From owner-freebsd-hackers Fri Aug 14 12:41:50 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id MAA28541 for freebsd-hackers-outgoing; Fri, 14 Aug 1998 12:41:50 -0700 (PDT) (envelope-from owner-freebsd-hackers@FreeBSD.ORG) Received: from rover.village.org (rover.village.org [204.144.255.49]) by hub.freebsd.org (8.8.8/8.8.8) with SMTP id MAA28536 for ; Fri, 14 Aug 1998 12:41:48 -0700 (PDT) (envelope-from imp@village.org) Received: from harmony [10.0.0.6] by rover.village.org with esmtp (Exim 1.71 #1) id 0z7Pil-0006TU-00; Fri, 14 Aug 1998 13:41:07 -0600 Received: from harmony.village.org (localhost.village.org [127.0.0.1]) by harmony.village.org (8.8.8/8.8.3) with ESMTP id NAA16592; Fri, 14 Aug 1998 13:43:05 -0600 (MDT) Message-Id: <199808141943.NAA16592@harmony.village.org> To: Olivier Galibert Subject: Re: 64-bit time_t Cc: hackers@FreeBSD.ORG In-reply-to: Your message of "Fri, 14 Aug 1998 20:12:33 +0200." <19980814201233.A8962@loria.fr> References: <19980814201233.A8962@loria.fr> <199808141115.FAA21672@lariat.lariat.org> <199808141526.JAA23467@lariat.lariat.org> Date: Fri, 14 Aug 1998 13:43:04 -0600 From: Warner Losh Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG In message <19980814201233.A8962@loria.fr> Olivier Galibert writes: : I has a far-from-zero cost on 32bits architectures, i.e. everything : short of R8000, R10000, alphas and very recent sparcs. The R4000 and R5000 (both of which implement MIPS III) are 64 bit as well. They have 64 bit instructions[*] and registers. While it is true that there is a cost associated with snagging bits from memory or squirting it back to memory, the cache tends to mitigate these effects somewhat. Warner [*] Meaning instructions that operate on 64 bit quantities. These are available even in 32-bit address-mode. The n32 api makes use of this to give you everything you could want from n64, without the bloat of pointers 2x in size. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message