Nikita Popov dfb369399d [ValueTracking] Directly use KnownBits shift functions ...

Make ValueTracking directly call the KnownBits shift helpers, which
provides more precise results.

Unfortunately, ValueTracking has a special case where sometimes we
determine non-zero shift amounts using isKnownNonZero(). I have my
doubts about the usefulness of that special-case (it is only tested
in a single unit test), but I've reproduced the special-case via an
extra parameter to the KnownBits methods.

Differential Revision: https://reviews.llvm.org/D151816

2023-06-01 09:46:16 +02:00

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