On Thu, Feb 02, 2017 at 02:47:12AM -0600, Segher Boessenkool wrote:
> On Thu, Feb 02, 2017 at 08:51:19AM +0100, Jakub Jelinek wrote:
> > Thanks, though at this point I think the
> > http://gcc.gnu.org/ml/gcc-patches/2017-01/msg02390.html
> > patch is better. With the earliest patch (the one below) for -mvsx
> > -mno-popcntd (or whatever -mcpu= implies that) there is no DF->DI conversion
> > at all, while with the latest one (msg02390.html) we can still emit the
> > xscvdpuxds instruction (as the only alternative, kind like as if the
> > *fixuns_trunc<mode>di2_fctiduz instruction disabled the fctiduz alternative
> > if power7 isn't availkable, at least for DF->DI).
>
> Both VSX and the fctiduz instruction were introduced with Power7. The
> -mpopcntd flag means "Use ISA 2.06 instructions" (that is, Power7 and
> later); the flag should really not exist at all but we are kind of stuck
> with it now.
>
> I think the patch will work, but I'd rather not make things more complex
> for no good, certainly not during stage 4.
Ok, I'll commit the first patch then. Thanks.
Jakub
