Re: programmer optimizations?

conway@munta.cs.mu.OZ.AU (Thomas Charles CONWAY)
Thu, 5 Jan 1995 11:45:52 GMT

          From comp.compilers
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Newsgroups: comp.compilers
From: conway@munta.cs.mu.OZ.AU (Thomas Charles CONWAY)
Keywords: optimize
Organization: Computer Science, University of Melbourne, Australia
References: 94-12-145 95-01-005
Date: Thu, 5 Jan 1995 11:45:52 GMT

"Afsal C. Majeed" <afsal@genius.tisl.soft.net> writes:


>What I want to know is your view on using such "cryptic" optimizations
>and whether any of the commercial compilers attempt to do such "target
>machine" specific optimizations. The compiler we have here does not
>seem to do it.(I am using the compiler XLC which comes with AIX on
>IBM RS/6000 machines)


Will anyone (including yourself) have to read the program more than
a week after it was written? Cryptic optimisations are a GREAT way
to confuse yourself when the time comes to port or modify your program.


If your compiler is too dumb to optimise the sorts of cases you suggest
then get a compiler that can. It is reasonable to expect compilers to
be smart these days. Gone are the days when you had to use the
`register' keyword in C to get decent performance.


Thomas
--
Thomas Conway conway@cs.mu.oz.au
--

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