Re: [avr-libc-dev] eeprom_read_byte and clr ret_hi

[Frédéric Nadeau]

http://www.nongnu.org/avr-libc/user-manual/FAQ.html#faq_reg_usage
This explain the why. Not sure about the ABI

On Wed, Nov 18, 2009 at 6:53 PM, Shaun Jackman <address@hidden> wrote:
> eeprom_read_byte returns a uint8_t. Why does it clear r25?
> eerd_byte.S:
>        clr     ret_hi
>
> Does the AVR ABI require that r25 be zeroed in a function returning a
> single byte? If not, this instruction could be removed.
>
> Cheers,
> Shaun
>
>
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-- 
Frédéric Nadeau ing. jr