Local optimization options

[Thomas König]

> Am 04.07.2020 um 19:11 schrieb Richard Biener <richard.guenther@gmail.com>:
> 
> On July 4, 2020 11:30:05 AM GMT+02:00, "Thomas König" <tk@tkoenig.net> wrote:
>> 
>> What could be a preferred way to achieve that? Could optimization
>> options like -ffast-math be applied to blocks instead of functions?
>> Could we set flags on the TREE codes to allow certain optinizations?
>> Other things?
> 
> The middle end can handle those things on function granularity only. 
> 
> Richard. 

OK, so that will not work (or not without a disproportionate
amount of effort).  Would it be possible to set something like a
TREE_FAST_MATH flag on TREEs? An operation could then be
optimized according to these rules iff both operands
had that flag, and would also have it then.

Regards, Thomas