[Issue 10715] New: negated bit test (bt) not recognized by optimizer

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=10715

           Summary: negated bit test (bt) not recognized by optimizer
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: code at dawg.eu


--- Comment #0 from Martin Nowak <code at dawg.eu> 2013-07-25 16:00:35 PDT ---
bool bt(in uint[] ary, size_t bitnum)
{
    return !!(ary[bitnum >> 5] & 1 << (bitnum & 31)); // uses bt
}

bool neg_bt(in uint[] ary, size_t bitnum)
{
    return !(ary[bitnum >> 5] & 1 << (bitnum & 31)); // does not use bt
}

The bit test pattern recognition was added with
https://github.com/D-Programming-Language/dmd/pull/1509. It does not work for
negated bit tests though.

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