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[Patch AArch64] Add early clobber for the store_exclusive patterns.

From: Ramana Radhakrishnan <ramana dot radhakrishnan at arm dot com>
To: GCC Patches <gcc-patches at gcc dot gnu dot org>
Cc: nd <nd at arm dot com>, Richard Earnshaw <Richard dot Earnshaw at arm dot com>, James Greenhalgh <James dot Greenhalgh at arm dot com>
Date: Thu, 12 Jul 2018 15:22:03 +0100
Subject: [Patch AArch64] Add early clobber for the store_exclusive patterns.

Hi,


I've had this in my patch stack after discovering the gas issue where we
weren't warning on cases that were unpredictable according to the
architecture.

I would like to backport this fix to earlier GCC branches too. I did a
few attempts but I haven't been able to trigger the unpredictable behaviour.

Bootstrapped and regression tested on AArch64 , no regressions.

Ok ?

Thanks,
Ramana


* config/aarch64/atomics.md (aarch64_store_exclusive<mode>): Add early
clobber.

Attachment: earlyclobber.txt
Description: Text document

Follow-Ups:
- Re: [Patch AArch64] Add early clobber for the store_exclusive patterns.
  - From: Richard Earnshaw (lists)

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