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Re: [PATCH] simplify-rtx: Handle truncate of extract

From: Segher Boessenkool <segher at kernel dot crashing dot org>
To: Jeff Law <law at redhat dot com>
Cc: gcc-patches at gcc dot gnu dot org
Date: Mon, 28 Nov 2016 15:55:59 -0600
Subject: Re: [PATCH] simplify-rtx: Handle truncate of extract
Authentication-results: sourceware.org; auth=none
References: <f9750839f350fc5e412311d080c6e8fbae5406b9.1480201869.git.segher@kernel.crashing.org> <2f14bc3e-1fd0-459c-a1a8-8c5efec881db@redhat.com>

On Mon, Nov 28, 2016 at 01:56:10PM -0700, Jeff Law wrote:
> On 11/26/2016 04:19 PM, Segher Boessenkool wrote:
> >simplify_truncation changes the truncation of many operations into
> >the operation on the truncation.  This patch makes this code also
> >handle extracts.
> >
> >Tested on powerpc64-linux.  With this patch the rlwimi testcases work.
> >
> >Is this okay for trunk?
> The rlwimi tests?  Are you referring to ppu-intrinsics or something else?

https://gcc.gnu.org/ml/gcc-patches/2016-11/msg02672.html

> Any chance this would help 15596?

It doesn't help.  To fix PR15596 we need to have bitfields handled
better before (and/or during) expand.

Thanks,


Segher

Follow-Ups:
- Re: [PATCH] simplify-rtx: Handle truncate of extract
  - From: Jeff Law

References:
- [PATCH] simplify-rtx: Handle truncate of extract
  - From: Segher Boessenkool
- Re: [PATCH] simplify-rtx: Handle truncate of extract
  - From: Jeff Law

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