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Re: [PATCH][GCC][mid-end] Allow larger copies when target supports unaligned access [Patch (1/2)]

From: Peter Bergner <bergner at vnet dot ibm dot com>
To: Tamar Christina <Tamar dot Christina at arm dot com>
Cc: Alan Modra <amodra at gmail dot com>, Richard Biener <rguenther at suse dot de>, "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>, nd <nd at arm dot com>, "law at redhat dot com" <law at redhat dot com>, "ian at airs dot com" <ian at airs dot com>
Date: Wed, 4 Apr 2018 07:43:13 -0500
Subject: Re: [PATCH][GCC][mid-end] Allow larger copies when target supports unaligned access [Patch (1/2)]
References: <20171115155237.GA30502@arm.com> <alpine.LSU.2.20.1711160858100.12252@zhemvz.fhfr.qr> <20171116114254.GA11570@arm.com> <alpine.LSU.2.20.1711161254130.12252@zhemvz.fhfr.qr> <20171116152701.GA15229@arm.com> <20180329143525.GA3812@bubble.grove.modra.org> <64772721-85a9-96f7-62ef-53c7f31329ed@vnet.ibm.com> <alpine.LSU.2.20.1804031255190.18265@zhemvz.fhfr.qr> <20180403122505.GJ3812@bubble.grove.modra.org> <alpine.LSU.2.20.1804031429420.18265@zhemvz.fhfr.qr> <20180403131610.GK3812@bubble.grove.modra.org> <DB6PR0802MB25044486ABAA6A2E57E58FC5FFA40@DB6PR0802MB2504.eurprd08.prod.outlook.com>

On 4/4/18 4:06 AM, Tamar Christina wrote:
> Now that I know how the loads are done, I have a patch should be both correct and generate better code in most cases.
> It just calculates bitsize inside the loop and does the copying in the largest mode possible that's equal or less than the bits
> That are to be copied. This avoids the issue with reading too much, honors padding and alignment and still generates better code
> In most cases.
> 
> I'm running the regression tests and should have a final version soon.

If you give me your patch when it's ready, I'll do bootstrap and regression
testing on powerpc*-linux and verify it fixes the issues we hit.

Peter

Follow-Ups:
- Re: [PATCH][GCC][mid-end] Allow larger copies when target supports unaligned access [Patch (1/2)]
  - From: Jeff Law

References:
- Re: [PATCH][GCC][mid-end] Allow larger copies when target supports unaligned access [Patch (1/2)]
  - From: Richard Biener
- Re: [PATCH][GCC][mid-end] Allow larger copies when target supports unaligned access [Patch (1/2)]
  - From: Alan Modra
- Re: [PATCH][GCC][mid-end] Allow larger copies when target supports unaligned access [Patch (1/2)]
  - From: Richard Biener
- Re: [PATCH][GCC][mid-end] Allow larger copies when target supports unaligned access [Patch (1/2)]
  - From: Alan Modra
- RE: [PATCH][GCC][mid-end] Allow larger copies when target supports unaligned access [Patch (1/2)]
  - From: Tamar Christina

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