[Bug tree-optimization/90839] Detect lsb ones counting loop (final value replacement?)

[dpochepk at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90839

Dmitrij Pochepko <dpochepk at gmail dot com> changed:

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                 CC|                            |dpochepk at gmail dot com

--- Comment #2 from Dmitrij Pochepko <dpochepk at gmail dot com> ---
aarch64 won't be necessarily faster with such fix.
531.deepsjeng_r on ThunderX2 shows about 0.5% slower numbers with 31-clz(a).