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Re: RX: 4.5 branch: Fix alignment and addressing issues.

From: Nick Clifton <nickc at redhat dot com>
To: Richard Henderson <rth at redhat dot com>
Cc: gcc-patches at gcc dot gnu dot org
Date: Wed, 16 Mar 2011 17:59:04 +0000
Subject: Re: RX: 4.5 branch: Fix alignment and addressing issues.
References: <m3k4fzs2v1.fsf@redhat.com> <4D80EF6D.2040302@redhat.com>

Hi Richard,

Do you really need peepholes for this?  I would have thought that
merely adding the instruction patterns for this would have been
enough to encourage combine to do its job merging these patterns...

I thought so too, but I found in my tests that combine was missing plenty of cases where the optimization could take place. Hence I added the peepholes. (I admit that I did not delve deeply into *why* combine was not using my instruction pattens, I just found that the peepholes worked). Plus I reasoned that the peepholes could not hurt...

Cheers
  Nick

References:
- RX: 4.5 branch: Fix alignment and addressing issues.
  - From: Nick Clifton
- Re: RX: 4.5 branch: Fix alignment and addressing issues.
  - From: Richard Henderson

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