Difference: FloatingPointUnit (38 vs. 39)

Revision 392022-11-20 - PeterSchmid

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Performance Estimation

Changed:

<
< All measurements and calculation are based on the Cortex M4F MCU STM32WB55 @ 32 MHz.

>
> All measurements and calculation are based on the Cortex M4F MCU STM32WB55 @ 32 MHz.

Simple test program to estimate execution time of fsin and fsqrt:

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;

Changed:

<
< With fsin it takes about 7 ms, without about 1 ms for 1000 iterations. Therefore a fsin word takes about 6 us.

>
> With fsin it takes about 7 ms, without about 1 ms for 1000 iterations. Therefore a fsin word takes about 6 us. For the !STM32F405 @ 168 MHz, the fsin takes about 2 us.

Changed:

<
< fsqrt takes also about 2 ms for 1000 iterations. Therefore a fsin word takes about 1 us or less.

>
> fsqrt takes also about 2 ms for 1000 iterations. Therefore a fsqrt word takes about 1 us or less (the same time as f/, see below).

Basic operations like f/ are defined as inline. First check fsin and f/ with the builtin disassembler:

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