INSTALL/slamch.f(3)

NAME
INSTALL/slamch.f

SYNOPSIS

  Functions/Subroutines
real function slamch (cmach)
SLAMCH
real function slamc3 (a, b)
SLAMC3

Function/Subroutine Documentation

  real function slamc3 (real a, real b)

SLAMC3 Purpose:

!> SLAMC3  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..

Parameters
    A

    !>

    B

    !>          The values A and B.
    !>

Definition at line 170 of file slamch.f.

  real function slamch (character cmach)

SLAMCH

Purpose:

    !>
    !> SLAMCH determines single precision machine parameters.
    !>

Parameters
    CMACH

    !>          CMACH is CHARACTER*1
    !>          Specifies the value to be returned by SLAMCH:
    !>          = 'E' or 'e',   SLAMCH := eps
    !>          = 'S' or 's ,   SLAMCH := sfmin
    !>          = 'B' or 'b',   SLAMCH := base
    !>          = 'P' or 'p',   SLAMCH := eps*base
    !>          = 'N' or 'n',   SLAMCH := t
    !>          = 'R' or 'r',   SLAMCH := rnd
    !>          = 'M' or 'm',   SLAMCH := emin
    !>          = 'U' or 'u',   SLAMCH := rmin
    !>          = 'L' or 'l',   SLAMCH := emax
    !>          = 'O' or 'o',   SLAMCH := 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.

Definition at line 67 of file slamch.f.

Author

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