[llvm-bugs] [Bug 40111] New: [DAGCombine] Move X86 saturated math combines to DAGCombine

via llvm-bugs llvm-bugs at lists.llvm.org
Thu Dec 20 04:04:44 PST 2018


            Bug ID: 40111
           Summary: [DAGCombine] Move X86 saturated math combines to
           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: craig.topper at gmail.com, llvm-bugs at lists.llvm.org,
                    nikita.ppv at gmail.com, spatel+llvm at rotateright.com

Now that the X86 backend uses the generic saturated math opcodes (ISD::UADDSAT
etc.) we should be able to move most/all of those combines out of
X86ISelLowering and into DAGCombiner directly.

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