[llvm-bugs] [Bug 40081] New: [DAGCombiner] Extend DAGCombiner::MatchRotate to handle funnel shifts

via llvm-bugs llvm-bugs at lists.llvm.org
Tue Dec 18 06:11:36 PST 2018


            Bug ID: 40081
           Summary: [DAGCombiner] Extend DAGCombiner::MatchRotate to
                    handle funnel shifts
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Common Code Generator Code
          Assignee: unassignedbugs at nondot.org
          Reporter: llvm-dev at redking.me.uk
                CC: llvm-bugs at lists.llvm.org, spatel+llvm at rotateright.com

Now that the ISD::FSHL/FSHR opcodes are available we should be able to refactor
the existing rotation pattern matching logic to handle funnel shifts as well.

This should also allow us to remove the X86ISelLowering's X86ISD::SHLD/SHRD
matching code in combineOr.

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