gcc/testsuite/gcc.target/i386/pr47602.c

/* { dg-do compile } */
/* { dg-require-effective-target ia32 } */
/* { dg-require-effective-target fpic } */
/* { dg-options "-fPIC" } */

/* Test verifies that %ebx is no longer fixed when generating PIC code on i686.  */

int a, b, c;

void
foo (void)
{
  asm volatile ("movl $0,%%ebx" : : : "ebx");
}