Re: [avr-gcc-list] __zero_reg__

[Anich Gregor]

Hi!

When the program is interrupted it is absolutely possible that the zero-reg is 
not zero at this time because it is defined to be zero whenever a C function 
is called - you can do with it whatever you want to as long as you make sure 
that you set it to zero again before giving control back to 
compiler-generated code because it depends on that ;)

HTH,
 --blight

On Sunday 22 February 2004 12:04, Kang Tin LAI wrote:
> Hi,
>
> The signal() prologue:
>
>       push __zero_reg__
>       push __tmp_reg__
>       in __tmp_reg__,__SREG__
>       push __tmp_reg__
>       clr __zero_reg__
>
> __zero_reg__ push and then cleared, does it imply that __zero_reg__ may
> hold a value other than zero?

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