On Mon, Jun 21, 2021 at 12:28 PM Jakub Jelinek wrote:
>
> On Mon, Jun 21, 2021 at 12:14:09PM +0200, Richard Biener wrote:
> > > But we could do what I've done in
> > > r11-7694-gd55ce33a34a8e33d17285228b32cf1e564241a70
> > > - have int ix86_last_zero_store_uid;
> > > set to INSN_UID of the last st
On Mon, Jun 21, 2021 at 12:14:09PM +0200, Richard Biener wrote:
> > But we could do what I've done in
> > r11-7694-gd55ce33a34a8e33d17285228b32cf1e564241a70
> > - have int ix86_last_zero_store_uid;
> > set to INSN_UID of the last store emitted by the peephole2s and
> > then check that INSN_UID agai
On Mon, Jun 21, 2021 at 11:59 AM Jakub Jelinek wrote:
>
> On Mon, Jun 21, 2021 at 11:19:12AM +0200, Richard Biener wrote:
> > > --- gcc/config/i386/i386.c.jj 2021-06-21 09:39:21.622487840 +0200
> > > +++ gcc/config/i386/i386.c 2021-06-21 10:21:12.389794740 +0200
> > > @@ -15186,6 +15186,33
On Mon, Jun 21, 2021 at 11:19:12AM +0200, Richard Biener wrote:
> > --- gcc/config/i386/i386.c.jj 2021-06-21 09:39:21.622487840 +0200
> > +++ gcc/config/i386/i386.c 2021-06-21 10:21:12.389794740 +0200
> > @@ -15186,6 +15186,33 @@ ix86_lea_for_add_ok (rtx_insn *insn, rtx
> >return ix86_le
On Mon, Jun 21, 2021 at 10:37 AM Jakub Jelinek via Gcc-patches
wrote:
>
> On Mon, Jun 21, 2021 at 09:18:28AM +0200, Uros Bizjak via Gcc-patches wrote:
> > > 2021-06-20 Roger Sayle
> > >
> > > gcc/ChangeLog
> > > PR target/11877
> > > * config/i386/i386.md: New define_peephole2s
On Mon, Jun 21, 2021 at 09:18:28AM +0200, Uros Bizjak via Gcc-patches wrote:
> > 2021-06-20 Roger Sayle
> >
> > gcc/ChangeLog
> > PR target/11877
> > * config/i386/i386.md: New define_peephole2s to shrink writing
> > 1, 2 or 4 consecutive zeros to memory when optimizing f
On Sun, Jun 20, 2021 at 5:37 PM Roger Sayle wrote:
>
>
> The following patch attempts to resolve PR target/11877 (without
> triggering PR/23102). On x86_64, writing an SImode or DImode zero
> to memory uses an instruction encoding that is larger than first
> clearing a register (using xor) then w
The following patch attempts to resolve PR target/11877 (without
triggering PR/23102). On x86_64, writing an SImode or DImode zero
to memory uses an instruction encoding that is larger than first
clearing a register (using xor) then writing that to memory. Hence,
after reload, the peephole2 pass
