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/* bug-2866.c
A bug in rematerialization in the z80 backend.
*/
#include <testfwk.h>
typedef unsigned char uint8;
typedef int int16;
#define COL_MAX_HEIGHT 64
#define COL_TEX_HEIGHT 32
#ifndef __SDCC_pdk14 // Lack of memory
uint8 single_column[COL_MAX_HEIGHT];
void initSingleColumn(int16 height)
{
int16 y;
int16 y0;
int16 y1;
int16 dy;
int16 dv;
int16 v;
y0 = (COL_MAX_HEIGHT - height) >> 1;
y1 = COL_MAX_HEIGHT - y0;
dy = y1 - y0 - 1;
if (dy < 1) dy = 1;
dv = (COL_TEX_HEIGHT << 8) / dy;
v = 0;
if (y0 < 0)
{
v -= y0 * dv;
y0 = 0;
}
if (y1 > COL_MAX_HEIGHT) y1 = COL_MAX_HEIGHT;
for (y = 0; y<y0; y++)
{
single_column[y] = 128;
single_column[COL_MAX_HEIGHT - y - 1] = 64; // Bug resulted in wrong address calculation here.
}
for (y = y0; y < y1; y++)
{
if (v > (31 << 8)) v = 31 << 8;
single_column[y] = (v >> 8);
v+=dv;
}
}
#endif
void testBug(void)
{
#ifndef __SDCC_pdk14 // Lack of memory
initSingleColumn (0);
ASSERT (single_column[0x00] == 0x80);
ASSERT (single_column[0x1f] == 0x80);
ASSERT (single_column[0x20] == 0x40);
ASSERT (single_column[0x3f] == 0x40);
#endif
}
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