *ldA, int *Info);

int NAME(char *UPLO, char *DIAG, blasint *N, FLOAT *a, blasint *ldA, blasint *Info){

  blas_arg_t args;

  blasint uplo_arg = *UPLO;
  blasint diag_arg = *DIAG;
  blasint uplo, diag;
  blasint info;
  FLOAT *buffer;
#ifdef PPC440
  extern
#endif
  FLOAT *sa, *sb;
  
  PRINT_DEBUG_NAME;

  args.n    = *N;
  args.a    = (void *)a;
  args.lda  = *ldA;

  TOUPPER(uplo_arg);
  TOUPPER(diag_arg);


  uplo = -1;
  if (uplo_arg == 'U') uplo = 0;
  if (uplo_arg == 'L') uplo = 1;
  diag = -1;
  if (diag_arg == 'U') diag = 0;
  if (diag_arg == 'N') diag = 1;


  info  = 0;
  if (args.lda  < MAX(1,args.n)) info = 5;
  if (args.n    < 0)             info = 3; 
  if (diag < 0)                  info = 2;
  if (uplo < 0)                  info = 1;
  if (info) {
    BLASFUNC(xerbla)(ERROR_NAME, &info, sizeof(ERROR_NAME));
    *Info = - info;
    return 0;
  }

  *Info = 0;

  if (args.n == 0) return 0;
  
  if (diag) {
    if (AMIN_K(args.n, args.a, args.lda + 1) == ZERO) {
      *Info = IAMIN_K(args.n, args.a, args.lda + 1);
      return 0;
    }
  }

  IDEBUG_START;

  FUNCTION_PROFILE_START();

#ifndef PPC440
  buffer = (FLOAT *)blas_memory_alloc(1);

  sa = (FLOAT *)((BLASLONG)buffer + GEMM_OFFSET_A);
  sb = (FLOAT *)(((BLASLONG)sa + ((GEMM_P * GEMM_Q * COMPSIZE * SIZE + GEMM_ALIGN) & ~GEMM_ALIGN)) + GEMM_OFFSET_B);
#endif

#ifdef SMP
  args.nthreads = num_cpu_avail(4);

  if (args.nthreads == 1) {
#endif

#if DOUBLE
    // double trtri_U single thread error
    // call dtrtri from lapack for a walk around.
    if(uplo==0){
      BLASFUNC(dtrtrilapack)(UPLO, DIAG, N, a, ldA, Info);
#ifndef PPC440
      blas_memory_free(buffer);
#endif
      return 0;
    }
#endif

    *Info = (trtri_single[(uplo << 1) | diag])(&args, NULL, NULL, sa, sb, 0);
    
#ifdef SMP
  } else {

    *Info = (trtri_parallel[(uplo << 1) | diag])(&args, NULL, NULL, sa, sb, 0);
   
  }
#endif

#ifndef PPC440
  blas_memory_free(buffer);
#endif

  FUNCTION_PROFILE_END(COMPSIZE * COMPSIZE, .5 * args.n * args.n,
		          args.n * (1./3. + args.n * ( 1./2. + args.n * 1./6.))
		       +  args.n * (1./3. + args.n * (-1./2. + args.n * 1./6.)));

  IDEBUG_END;

  return 0;
}