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From: anton@mips.complang.tuwien.ac.at (Anton Ertl)
Newsgroups: comp.lang.forth
Subject: Re: Parsing timestamps?
Date: Tue, 24 Jun 2025 16:23:19 GMT
Organization: Institut fuer Computersprachen, Technische Universitaet Wien
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Hans Bezemer <the.beez.speaks@gmail.com> writes:
>I'm also puzzled why there is always so emphasis on the "speed" issue. I 
>mean - if you want speed, do your program in C -O3 so to say. It'll blow 
>any Forth out of the water.

Take a look at the bubble benchmark in Figure 1 of
<https://www.complang.tuwien.ac.at/papers/ertl24-interpreter-speed.pdf>.
SwiftForth, VFX, and Gforth with all optimizations (the baseline) are
faster than gcc-12 -O3.  The reason for that is:

|For bubble, gcc -O3 auto-vectorizes, and the result is that there is
|partial overlap between a store and a following load, which results
|in the hardware taking a slow path rather than performing one of its
|store-to-load forwarding optimizations.

- anton
-- 
M. Anton Ertl  http://www.complang.tuwien.ac.at/anton/home.html
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