Path: utzoo!mnetor!uunet!mcvax!unido!ecrcvax!johng
From: johng@ecrcvax.UUCP (John Gregor)
Newsgroups: comp.arch
Subject: Re: RISC data alignment
Message-ID: <496@ecrcvax.UUCP>
Date: 10 Feb 88 13:00:04 GMT
References: <2635@calmasd.GE.COM> <28200092@ccvaxa>
Reply-To: johng@ecrcvax.UUCP (John Gregor)
Organization: ECRC, Munich 81, West Germany
Lines: 25

In article <28200092@ccvaxa> aglew@ccvaxa.UUCP writes:
>
>I have often wanted an optimizing compiler that could take
>struct { long a; int b; long c; char d; }
>which is usually mapped into bytes as AAAABBxxCCCCDxxx
>(on a machine where misaligned accesses are penalized)
>and make it into AAAACCCCBBDx.
>
>Andy "Krazy" Glew. Gould CSD-Urbana.    1101 E. University, Urbana, IL 61801   

I would like that also, but don't call it a struct.  Rearranging the order
breaks lots of code and violates K&R p. 196.

	Within a structure, the objects declared have addresses
	which increase as their declarations are read left-to-right.

Call it a collection, or packed struct or something else.  If I had a PCish
type machine, I'd really like a feature like that.  I'm spoiled rotten by
virtual memory :-).

-- 
pqpqpqpqpqpqpqpqpqpqpqpqpqpqpqpqpqpqpqpqpqpqpqpqpqpqpqpqpqpqpqpqpqpqpqpqpqpqpqpq
bdbdbdbdbdbdbdbdbdbdbdbdbdbdbdbdbdbdbdbdbdbdbdbdbdbdbdbdbdbdbdbdbdbdbdbdbdbdbdbd

John Gregor                                     johng%ecrcvax.UUCP@germany.CSNET