...@gcc.gnu.org;
jeffreya...@gmail.com
Subject: Re: [PATCH] loading float member of parameter stored via int registers
Hi!
On Fri, Dec 30, 2022 at 12:30:04AM -0800, Andrew Pinski wrote:
> On Thu, Dec 29, 2022 at 11:45 PM Segher Boessenkool
> wrote:
> > Ah! This
Hi!
On Fri, Dec 30, 2022 at 12:30:04AM -0800, Andrew Pinski wrote:
> On Thu, Dec 29, 2022 at 11:45 PM Segher Boessenkool
> wrote:
> > Ah! This simply shows rs6000_modes_tieable_p is decidedly non-optimal:
> > it does not allow tying a scalar float to anything else. No such thing
> > is required
Hi,
Andrew Pinski writes:
> On Thu, Dec 29, 2022 at 11:45 PM Segher Boessenkool
> wrote:
>>
>> Hi!
>>
>> On Fri, Dec 30, 2022 at 10:22:31AM +0800, Jiufu Guo wrote:
>> > Considering the limitations of CSE, I try to find other places
>> > to handle this issue, and notice DSE can optimize below
On Thu, Dec 29, 2022 at 11:45 PM Segher Boessenkool
wrote:
>
> Hi!
>
> On Fri, Dec 30, 2022 at 10:22:31AM +0800, Jiufu Guo wrote:
> > Considering the limitations of CSE, I try to find other places
> > to handle this issue, and notice DSE can optimize below code:
> > "[sfp:DI]=x:DI ; y:SI=[sfp:DI]"
Hi!
On Fri, Dec 30, 2022 at 10:22:31AM +0800, Jiufu Guo wrote:
> Considering the limitations of CSE, I try to find other places
> to handle this issue, and notice DSE can optimize below code:
> "[sfp:DI]=x:DI ; y:SI=[sfp:DI]" to "y:SI=x:DI#0".
>
> So, I drafted a patch to update DSE to handle DI-
Hi,
Jiufu Guo via Gcc-patches writes:
> Hi,
>
> Jiufu Guo via Gcc-patches writes:
>
>> Hi,
>>
>> Segher Boessenkool writes:
>>
>>> On Fri, Dec 23, 2022 at 08:13:48PM +0100, Richard Biener wrote:
> Am 23.12.2022 um 17:55 schrieb Segher Boessenkool
> :
> There are at least six ve
Hi,
Jiufu Guo via Gcc-patches writes:
> Hi,
>
> Segher Boessenkool writes:
>
>> On Fri, Dec 23, 2022 at 08:13:48PM +0100, Richard Biener wrote:
>>> > Am 23.12.2022 um 17:55 schrieb Segher Boessenkool
>>> > :
>>> > There are at least six very different kinds of subreg:
>>> >
>>> > 0) Lvalue su
Hi,
Segher Boessenkool writes:
> On Fri, Dec 23, 2022 at 08:13:48PM +0100, Richard Biener wrote:
>> > Am 23.12.2022 um 17:55 schrieb Segher Boessenkool
>> > :
>> > There are at least six very different kinds of subreg:
>> >
>> > 0) Lvalue subregs. Most archs have no use for it, and it can be
Hi,
Segher Boessenkool writes:
> Hi!
>
> On Fri, Dec 23, 2022 at 08:36:36PM +0800, Jiufu Guo wrote:
>> It seems some limitations there. e.g. 1. "subreg:DF on DI register"
>> may not work well on pseudo,
>
> It is perfectly normal:
> A hard register may be accessed in various modes throughout o
On Fri, Dec 23, 2022 at 08:13:48PM +0100, Richard Biener wrote:
> > Am 23.12.2022 um 17:55 schrieb Segher Boessenkool
> > :
> > There are at least six very different kinds of subreg:
> >
> > 0) Lvalue subregs. Most archs have no use for it, and it can be
> > expressed much more clearly and cle
> Am 23.12.2022 um 17:55 schrieb Segher Boessenkool
> :
>
> On Fri, Dec 23, 2022 at 05:20:09PM +0100, Richard Biener wrote:
Am 23.12.2022 um 15:48 schrieb Segher Boessenkool
:
>>> None of this belongs in generic code at all imo. At expand time it
>>> should be expanded to somethin
On Fri, Dec 23, 2022 at 05:20:09PM +0100, Richard Biener wrote:
> > Am 23.12.2022 um 15:48 schrieb Segher Boessenkool
> > :
> > None of this belongs in generic code at all imo. At expand time it
> > should be expanded to something that works and can be optimised well,
> > so not anything with :BL
> Am 23.12.2022 um 15:48 schrieb Segher Boessenkool
> :
>
> Hi!
