Re: [avr-gcc-list] Transfer bit conserved by gcc?

[Ruud Vlaming]

On Sunday 21 September 2008 22:22, you wrote:

> T-bit is used by avr-gcc for internal purpose, the same way as temp reg (r0)
> and cannot be used for storing value.
I see. I looked at it and i cannot get clear in which circumstances,
this is, but it does not really matter i suppose. Point is, you cannot destroy
the value of the Tbit at your liking, although i never saw the Tbit being used 
in my code by gcc.

And how about the H flag? The Half carry is produced by a lot of instructions,
but i never saw the compiler test for it,or make use of it. I looked the avr 
directory over for H flag tests or direct H flag manipulating functions 
(seh, clh, brhc, brhs) and found none.

You would really help me if you know more on this.

Ruud.