TMS570LC4357: What is the rationale behind ulPortCountLeadingZeros when __clz exists?

user6135372

Part Number: TMS570LC4357
Other Parts Discussed in Thread: HALCOGEN

Why is the FreeRTOS port generated by HALCoGen adding a function ulPortCountLeadingZeros, that is implemtened in assembler, while the compiler/device combination supports __clz()?

I assume that the device supports __clz() as the compiler defines __ARM_FEATURE_CLZ when passing --silicon_version=7R5.

over 3 years ago

+1 QJ Wang over 3 years ago

TI__Guru**** 196226 points

Hi,

The __clz(int src) is a supported intrinsic and can be called from C/C++ code to returns the count of leading zeros. You can use either of them.

0 user6135372 over 3 years ago in reply to QJ Wang

Intellectual 765 points

Thanks for the information.

So there is no benefit using the assembler version?

0 QJ Wang over 3 years ago in reply to user6135372

TI__Guru**** 196226 points

Hi,

I don't see the benefit of using the HAlCoGen generated function (ulPortCountLeadingZeros) if you are using the TI ARM compiler.

0 user6135372 over 3 years ago in reply to QJ Wang

Intellectual 765 points

Thanks!

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TMS570LC4357: What is the rationale behind ulPortCountLeadingZeros when __clz exists?