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FP (IEEE) exception trapping for Win2K (Cygwin) & Pentium 4 ?
From: |
Lionel B |
Subject: |
FP (IEEE) exception trapping for Win2K (Cygwin) & Pentium 4 ? |
Date: |
23 Sep 2004 06:53:27 -0700 |
Greetings,
Using gcc (GCC) 3.3.3 (cygwin special) on Win2K, Pentium 4
Is it possible to enable FP (IEEE) exception trapping for Win2K,
Pentium 4 ?
(What I would really like to be able to do is to throw a C++ exception
when a FP exception is raised, and the only way I can think of doing
that is to trap FP exceptions and handle the SIGFPE signal).
I note that for some architectures gcc has flags to enable FP
exception traps (e.g. -mfp-trap-mode for DEC ALPHA), but no such flags
seem to exist for i386.
On a related point, I find that passing -mfpmath=sse to gcc on my
architecture seems to disable the raising of FP exceptions; i.e.
fetestexcept() always returns 0, even when it ought not to. Anyone
come across this?
Grateful for any assistance,
--
Lionel B
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