On Fri, Sep 10, 2021 at 5:07 PM Segher Boessenkool
wrote:
>
> On Fri, Sep 10, 2021 at 12:53:37PM +0200, Richard Biener wrote:
> > On Fri, Sep 10, 2021 at 1:50 AM Segher Boessenkool
> > wrote:
> > > And many targets have strange rules for bit-strings in which modes can
> > > be used as bit-strings
On Fri, Sep 10, 2021 at 11:09:31AM +0800, Hongtao Liu wrote:
> On Fri, Sep 10, 2021 at 7:49 AM Segher Boessenkool
> wrote:
> > way too long. But from that same history it follows that anything you
> > do not super carefully (with testing everywhere) will cause some serious
> Frankly, testing ever
On Fri, Sep 10, 2021 at 12:53:37PM +0200, Richard Biener wrote:
> On Fri, Sep 10, 2021 at 1:50 AM Segher Boessenkool
> wrote:
> > And many targets have strange rules for bit-strings in which modes can
> > be used as bit-strings in which other modes, and at what offsets in
> > which registers. Now
On Fri, Sep 10, 2021 at 10:08 PM David Edelsohn wrote:
>
> On Thu, Sep 9, 2021 at 11:03 PM Hongtao Liu wrote:
> >
> > On Fri, Sep 10, 2021 at 7:49 AM Segher Boessenkool
> > wrote:
> > >
> > > On Thu, Sep 09, 2021 at 08:16:16AM +0200, Richard Biener wrote:
> > > > > I think we should (longer term
On Thu, Sep 9, 2021 at 11:03 PM Hongtao Liu wrote:
>
> On Fri, Sep 10, 2021 at 7:49 AM Segher Boessenkool
> wrote:
> >
> > On Thu, Sep 09, 2021 at 08:16:16AM +0200, Richard Biener wrote:
> > > > I think we should (longer term) get rid of the overloaded meanings and
> > > > uses of subregs. One f
On Fri, Sep 10, 2021 at 7:25 PM Hongtao Liu wrote:
>
> On Fri, Sep 10, 2021 at 6:54 PM Richard Biener
> wrote:
> >
> > On Fri, Sep 10, 2021 at 5:03 AM Hongtao Liu wrote:
> > >
> > > On Fri, Sep 10, 2021 at 7:49 AM Segher Boessenkool
> > > wrote:
> > > >
> > > > On Thu, Sep 09, 2021 at 08:16:16A
On Fri, Sep 10, 2021 at 6:54 PM Richard Biener
wrote:
>
> On Fri, Sep 10, 2021 at 5:03 AM Hongtao Liu wrote:
> >
> > On Fri, Sep 10, 2021 at 7:49 AM Segher Boessenkool
> > wrote:
> > >
> > > On Thu, Sep 09, 2021 at 08:16:16AM +0200, Richard Biener wrote:
> > > > > I think we should (longer term)
On Fri, Sep 10, 2021 at 5:03 AM Hongtao Liu wrote:
>
> On Fri, Sep 10, 2021 at 7:49 AM Segher Boessenkool
> wrote:
> >
> > On Thu, Sep 09, 2021 at 08:16:16AM +0200, Richard Biener wrote:
> > > > I think we should (longer term) get rid of the overloaded meanings and
> > > > uses of subregs. One f
On Fri, Sep 10, 2021 at 1:50 AM Segher Boessenkool
wrote:
>
> On Thu, Sep 09, 2021 at 08:16:16AM +0200, Richard Biener wrote:
> > > I think we should (longer term) get rid of the overloaded meanings and
> > > uses of subregs. One fairly simple thing is to make a new rtx code
> > > "bit_cast" (or
On Fri, Sep 10, 2021 at 7:49 AM Segher Boessenkool
wrote:
>
> On Thu, Sep 09, 2021 at 08:16:16AM +0200, Richard Biener wrote:
> > > I think we should (longer term) get rid of the overloaded meanings and
> > > uses of subregs. One fairly simple thing is to make a new rtx code
> > > "bit_cast" (or
On Thu, Sep 09, 2021 at 08:16:16AM +0200, Richard Biener wrote:
> > I think we should (longer term) get rid of the overloaded meanings and
> > uses of subregs. One fairly simple thing is to make a new rtx code
> > "bit_cast" (or is there a nice short more traditional name for it?)
