gcc/testsuite/gcc.target/i386/bittest.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2" } */
   3
   4 extern int dbg_cnt (void);
   5
   6 struct function
   7 {
   8   unsigned int calls_setjmp:1;
   9 };
  10 extern struct function *cfun;
  11 unsigned char
  12 gate_rtl_cprop (void)
  13 {
  14   return !(cfun + 0)->calls_setjmp && dbg_cnt ();
  15 }
  16
  17 /* This should be implementable without performing a bitmask as we can
  18    just use a test imm,mem.  So instructions which load the object from
  19    memory and mask off bits are unnecessary.  In theory we can just count
  20    the move-with-extension, and and testb instructions.  There should be
  21    only one.  */
  22 /* { dg-final { scan-assembler-times "movzbl|and|testb" 1 } } */