Re: [PATCH 3/6] C-language equivalents of include/asm-*/bitops.h

Richard Henderson <[email protected]> Thu, 26 Jan 2006 17:30:14 +0000

Newsgroups	org.kernel.vger.ultralinux,org.kernel.vger.linux-ia64,org.kernel.vger.linux-kernel,org.kernel.vger.linux-mips,org.kernel.vger.sparclinux,org.ozlabs.lists.linuxppc-dev
Message-ID	<[email protected]>

On Thu, Jan 26, 2006 at 05:34:12AM +0100, Edgar Toernig wrote:
> Why shift at all?

Becuase that *is* a valid architecture tuning knob.  Most risc
machines can't AND with arbitrary constants like that, and loading
the constant might bulk things up more than just using the shift.


r~