sdcc/support/regression/tests/bug-3066.c

   1 /* bug-3066.c
   2    Pointer in register overwritten in the z80 backend when using --reserve-regs-iy.
   3  */
   4
   5 #include <testfwk.h>
   6
   7 #include <stdint.h>
   8
   9 typedef uint16_t atom;
  10
  11 struct node {
  12     atom lhs;
  13     atom rhs;
  14 };
  15
  16 #define MAX_NODES 10
  17
  18 static struct node nodes[MAX_NODES];
  19 uint16_t node_freelist = 0;
  20
  21 atom alloc_node(atom lhsval, atom rhsval)
  22 {
  23     atom a = node_freelist;
  24     node_freelist = nodes[a].lhs;
  25     nodes[a].lhs = lhsval;
  26     nodes[a].rhs = rhsval;
  27     return a;
  28 }
  29
  30 void testBug(void)
  31 {
  32     nodes[0].lhs = 23;
  33
  34     atom a = alloc_node(0xa5a5, 0x5a5a);
  35
  36     ASSERT (nodes[0].lhs == 0xa5a5);
  37     ASSERT (nodes[0].rhs == 0x5a5a);
  38     ASSERT (node_freelist == 23);
  39 }
  40