sdcc/support/regression/tests/bug-2929.c

   1 /*
   2    bug-2929.c
   3
   4    A bug in z80 code generation for ~.
   5 */
   6
   7 #include <testfwk.h>
   8
   9 volatile unsigned char c;
  10 unsigned int i;
  11
  12 void f(void)
  13 {
  14         unsigned int j = (unsigned char)(c + 1);
  15         i = ~j | 0xaa55;
  16 }
  17
  18 void testBug(void)
  19 {
  20         c = 0xff;
  21         f();
  22         ASSERT((i & 0xffffu) == 0xffffu);
  23
  24         c = 0x00;
  25         f();
  26         ASSERT((i & 0xffffu) == 0xffffu);
  27
  28         c = 0xfe;
  29         f();
  30         ASSERT((i & 0xffffu) == 0xff55u);
  31 }
  32