Gentle ping ...
> -Original Message-
> From: Yangfei (Felix)
> Sent: Wednesday, May 27, 2020 11:52 AM
> To: 'Segher Boessenkool'
> Cc: gcc-patches@gcc.gnu.org; Zhanghaijian (A)
> Subject: RE: [PATCH PR94026] combine missed opportunity to simplify
> comparis
Hi,
> -Original Message-
> From: Segher Boessenkool [mailto:seg...@kernel.crashing.org]
> Sent: Tuesday, May 26, 2020 11:32 PM
> To: Yangfei (Felix)
> Cc: gcc-patches@gcc.gnu.org; Zhanghaijian (A)
> Subject: Re: [PATCH PR94026] combine missed opportunity to simp
Hi!
On Tue, May 26, 2020 at 03:45:05AM +, Yangfei (Felix) wrote:
> > > I am using Outlook and I didn't find the place to change the MIME type
> > > : - (
> >
> > The simplest option is to use a different email client, one that plays
> > nicely
> > with others. You use git, maybe you could
2001
> > From: Fei Yang
> > Date: Mon, 25 May 2020 10:19:30 +0800
> > Subject: [PATCH] combine: missed opportunity to simplify comparisons
> > with zero [PR94026]
>
> (Capital "M" on "Missed" please)
>
> But, the subject should say
dff90ed Mon Sep 17 00:00:00 2001
> From: Fei Yang
> Date: Mon, 25 May 2020 10:19:30 +0800
> Subject: [PATCH] combine: missed opportunity to simplify comparisons with zero
> [PR94026]
(Capital "M" on "Missed" please)
But, the subject should say what the patch *does*.
Hi,
> -Original Message-
> From: Segher Boessenkool [mailto:seg...@kernel.crashing.org]
> Sent: Saturday, May 23, 2020 10:57 PM
> To: Yangfei (Felix)
> Cc: gcc-patches@gcc.gnu.org; Zhanghaijian (A)
> Subject: Re: [PATCH PR94026] combine missed opportunity to simp
Hi!
Sorry this is taking so long.
On Wed, May 06, 2020 at 08:57:52AM +, Yangfei (Felix) wrote:
> > On Tue, Mar 24, 2020 at 06:30:12AM +, Yangfei (Felix) wrote:
> > > I modified combine emitting a simple AND operation instead of making one
> > zero_extract for this scenario.
> > >
Hi!
On Wed, May 06, 2020 at 08:57:52AM +, Yangfei (Felix) wrote:
> > This looks promising. I'll try it out, see what it does on other targets.
> > (It will
> > have to wait for GCC 11 stage 1, of course).
>
> I see GCC11 stage 1 opens for commits now.
> I have rebased the patch on the
Hi,
> -Original Message-
> From: Segher Boessenkool [mailto:seg...@kernel.crashing.org]
> Sent: Tuesday, March 24, 2020 10:58 PM
> To: Yangfei (Felix)
> Cc: gcc-patches@gcc.gnu.org; Zhanghaijian (A)
> Subject: Re: [PATCH PR94026] combine missed opportunity to simp
On Tue, Mar 24, 2020 at 06:30:12AM +, Yangfei (Felix) wrote:
> I modified combine emitting a simple AND operation instead of making one
> zero_extract for this scenario.
> Attached please find the new patch. Hope this solves both of our concerns.
This looks promising. I'll try it out,
Hi!
> -Original Message-
> From: Segher Boessenkool [mailto:seg...@kernel.crashing.org]
> Sent: Monday, March 23, 2020 8:10 PM
> To: Yangfei (Felix)
> Cc: gcc-patches@gcc.gnu.org; Zhanghaijian (A)
> Subject: Re: [PATCH PR94026] combine missed opportunity to simp
On Mon, Mar 23, 2020 at 07:46:17AM +, Yangfei (Felix) wrote:
> I think the problem here is how to make sure we are doing a ***equality***
> comparison with zero.
> We can only do the transformation under this condition.
