[PATCH] D23296: [ValueTracking] Improve ValueTracking on left shift with nsw flag

[Li Huang via llvm-commits]

lihuang updated this revision to Diff 68234.
lihuang added a comment.

Hi Sanjoy,

This change is mostly same as before, but with the fix for PR28946 added in computeKnownBitsFromShiftOperator.


https://reviews.llvm.org/D23296

Files:
  lib/Analysis/ValueTracking.cpp
  test/Analysis/ValueTracking/known-signbit-shift.ll

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