Am 11.04.20 um 22:13 schrieb Michael Ring via fpc-devel:
I found this reference manual for floating point instructions:
https://www.st.com/resource/en/programming_manual/dm00046982-stm32-cortexm4-mcus-and-mpus-programming-manual-stmicroelectronics.pdf
and this high level overview:
https://embeddedartistry.com/blog/2017/10/11/demystifying-arm-floating-point-compiler-options/
What is funny is that I did not find FPV4_S16 in the link above, only
*VFPv4-D32,**VFPv4-D16 and ***VFPv4U**
It is probably what Cortex-M4 needs. However, it does not seem to be
completely correct. I'll add fpv4-sp-d16 (it means: single precision
only with 32 registers, but for load/store/move they can be considered
as 16 double registers) and fix everything
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