[Issue 7581] New: Compiler uses wrong instructions to move complex value from ST to xmm registers

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=7581

           Summary: Compiler uses wrong instructions to move complex value
                    from ST to xmm registers
           Product: D
           Version: D1 & D2
          Platform: x86_64
        OS/Version: All
            Status: NEW
          Keywords: wrong-code
          Severity: critical
          Priority: P2
         Component: DMD
        AssignedTo: yebblies at gmail.com
        ReportedBy: yebblies at gmail.com


--- Comment #0 from yebblies <yebblies at gmail.com> 2012-02-25 23:43:17 EST ---
Both asserts should pass, but don't because dmd loads the nan onto the fp
stack, stores it into memory _as a double_, then loads it into the xmm
registers as a double and returns it.  The comparison code treats the xmm regs
as if they contain floats, giving the wrong result.

void main()
{
    cfloat a() { return cfloat.nan; }
    assert(a() != 0);
}

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