sdcc/support/regression/tests/bug-2320.c

   1 /*
   2    bug-2320.c z80 codegen / regalloc interaction issue overwriting register h
   3  */
   4
   5 #include <testfwk.h>
   6
   7 #pragma disable_warning 85
   8 #pragma disable_warning 283
   9
  10 void as(char *c1, const char *c2, unsigned int i)
  11 {
  12         ASSERT(0);
  13 }
  14
  15 extern void p(char *c,...)
  16 {
  17         ASSERT(0);
  18 }
  19
  20 #define a(x) ((x) == 0 ? as(#x, __FILE__, __LINE__):(void)0)
  21
  22 #define BACKING_STORAGE_SIZE 8192
  23 char *buffer;
  24 #define buffer_size (BACKING_STORAGE_SIZE-2)
  25 unsigned buffer_p, buffer_len;
  26 char *buffer_gap;
  27
  28 void buffer_invariants()
  29 {
  30         a(buffer_len <= buffer_size);
  31         a(buffer_p <= buffer_len);
  32
  33         if (buffer_gap != buffer + buffer_size - buffer_len + buffer_p) {
  34                 p("%04x + %04x - %04x + %04x = %04x, not %04x\n",
  35                   buffer, buffer_size, buffer_len, buffer_p,
  36                   buffer + buffer_size - buffer_len + buffer_p,
  37                   buffer_gap);
  38                 a(buffer_gap == buffer + buffer_size - buffer_len + buffer_p);
  39         }
  40 }
  41
  42 void testBug(void)
  43 {
  44         buffer = (unsigned char __xdata *)(0xa5a5);
  45         buffer_len = 1;
  46         buffer_p = 0;
  47         buffer_gap = buffer + buffer_size - buffer_len + buffer_p;
  48         buffer_invariants();
  49 }