NAME

       dlamchf77.f -

SYNOPSIS

   Functions/Subroutines
       double precision function dlamch (CMACH)
           DLAMCH
       subroutine dlamc1 (BETA, T, RND, IEEE1)
           DLAMC1
       subroutine dlamc2 (BETA, T, RND, EPS, EMIN, RMIN, EMAX, RMAX)
           DLAMC2
       double precision function dlamc3 (A, B)
           DLAMC3
       subroutine dlamc4 (EMIN, START, BASE)
           DLAMC4
       subroutine dlamc5 (BETA, P, EMIN, IEEE, EMAX, RMAX)
           DLAMC5

Function/Subroutine Documentation

   double precision function dlamc3 (double precision A, double precision B)
       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.

       Parameters:
           A
           B

                     The values A and B.

   subroutine dlamc4 (integer EMIN, double precision START, integer BASE)
       DLAMC4 Purpose:

        DLAMC4 is a service routine for DLAMC2.

       Parameters:
           EMIN

                     The minimum exponent before (gradual) underflow, computed by
                     setting A = START and dividing by BASE until the previous A
                     can not be recovered.

           START

                     The starting point for determining EMIN.

           BASE

                     The base of the machine.

   subroutine dlamc5 (integer BETA, integer P, integer EMIN, logical IEEE, integer EMAX, double
       precision RMAX)
       DLAMC5 Purpose:

        DLAMC5 attempts to compute RMAX, the largest machine floating-point
        number, without overflow.  It assumes that EMAX + abs(EMIN) sum
        approximately to a power of 2.  It will fail on machines where this
        assumption does not hold, for example, the Cyber 205 (EMIN = -28625,
        EMAX = 28718).  It will also fail if the value supplied for EMIN is
        too large (i.e. too close to zero), probably with overflow.

       Parameters:
           BETA

                     The base of floating-point arithmetic.

           P

                     The number of base BETA digits in the mantissa of a
                     floating-point value.

           EMIN

                     The minimum exponent before (gradual) underflow.

           IEEE

                     A logical flag specifying whether or not the arithmetic
                     system is thought to comply with the IEEE standard.

           EMAX

                     The largest exponent before overflow

           RMAX

                     The largest machine floating-point number.

Author

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