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**
Here:
https://sourceware.org/binutils/docs/as/ARM-Options.html#ARM-Options
I only find |vfpv4|, |vfpv4-d16|, |fpv4-sp-d16| so no idea what FPV4_S16
actually is..
Michael
Am 11.04.20 um 21:42 schrieb Florian Klaempfl:
Am 11.04.2020 um 21:03 schrieb Michael Ring via fpc-devel:
I have now set up new target freertos-arm and want to start playing
arround with freertos.
I have compiled freertos with STM32CubeIDE, only 'problem' is that I
need to compile with floting point enabled, with Soft-Float the build
fails.
For STM32F401RE Chip the C-compiler selects
-mfpu=fpv4-sp-d16 -mfloat-abi=hard
but Freepascal doex not seem to support exactly this abi, I see:
NONE
SOFT
LIBGCC
FPA
FPA10
FPA11
VFPV2
VFPV3
NEON_VFPV3
VFPV3_D16
FPV4_S16
VFPV4
NEON_VFPV4
Which setting should I use? VFPV3_D16 or something else?
Let's just add it. What properties does it have? Do you have know some
reference by heard?
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