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How to resolve float16 NEON Instructions build errors in ArmRal 21.04?

zadoff

As shown in the screenshot above， there are always building erros when i use some NEON Instruction in float16_t type(such as vaddq_f16)~

I suspect it is ARMRAL_ARCH_COMPILE_OPTIONS issues which need i to modify  "-march=armv8-a+crypto" CACHE INTERNAL ".

I tried many methods and the compilation error still exists。

Can anybody tell me how to resolve this erros?

Thanks a lot!!

Parents
  • 0 Arm Employee Badge in reply to Suyash01

    Hello again.

    On a second look at the error message, it appears that there is a possibility your target architecture may not be compatible with the ACLE vaddq_f16 accumulation function, which compiles to FADD in NEON, or even vmulq_f16 for that matter. This is because half precision floating point intrinsics were only enabled from ArmV8.2-A ISA onwards. Make sure that you have the required target architecture and if that is indeed the case, you can go ahead and use either of  -mcpu/-march =native.

    Meanwhile I am running a diagnosis and trying to reproduce the error on my end.

Reply
  • 0 Arm Employee Badge in reply to Suyash01

    Hello again.

    On a second look at the error message, it appears that there is a possibility your target architecture may not be compatible with the ACLE vaddq_f16 accumulation function, which compiles to FADD in NEON, or even vmulq_f16 for that matter. This is because half precision floating point intrinsics were only enabled from ArmV8.2-A ISA onwards. Make sure that you have the required target architecture and if that is indeed the case, you can go ahead and use either of  -mcpu/-march =native.

    Meanwhile I am running a diagnosis and trying to reproduce the error on my end.

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