wanted: interface for signed modular arithmetic

Bug #797132 reported by Nikodemus Siivola
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
SBCL
Triaged
Medium
Unassigned

Bug Description

Subject: Re: sb-c::mask-signed-field

Nikodemus Siivola <email address hidden> writes:

> ...is required for signed modular arithmetic. Is there a reason we're
> not exporting it?

It's a bit of a rubbish interface -- it's not at all like LDB or
LOGAND. I think having SLDB (modulo naming collisions) for extracting a
bitfield and interpreting the top bit as the sign bit, and maybe SLOGAND
as well, would make me feel better about exporting those.

That's why I've never exported mask-signed-field, anyway.

C.

Tags: feature
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