[Mesa-dev] [PATCH] gallium/util: add util_bitcount64

[Tom Stellard]

On Tue, Sep 30, 2014 at 12:29:52PM -0400, Ilia Mirkin wrote:
> Perhaps do the same thing as util_bitcount, i.e.
> 
> #if defined(PIPE_CC_GCC) && (PIPE_CC_GCC_VERSION >= 304)
>   return __builtin_popcountll(n);
> #else
> ...
> #endif
> 
> Perhaps the gcc version check is no longer necessary, unlikely
> anyone's using gcc3.3 or earlier at this point. But whatever.
>

I saw a patch from Matt recently that added autoconf checks for a bunch
of different builtin functions, I think we should use those instead.

-Tom

> On Tue, Sep 30, 2014 at 12:26 PM, Marek Olšák <maraeo at gmail.com> wrote:
> > From: Marek Olšák <marek.olsak at amd.com>
> >
> > I'll need this in radeonsi.
> > ---
> >  src/gallium/auxiliary/util/u_math.h | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> >
> > diff --git a/src/gallium/auxiliary/util/u_math.h b/src/gallium/auxiliary/util/u_math.h
> > index 39bd40f..48d5c31 100644
> > --- a/src/gallium/auxiliary/util/u_math.h
> > +++ b/src/gallium/auxiliary/util/u_math.h
> > @@ -727,6 +727,14 @@ util_bitcount(unsigned n)
> >  #endif
> >  }
> >
> > +
> > +static INLINE unsigned
> > +util_bitcount64(uint64_t n)
> > +{
> > +       return util_bitcount(n) + util_bitcount(n >> 32);
> > +}
> > +
> > +
> >  /**
> >   * Reverse bits in n
> >   * Algorithm taken from:
> > --
> > 1.9.1
> >
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