gcc/testsuite/gcc.target/i386/pr85034.c

/* PR inline-asm/85034 */
/* { dg-do compile } */
/* { dg-options "-O2" } */

void
foo (void)
{
  volatile float a;
  struct S { char a; } b = { 0 };
  asm volatile ("" : "=r" (a) : "0ir" (b));
}