musl/src/stdlib/bsearch.c, branch master musl - an implementation of the standard library for Linux-based systems bsearch: simplify and optimize 2018年07月23日T19:14:29+00:00 Fangrui Song i@maskray.me 2018年07月22日T00:34:00+00:00 3d8322c7ad659210a4c8770ef455ca729ce7f395 maintainer's note: the key observation here is that the compared element is the first slot of the second ceil(half) of the array, and thus can be removed for further comparison when it does not match, so that we descend into the second ceil(half)-1 rather than ceil(half) elements. this change ensures that nel strictly decreases with each iteration, so that the case of != but nel==1 does not need to be special-cased anymore. 
maintainer's note: the key observation here is that the compared
element is the first slot of the second ceil(half) of the array, and
thus can be removed for further comparison when it does not match, so
that we descend into the second ceil(half)-1 rather than ceil(half)
elements. this change ensures that nel strictly decreases with each
iteration, so that the case of != but nel==1 does not need to be
special-cased anymore.
initial check-in, version 0.5.0 2011年02月12日T05:22:29+00:00 Rich Felker dalias@aerifal.cx 2011年02月12日T05:22:29+00:00 0b44a0315b47dd8eced9f3b7f31580cf14bbfc01

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