[AMDGPU][SDAG] Add ISD::PTRADD DAG combines#142739

Merged

ritter-x2a merged 7 commits intomainfrom

users/ritter-x2a/06-04-_amdgpu_sdag_add_isd_ptradd_dag_combines

Jun 26, 2025

Commits on Jun 26, 2025

[AMDGPU][SDAG] Add ISD::PTRADD DAG combines
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Remove undef/poison operand handling from the PTRADD dag combine
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Bail out early in the generic combine to reduce identation, add a comment referring to the target-specific reassociation there, and remove a currently unused variable in the target-specific combine.
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Add an explicit PtrVT == IntVT to the (ptradd 0, x) -> x fold
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Add a test for poison/undef folds.
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Implement reviewer suggestions
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Update new AArch64/cpa-selectiondag.ll test
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