Here is a simple test case that shows the bug:
#include <stdio.h>
int
main()
{
int i = 16;
__int64 j = 16;
unsigned __int64 n;
// Use %p to show all bits
n = 0x7fffffffffff;
printf("Init: n=%p, sizeof(n) = %d\n", n, sizeof(n)); // == 8 Ok!
n = 0x7fffffffffff;
n = n / i; // i is an int
printf("Wrong: n=%p\n", n);
n = 0x7fffffffffff;
n = n / j; // j is an __int64
printf("Wrong: n=%p\n", n);
n = 0x7fffffffffff;
n = n / 16;
printf("Good: n=%p\n", n);
}
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