[llvm-branch-commits] [llvm] DAG: Preserve more flags when expanding gep (PR #110815)

[via llvm-branch-commits]

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@@ -4386,34 +4386,54 @@ void SelectionDAGBuilder::visitGetElementPtr(const User &I) {
       // it.
       IdxN = DAG.getSExtOrTrunc(IdxN, dl, N.getValueType());
 
+      SDNodeFlags ScaleFlags;
+      // The multiplication of an index by the type size does not wrap the
+      // pointer index type in a signed sense (mul nsw).
+      if (NW.hasNoUnsignedSignedWrap())
+        ScaleFlags.setNoSignedWrap(true);
+
+      // The multiplication of an index by the type size does not wrap the
+      // pointer index type in an unsigned sense (mul nuw).
+      if (NW.hasNoUnsignedWrap())
+        ScaleFlags.setNoUnsignedWrap(true);
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goldsteinn wrote:

`ScaleFlags.setNoUnsignedWrap(NW.hasNoUnsignedWrap())`;

Likewise above.

https://github.com/llvm/llvm-project/pull/110815