A strange div bug on Linux x86_64, (both dmd & ldc2): long -5000 / size_t 2 = 9223372036854773308
Adam D. Ruppe
destructionator at gmail.com
Thu Aug 13 19:56:36 UTC 2020
On Thursday, 13 August 2020 at 19:03:38 UTC, H. S. Teoh wrote:
> size_t is unsigned, because the address space of a 64-bit
> machine is 2^64, but a signed value would only be able to
> address half of that space (2^63).
The address bus on existing processors only uses like 48 bits and
even there the lower three are reserved cuz of alignment.
But besides, even if you wanted it all, the signed negative value
has the same bit pattern as the high bit set anyway so it isn't
like the cpu would care, assuming it was actually mapped.
On 32 bit it makes a little more sense to say unsigned but even
there the same bit pattern logic applies anyway.
More information about the Digitalmars-d