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

   1 /* { dg-do compile { target "sh-*-*" } } */
   2 /* { dg-options "-O2" } */
   3 /* { dg-skip-if "" { "sh*-*-*" } "*" "-m1 -m2*" }  */
   4 /* { dg-final { scan-assembler-not "\trte\t\n\tmov.l\t@r15\\+" } } */
   5
   6 /* This test checks if the compiler generates a pop instruction
   7    in the delay slot after rte.  For the sh and sh2, the rte
   8    instruction reads the return pc from the stack and any pop
   9    in the delay slot crashes the hardware.
  10
  11    Incorrect code generated
  12         mov.l   @r15+,r1
  13         rte
  14         mov.l   @r15+,r14
  15
  16    The right code should be
  17
  18         mov.l   @r15+,r1
  19         mov.l   @r15+,r14
  20         rte
  21         nop
  22 */
  23 void INT_MTU2_1_TGIA1 (void)
  24   __attribute__ ((interrupt_handler));
  25 void
  26 INT_MTU2_1_TGIA1 (void)
  27 {
  28   volatile int i = 0;
  29   volatile int x, y;
  30
  31   for (i = 0; i < 10; i++)
  32     y = y + x;
  33 }