[llvm-bugs] [Bug 42105] New: [DAGCombine] Improve float vector support in isNegatibleForFree/GetNegatedExpression

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42105

            Bug ID: 42105
           Summary: [DAGCombine] Improve float vector support in
                    isNegatibleForFree/GetNegatedExpression
           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: lebedev.ri at gmail.com, llvm-bugs at lists.llvm.org,
                    spatel+llvm at rotateright.com

We don't peek through build vectors (either to float constants or scalar float
ops) and we use dyn_cast<ConstantFPSDNode> instead of isConstOrConstSplatFP

This isn't motivated by a particular missed optimization, just an observation.

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