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Re: scm_gc_mark

From: Michael Livshin
Subject: Re: scm_gc_mark
Date: 31 Jan 2001 18:16:32 +0200
User-agent: Gnus/5.0807 (Gnus v5.8.7) XEmacs/21.1 (Crater Lake)

Keisuke Nishida <address@hidden> writes:

> scm_gc_mark() returns immediately if the object is SCM_IMP.
> Isn't it better to define it like this?
> #define scm_gc_mark(x) \
>   do { if (SCM_NIMP (x)) scm_i_gc_mark (x); } while (0)

could be faster, yes.  as with all things involving frequently and
recursively called functions, a real improvement is not certain (it
may sound paranoid, but I speak from (some) experience).

if you benchmark and see an improvement, feel free to make this
change.  be sure to benchmark with deeply nested data structures;
cons-trees with deep nesting _both_ in the car and the cdr are best
(and easiest to generate) for making scm_gc_mark() eat huge quantities
of stack space.

or don't, and I'll get around to it.  eventually.


He who joyfully marches to music rank and file, has already earned my
contempt. He has been given a large brain by mistake, since for him
the spinal cord would surely suffice.              -- Albert Einstein

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