gcc/testsuite/gcc.dg/attr-isr-nosave_low_regs.c

   1 /* { dg-do compile { target { { sh-*-* sh[1234ble]*-*-* } && nonpic } } } */
   2 /* { dg-options "-O" } */
   3
   4 extern void bar ();
   5
   6 void foo ()
   7 {
   8 }
   9
  10 #pragma interrupt
  11 void ( __attribute__ ((nosave_low_regs)) isr) ()
  12 {
  13   bar ();
  14 }
  15
  16 void delay(int a)
  17 {
  18 }
  19
  20 /* { dg-final { scan-assembler-times "rte" 1} } */
  21 /* A call will clobber all call-saved registers, but because of
  22    #pragma nosave_low_regs, r0..r7 need not be saved/restored.
  23    One of these registers will also do fine to hold the function address.
  24    Call-saved registers r8..r13 also don't need to be restored.  */
  25 /* { dg-final { scan-assembler-not "\[^f\]r\[0-9\]\[ \t\]*," } } */
  26 /* { dg-final { scan-assembler-not "\[^f\]r\[89\]" } } */
  27 /* { dg-final { scan-assembler-not "\[^f\]r1\[,0-3\]" } } */
  28 /* { dg-final { scan-assembler-times "macl" 2} } */