why does it use the movl instead of push ?!
- by user554403
hi all.
pay attention to this code :
#include <stdio.h>
void a(int a, int b, int c)
{
char buffer1[5];
char buffer2[10];
}
int main()
{
a(1,2,3);
}
after that :
gcc -S a.c
that command shows our source code in assembly.
now we can see in the main function, we never use "push" command to push the arguments of
the a function into the stack. and it used "movel" instead of that
main:
pushl %ebp
movl %esp, %ebp
andl $-16, %esp
subl $16, %esp
movl $3, 8(%esp)
movl $2, 4(%esp)
movl $1, (%esp)
call a
leave
why does it happen?
what's difference between them?
