[llvm-bugs] [Bug 40019] New: [X86][VBMI2] Refactor vpshldv instructions as funnel shifts

via llvm-bugs llvm-bugs at lists.llvm.org
Fri Dec 14 02:10:58 PST 2018


            Bug ID: 40019
           Summary: [X86][VBMI2] Refactor vpshldv instructions as funnel
           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,
                    llvm-dev at redking.me.uk, spatel+llvm at rotateright.com

These can be treated as generic funnel shift intrinsics, and we just need
special case custom lowering to handle the immediate 'mm512_shldi' form (like
we do for vector rotations).

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