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Re: [RFC - ARM] - Fix PR43440 - Fix Neon inline asm register aliasing issues.
- From: Richard Earnshaw <rearnsha at arm dot com>
- To: Richard Henderson <rth at redhat dot com>
- Cc: ramana dot radhakrishnan at arm dot com, gcc-patches at gcc dot gnu dot org, rguenther at suse dot de
- Date: Wed, 27 Oct 2010 19:02:19 +0100
- Subject: Re: [RFC - ARM] - Fix PR43440 - Fix Neon inline asm register aliasing issues.
- References: <alpine.DEB.2.00.1003200039160.9269@liliput> <1269268484.20488.18.camel@e200601-lin.cambridge.arm.com> <1288193560.2025.8.camel@rwe-pc> <4CC86631.3060906@redhat.com>
On Wed, 2010-10-27 at 13:49 -0400, Richard Henderson wrote:
> On 10/27/2010 11:32 AM, Richard Earnshaw wrote:
> > PING - this needs a GWP review, I think.
>
> Pointer to the actual patch?
http://gcc.gnu.org/ml/gcc-patches/2010-03/msg00978.html
>
> I had a look back at the original TARGET_MD_ASM_CLOBBERS
> patch and thought it looked pretty good.
>
> I can't immediately think what good the O_R_N macro can
> do outside the context of the asm clobbers. And if that
> is the case, I can't imagine that this new macro is any
> cleaner than the already clean T_M_A_C patch.
>
My patch doesn't have the side effects that Ramana originally
mentioned. It also works correctly when -ffixed-<reg> and friends are
used on the command line.
>
> r~
R.