Re: is C necessarily faster than C++

t.hulek@imperial.ac.uk (Mr Tomas Hulek)
Tue, 18 Apr 1995 05:05:47 GMT

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[17 later articles]
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Newsgroups: comp.compilers
From: t.hulek@imperial.ac.uk (Mr Tomas Hulek)
Keywords: C, C++, performance
Organization: Imperial College of Science, Technology and Medicine, London
References: 95-04-044
Date: Tue, 18 Apr 1995 05:05:47 GMT

tbrannon (tbrannon@mars.mars.eecs.lehigh.edu) wrote:
| This guy in my lab keeps refusing to use C++ in our program intended
| to simulate somatosensory neural circuits because he says it is slower
| than C. My (uninformed) response was that most of what you see as
| overhead (ie, message routing, value accessing, type checking) is
| optimized away at compile-time.




I have the following experience:


If I have a program that is both valid C and C++, a C++ compiler generates
faster code then C (tested on IBM xlC, CC on DEC/Alpha). My explanation is
that because of stricter type checking, the compiler can use more aggressive
assumptions concerning aliasing.


--
Tomas Hulek --------------------------------------------------t.hulek@ic.ac.uk
Mechanical Engineering Dept.
Imperial College
London SW7 2BX tel. (+44 171) 589 5111 x 57112
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