[Bug middle-end/64225] -funsafe-math-optimizations generates call to pow where multiply instruction would do

[ktkachov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64225

ktkachov at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-12-08
     Ever confirmed|0                           |1

--- Comment #3 from ktkachov at gcc dot gnu.org ---
(In reply to ktkachov from comment #2)
> (In reply to Bernard Ogden from comment #1)
> > Created attachment 34218 [details]
> > -v output
> 
> Hmm, I get the good sequence:
>         ldr     d1, .LC0
>         fmul    d1, d0, d1
>         fmul    d0, d1, d0
> 
> with current FSF 4.8.4, 4.9.3 and latest 5.0 with just -O1 without having to
> specify -funsafe-math-optimisations or -ffast-math

Ah wait, sorry, I misread the report. The problem is that
-funsafe-math-optimisations introduces that call to pow instead of doing the
mults.

Confirmed.