> Then I see combine tries the following pattern:
>
> 173 Failed to
> -Original Message-
> From: Segher Boessenkool [mailto:seg...@kernel.crashing.org]
> Sent: Friday, March 20, 2020 9:38 AM
> To: Yangfei (Felix)
> Cc: gcc-patches@gcc.gnu.org; Zhanghaijian (A)
> Subject: Re: [PATCH PR94026] combine missed opportunity to simplify
>
On Thu, Mar 19, 2020 at 01:43:40AM +, Yangfei (Felix) wrote:
> 2. Given that the patterns for ubfx and ubfiz are already not simple, I am
> afraid the pattern we got by combining the three would be much complex.
> And even more complex when further merged with insn 14 here in order to
>
Hi,
> -Original Message-
> From: Segher Boessenkool [mailto:seg...@kernel.crashing.org]
> Sent: Thursday, March 19, 2020 7:52 AM
> To: Yangfei (Felix)
> Cc: gcc-patches@gcc.gnu.org; Zhanghaijian (A)
> Subject: Re: [PATCH PR94026] combine missed opportunity to simp
Hi!
On Tue, Mar 17, 2020 at 02:05:19AM +, Yangfei (Felix) wrote:
> > Trying 7 -> 8:
> > 7: r99:SI=r103:SI>>0x8
> > REG_DEAD r103:SI
> > 8: r100:SI=r99:SI&0x6
> > REG_DEAD r99:SI
> > Failed to match this instruction:
> > (set (reg:SI 100)
> > (and:SI (lshiftrt:SI
Hi,
> -Original Message-
> From: Segher Boessenkool [mailto:seg...@kernel.crashing.org]
> Sent: Tuesday, March 17, 2020 1:58 AM
> To: Yangfei (Felix)
> Cc: gcc-patches@gcc.gnu.org; Zhanghaijian (A)
> Subject: Re: [PATCH PR94026] combine missed opportunity to simp
On Mon, Mar 16, 2020 at 06:29:39AM +, Yangfei (Felix) wrote:
> Sorry for not getting your point here.
Trying 7 -> 8:
7: r99:SI=r103:SI>>0x8
REG_DEAD r103:SI
8: r100:SI=r99:SI&0x6
REG_DEAD r99:SI
Failed to match this instruction:
(set (reg:SI 100)
(and:SI (lshiftrt:SI
Hi,
> -Original Message-
> From: Segher Boessenkool [mailto:seg...@kernel.crashing.org]
> Sent: Saturday, March 14, 2020 12:07 AM
> To: Yangfei (Felix)
> Cc: gcc-patches@gcc.gnu.org; Zhanghaijian (A)
> Subject: Re: [PATCH PR94026] combine missed opportunity to simp
On Fri, Mar 13, 2020 at 03:21:18AM +, Yangfei (Felix) wrote:
> > On Wed, Mar 04, 2020 at 08:39:36AM +, Yangfei (Felix) wrote:
> > > This is a simple fix for PR94026.
> > > With this fix, combine will try make an extraction if we are in a
> > > equality
> > comparison and this is an
> -Original Message-
> From: Segher Boessenkool [mailto:seg...@kernel.crashing.org]
> Sent: Friday, March 13, 2020 7:50 AM
> To: Yangfei (Felix)
> Cc: gcc-patches@gcc.gnu.org; Zhanghaijian (A)
> Subject: Re: [PATCH PR94026] combine missed opportunity to simplify
>
Hi!
Please Cc: me on combine patches; you sent it nine days ago, and I didn't
see it until now.
On Wed, Mar 04, 2020 at 08:39:36AM +, Yangfei (Felix) wrote:
> This is a simple fix for PR94026.
> With this fix, combine will try make an extraction if we are in a equality
> comparison
> -Original Message-
> From: Jeff Law [mailto:l...@redhat.com]
> Sent: Thursday, March 5, 2020 11:37 PM
> To: Yangfei (Felix) ; gcc-patches@gcc.gnu.org
> Cc: Zhanghaijian (A)
> Subject: Re: [PATCH PR94026] combine missed opportunity to simplify
> comparisons with zero
On Wed, 2020-03-04 at 08:39 +, Yangfei (Felix) wrote:
> Hi,
>
> This is a simple fix for PR94026.
> With this fix, combine will try make an extraction if we are in a equality
> comparison and this is an AND
> with a constant which is power of two minus one. Shift here should be an
>
Hi,
This is a simple fix for PR94026.
With this fix, combine will try make an extraction if we are in a equality
comparison and this is an AND
with a constant which is power of two minus one. Shift here should be an
constant. For example, combine
will transform (compare (and
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