Changing the Rounding Style

[jacobfw]

So from the research I've done, it looks like the answer is a no, but I figured I'd throw a hail mary and ask here.

Is there a way to set the rounding style for floating point arithmetic (+,-,*,/)?
Note, I am NOT referring to round(), trunc() etc in Math.h
This would be the equivalent of fesetround()

I've already looked through the documentation for AVR-libc as well as a lot of useless google results, and found nada, so it looks like it's not, but again, hail mary.

Thanks

[groundFungus]

@jacobfw

Note, I am NOT referring to round(), trunc() etc in Math.h

Then what are you looking for?

[paulpaulson]

Hello
Do your calculation in scaled int.

[jacobfw]

As I stated just below that line, it would be the equivalent of fesetround

[jacobfw]

That is looking like it's the only way, but I really don't want to. I've had to do that before and it's much slower, as well as much more error prone.

[paulpaulson]

Hello
Don´t forget the Arduino hasn't have a FP unit to do this faster.

[PaulRB]

Can't the same thing be done by checking the sign and then adding or subtracting 0.5 before truncating? You could define some macros that use the ternary operator, for example.

[johnwasser]

It looks like ARM-based, ESP8266, and ESP32 processors support the 'fenv.h' and 'cfenv' include files. You're out of luck with the AVR processors.