[llvm-bugs] [Bug 42997] New: [X86] test_sext_4i16_to_4i64 in test/Transforms/SLPVectorizer/X86/sext.ll only half vectorized on avx1 target

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https://bugs.llvm.org/show_bug.cgi?id=42997

            Bug ID: 42997
           Summary: [X86] test_sext_4i16_to_4i64 in
                    test/Transforms/SLPVectorizer/X86/sext.ll only half
                    vectorized on avx1 target
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: craig.topper at gmail.com
                CC: craig.topper at gmail.com, llvm-bugs at lists.llvm.org,
                    llvm-dev at redking.me.uk, spatel+llvm at rotateright.com

This test case loads 4 i8 values and zero extends them to i64. We are forming
one v2i8 vector for the first two loads. But using scalar loads for the other 2
loads.

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