gcc/testsuite/gcc.target/sh/pr54760-4.c

   1 /* Check that the GBR address optimization does not combine a gbr store
   2    and its use when a function call is in between, when GBR is a call used
   3    register, i.e. it is invalidated by function calls.  */
   4 /* { dg-do compile }  */
   5 /* { dg-options "-O1 -fcall-used-gbr" } */
   6 /* { dg-final { scan-assembler "stc\tgbr" } } */
   7
   8 extern int test00 (void);
   9 int
  10 test01 (int x)
  11 {
  12   /* We must see a stc gbr,rn before the function call, because
  13      a function call could modify the gbr.  In this case the user requests
  14      the old gbr value, before the function call.  */
  15   int* p = (int*)__builtin_thread_pointer ();
  16   p[5] = test00 ();
  17   return 0;
  18 }