X-Url:	http://www.deakin.edu.au/~dpyke
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Date:	Tue, 11 May 1999 16:08:36 +1100
To:	pgcc AT delorie DOT com
From:	David Pyke <dspyke AT deakin DOT edu DOT au>
Subject:	Re: Optimization question
Cc:	David Whysong <dwhysong AT physics DOT ucsb DOT edu>
In-Reply-To:	<Pine.LNX.4.04.9905101557370.15643-100000@sal.physics.ucsb.
	edu>
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Reply-To:	pgcc AT delorie DOT com

---
<snip>
---
>Hand optimizing the full 3300 lines of code has so far resulted in a
>factor of two speed increase, and I'm not finished yet.
>
>I suspect the problem is a lack of registers, assuming (from what you said
>before) that the compiler will only do CSE if there is a spare register. I
>would have thought the compiler would use temporary variables on the stack
>if no registers are available, but then again I don't write compilers.
>
well i don't know much about pgcc (or compilers) either but it sound like
it would be a good candidate for an optimisation overide flag.  so you can
say  'I want you to use this even though there aren't free registers so use
the stack" type thing.

thoughts??  impossible/too hard/not worth it/implemented allready/other ????

Shoe Lace.
--
------------
People greatly underestimate the seriousness of the Y2K bug.
After all, to fix the problem, a computer programmer needs to find a date...
and we all know the likelihood of that happening!
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