Path: utzoo!yunexus!geac!daveb
From: daveb@geac.UUCP (David Collier-Brown)
Newsgroups: comp.sys.mac
Subject: Re: Code Optimization
Keywords: Single Pass Compilers Code Optimization
Message-ID: <2237@geac.UUCP>
Date: 10 Feb 88 13:51:59 GMT
Article-I.D.: geac.2237
Posted: Wed Feb 10 08:51:59 1988
References: <6252@cc5.bbn.COM> <312@oophost.UUCP>
Reply-To: daveb@geac.UUCP (David Collier-Brown)
Organization: /usr/lib/news/organisation
Lines: 21

In article <312@oophost.UUCP> bobc@oophost.UUCP (Bob Campbell) writes:
|... analysis of what a "one-pass" compiler is is a little weak.  The
|one pass compilers that I am aware of do not generate assembler
|output.  Why? because using the assembler removes all of the speed
|advantages that were gained by using "one-pass" compiler.  
|
|>An optimizer cannot run on compiled binary - the problem is indeterminate. The
|>reason is simple: The optimizer cannot differentiate between data and code.

  Er... It can run on the output of the code generator if that
output is in something close to relocatable format, or if it is in
linkable format (Unix .o, for example).  It just requires more work.
  If most suppliers write linkable code to a standard format,
writing a post-optimizer becomes more worthwhile...

 --dave
-- 
 David Collier-Brown.                 {mnetor yunexus utgpu}!geac!daveb
 Geac Computers International Inc.,   |  Computer Science loses its
 350 Steelcase Road,Markham, Ontario, |  memory (if not its mind) 
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