[LLVMbugs] [Bug 24085] New: r241927 caused some minor regressions on x86

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=24085

            Bug ID: 24085
           Summary: r241927 caused some minor regressions on x86
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: escha at apple.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

This improvement to computeKnownBits allowed SelectionDAG to shrink some
constants more than before, which caused some minor regressions on x86 (see the
changes to tests in the commit). As in the Phabricator review of that patch,
this is a suboptimality in the x86 backend (presumably).

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