HP MLIB User's Guide Vol. 1 7th Ed.

172 HP MLIB User’s Guide
F_SFPINFO/F_DFPINFO Environmental inquiry
Name F_SFPINFO/F_DFPINFO
Environmental inquiry
Purpose F_xFPINFO queries for machine-specific floating point characteristics. For
BLAS Standard routines, error bounds and limitations due to overflow and
underflow depend on details of how floating point numbers are represented.
These details are available by calling F_xFPINFO.
Usage VECLIB:
INTEGER*4 CMACH
REAL*4 FUNCTION F_SFPINFO (CMACH)
INTEGER*4 CMACH
REAL*4 FUNCTION F_DFPINFO (CMACH)
VECLIB8:
INTEGER*8 CMACH
REAL*4 FUNCTION F_SFPINFO (CMACH)
INTEGER*8 CMACH
REAL*4 FUNCTION F_DFPINFO (CMACH)
Input CMACH
A named integer constant. The names for the CMACH
argument are given in the appropriate language’s
include file.
Table 2-1 describes the CMACH floating point
parameters, the corresponding BLAS Standard named
constant (from the Fortran 77 include file), and the
values returned by F_xFPINFO.