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Re: [avr-gcc-list] Tiny bug with inline funcs

From: Denis Chertykov
Subject: Re: [avr-gcc-list] Tiny bug with inline funcs
Date: 18 May 2001 18:29:39 +0400

Ludovic COURTES <address@hidden> writes:

> Hello,
> I noticed a kind of bug with gcc inline funcs. I have two functions f_sin()
> and f_cos() (they compute cosinus and sinus and return a fixed point number)
> which are static inline. When I do
>       f_cos(angle); f_sin(angle);
> angle is not reloaded in between function calls. The matter is that my 
> functions
> (which contains inline asm) stores their argument in Z and then modify it
> (thus, input operand constraint is "Z"(angle) ) ; so the second call doesn't
> have the right value of the argument.
> I fixed it by declaring the argument "static volatile" (so that it is stored 
> in
> SRAM and reloaded when necessary). But is it a normal gcc behaviour ?

Please !
Send me an example too.


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