Programmsize restriction within codeblock

Hello,
are there any restrictions of codesize within a codeblock?

For examle the first code doesn't work:

if ( value ){
        .
        .       many Codelines
        .
}

If i shorten the code above, then it works. i couldn't find out the border to the codesize within the block.

But this Code works correct:

if ( value ){
        myfunction();
}

void myfunction (void){
        .
        .       many Codelines
        .
}

In both cases i don't get any error-messages from the compiler, while compiling.

Thanks for help
Christian Tauschek