gcc/testsuite/gcc.dg/tree-ssa/asm-1.c

   1 /* Make sure that gcc understands that an in/out operand is a use as well
   2    as a def.  */
   3
   4 /* { dg-do compile } */
   5 /* { dg-options "-O -fdump-tree-optimized-nouid" } */
   6
   7 void f()
   8 {
   9   int i = 42;
  10   int j = 63;
  11
  12   asm ("": "=m"(i), "+r"(j) : "m"(i));
  13 }
  14
  15 /* { dg-final { scan-tree-dump-times "42" 1 "optimized" } } */
  16 /* { dg-final { scan-tree-dump-times "63" 1 "optimized" } } */