Re: [avr-gcc-list] dev and mod may not be optimized

[Eric Pasquier]

Just a correction : div() take 2 parameters :

 

div_t t;

t=div(c, 10);

a=t.quot;

b=t.rem;

 

 

Eric.

----- Original Message -----

From: Albert Andras

To: address@hidden

Sent: Tuesday, December 11, 2007 4:16 PM

Subject: Re: [avr-gcc-list] dev and mod may not be optimized

----- Original Message -----

From: "Nathan Moore" <address@hidden>

> unsigned char a, b, c;
> c = some_input_function();
> LABEL:
> a = c/10;
> b = c%10;
> ...
>
> *****************************************
> LABEL:
> mov r24,r18
> ldi r22,lo8(10)
> call __udivmodqi4
> mov r19,r24
> .LM436:
> mov r24,r18
>  call __udivmodqi4
>
> If I'm understanding __udivmodqi4 it produces the results of both of
> these with one call. 

Acording to:

http://www.nongnu.org/avr-libc/user-manual/structdiv__t.html

 

you could do:

 

div_t t;

t=div(c/10);

a=t.quot;

b=t.rem;

????

 

 

Andras

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