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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/115517] Fix x86 regressions after dropping uses of vcond{,u,eq}_optab
Date: Tue, 18 Jun 2024 08:39:33 +0000 [thread overview]
Message-ID: <bug-115517-4-WbSKH6776I@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-115517-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115517
--- Comment #2 from Hongtao Liu <liuhongt at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #1)
> Btw, I had opened PR115490 with my results for this already. Some mitigation
> should be from optimizing ISEL expansion to vcond_mask and I'd start with
> looking at some of the fallout from that side (note that might require
> the backend reject not natively implemented vec_cmp via its operand 1
> predicate)
w/o AVX512, vector integer comparison only supports EQ/GT, others comparison
rtx_cost is transformed to that. (.i.e GTU is emulated with us_minus + eq +
negative the vector mask)
If we restrict the predicate of operand 1, would middle-end reject
vectorization (or lower it to scalar version)?
next prev parent reply other threads:[~2024-06-18 8:39 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-06-17 8:05 [Bug target/115517] New: Fix regression " liuhongt at gcc dot gnu.org
2024-06-18 6:20 ` [Bug target/115517] Fix x86 regressions " rguenth at gcc dot gnu.org
2024-06-18 8:39 ` liuhongt at gcc dot gnu.org [this message]
2024-06-18 10:49 ` rguenther at suse dot de
2024-06-18 11:08 ` liuhongt at gcc dot gnu.org
2024-06-18 11:17 ` rguenther at suse dot de
2024-06-18 11:29 ` liuhongt at gcc dot gnu.org
2024-07-01 5:20 ` cvs-commit at gcc dot gnu.org
2024-07-01 5:20 ` cvs-commit at gcc dot gnu.org
2024-07-01 5:20 ` cvs-commit at gcc dot gnu.org
2024-07-01 5:21 ` cvs-commit at gcc dot gnu.org
2024-07-01 5:21 ` cvs-commit at gcc dot gnu.org
2024-07-01 5:21 ` cvs-commit at gcc dot gnu.org
2024-07-01 5:21 ` cvs-commit at gcc dot gnu.org
2024-07-01 5:26 ` liuhongt at gcc dot gnu.org
2024-07-01 5:27 ` liuhongt at gcc dot gnu.org
2024-07-01 6:45 ` rguenth at gcc dot gnu.org
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