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IEEE 754 floating-point "exception" -> C++ exception

P: n/a
Greetings,

Using gcc (GCC) 3.3.3 (cygwin special) on Win2K

Does anyone know if there is a convenient mechanism to cause a C++
exception to be thrown whenever a IEEE 754 floating-point "exception"
is raised?

Currently I a check the FPU status word wherever I wish to test for FP
errors and throw a C++ exception accordingly. This is fine; but
(particularly for testing/debugging) it would be useful to be able to
trap FP errors _wherever_ they might ocurr.

The GNU libc documentation
http://www.gnu.org/software/libc/man...xceptions.html
states that it is possible to enable traps for FP exceptions such that
an FP exception generates a SIGFPE signal. One solution then might be
to define a handler for SIGFPE that throws an exception - however, I
suspect signal handlers and C++ exceptions may not play together
nicely... In any case neither the GNU libc documentation (nor gcc
docs) suggest how to enable FP trapping.

Any hints gratefully accepted,

--
Lionel B
Jul 22 '05 #1
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