How many core cycles take a 32 byte / 16 byte = 16 byte division instruction on a MKL17Z128?

MAPC — Thu, 21 Sep 2017 12:59:42 GMT

Hello,

Can anybody tell me how many core cycles does a 32 byte / 16 bytes = 16 byte division instruction take on a MKL17Z128?

How to optimize the compiler (both in KDS and in MCUXpresso) in order to produce the minimal set of assembly instructions for that?

I haven't found any specific information about that, not even in ARM Cortex M0 Plus Manual.

Best regards,

Marco Coelho

DFAE - Siletec Eletronica

Re: How many core cycles take a 32 byte / 16 byte = 16 byte division instruction on a MKL17Z128?

kerryzhou — Fri, 22 Sep 2017 06:18:12 GMT

Hi Marco,

Actually, the core cycles take a 32 byte / 16 bytes is determined by your IDE code.

I think you can write a small example about 32 byte / 16 bytes in the IDE you are using, then debug the code, check the according asm code.

After you get the according asm code, please refer to my attached document: Cortex-M0+ Technical Reference Manual.pdf.

Page 26, chapter 3.3 Instruction set summary.

You can find each assembler cycles, then just according to table 3-1, to calculate your 32 byte / 16 bytes asm cycles.

Take care, higher optimization will caused smaller ASM code.

Please try it on your side.

If you still have question about it, please let me know!

Have a great day,
Kerry

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topic How many core cycles take a 32 byte / 16 byte = 16 byte division instruction on a MKL17Z128? in Kinetis Microcontrollers

How many core cycles take a 32 byte / 16 byte = 16 byte division instruction on a MKL17Z128?

Re: How many core cycles take a 32 byte / 16 byte = 16 byte division instruction on a MKL17Z128?