[Issue 23521] Bad conversion in double.to!long for values around long.max

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23521

Nick Treleaven <nick at geany.org> changed:

           What    |Removed                     |Added
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                 CC|                            |nick at geany.org

--- Comment #1 from Nick Treleaven <nick at geany.org> ---
to!long(double) calls toImpl which just does cast(long). The problem seems to
be that casting a value bigger than 9223372036854775295 to long gives a
negative result:

    long l = 9223372036854775296;
    assert(l < long.max);
    double d = cast(double)l;
    assert(cast(long)d > 0); // fails

However C with gcc does the same:

    double d = 9223372036854775296L;
    assert((long)d > 0); // fails

--