sdcc/support/regression/tests/bug-2866.c

   1 /* bug-2866.c
   2    A bug in rematerialization in the z80 backend.
   3  */
   4
   5 #include <testfwk.h>
   6
   7 typedef unsigned char uint8;
   8 typedef int int16;
   9
  10 #define COL_MAX_HEIGHT 64
  11 #define COL_TEX_HEIGHT 32
  12
  13 #ifndef __SDCC_pdk14 // Lack of memory
  14 uint8 single_column[COL_MAX_HEIGHT];
  15
  16 void initSingleColumn(int16 height)
  17 {
  18     int16 y;
  19     int16 y0;
  20     int16 y1;
  21     int16 dy;
  22     int16 dv;
  23     int16 v;
  24
  25     y0 = (COL_MAX_HEIGHT - height) >> 1;
  26     y1 = COL_MAX_HEIGHT - y0;
  27
  28     dy = y1 - y0 - 1;
  29     if (dy < 1) dy = 1;
  30     dv = (COL_TEX_HEIGHT << 8) / dy;
  31     v = 0;
  32
  33     if (y0 < 0)
  34     {
  35         v -= y0 * dv;
  36         y0 = 0;
  37     }
  38     if (y1 > COL_MAX_HEIGHT) y1 = COL_MAX_HEIGHT;
  39
  40     for (y = 0; y<y0; y++)
  41     {
  42         single_column[y] = 128;
  43         single_column[COL_MAX_HEIGHT - y - 1] = 64; // Bug resulted in wrong address calculation here.
  44     }
  45
  46     for (y = y0; y < y1; y++)
  47     {
  48         if (v > (31 << 8)) v = 31 << 8;
  49         single_column[y] = (v >> 8);
  50         v+=dv;
  51     }
  52 }
  53 #endif
  54
  55 void testBug(void)
  56 {
  57 #ifndef __SDCC_pdk14 // Lack of memory
  58     initSingleColumn (0);
  59
  60     ASSERT (single_column[0x00] == 0x80);
  61     ASSERT (single_column[0x1f] == 0x80);
  62     ASSERT (single_column[0x20] == 0x40);
  63     ASSERT (single_column[0x3f] == 0x40);
  64 #endif
  65 }
  66