Antworten: Re: Antworten: Re: [avr-gcc-list] Problem with the calling convention

[Martin Krüger]

 Ursprüngliche Nachricht ------- 
Von: address@hidden (Joerg Wunsch) 
Datum: Wed, 14 Jul 2004 18:06:57 +0200 (MET DST) 
Betreff: Re: Antworten: Re: [avr-gcc-list] Problem with the calling convention 

"Martin Krüger "  wrote:

> avr-gcc -c -Os  test.c (without optimization the code seems to be ok)
> 
> avr-objdump -D test.o

>You could have called avr-gcc with -S directly instead. ;-)

My personal preference.
I like the output of objdump better :-)


> The we will see the call to testfunc32
> 
> mov     r25, r19
> mov     r24, r18
> mov     r23, r17
> mov     r22, r16
> rcall   .+0

>That's quite OK.

> This code is executed after all the other function-calls.
> Any of these could have modified the values of  r19,r18

>Sure, but since they are not used again afterwards, this is not a
>problem.

It is a problem because the possibly modified content of r18/r19 is
passed to testfunc32() .


>Please submit a GCC bug report for this (but use my addition, since it
>makes the bug obvious).

Do you have any hint how to do so?
I never made a GCC bug report.


Martin Kruger

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