[RFC] - Regression exposed by recent change to compress_float_constant

[Andrew Pinski]

> 
> Following patch has exposed an optimization shortcoming:
> 
> 2005-07-12  Dale Johannesen  <dalej@apple.com>
> 
>          * expr.c (compress_float_constant):  Add cost check.
>          * config/rs6000.c (rs6000_rtx_cost):  Adjust FLOAT_EXTEND cost.

I think this is the same problem as PR 23098 which shows we fail to optimizate it
from before that change.

-- Pinski