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const HwyTargets = @import("../targets.zig").Targets;
pub fn detect(t: *HwyTargets) i64 {
// All Apple Silicon has AES.
t.neon = true;
// Every Apple chip from A11 (2017) onward has FP16 + DotProd.
// BF16 arrived with M2 / A15 (ARM_BLIZZARD_AVALANCHE, 2022).
// We probe hw.optional.arm.FEAT_BF16 to be precise.
const has_bf16 = darwinSysctlBool("hw.optional.arm.FEAT_BF16");
if (has_bf16) {
t.neon_bf16 = true;
}
// Apple Silicon does not support SVE.
return @bitCast(t.*);
}
fn darwinSysctlBool(comptime name: [:0]const u8) bool {
var value: c_int = 0;
var len: usize = @sizeOf(c_int);
const rc = sysctlbyname(name.ptr, &value, &len, null, 0);
return rc == 0 and value != 0;
}
// We can rely on libc for macOS because libsystem is always available.
extern "c" fn sysctlbyname(
name: [*:0]const u8,
oldp: ?*anyopaque,
oldlenp: ?*usize,
newp: ?*const anyopaque,
newlen: usize,
) c_int;
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