AOCL-FFTZ leverages advanced CPU features for optimal performance:
FMA (Fused Multiply-Add) Support: - The library uses FMA3 instructions when available - The FMA compiler flag is added only when compiling AVX512 and AVX256 optimized kernels - The FMA compiler flag is not added for AVX128 during compilation
Runtime Behavior: - Library automatically detects CPU capabilities at runtime - If FMA is not supported by the system, the library falls back to AVX128 kernels - If AVX is not supported, the library executes using standard C implementation
SIMD ISA Support: - The library uses x86 SIMD AVX128, AVX256 and AVX512 instructions when available - Library uses dynamic dispatcher to automatically detect the CPU capabilities and dispatch the optimal ISA kernels based on selector model