slamch.f(3) LAPACK slamch.f(3)
REAL function slamch (CMACH)
REAL function slamc3 (A, B)
REAL function slamc3 (realA, realB)
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.
LAPACK is a software package provided by Univ. of Tennessee, Univ. of California
Berkeley, Univ. of Colorado Denver and NAG Ltd..
The values A and B.
Definition at line 171 of file slamch.f.
REAL function slamch (characterCMACH)
SLAMCH determines single precision machine parameters.
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
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)
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
Definition at line 68 of file slamch.f.
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Version 3.4.2 Tue Sep 25 2012 slamch.f(3)