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Re: simplify_subreg issues
- To: Geoff Keating <geoffk at redhat dot com>
- Subject: Re: simplify_subreg issues
- From: Mark Mitchell <mark at codesourcery dot com>
- Date: Wed, 20 Jun 2001 15:03:47 -0700
- cc: "kenner at vlsi1 dot ultra dot nyu dot edu" <kenner at vlsi1 dot ultra dot nyu dot edu>, "jh at suse dot cz" <jh at suse dot cz>, "gcc at gcc dot gnu dot org" <gcc at gcc dot gnu dot org>
> Think here of a hardware register, which is sensitive to 8-byte or
> 4-byte accesses.
Yeah -- but not a lot of hardware has registers that naturally store
complex numbers.
I wonder if we shouldn't just say that GCC makes no guarantees about the
number of
times something is accessed unless it is volatile and of one of the builtin
C integer
types. In pratice, that's what people usually care about. It might be
better to
make a limited promise that we could implement with confidence.
--
Mark Mitchelll mark@codesourcery.com
CodeSourcery, LLC http://www.codesourcery.com