[llvm-bugs] [Bug 42863] New: [DAGCombine] Convert isNegatibleForFree/GetNegatedExpression to a target hook

via llvm-bugs llvm-bugs at lists.llvm.org
Thu Aug 1 08:43:13 PDT 2019


            Bug ID: 42863
           Summary: [DAGCombine] Convert
                    isNegatibleForFree/GetNegatedExpression to a target
           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, Matthew.Arsenault at amd.com,
                    spatel+llvm at rotateright.com

I'm hoping to get https://reviews.llvm.org/D63141 completed soon, after which
we should investigate refactoring isNegatibleForFree/GetNegatedExpression so
they can be used with target nodes as well.

This would encompass most of X86ISelLowering's combineFneg,
AMDGPUTargetLowering::performFNegCombine and probably others as well.

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