NetNews Offline 2/NetNews Offline Volume 2.iso/news/comp/lang/c++-part2/15724

Internet Message Format | 1996-08-05 | 993 b

Path: nyx.cs.du.edu!not-for-mail
From: [e-mail] (A. N. Alias)
Newsgroups: comp.lang.c++
Subject: C++ complex numbers slow as molasses?
Date: 6 Apr 1996 13:30:04 -0700
Organization: University of Denver, Dept. of Math & Comp. Sci.
Message-ID: <4k6k8c$[e-mail]>
NNTP-Posting-Host: nyx.nyx.net
Keywords: Complex.h complex numbers speed

I'm using the complex number implementation that came with
GNU C++ (v2.4).  It seems that basic complex arithmetic
(+, -, *, /, exp) runs about 2.5 times slower than when I
code the same thing in C!  I realize that C++ could be a
bit slower, but I thought that the speed difference would
be far less drastic (esp. if the C++ compiler inlines the
arithmetic operators, as the Complex.h declarations specify).
In fact, I've read claims that C++ often runs just as fast
as C for this kind of application.

Is this normal?  What, if anything, can I do to speed things
up?  It would be quite tedious to rewrite the code in C.

Thanks,

-Al