>
> But subreg
On Thu, Sep 09, 2021 at 08:16:16AM +0200, Richard Biener wrote:
> But subreg _is_ bit_cast. What is odd to me is that a "disallowed" subreg
> like (subreg:SF (reg:TI ..) 0) magically becomes valid (in terms of
> validate_subreg) if you rewrite it as (subreg:SF (subreg:SI (reg:TI ..) 0) 0).
> Of co
On Tue, Sep 7, 2021 at 12:12 AM Michael Meissner via Gcc-patches <
gcc-patches@gcc.gnu.org> wrote:
> This patch fixes the breakage in the PowerPC due to a recent change in
> SUBREG
> behavior. While it is arguable that the patch that caused the breakage
> should
> be reverted, this patch should b
On Wed, Sep 8, 2021 at 9:18 PM Segher Boessenkool
wrote:
>
> On Wed, Sep 08, 2021 at 08:39:31PM +0200, Richard Biener wrote:
> > On September 8, 2021 7:08:09 PM GMT+02:00, Segher Boessenkool
> > wrote:
> > >It is not a good idea to do allow all those things. Most backends can
> > >only support
On Thu, Sep 9, 2021 at 3:17 AM Segher Boessenkool
wrote:
>
> On Wed, Sep 08, 2021 at 08:39:31PM +0200, Richard Biener wrote:
> > On September 8, 2021 7:08:09 PM GMT+02:00, Segher Boessenkool
> > wrote:
> > >It is not a good idea to do allow all those things. Most backends can
> > >only support
On Thu, Sep 9, 2021 at 3:17 AM Segher Boessenkool
wrote:
>
> On Wed, Sep 08, 2021 at 08:39:31PM +0200, Richard Biener wrote:
> > On September 8, 2021 7:08:09 PM GMT+02:00, Segher Boessenkool
> > wrote:
> > >It is not a good idea to do allow all those things. Most backends can
> > >only support
On Wed, Sep 08, 2021 at 08:39:31PM +0200, Richard Biener wrote:
> On September 8, 2021 7:08:09 PM GMT+02:00, Segher Boessenkool
> wrote:
> >It is not a good idea to do allow all those things. Most backends can
> >only support a few combinations of them, and everything else results in
> >*worse*
On September 8, 2021 7:08:09 PM GMT+02:00, Segher Boessenkool
wrote:
>Hi!
>
>On Wed, Sep 08, 2021 at 08:42:44AM +0200, Richard Biener wrote:
>> On Wed, Sep 8, 2021 at 1:08 AM Segher Boessenkool
>> wrote:
>> > The core of the problem is that subreg of pseudos has three meanings:
>> > -- Paradox
On Wed, Sep 8, 2021 at 1:10 PM Segher Boessenkool
wrote:
>
> Hi!
>
> On Wed, Sep 08, 2021 at 08:42:44AM +0200, Richard Biener wrote:
> > On Wed, Sep 8, 2021 at 1:08 AM Segher Boessenkool
> > wrote:
> > > The core of the problem is that subreg of pseudos has three meanings:
> > > -- Paradoxical
Hi!
On Wed, Sep 08, 2021 at 08:42:44AM +0200, Richard Biener wrote:
> On Wed, Sep 8, 2021 at 1:08 AM Segher Boessenkool
> wrote:
> > The core of the problem is that subreg of pseudos has three meanings:
> > -- Paradoxical subregs;
> > -- Actual subregs;
> > -- "bit_cast" thingies: treat the
On Tue, Sep 07, 2021 at 06:07:30PM -0500, Segher Boessenkool wrote:
> Hi!
>
> On Tue, Sep 07, 2021 at 03:12:36AM -0400, Michael Meissner wrote:
> > [PATCH] Fix SFmode subreg of DImode and TImode
> >
> > This patch fixes the breakage in the PowerPC due to a recent change in
> > SUBREG
> > behavio
On Wed, Sep 8, 2021 at 1:08 AM Segher Boessenkool
wrote:
>
> Hi!
>
> On Tue, Sep 07, 2021 at 03:12:36AM -0400, Michael Meissner wrote:
> > [PATCH] Fix SFmode subreg of DImode and TImode
> >
> > This patch fixes the breakage in the PowerPC due to a recent change in
> > SUBREG
> > behavior.
>
> But
Hi!
On Tue, Sep 07, 2021 at 03:12:36AM -0400, Michael Meissner wrote:
> [PATCH] Fix SFmode subreg of DImode and TImode
>
> This patch fixes the breakage in the PowerPC due to a recent change in SUBREG
> behavior.
But what was that change? And was that intentional? If so, why wasn't
it document
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