[llvm-bugs] [Bug 36336] New: [SelectionDAG] Improve constant pool loads for ComputeKnownBits/NumSignBits

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=36336

            Bug ID: 36336
           Summary: [SelectionDAG] Improve constant pool loads for
                    ComputeKnownBits/NumSignBits
           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

ISD::LOAD handling for ComputeKnownBits/NumSignBits only handle basic EXTLOADs
and range metadata.

It'd be useful to be able to extract constant pool data, including target
specific wrappers such as X86ISelLowering's getTargetConstantFromNode.

This would help ComputeKnownBits/NumSignBits users work with constant vectors
after legalization.

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