NAME

       dlamch.f -

SYNOPSIS

   Functions/Subroutines
       double precision function dlamch (CMACH)
           DLAMCH
       double precision function dlamc3 (A, B)
           DLAMC3

Function/Subroutine Documentation

   double precision function dlamc3 (double precisionA, double precisionB)
       DLAMC3 Purpose:

        DLAMC3  is intended to force  A  and  B  to be stored prior to doing
        the addition of  A  and  B ,  for use in situations where optimizers
        might hold one of these in a register.

       Author:
           LAPACK is a software package provided by Univ. of Tennessee, Univ. of California
           Berkeley, Univ. of Colorado Denver and NAG Ltd..

       Date:
           November 2011

       Parameters:
           A

                     A is a DOUBLE PRECISION

           B

                     B is a DOUBLE PRECISION
                     The values A and B.

       Definition at line 172 of file dlamch.f.

   double precision function dlamch (characterCMACH)
       DLAMCH

       Purpose:

            DLAMCH determines double precision machine parameters.

       Parameters:
           CMACH

                     Specifies the value to be returned by DLAMCH:
                     = 'E' or 'e',   DLAMCH := eps
                     = 'S' or 's ,   DLAMCH := sfmin
                     = 'B' or 'b',   DLAMCH := base
                     = 'P' or 'p',   DLAMCH := eps*base
                     = 'N' or 'n',   DLAMCH := t
                     = 'R' or 'r',   DLAMCH := rnd
                     = 'M' or 'm',   DLAMCH := emin
                     = 'U' or 'u',   DLAMCH := rmin
                     = 'L' or 'l',   DLAMCH := emax
                     = 'O' or 'o',   DLAMCH := rmax
                     where
                     eps   = relative machine precision
                     sfmin = safe minimum, such that 1/sfmin does not overflow
                     base  = base of the machine
                     prec  = eps*base
                     t     = number of (base) digits in the mantissa
                     rnd   = 1.0 when rounding occurs in addition, 0.0 otherwise
                     emin  = minimum exponent before (gradual) underflow
                     rmin  = underflow threshold - base**(emin-1)
                     emax  = largest exponent before overflow
                     rmax  = overflow threshold  - (base**emax)*(1-eps)

       Author:
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

       Date:
           November 2011

       Definition at line 64 of file dlamch.f.

Author

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