On 2018-08-10 14:43, Houder wrote:
On Fri, 10 Aug 2018 13:42:54, Corinna Vinschen wrote:
[snip]
> Note: the following line must be changed in STC-FENV.c (the STC that was
> attached to the bug report -- the last one above).
>
> from:
> const int xxx =3D 0x3d; // FE_ALL_EXCEPT on Linux, i.e. the denormal-...
> // exception is excluded on Linux
>
> to:
> const int xxx =3D 0x3f; // Cygwin allows the denormal-operand exception;
> // Linux (Andreas Jaeger) does not.
> // This exception is not defined by the IEEE 754
> // standard (Floating-Point Arithmetic)
Shall we change that? A patch would be nice. ;)
That is possible ...
As on Linux, the denormal-operand exception will always be masked after
this
change ... (both in the default env. and in the "nomask" env.)
Meaning that, after this change, this exception can * no longer * be
enabled
through the API of fenv.h
Objections? Anyone?
The modication would require changing:
winsup/cygwin/fenv.cc (_feinitialise() )
winsup/cygwin/include/fenv.h (FE_ALL_EXCEPT)
/usr/include/fenv.h (which is a copy of the above, I am guessing ?????)
Stupid question:
Does the modification of winsup/cygwin/include/fenv.h "automatically"
propogate
to /usr/include/fenv.h
Said differently, does "your" machinery (build) take care of that?
Regards,
Henri
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