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Date: Fri, 12 May 2017 09:43:00 -0000
From: Hans-Peter Nilsson <hp@bitrange.com>
To: "gcc-patches@gcc.gnu.org" <gcc-patches@gcc.gnu.org>
Subject: Re: [RFC PATCH, i386]: Enable post-reload compare elimination pass
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(To-list pruned, my correction doesn't need attention.)

On Thu, 11 May 2017, Hans-Peter Nilsson wrote:
> On Wed, 10 May 2017, Jakub Jelinek wrote:
>
> > On Wed, May 10, 2017 at 09:57:56PM +0200, Uros Bizjak wrote:
> > > BTW: This patch now catches 417 cases (instead of 200+) in linux
> > > build, including e.g.:
> > >
> > > (parallel [
> > >         (set (reg:CCZ 17 flags)
> > >             (compare:CCZ (lshiftrt:SI (reg:SI 4 si [orig:93 _10 ] [93])
> > >                     (const_int 1 [0x1]))
> > >                 (const_int 0 [0])))
> > >         (set (reg:DI 4 si)
> > >             (zero_extend:DI (lshiftrt:SI (reg:SI 4 si [orig:93 _10 ] [93])
> > >                     (const_int 1 [0x1]))))
> > >     ])

> Anyway, people seem to drift towards the ccreg-last variant

JFTR, I miswrote that; I meant "towards the variant with
ccreg-first" as in Uros' example kept above and as opposed to my
example.

brgds, H-P