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List:       linux-assembly
Subject:    Gcc extended asm : error
From:       "=?iso-8859-1?q?Rodrigo=20F.=20Baroni?=" <rodrigobaroni () yahoo ! com ! br>
Date:       2003-02-23 22:49:09
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Hello everybody,

      Does anyboby could know where are the problem in
the source attached ? The follow message are given by
gcc:

    asm2.c: In function `main':
    asm2.c:22: Invalid `asm' statement:
    asm2.c:22: fixed or forbidden register 2 (cx) was
spilled for class CREG. 


Rodrigo F Baroni
Computer Science Bach's Student
Sao Paulo, Brazil

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["asm2.txt" (text/plain)]

#include <stdio.h>

#define rep_movsl( src, dest, numwords )	\
	__asm__ __volatile__ ( \
	"cld\n\t" \
	"rep\n\t" \
	"movsl" \
	: : "S" (src), "D" (dest), "c" (numwords) \
	: "%ecx", "%esi", "%edi" )

int main( void )
{
	char *src, *dest;
	int nro = 9;

	src = ( char * ) calloc( 10, sizeof( char ) );
	dest = ( char * ) calloc( 10, sizeof( char) );

	sprintf( src, "%s", "ola mundo" );
	printf( "%s", src );

	rep_movsl( src, dest, 9 );
	
	printf( "%s", dest ); 
	return 0;
}

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