[Bug middle-end/82479] missing popcount builtin detection

[wdijkstr at arm dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82479

Wilco <wdijkstr at arm dot com> changed:

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                 CC|                            |wdijkstr at arm dot com

--- Comment #6 from Wilco <wdijkstr at arm dot com> ---
(In reply to Andrew Pinski from comment #5)
> Was added to LLVM back in 2012:
> http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20121119/156272.html
> 
> Again I don't know how useful it is compared to the compile time that it
> would take.

I'd be more worried that the LLVM sequence isn't better in common usage. Given
it has a fixed high latency, you need quite a few set bits before it's faster.