[llvm-bugs] [Bug 31360] New: [X86][SSE] reduceVMULWidth doesn't correctly handle illegal types

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31360

            Bug ID: 31360
           Summary: [X86][SSE] reduceVMULWidth doesn't correctly handle
                    illegal types
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: llvm-dev at redking.me.uk
                CC: craig.topper at gmail.com, llvm-bugs at lists.llvm.org,
                    mkuper at google.com, wmi at google.com
    Classification: Unclassified

Split off from PR31323 (https://llvm.org/bugs/show_bug.cgi?id=31323#c1).

reduceVMULWidth doesn't handle illegal types, specifically types that don't fit
into a 128-bit xmm register a whole number of times, preventing the use of
CONCAT_VECTORS.

A temporary bail out was added in rL289232 to fix PR31323 but this cause
scalarization when legalization fails to do a good job.

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