| Message ID | 20231106132713.953501-5-adhemerval.zanella@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | Multiple floating-point environment fixes | expand |
On 11/6/23 08:27, Adhemerval Zanella wrote: > From: Bruno Haible <bruno@clisp.org> > > Explain undefined behavior of feenableexcept in a special case. LGTM. Reviewed-by: Carlos O'Donell <carlos@redhat.com> > --- > manual/arith.texi | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/manual/arith.texi b/manual/arith.texi > index fa7110e992..be24c20493 100644 > --- a/manual/arith.texi > +++ b/manual/arith.texi > @@ -1176,6 +1176,12 @@ enabled, the status of the other exceptions is not changed. > > The function returns the previous enabled exceptions in case the > 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. Agreed. > +@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 > > @deftypefun int fedisableexcept (int @var{excepts})
diff --git a/manual/arith.texi b/manual/arith.texi index fa7110e992..be24c20493 100644 --- a/manual/arith.texi +++ b/manual/arith.texi @@ -1176,6 +1176,12 @@ enabled, the status of the other exceptions is not changed. The function returns the previous enabled exceptions in case the 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 @deftypefun int fedisableexcept (int @var{excepts})
From: Bruno Haible <bruno@clisp.org> Explain undefined behavior of feenableexcept in a special case. --- manual/arith.texi | 6 ++++++ 1 file changed, 6 insertions(+)