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Re: Bit twiddling builtins
- From: Falk Hueffner <falk dot hueffner at student dot uni-tuebingen dot de>
- To: "Joseph S. Myers" <jsm28 at cam dot ac dot uk>
- Cc: Richard Henderson <rth at redhat dot com>, H?kan Hjort <d95hjort at dtek dot chalmers dot se>, <gcc-patches at gcc dot gnu dot org>
- Date: 24 Jan 2003 03:29:10 +0100
- Subject: Re: Bit twiddling builtins
- References: <Pine.LNX.4.33.0301232315060.25199-100000@kern.srcf.societies.cam.ac.uk>
"Joseph S. Myers" <jsm28@cam.ac.uk> writes:
> On 23 Jan 2003, Falk Hueffner wrote:
> > here's a draft of a patch that implements bit scanning and
> > counting builtins. No docs or test cases yet, but I'd be
> > interested in any comments. Constant folding also isn't
> > implemented yet.
>
> This is really the sort of patch that needs docs _first_ (to explain
> the exact semantics of each proposed function) before code.
Well, it was mentioned in another thread ("rs6000 and ffs"). But I'll
just post an updated patch with docs.
> Anyway, you shouldn't be adding anything to the GCC 3.3 versioned
> symbols in libgcc now, you need to add a new version for 3.4.
OK.
--
Falk