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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/114943] X86 AVX2: inefficient code generated to convert
 SIMD Vectors
Date: Mon, 06 May 2024 03:57:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114943

Hongtao Liu <liuhongt at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |liuhongt at gcc dot gnu.org

--- Comment #1 from Hongtao Liu <liuhongt at gcc dot gnu.org> ---
For convert3, we already have a patch for it, and will post soon.
For convert, the current loop vectorizer has a limitation to keep the same
vector length while vectorizing, thus generating extra packing/unpacking
instructions compared to convert2. But there's no such limitation in BB
vectorizer, so w/ -O3 -march=3Dx86-64-v3 -fno-tree-loop-vectorize, convert =
is as
good as convert2=