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References: <20221104000432.15254-1-hongyu.wang@intel.com> <c1956a81-56b2-89f7-7419-b2f35d2eadc9@inria.fr>
In-Reply-To: <c1956a81-56b2-89f7-7419-b2f35d2eadc9@inria.fr>
From: Hongyu Wang <wwwhhhyyy333@gmail.com>
Date: Thu, 17 Nov 2022 14:05:12 +0800
Message-ID: <CA+OydWkVqo_kHr4N=BOz-kMiS7y=Sjs3wHvDnxquptge_LktVw@mail.gmail.com>
Subject: Re: [PATCH] Optimize VEC_PERM_EXPR with same permutation index and
 operation [PR98167]
To: Marc Glisse <marc.glisse@inria.fr>
Cc: Hongyu Wang <hongyu.wang@intel.com>, gcc-patches@gcc.gnu.org, hongtao.liu@intel.com
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> I assume the "full permutation" condition is to avoid performing some
> extra operations that would raise exception flags. If so, are there
> conditions (-fno-trapping-math?) where the transformation would be safe
> with arbitrary shuffles?

Yes, that could be an alternative choice with -fno-trapping-math on
arbitrary shuffles. I may have a follow-up patch about this after the
ICE is fixed. Thanks.


> --
> Marc Glisse