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From: "joseph at codesourcery dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/53805] combine_comparisons changes trapping behavior
Date: Fri, 29 Jun 2012 14:43:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53805

--- Comment #6 from joseph at codesourcery dot com <joseph at codesourcery dot com> 2012-06-29 14:43:30 UTC ---
On Fri, 29 Jun 2012, rguenth at gcc dot gnu.org wrote:

> We happily remove dead trapping statements:
> 
> void foo(double x, int y)
> {
>   1 / x;

Bug with -ftrapping-math.  Maybe a known bug - there are plenty of open 
bugs for ways in which -ftrapping-math -frounding-math fail to implement 
standard C semantics - but a bug.

>   1 / y;

Arguably a bug with -ftrapv (again, the option could reasonably be split 
into different cases), but not otherwise.