Groups > comp.lang.c > #19938

size test

From	jgk@panix.com (Joe keane)
Newsgroups	comp.lang.c, comp.arch
Subject	size test
Date	2012-04-25 23:34 +0000
Organization	Public Access Networks Corp.
Message-ID	<jna1ll$f2a$1@reader1.panix.com> (permalink)

Cross-posted to 2 groups.

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I have macros:

#define MAKE_SIZE_CLASS (X, Y, CLS)
((CLS) = ((X) & 0xF << 2) | (Y) & 0x3)
#define BLOWUP_SIZE_CLASS (CLS, X, Y)
((X) = (CLS) >> 4 & 0xF, (Y) = (CLS) & 0x3)

with this:

#define CLASS_SIZE(X, Y) \
((0x4 | (Y) & 0x3) << (X))

How do i get an inverse of CLASS_SIZE.

That is. we do not necessraily get a posssible result of CLASS_SIZE, but
we always round *up*, not down.

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Thread

size test jgk@panix.com (Joe keane) - 2012-04-25 23:34 +0000
  Re: size test Eric Sosman <esosman@ieee-dot-org.invalid> - 2012-04-25 21:03 -0400
  Re: size test Kaz Kylheku <kaz@kylheku.com> - 2012-04-26 02:54 +0000

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