[Sbcl-devel] Re: ASH modular function optimization

[Michael H. <mw...@py...>]

Nathan Froyd <fr...@cs...> writes:

> I guess I was treating the (LDB (BYTE 32 0) ...) idiom as a "Do what C
> would do" escape hatch and was surprised when it didn't give me the
> answer I expected.  Part of my surprise may have been a failure to note
> that C's >> is a logical shift (right?) and ASH performs an arithmetic
> shift instead.

I believe what C does is actually undefined, but almost every C
compiler out there does an arithmetic right shift (except some ...
Cray? ... something that you're not surprised is different, anyway).

Cheers,
mwh

-- 
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