| Issue |
183351
|
| Summary |
[DAG] isKnownNeverZero - add ISD::VECTOR_SHUFFLE handling
|
| Labels |
good first issue,
llvm:SelectionDAG
|
| Assignees |
|
| Reporter |
RKSimon
|
Similar to computeKnownBits implementation - use getShuffleDemandedElts to get the LHS/RHS operand demanded elts and check that they are both either undemanded or passes a isKnownNeverZero test.
Demanded elements with undef shuffle mask elements should always return false.
These should be done with regular lit tests if at all possible instead of unit tests.
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