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slamch.f(3) | LAPACK | slamch.f(3) |
NAME¶
slamch.f -SYNOPSIS¶
Functions/Subroutines¶
real function slamch (CMACH)
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
Definition at line 171 of file slamch.f.
B
The values A and B.
real function slamch (characterCMACH)¶
SLAMCH Purpose:SLAMCH determines single precision machine parameters.
CMACH
Author:
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)
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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