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From: karsh@trifolium.esd.sgi.com (Bruce Karsh)
Newsgroups: comp.arch
Subject: Re: 64 bits for times....
Keywords: timing, high resolution timing
Message-ID: <67681@sgi.sgi.com>
Date: 24 Aug 90 21:08:18 GMT
References: <5539@darkstar.ucsc.edu> <13285@yunexus.YorkU.CA> <30728@super.ORG> <26012@bellcore.bellcore.com> <11187@alice.UUCP> <1990Aug23.022416.14798@sco.COM> <703@exodus.Eng.Sun.COM> <67633@sgi.sgi.com> <368@news.nd.edu>
Sender: karsh@trifolium.esd.sgi.com
Reply-To: karsh@trifolium.sgi.com (Bruce Karsh)
Organization: Silicon Graphics, Inc., Mountain View, CA
Lines: 15

>How about:
>
>       ld.l    r1, CLOCK
>       <instr>
>       ld.l    r2, CLOCK
>       ld.l    r3, CLOCK
>       sub.l   r4, r2, r1	; r4 = Tinstr + Tclockfetch
>       sub.l   r5, r3, r2	; r5 = Tclockfetch
>       sub.l   r6, r4, r5	; r6 = Tinstr
>No side effects are involved here. Of course CLOCK cannot be cached or else :^)

Very nice!

			Bruce Karsh
			karsh@sgi.com