--- rpl/lapack/lapack/ieeeck.f 2010/01/26 15:22:46 1.1.1.1 +++ rpl/lapack/lapack/ieeeck.f 2012/08/22 09:48:28 1.12 @@ -1,43 +1,98 @@ +*> \brief \b IEEECK +* +* =========== DOCUMENTATION =========== +* +* Online html documentation available at +* http://www.netlib.org/lapack/explore-html/ +* +*> \htmlonly +*> Download IEEECK + dependencies +*> +*> [TGZ] +*> +*> [ZIP] +*> +*> [TXT] +*> \endhtmlonly +* +* Definition: +* =========== +* +* INTEGER FUNCTION IEEECK( ISPEC, ZERO, ONE ) +* +* .. Scalar Arguments .. +* INTEGER ISPEC +* REAL ONE, ZERO +* .. +* +* +*> \par Purpose: +* ============= +*> +*> \verbatim +*> +*> IEEECK is called from the ILAENV to verify that Infinity and +*> possibly NaN arithmetic is safe (i.e. will not trap). +*> \endverbatim +* +* Arguments: +* ========== +* +*> \param[in] ISPEC +*> \verbatim +*> ISPEC is INTEGER +*> Specifies whether to test just for inifinity arithmetic +*> or whether to test for infinity and NaN arithmetic. +*> = 0: Verify infinity arithmetic only. +*> = 1: Verify infinity and NaN arithmetic. +*> \endverbatim +*> +*> \param[in] ZERO +*> \verbatim +*> ZERO is REAL +*> Must contain the value 0.0 +*> This is passed to prevent the compiler from optimizing +*> away this code. +*> \endverbatim +*> +*> \param[in] ONE +*> \verbatim +*> ONE is REAL +*> Must contain the value 1.0 +*> This is passed to prevent the compiler from optimizing +*> away this code. +*> +*> RETURN VALUE: INTEGER +*> = 0: Arithmetic failed to produce the correct answers +*> = 1: Arithmetic produced the correct answers +*> \endverbatim +* +* Authors: +* ======== +* +*> \author Univ. of Tennessee +*> \author Univ. of California Berkeley +*> \author Univ. of Colorado Denver +*> \author NAG Ltd. +* +*> \date November 2011 +* +*> \ingroup auxOTHERauxiliary +* +* ===================================================================== INTEGER FUNCTION IEEECK( ISPEC, ZERO, ONE ) * -* -- LAPACK auxiliary routine (version 3.2) -- +* -- LAPACK auxiliary routine (version 3.4.0) -- * -- LAPACK is a software package provided by Univ. of Tennessee, -- * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- -* November 2006 +* November 2011 * * .. Scalar Arguments .. INTEGER ISPEC REAL ONE, ZERO * .. * -* Purpose -* ======= -* -* IEEECK is called from the ILAENV to verify that Infinity and -* possibly NaN arithmetic is safe (i.e. will not trap). -* -* Arguments -* ========= -* -* ISPEC (input) INTEGER -* Specifies whether to test just for inifinity arithmetic -* or whether to test for infinity and NaN arithmetic. -* = 0: Verify infinity arithmetic only. -* = 1: Verify infinity and NaN arithmetic. -* -* ZERO (input) REAL -* Must contain the value 0.0 -* This is passed to prevent the compiler from optimizing -* away this code. -* -* ONE (input) REAL -* Must contain the value 1.0 -* This is passed to prevent the compiler from optimizing -* away this code. -* -* RETURN VALUE: INTEGER -* = 0: Arithmetic failed to produce the correct answers -* = 1: Arithmetic produced the correct answers +* ===================================================================== * * .. Local Scalars .. REAL NAN1, NAN2, NAN3, NAN4, NAN5, NAN6, NEGINF, @@ -112,7 +167,7 @@ * NAN5 = NEGINF*NEGZRO * - NAN6 = NAN5*0.0 + NAN6 = NAN5*ZERO * IF( NAN1.EQ.NAN1 ) THEN IEEECK = 0