[Issue 6829] Unsigned rotate standard function in Phobos

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http://d.puremagic.com/issues/show_bug.cgi?id=6829



--- Comment #2 from bearophile_h...@eml.cc 2013-07-09 10:13:38 PDT ---
(In reply to comment #1)

> What's the pattern that DMD recognizes for rotate instructions?

Walter offers this example of recognizable rotation:


void test236() {
    uint a;
    int shift;
    a = 7;
    shift = 1;
    int r;
    r = (a >> shift) | (a << (int.sizeof * 8 - shift));
    assert(r == 0x8000_0003);
    r = (a << shift) | (a >> (int.sizeof * 8 - shift));
    assert(a == 7);
}

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