[Openmcl-devel] Floating point exceptions on Windows
martin.lisp at gmail.com
Sun May 3 08:18:55 PDT 2009
I am using CCL 1.3-r11949 on Windows XP SP2 and have a problem with
floating point exception propagation.
Now, I have a file app1.c with a function with the following code extract:
__declspec(dllexport) double fn1 ()
double zero = 0;
I compiled it into a DLL (Using MS Visual C++ 2005 Express Edition) with
the following command:
cl /LD app1.c
to yield app1.dll.
Using it in CCL:
Welcome to Clozure Common Lisp Version 1.3-r11949M (WindowsX8632)!
? (open-shared-library "D:/studies/floats/app1/app1.dll")
#<SHLIB app1.dll #x89DED5E>
? (ff-call (%reference-external-entry-point (external "fn1")) :double-float)
? (log 10)
> Error: DIVISION-BY-ZERO detected
> performing LOG on (10.0)
> While executing: CCL::%FP-ERROR-FROM-STATUS, in process listener(1).
> Type :POP to abort, :R for a list of available restarts.
> Type :? for other options.
1. Is there a way that to can get the error signaled on the offending
statement rather than being propagated to the next?
2. How can I disable floating point exceptions from within CCL?
(To put the problem in context, let me mention that I encountered a
problem along these lines while trying to create a wrapper for the
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