[Bug fortran/32980] Vendor extension: Intrinsic functions (D)GAMMA, LGAMMA (ALGAMA/DLGAMA)

burnus at gcc dot gnu dot org gcc-bugzilla@gcc.gnu.org
Tue Aug 21 17:08:00 GMT 2007



------- Comment #4 from burnus at gcc dot gnu dot org  2007-08-21 17:08 -------
Created an attachment (id=14091)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=14091&action=view)
invoke.texi patch

Note: I did not mention "Fortran 2008" and I also did not include "LOG_GAMMA"
(F2008 name of "LGAMMA").

LGAMMA: lgamma,lgammaf,lgammal are part of C99.
GAMMA: "gamma" is a vendor extension, but C99 has the "true Gamma function":
tgamma, tgammaf, tgammal.
(Contrary to Fortran, C allows all values but returns NaN (neg.int.) or +/-INF
(+/-0) for values excluded in Fortran.)

As the functions are part of C99, gcc offers these as BUILD_IN_*.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32980



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