On 9/21/2021 6:54 AM, Roger Sayle wrote:
That define_insn is making my eyes bleed! I think that's the most convincing
argument I've ever read on gcc-patches, and I can see now what Segher is so
opposed to.
Then you haven't seen enough patterns or your eyes haven't toughened up
through the ye
On 9/21/2021 6:01 AM, Richard Sandiford via Gcc-patches wrote:
[Using this is a convenient place to reply to the thread as a whole]
Richard Biener via Gcc-patches writes:
On Mon, Sep 6, 2021 at 12:15 PM Segher Boessenkool
wrote:
On Sun, Sep 05, 2021 at 11:28:30PM +0100, Roger Sayle wrote:
2
To: Richard Biener via Gcc-patches
Cc: Segher Boessenkool ; Richard Biener
; Roger Sayle
Subject: Re: [PATCH] Simplify paradoxical subreg extensions of TRUNCATE
[Using this is a convenient place to reply to the thread as a whole]
Richard Biener via Gcc-patches writes:
> On Mon, Sep 6, 2
On Tue, Sep 21, 2021 at 08:24:04AM +0200, Richard Biener wrote:
> On Tue, Sep 21, 2021 at 6:18 AM Jeff Law via Gcc-patches
> wrote:
> > If we were catching the scenario which led to the creation of (subreg
> > (truncate)) in combine and instead of creating (subreg (truncate)) we
> > instead create
On Mon, Sep 20, 2021 at 10:18:15PM -0600, Jeff Law wrote:
> On 9/20/2021 6:23 PM, Segher Boessenkool wrote:
> >There is no such thing as "earlier than simplify-rtx", that is the
> >point. simplify-rtx is not a pass: it is like a library that is used
> >from all over the RTL routines.
> I'm referri
[Using this is a convenient place to reply to the thread as a whole]
Richard Biener via Gcc-patches writes:
> On Mon, Sep 6, 2021 at 12:15 PM Segher Boessenkool
> wrote:
>>
>> On Sun, Sep 05, 2021 at 11:28:30PM +0100, Roger Sayle wrote:
>> > This patch simplifies the RTX (subreg:HI (truncate:QI
On Tue, Sep 21, 2021 at 6:18 AM Jeff Law via Gcc-patches
wrote:
>
>
>
> On 9/20/2021 6:23 PM, Segher Boessenkool wrote:
> > Hi!
> >
> > On Sun, Sep 19, 2021 at 09:14:55AM -0600, Jeff Law wrote:
> >> On 9/6/2021 8:24 AM, Segher Boessenkool wrote:
> >>> On Mon, Sep 06, 2021 at 12:32:13PM +0100, Roge
On 9/20/2021 6:23 PM, Segher Boessenkool wrote:
Hi!
On Sun, Sep 19, 2021 at 09:14:55AM -0600, Jeff Law wrote:
On 9/6/2021 8:24 AM, Segher Boessenkool wrote:
On Mon, Sep 06, 2021 at 12:32:13PM +0100, Roger Sayle wrote:
I think the current documentation is sufficient. During compilation,
GC
Hi!
On Sun, Sep 19, 2021 at 09:14:55AM -0600, Jeff Law wrote:
> On 9/6/2021 8:24 AM, Segher Boessenkool wrote:
> >On Mon, Sep 06, 2021 at 12:32:13PM +0100, Roger Sayle wrote:
> >>I think the current documentation is sufficient. During compilation,
> >>GCC's
> >>combine pass will often substitute
On 9/6/2021 8:24 AM, Segher Boessenkool wrote:
Hi!
On Mon, Sep 06, 2021 at 12:32:13PM +0100, Roger Sayle wrote:
I think the current documentation is sufficient. During compilation, GCC's
combine pass will often substitute a register with an expression defining
it's value, and then attempt t
Hi!
On Mon, Sep 06, 2021 at 12:32:13PM +0100, Roger Sayle wrote:
> I think the current documentation is sufficient. During compilation, GCC's
> combine pass will often substitute a register with an expression defining
> it's value, and then attempt to simplify it. As you point out, this often
>
?
Let me know what you think.
Best regards,
Roger
--
-Original Message-
From: Segher Boessenkool
Sent: 06 September 2021 11:14
To: Roger Sayle
Cc: 'GCC Patches'
Subject: Re: [PATCH] Simplify paradoxical subreg extensions of TRUNCATE
On Sun, Sep 05, 2021 at 11:28:30PM
On Mon, Sep 6, 2021 at 12:15 PM Segher Boessenkool
wrote:
>
> On Sun, Sep 05, 2021 at 11:28:30PM +0100, Roger Sayle wrote:
> > This patch simplifies the RTX (subreg:HI (truncate:QI (reg:SI))) as
> > (truncate:HI (reg:SI)), and closely related variants.
>
> Subregs of other than regs are undefined
On Sun, Sep 05, 2021 at 11:28:30PM +0100, Roger Sayle wrote:
> This patch simplifies the RTX (subreg:HI (truncate:QI (reg:SI))) as
> (truncate:HI (reg:SI)), and closely related variants.
Subregs of other than regs are undefined in RTL. You will first have to
define this (in documentation as well
This patch simplifies the RTX (subreg:HI (truncate:QI (reg:SI))) as
(truncate:HI (reg:SI)), and closely related variants. In RTL, a
paradoxical SUBREG where the outermode is wider than the innermode
is like the extensions zero_extend or sign_extend, but where we
don't care about the contents of t
15 matches
Mail list logo
