Compiler/TM4C129DNCPDT: Any issues with TI C/C++ optimization and floating point corruption?

Don Carlson2

Tool/software: TI C/C++ Compiler

I have been using the TM4C129 with FreeRTOS, and using the FPU. I am calling the FPULazyStackingEnable() and have verified the FreeRTOS context switching is saving/restoring the S16-S31 FPU registers.

Initial debugging and running all appears just fine. But when I turn on the compiler optimizations, I begin to see floating point corruption? Has anyone else experienced issues with optimization and floating point?

Using:
CCS v7
TI C/C++ ARM 16.9.4.LTS
TM4C129DNCPDT

Thanks,
Don ...

over 8 years ago

0 Ralph Jacobi over 8 years ago

TI__Guru*** 135355 points

Hello Don,

From what I have looked into, I don't see any known issues with optimizations and floating point. Can you describe in more detail what you mean by corruption? Is it the results being returned are wrong? If so, by how much?

0 Don Carlson2 over 8 years ago in reply to Ralph Jacobi

Intellectual 410 points

Hi Ralph,

Further review of the code found a slight timing issue between a PWM interrupt and setting up a DMA SPI transfer for an external ADC. Timing issue resolved, and there is no issue with the floating point.

This thread can be closed.

Thanks,
Don ...

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Compiler/TM4C129DNCPDT: Any issues with TI C/C++ optimization and floating point corruption?