property list hack, profiling, compiler optimization, looking at code
Subject: property list hack, profiling, compiler optimization, looking at code
From: Stavros Macrakis
Date: Sun, 12 Aug 2012 13:25:23 -0400
Well, one easy improvement to (big-)flonum-eval is to call trisplit
directly instead of calling it twice via realpart/imagpart.
trisplit returns the cons of the realpart and the imagpart in a single
calculation. trisplit = top-level real/imaginary split.
I suppose trisplit should be rewritten to use multiple-value-return (which
didn't exist when it was written) to avoid 1 cons.
-s
On Sun, Aug 12, 2012 at 7:49 AM, Barton Willis <willisb at unk.edu> wrote:
> ________________________________________
>
> >Looks like there are a bunch of places to make this program run faster.
> >zerop1 is near the top. risplit (real-imaginary-split ???) is there too.
>
> The trig simplification code calls both flonum-eval and big-float-eval.
> Both of these functions call
> $imagpart and $realpart. And both $imagpart and $realpart call risplit :(
>
> Fortunately for pure symbolic cases, such as cos(x), flonum-eval and
> big-float-eval bail out with out calling
> risplit.
>
>
> --bw
>
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