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Show First 20 Lines • Show All 125 Lines • ▼ Show 20 Lines	DEFINE_IFUNC(, size_t, strlen, (const char *))
if (enabled && (cpu_features & CPUID_FAST_STRLEN) != 0)		if (enabled && (cpu_features & CPUID_FAST_STRLEN) != 0)
return (fast_strlen);		return (fast_strlen);
else		else
return (slow_strlen);		return (slow_strlen);
}		}
.Ed		.Ed
.Pp		.Pp
This defines a		This defines a
.Fn strlen		.Xr strlen 3
function with an optimized implementation for CPUs that advertise support.		function with an optimized implementation for CPUs that advertise support.
.Sh SEE ALSO		.Sh SEE ALSO
.Xr elf 5		.Xr elf 5
.Sh NOTES		.Sh NOTES
ifuncs are not supported on all architectures.		ifuncs are not supported on all architectures.
They require both toolchain support, to emit function symbols of type		They require both toolchain support, to emit function symbols of type
.Dv STT_GNU_IFUNC ,		.Dv STT_GNU_IFUNC ,
and kernel linker support to invoke ifunc resolvers during boot or		and kernel linker support to invoke ifunc resolvers during boot or
during module load.		during module load.