main/gcc/testsuite/gcc.target/arm/thumb-find-work-register.c

   1 /* Wrong method to get number of arg reg will cause argument corruption.  */
   2 /* { dg-do run } */
   3 /* { dg-require-effective-target arm_eabi } */
   4 /* { dg-options "-mthumb -O1" } */
   5
   6 extern void abort (void);
   7
   8 int foo (int, int, int, int) __attribute__((noinline));
   9
  10 int
  11 foo (int a, int b, int c, int d)
  12 {
  13   register int m asm ("r8");
  14
  15   m = a;
  16   m += b;
  17   m += c;
  18   m += d;
  19
  20   asm ("" : "=r" (m) : "0" (m));
  21
  22   return m;
  23 }
  24
  25 int
  26 main ()
  27 {
  28   volatile int a = 10;
  29   volatile int b = 20;
  30   volatile int c = 30;
  31   volatile int d = 40;
  32   volatile int sum = 0;
  33
  34   sum = foo (a, b, c, d);
  35
  36   if (sum != 100)
  37     abort ();
  38
  39   return 0;
  40 }