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From: "liuhongt at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/114514] v16qi >> 7 can be optimized with vpcmpgtb
Date: Fri, 29 Mar 2024 01:03:04 +0000 [thread overview]
Message-ID: <bug-114514-4-ubysMbQeBW@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-114514-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114514
--- Comment #3 from Hongtao Liu <liuhongt at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #1)
> Confirmed.
>
> Note non sign bit can be improved too:
> ```
I assume you're talking about broadcast from imm or directly from constant
pool. GCC chooses the former, with -Os we can also generate the later.
According to microbenchmark, the former is better. I also tries to disable
broadcasting from imm and test with stress-ng vecmath, the performance is
similar.
prev parent reply other threads:[~2024-03-29 1:03 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-28 9:38 [Bug target/114514] New: " liuhongt at gcc dot gnu.org
2024-03-28 23:09 ` [Bug target/114514] " pinskia at gcc dot gnu.org
2024-03-28 23:14 ` pinskia at gcc dot gnu.org
2024-03-29 1:03 ` liuhongt at gcc dot gnu.org [this message]
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