[llvm-bugs] [Bug 38969] New: [X86][AVX] Convert X86SubVBroadcast into a memory-opcode

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38969

            Bug ID: 38969
           Summary: [X86][AVX] Convert X86SubVBroadcast into a
                    memory-opcode
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          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,
                    spatel+llvm at rotateright.com

vbroadcastf128 etc are always subvector broadcasts from memory.

We should convert the X86SubVBroadcast opcode into a true memory-opcode and
remove the 'fallback' tablegen patterns currently necessary in case the
subvector has multiple users.

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