>
> Perhaps someone is interested in the following thread from LKML:
>
> "[PATCH v2] x86: prevent gcc from emitting rep movsq/stosq for inlined ops"
>
> https://lore.kernel.org/lkml/20250605164733.737543-1-mjgu...@gmail.com/
>
> There are several PRs regarding memcpy/memset linked from the abov
On Fri, Jun 13, 2025 at 3:15 PM Cui, Lili wrote:
> > > On Mon, Apr 21, 2025 at 7:24 AM H.J. Lu wrote:
> > > >
> > > > On Sun, Apr 20, 2025 at 6:31 PM Jan Hubicka wrote:
> > > > >
> > > > > > PR target/102294
> > > > > > PR target/119596
> > > > > > * config/i386/x86-tune-costs
> -Original Message-
> From: Jan Hubicka
> Sent: Monday, April 21, 2025 6:35 PM
> To: H.J. Lu
> Cc: gcc-patches@gcc.gnu.org; Liu, Hongtao ;
> ubiz...@gmail.com
> Subject: Re: [PATCH v2] x86: Update memcpy/memset inline strategies for -
> mtune=generic
>
&g
On Mon, Apr 21, 2025 at 6:34 PM Jan Hubicka wrote:
>
> > On Mon, Apr 21, 2025 at 7:24 AM H.J. Lu wrote:
> > >
> > > On Sun, Apr 20, 2025 at 6:31 PM Jan Hubicka wrote:
> > > >
> > > > > PR target/102294
> > > > > PR target/119596
> > > > > * config/i386/x86-tune-costs.h (generic
> On Mon, Apr 21, 2025 at 7:24 AM H.J. Lu wrote:
> >
> > On Sun, Apr 20, 2025 at 6:31 PM Jan Hubicka wrote:
> > >
> > > > PR target/102294
> > > > PR target/119596
> > > > * config/i386/x86-tune-costs.h (generic_memcpy): Updated.
> > > > (generic_memset): Likewise.
> > > >
On Mon, Apr 21, 2025 at 7:24 AM H.J. Lu wrote:
>
> On Sun, Apr 20, 2025 at 6:31 PM Jan Hubicka wrote:
> >
> > > PR target/102294
> > > PR target/119596
> > > * config/i386/x86-tune-costs.h (generic_memcpy): Updated.
> > > (generic_memset): Likewise.
> > > (generic_co
On Sun, Apr 20, 2025 at 6:31 PM Jan Hubicka wrote:
>
> > PR target/102294
> > PR target/119596
> > * config/i386/x86-tune-costs.h (generic_memcpy): Updated.
> > (generic_memset): Likewise.
> > (generic_cost): Change CLEAR_RATIO to 17.
> > * config/i386/x86-tune.
> PR target/102294
> PR target/119596
> * config/i386/x86-tune-costs.h (generic_memcpy): Updated.
> (generic_memset): Likewise.
> (generic_cost): Change CLEAR_RATIO to 17.
> * config/i386/x86-tune.def (X86_TUNE_PREFER_KNOWN_REP_MOVSB_STOSB):
> Add m_GENERIC
> On Sun, Apr 20, 2025 at 4:19 AM Jan Hubicka wrote:
> >
> > > On Tue, Apr 8, 2025 at 3:52 AM H.J. Lu wrote:
> > > >
> > > > Simplify memcpy and memset inline strategies to avoid branches for
> > > > -mtune=generic:
> > > >
> > > > 1. With MOVE_RATIO and CLEAR_RATIO == 17, GCC will use integer/ve
On Sun, Apr 20, 2025 at 4:19 AM Jan Hubicka wrote:
>
> > On Tue, Apr 8, 2025 at 3:52 AM H.J. Lu wrote:
> > >
> > > Simplify memcpy and memset inline strategies to avoid branches for
> > > -mtune=generic:
> > >
> > > 1. With MOVE_RATIO and CLEAR_RATIO == 17, GCC will use integer/vector
> > >lo
> On Tue, Apr 8, 2025 at 3:52 AM H.J. Lu wrote:
> >
> > Simplify memcpy and memset inline strategies to avoid branches for
> > -mtune=generic:
> >
> > 1. With MOVE_RATIO and CLEAR_RATIO == 17, GCC will use integer/vector
> >load and store for up to 16 * 16 (256) bytes when the data size is
> >
On Tue, Apr 8, 2025 at 3:52 AM H.J. Lu wrote:
>
> Simplify memcpy and memset inline strategies to avoid branches for
> -mtune=generic:
>
> 1. With MOVE_RATIO and CLEAR_RATIO == 17, GCC will use integer/vector
>load and store for up to 16 * 16 (256) bytes when the data size is
>fixed and kn
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