sdcc/support/regression/tests/bug-2221.c

   1 /*
   2     bug-2221.c
   3 */
   4
   5 #include <testfwk.h>
   6
   7 #ifdef __SDCC_mcs51
   8 #pragma nooverlay
   9 #include <8052.h>
  10
  11 //two functions that use the same registers (but should be in different banks)
  12
  13 unsigned char calculate(unsigned char v1,unsigned char v2)
  14 {
  15         unsigned char v3;
  16         TF2 = 1;                        //trigger the interrupt
  17         v3 = v1 / 2;
  18         return v3 + v1 + v2;
  19 }
  20
  21
  22 unsigned char calculateISR(unsigned char v1,unsigned char v2) __using(1)
  23 {
  24         unsigned char v3;
  25         TF2 = 0;                        //clear the interrupt
  26         v3 = v1 / 2;
  27         return v3 + v1 + v2;
  28 }
  29
  30
  31 unsigned char r1;
  32 unsigned char r2;
  33
  34 void T2_isr(void) __interrupt(5) __using(1)
  35 {
  36         r1 = calculateISR(4,40);
  37
  38         //sdcc eliminates mov psw,0x080
  39         //which is necessary to ensure that calculateISR uses registers from bank 1 to not
  40         //corrupt calculate in main loop
  41 }
  42 #endif
  43
  44 void testBug(void)
  45 {
  46 #if 0 //defined(__SDCC_mcs51) && defined(__SDCC_STACK_AUTO) // TODO:remove STACK_AUTO CONDITION when division support routine becomes reentrant or sdcc optimizes out the call.
  47         TF2 = 0;                                //clear timer 2 interrupt
  48         ET2 = 1;                                //enable timer 2 interrupt
  49         EA = 1;                                 //enable interrupts
  50
  51         r2 = calculate(8,30);
  52         ASSERT(r1 == 46);
  53         ASSERT(r2 == 42);
  54 #endif
  55 }
  56