[Bug tree-optimization/37449] [4.4 Regression] calculix gets wrong answer for -O1 -ffast-math

[dberlin at dberlin dot org]

------- Comment #18 from dberlin at gcc dot gnu dot org  2008-10-15 13:06 -------
Subject: Re:  [4.4 Regression] calculix gets wrong answer for -O1 -ffast-math

Making PRE do this is somewhat trivial.
Just extend fully_constant_expression to fold builtins, like it used
to, and it should just DTRT.


On Wed, Oct 15, 2008 at 5:38 AM, jakub at gcc dot gnu dot org
<gcc-bugzilla@gcc.gnu.org> wrote:
>
>
> ------- Comment #16 from jakub at gcc dot gnu dot org  2008-10-15 09:38 -------
> After discussion with richi, I'd like to turn this into an enhancement request
> for 4.5 to extend PRE/SCCVN to be able to optimize that:
>  # cn_43 = PHI <-1.0e+0(4), 1.0e+0(3)>
>  D.1267_44 = __builtin_pow (cn_43, 2.0e+0);
> into a constant.
>
>
> --
>
> jakub at gcc dot gnu dot org changed:
>
>           What    |Removed                     |Added
> ----------------------------------------------------------------------------
>                 CC|                            |dberlin at gcc dot gnu dot
>                   |                            |org, rguenth at gcc dot gnu
>                   |                            |dot org
>   Target Milestone|4.4.0                       |4.5.0
>
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37449
>
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-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37449