gcc/testsuite/gcc.target/powerpc/pr57744.c

   1 /* { dg-do run { target { powerpc*-*-* && lp64 } } } */
   2 /* { dg-skip-if "" { powerpc*-*-darwin* } } */
   3 /* { dg-require-effective-target powerpc_p8vector_ok } */
   4 /* { dg-options "-mdejagnu-cpu=power8 -O3" } */
   5
   6 void abort (void);
   7
   8 typedef unsigned U_16 __attribute__((mode(TI)));
   9
  10 extern int libat_compare_exchange_16 (U_16 *, U_16 *, U_16, int, int)
  11   __attribute__((__noinline__));
  12
  13 /* PR 57744: lqarx/stqcx needs even/odd register pairs.  The assembler will
  14    complain if the compiler gets an odd/even register pair.  Create a function
  15    which has the 16 byte compare and exchange instructions, but don't actually
  16    execute it, so that we can detect these failures on older machines. */
  17
  18 int
  19 libat_compare_exchange_16 (U_16 *mptr, U_16 *eptr, U_16 newval,
  20          int smodel, int fmodel __attribute__((unused)))
  21 {
  22   if (((smodel) == 0))
  23     return __atomic_compare_exchange_n (mptr, eptr, newval, 0, 0, 0);
  24   else if (((smodel) != 5))
  25     return __atomic_compare_exchange_n (mptr, eptr, newval, 0, 4, 0);
  26   else
  27     return __atomic_compare_exchange_n (mptr, eptr, newval, 0, 5, 0);
  28 }
  29
  30 U_16 a = 1, b = 1, c = -2;
  31 volatile int do_test = 0;
  32
  33 int main (void)
  34 {
  35   if (do_test && !libat_compare_exchange_16 (&a, &b, c, 0, 0))
  36     abort ();
  37
  38   return 0;
  39 }