[Bug target/120294] Missed DCE with xor when emulating __builtin_ctzg() with __builtin_ctz() and bitshift

[mcccs at gmx dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120294

mcccs at gmx dot com changed:

           What    |Removed                     |Added
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                 CC|                            |mcccs at gmx dot com

--- Comment #2 from mcccs at gmx dot com ---
https://stackoverflow.com/questions/21390165/why-does-breaking-the-output-dependency-of-lzcnt-matter