[llvm-bugs] [Bug 39689] New: TargetLowering::SimplifyDemandedBits - improve vector support

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39689

            Bug ID: 39689
           Summary: TargetLowering::SimplifyDemandedBits - improve vector
                    support
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Common Code Generator Code
          Assignee: unassignedbugs at nondot.org
          Reporter: llvm-dev at redking.me.uk
                CC: llvm-bugs at lists.llvm.org, spatel+llvm at rotateright.com
            Blocks: 39549

We need to improve vector type support in SimplifyDemandedBits:

ISD::TRUNCATE (DAGCombiner.visitTRUNCATE currently disables this)
ISD::EXTRACT_VECTOR_ELT
ISD::INSERT_VECTOR_ELT
ISD::SCALAR_TO_VECTOR
ISD::VECTOR_SHUFFLE


Referenced Bugs:

https://bugs.llvm.org/show_bug.cgi?id=39549
[Bug 39549] [X86] SimplifyDemandedBits fails to remove a zero vector input from
unpckh
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