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From: | Gerd Möllmann |
Subject: | Re: [PATCH] Re: Bignum performance |
Date: | Wed, 16 Aug 2023 10:05:36 +0200 |
User-agent: | Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:102.0) Gecko/20100101 Thunderbird/102.14.0 |
On 16.08.23 08:42, Po Lu wrote:
Gerd Möllmann <gerd.moellmann@gmail.com> writes:I don't know about SBCL, but as for Emacs, refer to the definition of VALBITS in lisp.h (maybe also the right files among m/*.h and s/*.h, but I have no idea where they've disappeared to.)The SBCL I have here, a Homebrew installation, uses the scheme where ....0 -> fixnum ....1 -> other objects (discriminated by additional tag bits) I had the same for Emacs in the branch gerd_int in the 2000s, if memory serves me.In today's Emacs, 0 is Lisp_Symbol; this facilitates representing Qnil as C NULL.
Yes, and I don't see a need to change anything in this regard in Emacs. IMHO, the fixnum range is more than sufficient nowadays, in general.
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