Intrinsic Fabs()

Adam Ardron

Other Parts Discussed in Thread: TMS320F28377D

Hello,

I am using the TMS320F28377D with compiler version v6.2.7.

In SPRU514G it says that fabs() is implemented as an intrinsics. However, it is also available in the run-time math library and declared in Math.h where other intrinsics are not declared anywhere else.

Looking at the disassembly output an intrinsic is clearly being used for this function, however I am not specifying this anywhere so how would I otherwise know that the intrinsic implementation is being used rather than the library function?

Thanks and regards,

Adam

over 10 years ago

0 George Mock over 10 years ago

TI__Guru**** 251230 points

Adam Ardron said:
how would I otherwise know that the intrinsic implementation is being used rather than the library function?

You have already seen the only ways you can know. The manual mentions it. You can also see it by inspecting the assembly output.

Thanks and regards,

-George

0 Adam Ardron over 10 years ago in reply to George Mock

Intellectual 555 points

Hi George,

Thanks for the reply. Can you point me to where it says this in the manual (and which manual)?

Thanks and regards,

Adam

0 George Mock over 10 years ago in reply to Adam Ardron

TI__Guru**** 251230 points

I was partially incorrect. The C2000 compiler manual does say "the run-time library functions abs() and fabs() are implemented as intrinsics". I didn't notice until just now that it says this in the chapter about the CLA compiler, and not the general C2000 compiler. Even so, fabs is implemented as an instrinsic for C2000.

Thanks and regards,

-George

0 Adam Ardron over 10 years ago in reply to George Mock

Intellectual 555 points

Hi George,

That's fine. Thanks for the clarification.

Kind regards,

Adam

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Intrinsic Fabs()