jhibbits b685aa9fc1 powerpc: Use builtins for fls/flsl
Summary:
There's no need to use the fallback fls() and flsl() libkern functions
when the PowerISA includes instructions that already do the bulk of the
work.  Take advantage of this through the GCC builtins __builtin_clz()
and __builtin_clzl().

Reviewed by:	luporl
Differential Revision:	https://reviews.freebsd.org/D22340
2019-12-08 04:36:42 +00:00
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