Nikita Popov dc2b2ae7dc [InstCombine] Fold cttz of lowest set bit ...

cttz(-a & a) is the same as cttz(a). -a & a is an idiom to extract
the lowest set bit, which naturally does not affect the number of
trailing zeroes.

Proof: https://alive2.llvm.org/ce/z/Yp26x7

2023-07-14 14:31:35 +02:00

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