On Mon, Jun 30, 2025 at 7:05 PM Alexander Monakov wrote:
>
>
> On Mon, 30 Jun 2025, Richard Biener wrote:
>
> > > * gcc.target/i386/pr116979.c
> > >
> > > Here we check that FMA is used for complex multiplication. This is a case
> > > where use of FMA is detrimental for accuracy, but I guess we ca
On Mon, 30 Jun 2025, Richard Biener wrote:
> > * gcc.target/i386/pr116979.c
> >
> > Here we check that FMA is used for complex multiplication. This is a case
> > where use of FMA is detrimental for accuracy, but I guess we can choose
> > to preserve the status quo. I can look into teaching
> > e
On Mon, Jun 30, 2025 at 9:54 AM Richard Biener
wrote:
>
> On Fri, Jun 27, 2025 at 3:45 PM Alexander Monakov wrote:
> >
> >
> > On Fri, 27 Jun 2025, Richard Biener wrote:
> >
> > > > I am testing partial fixes for these issues.
> > >
> > > Can you check again after r16-1731-g08bdb6b4a32f1f?
> >
>
On Fri, Jun 27, 2025 at 3:45 PM Alexander Monakov wrote:
>
>
> On Fri, 27 Jun 2025, Richard Biener wrote:
>
> > > I am testing partial fixes for these issues.
> >
> > Can you check again after r16-1731-g08bdb6b4a32f1f?
>
> Certainly. There's no more fmaddsub-related testsuite failures, and only
>
On Fri, 27 Jun 2025, Richard Biener wrote:
> > I am testing partial fixes for these issues.
>
> Can you check again after r16-1731-g08bdb6b4a32f1f?
Certainly. There's no more fmaddsub-related testsuite failures, and only
three tests need adjustment on x86.
* gcc.target/i386/pr116979.c
Here
On Wed, Jun 25, 2025 at 11:39 AM Richard Biener
wrote:
>
> On Tue, Jun 24, 2025 at 5:25 PM Alexander Monakov wrote:
> >
> > > I'd say we want to fix these kind of things before switching the default.
> > > Can
> > > you file bugreports for the distinct issues you noticed when adjusting the
> >
On Tue, Jun 24, 2025 at 5:25 PM Alexander Monakov wrote:
>
> > I'd say we want to fix these kind of things before switching the default.
> > Can
> > you file bugreports for the distinct issues you noticed when adjusting the
> > testcases?
>
> Sure, filed https://gcc.gnu.org/bugzilla/show_bug.cgi
> > On Fri, May 23, 2025 at 2:31 PM Alexander Monakov
> > wrote:
> > >
> > > In PR 105965 we accepted a request to form FMA instructions when the
> > > source code is using a narrow generic vector that contains just one
> > > element, corresponding to V1SF or V1DF mode, while the backend does not
On Tue, 24 Jun 2025, Richard Biener wrote:
> On Tue, Jun 24, 2025 at 1:18 PM Alexander Monakov wrote:
> >
> > > > On Fri, May 23, 2025 at 2:31 PM Alexander Monakov
> > > > wrote:
> > > > >
> > > > > In PR 105965 we accepted a request to form FMA instructions when the
> > > > > source code is
On Tue, Jun 24, 2025 at 4:28 PM Alexander Monakov wrote:
>
> > > Thanks! Any thoughts on the other patch in the thread, about flipping
> > > -ffp-contract from =fast to =on?
> >
> > I can't find this mail, not in spam either, but I'm OK with such change if
> > it
> > comes with test coverage.
>
>
> I'd say we want to fix these kind of things before switching the default. Can
> you file bugreports for the distinct issues you noticed when adjusting the
> testcases?
Sure, filed https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120808 for the most
frequently hit issue on x86 for now.
> I suppose
> > Thanks! Any thoughts on the other patch in the thread, about flipping
> > -ffp-contract from =fast to =on?
>
> I can't find this mail, not in spam either, but I'm OK with such change if it
> comes with test coverage.
Ouch, let me reproduce it below. About test coverage, I'm not exactly sure w
On Tue, Jun 24, 2025 at 1:53 PM Alexander Monakov wrote:
>
>
>
> On Tue, 24 Jun 2025, Richard Biener wrote:
>
> > On Tue, Jun 24, 2025 at 1:18 PM Alexander Monakov
> > wrote:
> > >
> > > > > On Fri, May 23, 2025 at 2:31 PM Alexander Monakov
> > > > > wrote:
> > > > > >
> > > > > > In PR 105965
On Tue, Jun 24, 2025 at 1:18 PM Alexander Monakov wrote:
>
> > > On Fri, May 23, 2025 at 2:31 PM Alexander Monakov
> > > wrote:
> > > >
> > > > In PR 105965 we accepted a request to form FMA instructions when the
> > > > source code is using a narrow generic vector that contains just one
> > > >
On Mon, 26 May 2025, Richard Biener wrote:
> On Fri, May 23, 2025 at 2:31 PM Alexander Monakov wrote:
> >
> > In PR 105965 we accepted a request to form FMA instructions when the
> > source code is using a narrow generic vector that contains just one
> > element, corresponding to V1SF or V1DF mo
On Fri, May 23, 2025 at 2:31 PM Alexander Monakov wrote:
>
> In PR 105965 we accepted a request to form FMA instructions when the
> source code is using a narrow generic vector that contains just one
> element, corresponding to V1SF or V1DF mode, while the backend does not
> expand fma patterns fo
In PR 105965 we accepted a request to form FMA instructions when the
source code is using a narrow generic vector that contains just one
element, corresponding to V1SF or V1DF mode, while the backend does not
expand fma patterns for such modes.
For this to work under -ffp-contract=on, we either ne
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