Hello Kevin,
I know it is considerable more work, but this should move into Newlib.
The
#ifdef __POPCNT__
#define __bitcount64(x) __builtin_popcountll((__uint64_t)(x))
needs GCC support. This __POPCNT__ is a clang feature. I don't know
which version of GCC supports these builtins, but it should use also a
__GNUC_PREREQ__(X, Y).
--
Sebastian Huber, embedded brains GmbH
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