[llvm] [DAG] canCreateUndefOrPoison - remove isGuaranteedNotToBeUndefOrPoison check for insert/extract vector element indices (PR #146514)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-selectiondag

Author: Simon Pilgrim (RKSimon)

<details>
<summary>Changes</summary>

No longer necessary now that #<!-- -->146490 has landed

---
Full diff: https://github.com/llvm/llvm-project/pull/146514.diff


1 Files Affected:

- (modified) llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp (+2-6) 


``````````diff
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index a1e4d706ef6b2..569b816756891 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -5636,12 +5636,8 @@ bool SelectionDAG::canCreateUndefOrPoison(SDValue Op, const APInt &DemandedElts,
     // Ensure that the element index is in bounds.
     EVT VecVT = Op.getOperand(0).getValueType();
     SDValue Idx = Op.getOperand(Opcode == ISD::INSERT_VECTOR_ELT ? 2 : 1);
-    if (isGuaranteedNotToBeUndefOrPoison(Idx, DemandedElts, PoisonOnly,
-                                         Depth + 1)) {
-      KnownBits KnownIdx = computeKnownBits(Idx, Depth + 1);
-      return KnownIdx.getMaxValue().uge(VecVT.getVectorMinNumElements());
-    }
-    return true;
+    KnownBits KnownIdx = computeKnownBits(Idx, Depth + 1);
+    return KnownIdx.getMaxValue().uge(VecVT.getVectorMinNumElements());
   }
 
   case ISD::VECTOR_SHUFFLE: {

``````````

</details>


https://github.com/llvm/llvm-project/pull/146514