Re: GCC assmbler for powerpc-eabi

[Jeff Chimene <jchimene at gmail dot com>]

On 04/05/2009 05:20 PM, marian Szczepkowski wrote:
> Sure, this is what I have as a test as I wanted to look at function call
> overhead, and the compiler used is "powerpc-eabi-gcc (eCosCentric GNU
> tools 4.3.2-sw) 4.3.2", after a bunch of messing around I ended up using
> this to invike the compiler, not that it seemed to make any difference,
> "powerpc-eabi-gcc -S println.c  -finline-functions -fbtr-bb-exclusive
> -fdefer-pop -fwhole-progr". I lay no claim to brilliance with compiler
> options I was primarily just trying to see if the options had any
> effect.
>
>    
I tried this on my box.

A few notes:
o The compiler barfed until I swapped the #define and the #include
o The -finline-functions switch has no effect until one specifies the 
-O3 switch. From TFM:

`-finline-functions'
     Integrate all simple functions into their callers.  The compiler
     heuristically decides which functions are simple enough to be worth
     integrating in this way.

     If all calls to a given function are integrated, and the function
     is declared `static', then the function is normally not output as
     assembler code in its own right.

     Enabled at level `-O3'.

> #define unsigned int size_t
>
>
> #include<stdio.h>
>
> char *pstr ="42";
>
> void myCall(char *cptr)
> {
> 	sprintf(cptr,"Hello baby %f %u", atoi(pstr),atof(pstr));
> }
>
> void main(int argc, char **argv)
> {
> 	char cptr[32];
> 	myCall(&cptr[0]);
> 	printf("%s\n",cptr);
> }
> /* END */
>