Apply a single, repeatable style checklist across all new/modified code:

1) Remove unused/redundant code

• Drop unused #includes and unused variables.
• Don’t add overrides or plumbing that the base class already provides (avoid “override without purpose”).
• Keep diffs focused: avoid unrelated call-site churn when a helper can encapsulate logic.

2) Keep compiler/standard compatibility

• Don’t use C++11-only syntax where the project targets older compilers/standards (e.g., avoid {...} initializer lists).
• Avoid range-based for if the codebase/toolchain constraints require explicit indexing.
• For const objects, ensure initialization is explicitly safe for older clangs (prefer const T t = {}; over uninitialized default construction).

3) Factor preprocessor/SIMD-heavy logic for readability

• When you have long #if/#ifdef blocks for SSE/AVX/AVX512, move the implementation into small helper functions (e.g., packA_*, packB_*, subkernel_*) so the main algorithm focuses on tiling/control flow.

4) Enforce formatting conventions

• Use consistent comment formatting (UTF-8, // comment with a space; keep meaningful text aligned with code).
• Prefer correct preprocessor directives (#if vs #ifdef) and consistent patterns.
• Handle unused parameters cleanly (e.g., (void)opt;).

Example (SIMD factoring)

static void packA_sse(const float* src, float* dst, int k, const Option& opt);
static void packA_avx(const float* src, float* dst, int k, const Option& opt);

for (int i = 0; i < M; i += TILE_M)
{
    // keep tiling/control logic here
    if (j == 0)
    {
#if __SSE2__
#if __AVX__
        packA_avx(A_ptr, AT_ptr, k, opt);
#else
        packA_sse(A_ptr, AT_ptr, k, opt);
#endif
#endif
    }
}