[Issue 19932] New: ICE: compiler crashes when reading ifloat/idouble as uint/ulong during CTFE

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19932

          Issue ID: 19932
           Summary: ICE: compiler crashes when reading ifloat/idouble as
                    uint/ulong during CTFE
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: n8sh.secondary at hotmail.com

Example:

----
auto getBits(U, T)(const T value)
if (T.sizeof == U.sizeof && T.alignof >= U.alignof && __traits(isUnsigned, U))
{
    return *cast(U*) &value;
}

void main()
{
    const floatBits = getBits!(uint, float)(1.0f); // fine
    const doubleBits = getBits!(ulong, double)(1.0); // fine
    const ifloatBits = getBits!(uint, ifloat)(1.0i); // fine
    const idoubleBits = getBits!(ulong, idouble)(1.0i); // fine

    enum ctfeFloatBits = getBits!(uint, float)(1.0f); // fine
    enum ctfeDoubleBits = getBits!(ulong, double)(1.0); // fine
    //enum ctfeIFloatBits = getBits!(uint, ifloat)(1.0i); // crashes compiler
    //enum ctfeIDoubleBits = getBits!(ulong, idouble)(1.0i); // crashes
compiler
}
----

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