[llvm] [SDAG] Remove useless check (PR #181538)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-selectiondag

Author: None (natanelh-mobileye)

<details>
<summary>Changes</summary>

At this point in the code we already know that it is legal to make that abd node.

---
Full diff: https://github.com/llvm/llvm-project/pull/181538.diff


1 Files Affected:

- (modified) llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp (+2-4) 


``````````diff
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 65675036d1305..73bac443b07ff 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -12594,8 +12594,7 @@ SDValue DAGCombiner::foldSelectToABD(SDValue LHS, SDValue RHS, SDValue True,
     if (sd_match(True, m_AnyOf(m_Sub(m_Specific(RHS), m_Specific(LHS)),
                                m_Add(m_Specific(RHS), m_SpecificNeg(LHS)))) &&
         sd_match(False, m_AnyOf(m_Sub(m_Specific(LHS), m_Specific(RHS)),
-                                m_Add(m_Specific(LHS), m_SpecificNeg(RHS)))) &&
-        hasOperation(ABDOpc, VT))
+                                m_Add(m_Specific(LHS), m_SpecificNeg(RHS)))))
       return DAG.getNegative(DAG.getNode(ABDOpc, DL, VT, LHS, RHS), DL, VT);
     break;
   case ISD::SETLT:
@@ -12610,8 +12609,7 @@ SDValue DAGCombiner::foldSelectToABD(SDValue LHS, SDValue RHS, SDValue True,
     if (sd_match(True, m_AnyOf(m_Sub(m_Specific(LHS), m_Specific(RHS)),
                                m_Add(m_Specific(LHS), m_SpecificNeg(RHS)))) &&
         sd_match(False, m_AnyOf(m_Sub(m_Specific(RHS), m_Specific(LHS)),
-                                m_Add(m_Specific(RHS), m_SpecificNeg(LHS)))) &&
-        hasOperation(ABDOpc, VT))
+                                m_Add(m_Specific(RHS), m_SpecificNeg(LHS)))))
       return DAG.getNegative(DAG.getNode(ABDOpc, DL, VT, LHS, RHS), DL, VT);
     break;
   default:

``````````

</details>


https://github.com/llvm/llvm-project/pull/181538