[llvm-bugs] [Bug 38036] New: ShuffleVectorInst - match shuffle masks with different src/dst vector widths

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38036

            Bug ID: 38036
           Summary: ShuffleVectorInst - match shuffle masks with different
                    src/dst vector widths
           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: a.bataev at hotmail.com, llvm-bugs at lists.llvm.org,
                    spatel+llvm at rotateright.com

The ShuffleVectorInst shuffle matching helpers assume that the src/dst vector
widths are the same (== Mask.size()). We need to generalize this to support src
vector types that are different to the Mask/dst sizes.

This would then allow us to refactor SLPVectorizer's isShuffle function to use
the matchers more generally.

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