slamch.f man page

slamch.f —

Synopsis

Functions/Subroutines

REAL function slamch (CMACH)
SLAMCH
REAL function slamc3 (A, B)
SLAMC3

Function/Subroutine Documentation

REAL function slamc3 (realA, realB)

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..

Date:

November 2011

Parameters:

A

B

          The values A and B.

Definition at line 171 of file slamch.f.

REAL function slamch (characterCMACH)

SLAMCH Purpose:

 SLAMCH determines single precision machine parameters.
Parameters:

CMACH

          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.

Date:

November 2011

Definition at line 68 of file slamch.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.

Referenced By

slamc3(3) and slamch(3) are aliases of slamch.f(3).

Sat Nov 16 2013 Version 3.4.2 LAPACK