[llvm-bugs] [Bug 45562] New: BasicTTIImpl.h has many functions that operate on Type that should operate on VectorType

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=45562

            Bug ID: 45562
           Summary: BasicTTIImpl.h has many functions that operate on Type
                    that should operate on VectorType
           Product: libraries
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Common Code Generator Code
          Assignee: unassignedbugs at nondot.org
          Reporter: ctetreau at quicinc.com
                CC: llvm-bugs at lists.llvm.org

Many functions in llvm\include\llvm\CodeGen\BasicTTIImpl.h take pointers to
base Type as arguments and return them as results. However, these objects are
in fact required to be or guaranteed to be VectorType, and are unconditionally
casted to/from.

The amount of casting required in this file and in classes that use it would be
greatly reduced, and the ability to reason about the code would be greatly
increased if these functions operated on VectorType or its subclasses instead.

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