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

From: Frédéric Nadeau
Subject: Re: [avr-libc-dev] eeprom_read_byte and clr ret_hi
Date: Wed, 18 Nov 2009 19:01:03 -0500

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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> AVR-libc-dev mailing list
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Frédéric Nadeau ing. jr

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