http://d.puremagic.com/issues/show_bug.cgi?id=9170
Summary: CTFE: Allow reinterpret casts float <-> int
Product: D
Version: D1 & D2
Platform: All
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P2
Component: DMD
AssignedTo: [email protected]
ReportedBy: [email protected]
--- Comment #0 from Don <[email protected]> 2012-12-17 02:06:33 PST ---
Requested by Walter. This is necessary for implementing things such as
half-float, and is also necessary for implementing printing of floats.
As a bare minimum, the following should be supported:
long testdouble(double x)
{
return *(cast(long*)&x);
}
int testfloat(float x)
{
return *(cast(int*)&x);
}
static assert(testfloat(1.25) == 0x3FA0_0000);
static assert(testdouble(1.25) == 0x3FF4_0000_0000_0000L);
Likewise, converting int->float and long->double should be supported.
(Supporting 80-bit reals is also ultimately necessary but is problematic since
no integral type is large enough to contain the entire value. This means it
inevitably exposes endianness, and also involves creating a pointer into part
of a floating-point value).
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