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manual: Clarify undefined behavior of feenableexcept (BZ 31019) 

Explain undefined behavior of feenableexcept in a special case.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Bruno Haible 2023-11-01 02:10:11 +01:00 committed by Adhemerval Zanella
parent 787282dede
commit e55599e028
1 changed files with 6 additions and 0 deletions
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manual/arith.texi
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@ -1176,6 +1176,12 @@ enabled, the status of the other exceptions is not changed.
The function returns the previous enabled exceptions in case the The function returns the previous enabled exceptions in case the
operation was successful, @code{-1} otherwise. operation was successful, @code{-1} otherwise.
Note: Enabling traps for an exception for which the exception flag is
currently already set (@pxref{Status bit operations}) has unspecified
consequences: it may or may not trigger a trap immediately.
@c It triggers a trap immediately on powerpc*, at the next floating-
@c instruction on i386, and not at all on the other CPUs.
@end deftypefun @end deftypefun
@deftypefun int fedisableexcept (int @var{excepts}) @deftypefun int fedisableexcept (int @var{excepts})