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Re: EGCS bad on loop invariant optimization ?
- To: John Carr <jfc at mit dot edu>
- Subject: Re: EGCS bad on loop invariant optimization ?
- From: Jeffrey A Law <law at cygnus dot com>
- Date: Mon, 20 Apr 1998 21:23:13 -0600
- cc: Gabriel Dos Reis <Gabriel dot Dos-Reis at dptmaths dot ens-cachan dot fr>, egcs at cygnus dot com, wilson at cygnus dot com
- Reply-To: law at cygnus dot com
In message <199804192208.SAA19223@jfc.>you write:
>
> Try this patch.
>
> Sun Apr 19 18:07:14 1998 John Carr <jfc@mit.edu>
>
> * alias.c (true_dependence): If neither mode is QI or BLK and the
> modes are different, X and MEM do not alias.
Looks correct to me.
One day it would be nice to distinguish items which have the same
size, but are different types (ie pointers vs int/log, but we need
help from the front end, or a first-class Pmode for that).
jeff