>
>> On Fri, Dec 23, 2022 at 08:36:36PM +0800, Jiufu Guo wrote:
>> It seems some limitations there. e.g. 1. "subreg:DF on DI register"
>> may not work well on pseudo,
>
> It is perfectly normal:
> A hard register may be access
Hi!
On Fri, Dec 23, 2022 at 08:36:36PM +0800, Jiufu Guo wrote:
> It seems some limitations there. e.g. 1. "subreg:DF on DI register"
> may not work well on pseudo,
It is perfectly normal:
A hard register may be accessed in various modes throughout one
function, but each pseudo register is giv
HI,
Jiufu Guo via Gcc-patches writes:
> Hi,
>
> Richard Biener writes:
>
>> On Thu, 22 Dec 2022, guojiufu wrote:
>>
>>> Hi,
>>>
>>> On 2022-12-21 15:30, Richard Biener wrote:
>>> > On Wed, 21 Dec 2022, Jiufu Guo wrote:
>>> >
>>> >> Hi,
>>> >>
>>> >> This patch is fixing an issue about parame
Hi,
Segher Boessenkool writes:
> On Thu, Dec 22, 2022 at 11:28:01AM +, Richard Biener wrote:
>> On Thu, 22 Dec 2022, Jiufu Guo wrote:
>> > To reduce risk, I'm just draft straightforward patches for
>> > special cases currently, Like:
>> > https://gcc.gnu.org/pipermail/gcc-patches/2022-Decemb
On Thu, Dec 22, 2022 at 11:28:01AM +, Richard Biener wrote:
> On Thu, 22 Dec 2022, Jiufu Guo wrote:
> > To reduce risk, I'm just draft straightforward patches for
> > special cases currently, Like:
> > https://gcc.gnu.org/pipermail/gcc-patches/2022-December/608081.html
> > and this patch.
>
>
On Thu, 22 Dec 2022, Jiufu Guo wrote:
>
> Hi,
>
> Richard Biener writes:
>
> > On Thu, 22 Dec 2022, guojiufu wrote:
> >
> >> Hi,
> >>
> >> On 2022-12-21 15:30, Richard Biener wrote:
> >> > On Wed, 21 Dec 2022, Jiufu Guo wrote:
> >> >
> >> >> Hi,
> >> >>
> >> >> This patch is fixing an issue
Hi,
Richard Biener writes:
> On Thu, 22 Dec 2022, guojiufu wrote:
>
>> Hi,
>>
>> On 2022-12-21 15:30, Richard Biener wrote:
>> > On Wed, 21 Dec 2022, Jiufu Guo wrote:
>> >
>> >> Hi,
>> >>
>> >> This patch is fixing an issue about parameter accessing if the
>> >> parameter is struct type and
On Thu, 22 Dec 2022, guojiufu wrote:
> Hi,
>
> On 2022-12-21 15:30, Richard Biener wrote:
> > On Wed, 21 Dec 2022, Jiufu Guo wrote:
> >
> >> Hi,
> >>
> >> This patch is fixing an issue about parameter accessing if the
> >> parameter is struct type and passed through integer registers, and
> >>
Hi,
On 2022-12-21 15:30, Richard Biener wrote:
On Wed, 21 Dec 2022, Jiufu Guo wrote:
Hi,
This patch is fixing an issue about parameter accessing if the
parameter is struct type and passed through integer registers, and
there is floating member is accessed. Like below code:
typedef struct DF
On Wed, 21 Dec 2022, Jiufu Guo wrote:
> Hi,
>
> This patch is fixing an issue about parameter accessing if the
> parameter is struct type and passed through integer registers, and
> there is floating member is accessed. Like below code:
>
> typedef struct DF {double a[4]; long l; } DF;
> double
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