[Issue 12164] Function returning ptrdiff_t.min in 64-bit returning 0 when -O is set.

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=12164



--- Comment #3 from yebblies <yebblies at gmail.com> 2014-03-07 18:49:05 EST ---
Reduced:

ptrdiff_t compare(A* rhsPA, A* zis)
{
    if (*rhsPA == *zis)
        return 0;
    return ptrdiff_t.min;
}

struct A
{
    int a;
}

void main()
{
    auto a = A(3);
    auto b = A(4);
    assert(!compare(&a, &b));
}

The backend tried to emit OPmemcmp and screws it up somehow, probably missing a
REX_W prefix or two.

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