neon_sim

ARM NEON Intrinsics implementation in C++, for accurate understanding of each "neon function".

Usage

Replace

#if __ARM_NEON
#include <arm_neon.h>
#endif // __ARM_NEON

with

#include "neon_sim.hpp"

Features

• Real cross-platform
  • 100% in C/C++, no SSE stuffs
  • "Debuggable inside the intrinsics"
• Closer to native neon usage
  • Support initializer list

    int8x8_t a = { 1, -2, 3, 4, 5, 6, 7, 8 };

  • Support compile time vector type checking

    uint8_t b[4] = { 5, 6, 7, 8 };
    uint16x4_t v_b = vld1_u16(b);

  • Support same-length-different-type conversion(require -flax-vector-conversions sometimes)

Known issues

1. The correctness of the simulation implementation is not guaranteed.
2. However, the accuracy can be improved by adding examples and continuously verifying.
3. Not support inline assembly, i.e. asm volatile("...") stuffs.
4. vgetq_lane_f32(sum_vec, 4) failed to check-and-report index out of bounds of [0, 3] in compile time.