[llvm-bugs] [Bug 31023] New: Merge r276347 to 3.9.1

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31023

            Bug ID: 31023
           Summary: Merge r276347 to 3.9.1
           Product: new-bugs
           Version: 3.9
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: guy.blank at intel.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

[X86] Do not use AND8ri8 in AVX512 pattern

This variant is (as documented in the TD) for disassembler use only, and should
not be used in patterns - it is longer, and is broken on 64-bit.


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Without this change, illegal instructions could be generated.

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