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From: jbs@mit-eddie.MIT.EDU (Jeff Siegal)
Newsgroups: net.arch,net.unix
Subject: Re: timing study of uVAX II instructions
Message-ID: <1730@mit-eddie.MIT.EDU>
Date: Fri, 25-Apr-86 15:35:04 EDT
Article-I.D.: mit-eddi.1730
Posted: Fri Apr 25 15:35:04 1986
Date-Received: Sun, 27-Apr-86 05:08:32 EDT
References: <90@wheaton>
Reply-To: jbs@mit-eddie.UUCP (Jeff Siegal)
Organization: MIT, EE/CS Computer Facilities, Cambridge, MA
Lines: 29
Xref: watmath net.arch:3168 net.unix:7709

IN ARTICLE <90@WHEATON> STUART@WHEATON.UUCP (STUART CEILOUS WILLIAMS) WRITES:
>[...]
>brb   :     1.278
>[...]
>jmp   :     1.972
>[...]
>bsbb  :     3.277
>[...]
>jsb   :     3.857
>[...]
>callg :    12.676
>calls :    13.318
>[...]
>	Also, the time for the calls instruction should give some idea of when
>it is better to use a macro than a function call.
>[...]

Of course, this has been said before, but the time for the call
instructions also gives some idea of how useful it is to have a
compiler which:

1) Expands function calls inline when appropriate.

2) Uses a faster, but less general, way to get to a function when
possible (usually only for "static" functions).

Jeff Siegal - MIT EECS