From: Xavier Leroy <Xavier.Leroy@inria.fr>
To: Norman Ramsey <nr@eecs.harvard.edu>
Cc: caml-list@inria.fr
Subject: Re: unsigned comparisons on int32, int64, nativeint?
Date: Sun, 21 Jan 2001 11:37:07 +0100 [thread overview]
Message-ID: <20010121113707.B13901@pauillac.inria.fr> (raw)
In-Reply-To: <200101181740.MAA28644@labrador.eecs.harvard.edu>; from nr@eecs.harvard.edu on Thu, Jan 18, 2001 at 12:40:36PM -0500
> I have sought but not found unsigned comparisons on the integer types
> int32, int64, and nativeint. I especially need `unsigned less than'.
> Where might I find bindings for these operations?
In a pinch, you can always use signed compares after shifting the
arguments by min_int, e.g.:
let ule_int32 a b = Int32.add a Int32.min_int <= Int32.add b Int32.min_int
(I have a very strong feeling that it should work, but no doubt
expert bit-twiddlers on this list will correct me if it doesn't.)
The code generated for this is nowhere as efficient as a
processor-native unsigned comparison, though.
- Xavier Leroy
prev parent reply other threads:[~2001-01-21 21:21 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-01-18 17:40 Norman Ramsey
2001-01-21 10:37 ` Xavier Leroy [this message]
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