Craig Topper 9abc593e98 [TargetLowering][InstCombine] Simplify BSwap demanded bits code a little. NFC ...

Use alignDown instead of &= ~7.

Replace ResultBit with NLZ. (BitWidth - NLZ - NTZ == 8) so
(BitWidth - NTZ - 8 == NLZ).

Reviewed By: spatel

Differential Revision: https://reviews.llvm.org/D117804

2022-01-20 10:45:17 -08:00

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