Package: libc6.1
Version: 2.2.5-11.5
Summary: Under some circumstances, invoking fesetenv() results
in a floating point exception being raised.
Description:
I have a piece of code which may result in underflows. I enclose
the code in between
fenv_t env;
feholdexcept(&env);
...
fesetenv(&env);
Now the code in [...] is reading floating point numbers which may
be very small and result in underflow floating point signals.
However, since we have used feholdexcept() the signals should not
be produced. And indeed they are not, until we reach fesetenv()
where the signal is raised.
If you read the manual of LIBC for fesetenv()
The fesetenv function restores the floating point environ-
ment from the object *envp. This object must be known to
be valid, e.g., the result of a call to fegetenv or
feholdexcept or equal to FE_DFL_ENV. This call does not
raise exceptions.
it says no exception should be raised.
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