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[DS-5] How to use the compiler intrinsic __softfp?

Note: This was originally posted on 8th September 2013 at http://forums.arm.com

It's good to know that it's possible to override the global compiler option --fpu=vfpv4 for specific functions with the compiler intrinsic __softfp.

http://infocenter.arm.com/help/topic/com.arm.doc.dui0491i/BABGAEBD.html

But for some reason, I cannot get it to work.


__softfp void myFunction(float a, float 
{
..
..
..
}

When I declare a function like above it's time for a syntax error. I must be doing something wrong.

Could someone tell me how to use the __softfp intrinsic properly?

Thanks in advance

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Simon Craske over 12 years ago

Note: This was originally posted on 9th September 2013 at http://forums.arm.com

__softfp float add(float a, float b) { return a + b; }
Compiled with "armcc --cpu=cortex-m4 --fpu=vfpv4 -S" should produce:

add PROC VMOV s1,r0 VMOV s0,r1 VADD.F32 s0,s1,s0 VMOV r0,s0 BX lr ENDP
hth
s.

[Edited to remove emoticon induced error in code snippet]
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Simon Craske over 12 years ago

Note: This was originally posted on 9th September 2013 at http://forums.arm.com

__softfp float add(float a, float b) { return a + b; }
Compiled with "armcc --cpu=cortex-m4 --fpu=vfpv4 -S" should produce:

add PROC VMOV s1,r0 VMOV s0,r1 VADD.F32 s0,s1,s0 VMOV r0,s0 BX lr ENDP
hth
s.

[Edited to remove emoticon induced error in code snippet]
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