http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57219
Bug #: 57219
Summary: __builtin_isinf_sign source comments more restrictive
than documentation
Classification: Unclassified
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: trivial
Priority: P3
Component: other
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: jtaylor.deb...@gmail.com
in glibc bug [0] it is discussed to use __builtin_isinf_sign for C99 isinf.
The source code and the patch mail [1] for __builtin_isinf_sign document that
it returns -1, 0 or 1 as glibc isinf does.
The gcc documentation on the other hand only says it returns the sign of the
infinity.
To avoid confusion it would be good if the source code comment or the
documentation could be matched up to say the exact same thing.
Either that the value of the return is undefined (but keeps sign) or that it is
strictly define.
[0] http://sourceware.org/bugzilla/show_bug.cgi?id=15367
[1] http://gcc.gnu.org/ml/gcc-patches/2008-05/msg01067.html
