extended asm

Ankit Jain ankitjain1580@yahoo.com
Sat Jul 24 09:30:00 GMT 2004

 asm ("leal (%1,%1,4), %0"
: "=r" (x)
: "0" (x) );

till now i was in kowledge that there is somewhat
input and output operand. but i am not able to
understand what this could mean?

asm("movb %3,%0":"=r"(x),"=r"(y):"r"(a),"r"(b));
now what should technically happen is the value in b
should move to x but the fun part is y is also
initialised by same value. why is it so and from where
this value comes from


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