On Saturday, 23 April 2016 at 21:04:52 UTC, Nordlöw wrote:
On Saturday, 23 April 2016 at 20:42:25 UTC, Lass Safin wrote:
CPUID: https://en.wikipedia.org/wiki/CPUID.
You can check for the presence of a lot of instructions with
this instruction.
However this will only work on x86 and only run-time.
Code you give a complete code example in D, please or point out
a suitable place in druntime/phobos?
https://dlang.org/phobos/core_cpuid.html#.hasPopcnt
However, it is usually better to use the methods stated by Andrei
/ Dmitry* rather than population count for checking powers of two.
* With the code given by Dmitry you have to check for zero,
otherwise it will return true for 0. e.g. x && !(x & (x - 1))
