sdcc/support/regression/tests/bug-3779.c

   1 /** bug-3779.c: code generation for sm83 could store a temporary in l, then set up hl for stack access, overwriting the temporary.
   2 */
   3
   4 #include <testfwk.h>
   5
   6 struct State {
   7     unsigned short a;
   8     unsigned char b;
   9 };
  10 static struct State state;
  11
  12 static char glob_var;
  13
  14 #ifdef __SDCC_sm83
  15 static __sfr __at(0xff00) reg; // Use LCD control register for this test, since all its bits are read/write.
  16 #else
  17 unsigned char reg;
  18 #endif
  19
  20 void m(void)
  21 {
  22     state.b = 0;
  23
  24     if (glob_var) {
  25         if (glob_var) {
  26             state.a += 1;
  27         }
  28         if (glob_var) {
  29             state.b = 0;
  30         }
  31
  32         unsigned char foo = state.a >> 1;
  33         foo -= reg;
  34         reg = foo;
  35     }
  36 }
  37
  38 void testBug(void)
  39 {
  40     reg = 0x00;
  41     glob_var = 1;
  42     state.a = 1;
  43     m();
  44     ASSERT(reg == 1);
  45 }
  46