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Re: [Axiom-developer] Left shifts of negative numbers
From: |
Dylan Thurston |
Subject: |
Re: [Axiom-developer] Left shifts of negative numbers |
Date: |
Tue, 14 Oct 2003 22:48:28 -0400 |
User-agent: |
Mutt/1.5.4i |
On Tue, Oct 14, 2003 at 07:06:07PM -0400, Page, Bill wrote:
> [ Some of your emails arrive as text file attachments to
> otherwise empty emails (such as this one) and other times
> as ordinary email? Are you sending an unusual format to
> the axioim mailing list? (e.g. HTML or "rich text" format). ]
It's because I habitually sign my e-mails, and that's how the mailing
list software deals with it. I'll stop if it's too annoying.
> ... Oddly, I could not find any definition for
> QSLEFTSHIFT.
It's defined as a macro equivalent to ash for fixnum's in
src/interp/vmlisp.lisp.pamphlet.
> Failing finding a native Lisp function that does the
> job, how about defining it as
>
> shift(x,y) == integer(ASH(x-1,y)$Lisp)+1
In the case when x and y are both negative, I think this gives the
"round towards zero" semantics that seem to be expected. An
alternative is
shift(x,y) == -integer(ASH(-x,y)$LISP)
which might be clearer.
Peace,
Dylan
- [Axiom-developer] Left shifts of negative numbers, Dylan Thurston, 2003/10/14
- RE: [Axiom-developer] Left shifts of negative numbers, Page, Bill, 2003/10/14
- Re: [Axiom-developer] Left shifts of negative numbers,
Dylan Thurston <=
- RE: [Axiom-developer] Left shifts of negative numbers, Page, Bill, 2003/10/14
- RE: [Axiom-developer] Left shifts of negative numbers, Page, Bill, 2003/10/14