Date: Mon, 26 Sep 2022 15:04:20 +0200 From: Alexander Leidinger <Alexander@leidinger.net> To: Dimitry Andric <dim@freebsd.org> Cc: Christian Weisgerber <naddy@mips.inka.de>, Jan Beich <jbeich@freebsd.org>, freebsd-current@freebsd.org Subject: Re: Did clang 14 lose some intrinsics support? Message-ID: <20220926150420.Horde.FuZYvVwObx9ZEQ0mSecOTiA@webmail.leidinger.net> In-Reply-To: <430A830E-3473-4EF4-9605-039F8254999C@FreeBSD.org> References: <YzCL/%2BUEhLy7kHaL@lorvorc.mips.inka.de> <zgen-6zwv-wny@FreeBSD.org> <1A903FD8-D904-4B91-ABC4-2F704F0E2CF4@FreeBSD.org> <YzDKQsfciGd%2BJBQ5@lorvorc.mips.inka.de> <430A830E-3473-4EF4-9605-039F8254999C@FreeBSD.org>
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[-- Attachment #1 --] Quoting Dimitry Andric <dim@freebsd.org> (from Mon, 26 Sep 2022 12:03:03 +0200): > Sure, but if you are compiling without -mavx, why would you want the AVX > intrinsics? You cannot use AVX intrinsics anyway, if AVX is not enabled. > > So I don't fully understand the problem this configure scripting is > supposed to solve? Think about run time check of available CPU features and then using this code for performance critical sections only. Allows to generate programs which are generic to all CPUs in the main code paths, and able to switch to high performance implementations of critical code paths depending on the feature of the CPU. Bye, Alexander. -- http://www.Leidinger.net Alexander@Leidinger.net: PGP 0x8F31830F9F2772BF http://www.FreeBSD.org netchild@FreeBSD.org : PGP 0x8F31830F9F2772BF [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIzBAABCAAdFiEER9UlYXp1PSd08nWXEg2wmwP42IYFAmMxo1MACgkQEg2wmwP4 2Iaxvg/8C9kurtHyy2KIjM9gjkqfYmgZMYBkyNkpuumMiQibY5w6jclYNFVqSfYE h5nB+SeH//GMhee+C4FtRamE9gAsJE2JYhw5nmMv7TDDzrIvtnuvHZMZDhscs0ey nn3wIu569ZLecKh1LklD00u7zUBHNvWsB3BobGIxsG2IQV81BSFnL8yJZTBixPmD 2E0y6jO5oKw9c13CVl+Pzgtua/gbKcWDc0a99xxDe/q3VQ0IUN8sLfwJbD+jWeHZ nA7EmuIs+o0mxOwZF5uiE44ef+1UxRFjuexZ/T2yeVm/Cv+cgigq/clRANRnzhDY 78Tr8VassWhTuJVErIrt6anXrhCUdekXm/AdPOaSfvhgrMUdWThF7e/ppLfPrRb+ y00AlSDYDROEUL4AmRCfytOLGtcDDNpda6B0A/3siZ+uPZH+K6S4BrF6ulHARu5I LLwhegt0tPnWRrYiRtEoFbqrQqE0GsaSQFihadaNh15nqRXkrk24PxMqB2/6tIri 23uwL51IpgxTLKEesmNRTIr6BkH5C0gDM0YaEWgvNPLoZyTa5Iw+sKW+C7xNH3jz wx2rI8jI1a6plIA6wWN6N0FW+AMHDS5xY7SjzgdxA39UIoAQm81hq/8XpE67yfc5 qZeHQ7oaUDO2PZcNbR0fbEoKGhTkaZO6clURErbHZ314hJxKYNs= =Bu1G -----END PGP SIGNATURE-----home | help
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