Differential D41696 Diff 128804 share/man/man7/simd.7

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share/man/man7/simd.7

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	.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL			.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS			.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)			.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT			.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY			.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF			.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	.\" SUCH DAMAGE			.\" SUCH DAMAGE
	.			.
	.Dd August 31, 2023			.Dd September 2, 2023
	.Dt SIMD 7			.Dt SIMD 7
	.Os			.Os
	.Sh NAME			.Sh NAME
	.Nm simd			.Nm simd
	.Nd SIMD enhancements			.Nd SIMD enhancements
	.			.
	.Sh DESCRIPTION			.Sh DESCRIPTION
	On some architectures, the			On some architectures, the
	.Fx			.Fx
	.Em libc			.Em libc
	provides enhanced implementations of commonly used functions, replacing			provides enhanced implementations of commonly used functions, replacing
	the architecture-independent implementations used otherwise.			the architecture-independent implementations used otherwise.
	Depending on architecture and function, an enhanced			Depending on architecture and function, an enhanced
	implementation of a function may either always be used or the			implementation of a function may either always be used or the
	.Em libc			.Em libc
	detects at runtime which SIMD instruction set extensions are			detects at runtime which SIMD instruction set extensions are
	supported and picks the most suitable implementation automatically.			supported and picks the most suitable implementation automatically.
	On			On
	.Cm amd64 ,			.Cm amd64 ,
	the environment variable			the environment variable
	.Ev ARCHLEVEL			.Ev ARCHLEVEL
	can be used to override this mechanism.			can be used to override this mechanism.
	.Pp			.Pp
	Enhanced functions are present in the following architectures:			Enhanced functions are present in the following architectures:
	.Bl -column FUNCTION________ aarch64_ arm_ amd64_ i386_ ppc64_ -offset indent			.Bl -column FUNCTION_________ aarch64_ arm_ amd64_ i386_ ppc64_ -offset indent
	.It Em FUNCTION Ta Em AARCH64 Ta Em ARM Ta Em AMD64 Ta Em I386 Ta Em PPC64			.It Em FUNCTION Ta Em AARCH64 Ta Em ARM Ta Em AMD64 Ta Em I386 Ta Em PPC64
	.It bcmp Ta Ta Ta S1 Ta S			.It bcmp Ta Ta Ta S1 Ta S
	.It bcopy Ta Ta S Ta S Ta S Ta SV			.It bcopy Ta Ta S Ta S Ta S Ta SV
	.It bzero Ta Ta S Ta S Ta S			.It bzero Ta Ta S Ta S Ta S
	.It div Ta Ta Ta S Ta S			.It div Ta Ta Ta S Ta S
	.It index Ta S Ta Ta S1			.It index Ta S Ta Ta S1
	.It ldiv Ta Ta Ta S Ta S			.It ldiv Ta Ta Ta S Ta S
	.It lldiv Ta Ta Ta S			.It lldiv Ta Ta Ta S
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	.It strlen Ta Ta S Ta S1			.It strlen Ta Ta S Ta S1
	.It strncmp Ta Ta S Ta Ta S			.It strncmp Ta Ta S Ta Ta S
	.It strncpy Ta Ta Ta Ta Ta S2			.It strncpy Ta Ta Ta Ta Ta S2
	.It strnlen Ta Ta Ta S1			.It strnlen Ta Ta Ta S1
	.It strrchr Ta S Ta Ta Ta S			.It strrchr Ta S Ta Ta Ta S
	.It strspn Ta Ta Ta S2			.It strspn Ta Ta Ta S2
	.It swab Ta Ta Ta Ta S			.It swab Ta Ta Ta Ta S
	.It timingsafe_bcmp Ta Ta Ta S1			.It timingsafe_bcmp Ta Ta Ta S1
				.It timingsafe_memcmp Ta Ta Ta S
	.It wcschr Ta Ta Ta Ta S			.It wcschr Ta Ta Ta Ta S
	.It wcscmp Ta Ta Ta Ta S			.It wcscmp Ta Ta Ta Ta S
	.It wcslen Ta Ta Ta Ta S			.It wcslen Ta Ta Ta Ta S
	.It wmemchr Ta Ta Ta Ta S			.It wmemchr Ta Ta Ta Ta S
	.El			.El
	.Pp			.Pp
	.Sy S Ns :\ scalar (non-SIMD),			.Sy S Ns :\ scalar (non-SIMD),
	.Sy 1 Ns :\ amd64 baseline,			.Sy 1 Ns :\ amd64 baseline,
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