gcc/testsuite/gcc.target/sh/rte-delay-slot.c

   1 /* { dg-do compile { target { stack_save_isr } } }  */
   2 /* { dg-options "-O2" } */
   3 /* { dg-final { scan-assembler-not "\trte\t\n\tmov.l\t@r15\\+" } } */
   4
   5 /* This test checks if the compiler generates a pop instruction
   6    in the delay slot after rte.  For the sh and sh2, the rte
   7    instruction reads the return pc from the stack and any pop
   8    in the delay slot crashes the hardware.
   9
  10    Incorrect code generated
  11         mov.l   @r15+,r1
  12         rte
  13         mov.l   @r15+,r14
  14
  15    The right code should be
  16
  17         mov.l   @r15+,r1
  18         mov.l   @r15+,r14
  19         rte
  20         nop
  21 */
  22 void INT_MTU2_1_TGIA1 (void)
  23   __attribute__ ((interrupt_handler));
  24 void
  25 INT_MTU2_1_TGIA1 (void)
  26 {
  27   volatile int i = 0;
  28   volatile int x, y;
  29
  30   for (i = 0; i < 10; i++)
  31     y = y + x;
  32 }