[llvm] DAG: Fix losing flags on select when expanding select_cc (PR #93662)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-selectiondag

Author: Matt Arsenault (arsenm)

<details>
<summary>Changes</summary>

This was only preserving the flags on the setcc, not the new select. This was missing presumably due to getSelect not having a flags argument until recently. Avoids regressions in a future commit.

---
Full diff: https://github.com/llvm/llvm-project/pull/93662.diff


1 Files Affected:

- (modified) llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp (+2-1) 


``````````diff
diff --git a/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index bfc2273c9425c..51f2cf9017f85 100644
--- a/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -4159,7 +4159,8 @@ bool SelectionDAGLegalize::ExpandNode(SDNode *Node) {
              "expanded.");
       EVT CCVT = getSetCCResultType(CmpVT);
       SDValue Cond = DAG.getNode(ISD::SETCC, dl, CCVT, Tmp1, Tmp2, CC, Node->getFlags());
-      Results.push_back(DAG.getSelect(dl, VT, Cond, Tmp3, Tmp4));
+      Results.push_back(
+          DAG.getSelect(dl, VT, Cond, Tmp3, Tmp4, Node->getFlags()));
       break;
     }
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/93662