[Bug middle-end/88361] gcc does not unroll loop

[bugzilla@poradnik-webmastera.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88361

--- Comment #1 from Daniel Fruzynski <bugzilla@poradnik-webmastera.com> ---
For reference, this is NEON code which I used on AARCH64:

[code]
void test2()
{
    int n = 0;
    for (; n < SIZE*SIZE-3; n += 4)
    {
        // Copy data
        uint32x4_t v = vld1q_u32((uint32_t*)(&src[0][0] + n));
        vst1q_u32((uint32_t*)(&dst1[0][0] + n), v);

        // Calculate bitmasks
        v = vshlq_u32(vdupq_n_u32(1), vreinterpretq_s32_u32(v));
        vst1q_u32((uint32_t*)(&dst2[0][0] + n), v);
    }

    for (; n < SIZE*SIZE; n++)
    {
        int x = *(&src[0][0] + n);
        *((&dst1[0][0] + n)) = x;
        *((&dst2[0][0] + n)) = 1 << x;
    }
}
[/code]