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Re: [PATCH][RFA][LRA] Don't try to break down subreg expressions if insn already matches

From: Jeff Law <law at redhat dot com>
To: Maxim Kuvyrkov <maxim dot kuvyrkov at linaro dot org>, Kyrill Tkachov <kyrylo dot tkachov at arm dot com>
Cc: Andrew Pinski <pinskia at gmail dot com>, GCC Patches <gcc-patches at gcc dot gnu dot org>, Vladimir Makarov <vmakarov at redhat dot com>
Date: Mon, 16 Feb 2015 23:18:33 -0700
Subject: Re: [PATCH][RFA][LRA] Don't try to break down subreg expressions if insn already matches
Authentication-results: sourceware.org; auth=none
References: <54DDC859 dot 3010805 at arm dot com> <41018A63-9F81-4798-9E72-ADAA723D75FD at gmail dot com> <54DDD624 dot 50406 at arm dot com> <8F75E52A-2ED8-4404-90FA-E5FF921E4F87 at linaro dot org>

On 02/14/15 04:23, Maxim Kuvyrkov wrote:


FYI, (and not related to the core issue of this patch)

The use of mult vs shift by combine is a problem that Venkat is
working on, see "[RFC] Tighten memory type assumption in RTL combiner
pass" .  The combiner uses MULTs instead of SHIFTs for rtx'es that
look like addresses, even when they are, in fact, mere
logic/arithmetic operations.

Right. I think I put that into my gcc-6 queue because we don't have aregression that requires this problem be fixed.

If you've got a BZ that's regressing because of this issue, don'thesitate to point it out and I'll move the thread into my gcc-5 queue.


jeff

Follow-Ups:
- Re: [PATCH][RFA][LRA] Don't try to break down subreg expressions if insn already matches
  - From: Kyrill Tkachov

References:
- [PATCH][RFA][LRA] Don't try to break down subreg expressions if insn already matches
  - From: Kyrill Tkachov
- Re: [PATCH][RFA][LRA] Don't try to break down subreg expressions if insn already matches
  - From: pinskia
- Re: [PATCH][RFA][LRA] Don't try to break down subreg expressions if insn already matches
  - From: Kyrill Tkachov
- Re: [PATCH][RFA][LRA] Don't try to break down subreg expressions if insn already matches
  - From: Maxim Kuvyrkov

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