[Issue 11508] New: [REG 2.064] Wrong code with -O on x86_64 for char comparisons

[d-bugmail]

https://d.puremagic.com/issues/show_bug.cgi?id=11508

           Summary: [REG 2.064] Wrong code with -O on x86_64 for char
                    comparisons
           Product: D
           Version: D2
          Platform: x86_64
        OS/Version: All
            Status: NEW
          Keywords: wrong-code
          Severity: regression
          Priority: P2
         Component: DMD
        AssignedTo: nob...@puremagic.com
        ReportedBy: thecybersha...@gmail.com


--- Comment #0 from Vladimir Panteleev <thecybersha...@gmail.com> 2013-11-13 
06:39:58 EET ---
bool isWordChar(char c)
{
    return c=='_' || c=='-' || c=='+' || c=='.';
}

void main()
{
    assert(isWordChar('_'));
}

"dmd -O -m64 -run test.d" will cause the above assert to trip.

Happens with 2.064.2 and git HEAD, doesn't happen with 2.063.

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