From: Jeff Law <jeffreyalaw@gmail.com>
To: Andrew Stubbs <ams@codesourcery.com>,
Jeff Law <jlaw@ventanamicro.com>,
"gcc-patches@gcc.gnu.org" <gcc-patches@gcc.gnu.org>
Cc: Jivan Hakobyan <jivanhakobyan9@gmail.com>
Subject: Re: [RFA] New pass for sign/zero extension elimination
Date: Mon, 27 Nov 2023 09:16:41 -0700 [thread overview]
Message-ID: <046b015a-8862-43a3-b30a-4874a0612874@gmail.com> (raw)
In-Reply-To: <2e63f6e7-6a8e-4112-9cdc-aa14fa7c2824@codesourcery.com>
On 11/27/23 04:30, Andrew Stubbs wrote:
> I tried this patch for AMD GCN. We have a similar problem with excess
> extends, but also for vector modes. Each lane has a minimum 32 bits and
> GCC's normal assumption is that vector registers have precisely the
> number of bits they need, so the amdgcn backend patterns have explicit
> sign/zero extends for QImode and HImode for the instructions that might
> need it. It would be cool if this pass could eliminate some of those,
> but at this point I just wanted to check it didn't break anything.
>
> Unfortunately I get a crash building libgcc:
I strongly suspect this is the same thing that was originally reported
by Xi Ruoyao. Just getting back on top of things after the holiday.
I'll get the V2 posted today.
Jeff
next prev parent reply other threads:[~2023-11-27 16:16 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-20 0:47 Jeff Law
2023-11-20 1:22 ` Oleg Endo
2023-11-20 2:51 ` Jeff Law
2023-11-20 2:57 ` Oleg Endo
2023-11-20 2:23 ` Xi Ruoyao
2023-11-20 2:46 ` Jeff Law
2023-11-20 2:52 ` Jeff Law
2023-11-20 3:32 ` Xi Ruoyao
2023-11-20 3:48 ` Jeff Law
2023-11-20 18:26 ` Richard Sandiford
2023-11-22 17:59 ` Jeff Law
2023-11-27 20:15 ` Richard Sandiford
2023-11-20 18:56 ` Dimitar Dimitrov
2023-11-22 22:23 ` Jeff Law
2023-11-26 16:42 ` rep.dot.nop
2023-11-27 16:14 ` Jeff Law
2023-11-27 11:30 ` Andrew Stubbs
2023-11-27 16:16 ` Jeff Law [this message]
2023-12-01 1:08 ` Hans-Peter Nilsson
2023-12-01 15:09 ` Jeff Law
2023-12-01 16:17 ` Hans-Peter Nilsson
2023-11-27 17:36 Joern Rennecke
2023-11-27 17:57 ` Joern Rennecke
2023-11-27 20:03 ` Richard Sandiford
2023-11-27 20:18 ` Jeff Law
2023-11-28 13:36 ` Joern Rennecke
2023-11-28 14:09 ` Joern Rennecke
2023-11-30 17:33 ` Jeff Law
2023-11-28 13:13 ` Joern Rennecke
2023-11-28 5:50 ` Jeff Law
2023-11-27 18:19 Joern Rennecke
2023-11-28 5:51 ` Jeff Law
2023-11-29 17:37 Joern Rennecke
2023-11-29 19:13 ` Jivan Hakobyan
2023-11-30 15:37 ` Jeff Law
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