Bug ID: 37062
Summary: Clang should support _BitscanForward and
_BitscanForward64 in constant expressions
OS: Windows NT
CC: dgre...@apple.com, firstname.lastname@example.org
In MSVC++'s STL, we implemented binary GCD as this can be faster, as it
replaces divisions with bsf. Unfortunately, right now we had to fake bsf with a
loop, resulting in std::gcd actually being slower than a naïve Euclid's
algorithm implementation. This could be substantially faster with real bsf.
Note that C1XX doesn't currently support _BitscanForward in constexpr contexts;
this bug is being filed at the same time it's being filed against C1XX (and
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