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Re: new auto-inc-dec pass
- From: Joern Rennecke <amylaar at spamcop dot net>
- To: Roman Zippel <zippel at linux-m68k dot org>
- Cc: gcc at gcc dot gnu dot org
- Date: Tue, 06 Mar 2007 06:10:10 -0500
- Subject: Re: new auto-inc-dec pass
In http://gcc.gnu.org/ml/gcc/2007-03/msg00128.html, you wrote:
> One case is about multiple increments, the tree optimizer merges them and
> increments the register only once, so if one only looks at the size of the
> pointer value one misses them, e.g. something like this:
>
> (set (mem (reg)) (x))
> (set (mem (plus (reg) (const_int 4))) (x))
> (set (reg) (plus (reg) (const_int 8))
The patches attached to PR20211 handle this case.