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Date: Thu, 25 Sep 2014 19:30:00 -0000
From: Segher Boessenkool <segher@kernel.crashing.org>
To: Michael Collison <michael.collison@linaro.org>
Cc: Andrew Pinski <pinskia@gmail.com>, GCC Patches <gcc-patches@gcc.gnu.org>
Subject: Re: [AArch64] Fix predicate and constraint mismatch in logical atomic operations
Message-ID: <20140925193048.GC3802@gate.crashing.org>
References: <54238FEF.6030006@linaro.org> <CA+=Sn1mRZV6pn9urzkwJ_FP=7yVvfBLUEVwsievQE6DZAs+F7Q@mail.gmail.com> <54239551.6090400@linaro.org> <CA+=Sn1=knOQxDzJQRM8PshFbdo+-x22k1LWx5Nb6FiS+=j_p5Q@mail.gmail.com> <54239657.4090208@linaro.org> <CA+=Sn1ko=eHfibkRe1xoWYTNp5E3_DjWgL3hMK5Dsx94ayJhjQ@mail.gmail.com> <20140925101234.GA14286@gate.crashing.org> <542451DD.1070808@linaro.org>
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On Thu, Sep 25, 2014 at 10:33:17AM -0700, Michael Collison wrote:
> The problem is the "CONST_INT 0", not a large constant. This constant is 
> not accepted by the predicate, but is accepted by the constraint.

Yes, bad choice of words, sorry.  Just read "big" as "not matching the
predicate".  The point is that everything works fine until RA, and that
makes it hard to make a useful test.


Segher


p.s.  Please don't top-post.  Thanks.