https://bugs.llvm.org/show_bug.cgi?id=39689
Bug ID: 39689
Summary: TargetLowering::SimplifyDemandedBits - improve vector
support
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Common Code Generator Code
Assignee: unassignedb...@nondot.org
Reporter: llvm-...@redking.me.uk
CC: llvm-bugs@lists.llvm.org, spatel+l...@rotateright.com
Blocks: 39549
We need to improve vector type support in SimplifyDemandedBits:
ISD::TRUNCATE (DAGCombiner.visitTRUNCATE currently disables this)
ISD::EXTRACT_VECTOR_ELT
ISD::INSERT_VECTOR_ELT
ISD::SCALAR_TO_VECTOR
ISD::VECTOR_SHUFFLE
Referenced Bugs:
https://bugs.llvm.org/show_bug.cgi?id=39549
[Bug 39549] [X86] SimplifyDemandedBits fails to remove a zero vector input from
unpckh
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