Macro gen_dispatcher_codelet 

gen_dispatcher_codelet!() { /* proc-macro */ }

Generate a cached ISA runtime dispatcher for a SIMD codelet.

Emits a function codelet_simd_{size}_cached_{ty}(data, sign) that caches the best ISA level in an AtomicU8 static, avoiding repeated is_x86_feature_detected! / is_aarch64_feature_detected! calls on hot paths. The cached dispatcher delegates to the same arch-specific inner functions as the uncached codelet_simd_{size}<T> dispatcher.

Arguments

• size — DFT size: 2, 4, 8, or 16
• ty — float type: f32 or f64

Priority order (high → low)

• x86_64: AVX-512F > AVX2+FMA > AVX > SSE2 > scalar
• aarch64: NEON > scalar
• other: scalar

Example

gen_dispatcher_codelet!(size = 4, ty = f32);
// emits: pub fn codelet_simd_4_cached_f32(data: &mut [Complex<f32>], sign: i32)