[llvm] [RISCV] Insert a freeze before converting select to AND/OR. (PR #84232)

[Nikita Popov via llvm-commits]

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@@ -7289,14 +7290,14 @@ static SDValue combineSelectToBinOp(SDNode *N, SelectionDAG &DAG,
     // (select x, x, y) -> x | y
     // (select !x, x, y) -> x & y
     if (std::optional<bool> MatchResult = matchSetCC(LHS, RHS, CC, TrueV)) {
-      return DAG.getNode(*MatchResult ? ISD::OR : ISD::AND, DL, VT, TrueV,
-                         FalseV);
+      return DAG.getNode(*MatchResult ? ISD::OR : ISD::AND, DL, VT,
+                         DAG.getFreeze(TrueV), DAG.getFreeze(FalseV));
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nikic wrote:

You do still need the freeze on y (FalseV), just not on x (TrueV).

https://github.com/llvm/llvm-project/pull/84232