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Re: (INCF Variable <float>) creates garbage!?
- To: Repenning Alexander <email@example.com>
- Subject: Re: (INCF Variable <float>) creates garbage!?
- From: kab (Kim Barrett)
- Date: Thu, 11 Feb 93 18:11:22
- Cc: firstname.lastname@example.org
> I' have big loops incrementing floats. These loops create quite some
> garbage since incrementing a variable with a float apparently creates
> garbage (in MCL2.0p2):
> (defvar V 0)
> (time (incf V 1.5))
> ...8 bytes of memory allocated.
> Is there no way arround this? Intuitively I'd think INCF should be
> able to increment floats without producing any garbage (e.g., better
I'd say 8 bytes is pretty good, since that's the size of the double float object
it has to cons up as the new value. incf is *not* a destructive operation, and
does not bash the old value (who knows who else might be pointing at that 0.0,
expecting it to remain zerop).