Comment by afdbcreid

It is quite hard to come with a reliable example, but (https://c.godbolt.org/z/56bfYszEb):

    int* p = malloc(sizeof(int));
    int v = *p;
    if (!(v < 0 || v == 0 || v > 0)) {
        exit(1);
    }

This compiles into `exit(1)` in Clang under -O3.