Re: [avr-gcc-list] testsuite saga continues

[Wouter van Gulik]

> I have not dug enough into the details of gcc, but I thought that flags 
> were only visible at a low level, such as in the avr.md file, where you 
> are defining the assembly code sequences for different effects.  Thus it 
> is possible to define a 16-bit addition instruction with an "add, adc" 
> sequence - but you can't really make use of the carry flag after that. 

Yes this is exactly what I wanted to point out. The carry is now only 
used in handwritten assembler (in avr.md). GCC's RTL does not know 
anything about the carry bit being available when it's set/cleared and 
when it's clobbered.

HTH,

Wouter