87 lines
2.1 KiB
Fortran
87 lines
2.1 KiB
Fortran
*> \brief \b SROUNDUP_LWORK
|
|
*
|
|
* =========== DOCUMENTATION ===========
|
|
*
|
|
* Online html documentation available at
|
|
* http://www.netlib.org/lapack/explore-html/
|
|
*
|
|
* Definition:
|
|
* ===========
|
|
*
|
|
* REAL FUNCTION SROUNDUP_LWORK( LWORK )
|
|
*
|
|
* .. Scalar Arguments ..
|
|
* INTEGER LWORK
|
|
* ..
|
|
*
|
|
*
|
|
*> \par Purpose:
|
|
* =============
|
|
*>
|
|
*> \verbatim
|
|
*>
|
|
*> SROUNDUP_LWORK deals with a subtle bug with returning LWORK as a Float.
|
|
*> This routine guarantees it is rounded up instead of down by
|
|
*> multiplying LWORK by 1+eps when it is necessary, where eps is the relative machine precision.
|
|
*> E.g.,
|
|
*>
|
|
*> float( 16777217 ) == 16777216
|
|
*> float( 16777217 ) * (1.+eps) == 16777218
|
|
*>
|
|
*> \return SROUNDUP_LWORK
|
|
*> \verbatim
|
|
*> SROUNDUP_LWORK >= LWORK.
|
|
*> SROUNDUP_LWORK is guaranteed to have zero decimal part.
|
|
*> \endverbatim
|
|
*
|
|
* Arguments:
|
|
* ==========
|
|
*
|
|
*> \param[in] LWORK Workspace size.
|
|
*
|
|
* Authors:
|
|
* ========
|
|
*
|
|
*> \author Weslley Pereira, University of Colorado Denver, USA
|
|
*
|
|
*> \ingroup auxOTHERauxiliary
|
|
*
|
|
*> \par Further Details:
|
|
* =====================
|
|
*>
|
|
*> \verbatim
|
|
*> This routine was inspired in the method `magma_zmake_lwork` from MAGMA.
|
|
*> \see https://bitbucket.org/icl/magma/src/master/control/magma_zauxiliary.cpp
|
|
*> \endverbatim
|
|
*
|
|
* =====================================================================
|
|
REAL FUNCTION SROUNDUP_LWORK( LWORK )
|
|
*
|
|
* -- LAPACK auxiliary routine --
|
|
* -- LAPACK is a software package provided by Univ. of Tennessee, --
|
|
* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
|
|
*
|
|
* .. Scalar Arguments ..
|
|
INTEGER LWORK
|
|
* ..
|
|
*
|
|
* =====================================================================
|
|
* ..
|
|
* .. Intrinsic Functions ..
|
|
INTRINSIC EPSILON, REAL, INT
|
|
* ..
|
|
* .. Executable Statements ..
|
|
* ..
|
|
SROUNDUP_LWORK = REAL( LWORK )
|
|
*
|
|
IF( INT( SROUNDUP_LWORK ) .LT. LWORK ) THEN
|
|
* Force round up of LWORK
|
|
SROUNDUP_LWORK = SROUNDUP_LWORK * ( 1.0E+0 + EPSILON(0.0E+0) )
|
|
ENDIF
|
|
*
|
|
RETURN
|
|
*
|
|
* End of SROUNDUP_LWORK
|
|
*
|
|
END
|