It's in the Compiler Writer's Guide with explanation; section 5-10.
http://www-01.ibm.com/chips/techlib/techlib.nsf/techdocs/852569B20050FF7785256996007558C6
There are lots of clever examples in there, it's definitely recommended
reading (I should make a cheat sheet of chapter 5 though so I can pin it
to my wall)
--
Matt Sealey <[EMAIL PROTECTED]>
Genesi, Manager, Developer Relations
Scott Wood wrote:
Kevin Diggs wrote:
Hi,
x86 has bsf and bsr. PPC has cntlzw which I think is equivalent to
bsr. Anyone know of a sneaky algorithm to do bsf?
wordsize - 1 - cntlzw(x & ~(x - 1));
-Scott
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