mirror of https://github.com/cc65/cc65.git
54 lines
1.1 KiB
C
54 lines
1.1 KiB
C
|
|
/* pr#1461 Fixed pointer subtraction in certain very rare cases */
|
|
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
|
|
static int err = 0;
|
|
|
|
static int a[1], *p;
|
|
static unsigned int i1, i2;
|
|
|
|
int test1(void)
|
|
{
|
|
p = a - (int)a;
|
|
printf("a: %p - (int)a: 0x%x = p: %p\n", a, (int)a, p);
|
|
printf("i1: 0x%x - i2: 0x%x = p: %p\n", i1, i2, i1 - i2);
|
|
if ((int)p != (i1 - i2)) {
|
|
printf("-> failed\n");
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int test2(void)
|
|
{
|
|
p = p - (int)a;
|
|
printf("p: %p - (int)a: 0x%x = p: %p\n", p, (int)a, p);
|
|
printf("p: %p - i2: 0x%x = p: %p\n", p, i2, 0x1234 - i2);
|
|
if ((int)p != (0x1234 - i2)) {
|
|
printf("-> failed\n");
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int main(void)
|
|
{
|
|
a[0] = 0x4711;
|
|
i1 = (int)a;
|
|
i2 = i1 << 1;
|
|
|
|
p = (int*)0x1234;
|
|
printf("p: %p &a[0]: %p a: %p (int)a: 0x%x i1: 0x%x i2: 0x%x\n", p, &a[0], a, (int)a, i1, i2);
|
|
|
|
err += test1();
|
|
|
|
p = (int*)0x1234;
|
|
printf("p: %p &a[0]: %p a: %p (int)a: 0x%x i1: 0x%x i2: 0x%x\n", p, &a[0], a, (int)a, i1, i2);
|
|
|
|
err += test2();
|
|
|
|
return err;
|
|
}
|