slamch.f (3)  Linux Manuals
NAME
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
BThe 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**(emin1) emax = largest exponent before overflow rmax = overflow threshold  (base**emax)*(1eps)
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
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