//! Architecture-specific SIMD backends for the Mel-fbank inner-loop kernels.
//!
//! Each submodule here is gated on the target architecture it targets.
//! The public dispatcher in [`super::dispatch`] selects among them at
//! call boundaries.
//!
//! Layout mirrors `colconv-be-tier10b/src/row/arch/`. `aarch64` ships
//! NEON; `x86_64` ships SSE4.1, AVX2+FMA, and AVX-512F backends with
//! a runtime-feature-detected cascade in [`super::dispatch`]. wasm32
//! falls through to scalar.
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