[llvm-bugs] [Bug 40000] New: [DAGCombine] Add DemandedElts to SimplifyDemandedBits
via llvm-bugs
llvm-bugs at lists.llvm.org
Thu Dec 13 06:42:18 PST 2018
https://bugs.llvm.org/show_bug.cgi?id=40000
Bug ID: 40000
Summary: [DAGCombine] Add DemandedElts to SimplifyDemandedBits
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: andrea.dibiagio at gmail.com, llvm-bugs at lists.llvm.org,
spatel+llvm at rotateright.com
We currently have 2 simplification combine helpers:
SimplifyDemandedBits - demand specific bits from every vector element (or
scalar)
SimplifyDemandedVectorElts - demand specific vector elements
This would be be a lot more powerful if we could merge these, adding a
DemandedElts argument to SimplifyDemandedBits and moving the
SimplifyDemandedVectorElts functionality into it as well.
This would also match what we've already done to computeKnownBits and
ComputeNumSignBits, allowing all of these functions to work together properly.
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