| Issue |
174327
|
| Summary |
[DAG] SDPatternMatch - add m_Negative/m_StrictlyPositive/m_NonNegative/m_NonPositive matchers
|
| Labels |
good first issue,
llvm:SelectionDAG
|
| Assignees |
|
| Reporter |
RKSimon
|
Similar to the IR PatternMatch matchers, we should add m_Negative/m_StrictlyPositive/m_NonNegative/m_NonPositive matchers, but these should support non-constant values - not just APInt like PatternMatch.
This would be the first time we've attempted to include value tracking inside SDPatternMatch - sd_match can optionally take a SelectionDAG pointer for BasicMatchContext but its barely used and there might be a few other gotchas that need fixing.
Unit test coverage inside SelectionDAGPatternMatchTest.cpp is a must, and ideally you should find a fold in DAGCombiner/TargetLowering that would benefit from being converted to use a matcher.
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