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added test for issue #1461

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mrdudz 2021-04-28 14:21:48 +02:00
parent 71bd6415d6
commit f3663b8d2e
1 changed files with 53 additions and 0 deletions
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test/val/pr1461.c Normal file
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/* 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;
}