9170 CTFE: Allow reinterpret casts float <-> int #1383
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Only allows the special case *(cast(U*))&e, where e is an expression of type T, T.sizeof == U.sizeof, one type is integral (int, uint, long, ulong) and the other is floating point (float, double, ifloat, idouble). Purpose: allow implementation of HalfFloat.
WalterBright
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Dec 18, 2012
9170 CTFE: Allow reinterpret casts float <-> int
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This a special-case extension to CTFE at Walter's request, to allow the implementation of HalfFloat to be completed. Up to now there has been no way in CTFE to peek into the raw bits of a floating-point type to extract the exponent, etc.
This adds the special case (cast(U))&e, where e is an expression
of type T, T.sizeof == U.sizeof, one type is integral (int, uint, long, ulong) and the other is floating point (float,double, ifloat, idouble).
More general situations will be added later. (Note that there is still no way to extract the components of an 80-bit real).