[llvm] [DAG][X86] Improve custom i256/i512 AVX512 CTLZ/CTTZ Handling with MVT::i256/i512 (PR #168860)

[Simon Pilgrim via llvm-commits]

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@@ -5520,7 +5520,8 @@ static SDValue combineSTORE(SDNode *N, TargetLowering::DAGCombinerInfo &DCI,
     // Unfortunately, we can't do this in the legalizer because there is no
     // way to setOperationAction for an non-simple type.
     StoreSDNode *ST = cast<StoreSDNode>(N);
-    if (!ST->getValue().getValueType().isSimple())
+    if (!ST->getValue().getValueType().isSimple() ||
+        ST->getValue().getScalarValueSizeInBits() >= 256)
       return lowerSTOREVector(SDValue(ST, 0), DCI.DAG, STI);
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RKSimon wrote:

Thanks - updated

https://github.com/llvm/llvm-project/pull/168860