[Bug tree-optimization/35202] [4.1/4.2/4.3 Regression] exp->expf transformation incorrect with -fmath-errno

[joseph at codesourcery dot com]

------- Comment #2 from joseph at codesourcery dot com  2008-02-14 23:09 -------
Subject: Re:  [4.1/4.2/4.3 Regression] exp->expf
 transformation incorrect with -fmath-errno

On Thu, 14 Feb 2008, rguenth at gcc dot gnu dot org wrote:

> Clarification would be much appreciated here, and I would like to effectively
> make our default (-ferrno-math -ftrapping-math) be changed to
> -fno-errno-math -ftrapping-math and providing math_errhandling ==
> MATH_ERREXCEPT
> by GCC, overriding the library.

Allowing this (not setting errno in certain cases) is an incompatible 
quiet change in C99 relative to C90, so I'm not convinced it's a good idea 
even in C99 mode.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35202