v1.2.1 contains following fixes:
- [dsp] Call appropriate NEON butterfly functions in NE10_fft_int32.neon.c
- [dsp] Prevent overflow by moving scaling in front of butterfly
- [dsp] Link stdc++ for static build
- [all] Switch to intrinsic on iOS
- [dsp] Fix NE10_INLINE_ASM_OPT for RFFT
- [math] Limit the range of input to avoid the failed tests in math module
- [dsp] Fix test_suite_fft_int32.c fails under armv7
- For 4-point and 8-point FFTs, we fall back to VFP because they are too short for NEON optimizations
- [all] Main fuction in tests return 0 if all tests pass
- [all] Enable neon code on ARM32 in physics, dsp and image modules
It also contains a small improvement:
- [dsp] Improve data layout in RFFT float32