[fpc-devel] What is the best match for for -mfpu=fpv4-sp-d16 on fpc-arm?

[Michael Ring]

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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