[Issue 8060] New: xmmstore cannot allocate store for optimized operation that uses int and floats

[d-bugmail]

http://d.puremagic.com/issues/show_bug.cgi?id=8060

           Summary: xmmstore cannot allocate store for optimized operation
                    that uses int and floats
           Product: D
           Version: D1 & D2
          Platform: x86_64
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nob...@puremagic.com
        ReportedBy: fa...@gmx.ch


--- Comment #0 from Fawzi Mohamed <fa...@gmx.ch> 2012-05-07 13:51:45 PDT ---
float invSqrt(float x) {
    union fi {
    float f;
    int i;
    }
    fi v;
    float xhalf = 0.5f * x;
    v.f = x;
    v.i = 0x5f375a86 - (v.i >> 1);
    float y = x * v.f;
    float z = y*(1.5f - xhalf * y * y);
    return z;
}

or

float invSqrt(float x) {
    float xhalf = 0.5f * x;
    int i = *cast(int*)&x;
    i = 0x5f375a86 - (i >> 1);
    x = *cast(float*)&i;
    x = x*(1.5f - xhalf * x * x);
    return x;
}

fails with error

tym = xa
Internal error: ../ztc/cgxmm.c 567

when compiled with dmd 1.074 or 2.059 with -O

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