Date: Wed, 19 Jun 2019 11:32:49 +0200 From: "Sijmen J. Mulder" <ik@sjmulder.nl> To: mayuresh@kathe.in Cc: freebsd-questions@freebsd.org Subject: Re: How are modern processor instructions exposed to userland? Message-ID: <20190619113249.09852c139fe41b79abca8dcd@sjmulder.nl> In-Reply-To: <4b320042bd82ffe9b7793b62719d06f0@kathe.in> References: <4b320042bd82ffe9b7793b62719d06f0@kathe.in>
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Mayuresh Kathe <mayuresh@kathe.in> wrote: > Let's think about the AVX-512 instruction introduced with the latest > Intel Core i9 Skylake-X processor. > I wanted to know how one could use such capabilities via regular C. Unprivileged instructions (like these) are available to all processes. C compilers can and do already emit them when targeting a CPU that supports them (see the "-march" flag). You can also use instrinsics: https://en.wikipedia.org/wiki/Intrinsic_function https://software.intel.com/sites/landingpage/IntrinsicsGuide/ Sijmen
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