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[Bug target/88013] can't vectorize rgb to grayscale conversion code
- From: "hoganmeier at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 14 Nov 2018 09:02:03 +0000
- Subject: [Bug target/88013] can't vectorize rgb to grayscale conversion code
- Auto-submitted: auto-generated
- References: <bug-88013-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88013
--- Comment #3 from krux <hoganmeier at gmail dot com> ---
A few NEON instructions are sufficient:
https://web.archive.org/web/20170227190422/http://hilbert-space.de/?p=22
clang seems to generate similar code, see the godbolt links.