Re: [avr-gcc-list] odd behaviour with type casting

[Georg-Johann Lay]

Paul Thomas schrieb:
> I'm getting very wrong math in one instance using a casting,  negative
> numbers and a division. If I don't do any 1 of those three things it
> works fine. This is with an atxmega32a4 using both the atmel avr-gcc
> 4.5.1 (avr-gcc (AVR_8_bit_GNU_Toolchain_3.2.3_314) 4.5.1) as well as
> 4.5.1 gcc built with the script from AvrFreaks. The code snippet to
> demonstrate this is: ...

Without a minimal example that *compiles* and is legal C code no one 
will be able to say anything about this.  Same for guessing the compiler 
options.

With almost 99.9% certainty your problem is somewhere else; not in the 
arithmetic and not in the cast.

4.5.x has PR46779 and PR39633 open, for example, but with obfuscated 
code there is no clue...

Johann