[llvm] [RISCV] Support Strict FP arithmetic Op when only have Zvfhmin (PR #68867)

[Craig Topper via llvm-commits]

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@@ -634,6 +636,38 @@ void VectorLegalizer::PromoteSETCC(SDNode *Node,
   Results.push_back(Res);
 }
 
+void VectorLegalizer::PromoteSTRICT(SDNode *Node,
+                                    SmallVectorImpl<SDValue> &Results) {
+  MVT VecVT = Node->getOperand(1).getSimpleValueType();
+  MVT NewVecVT = TLI.getTypeToPromoteTo(Node->getOpcode(), VecVT);
+
+  assert(VecVT.isFloatingPoint());
+
+  SDLoc DL(Node);
+  SmallVector<SDValue, 5> Operands(Node->getNumOperands());
+
+  for (unsigned j = 0; j != Node->getNumOperands(); ++j)
+    if (Node->getOperand(j).getValueType().isVector() &&
+        !(ISD::isVPOpcode(Node->getOpcode()) &&
+          ISD::getVPMaskIdx(Node->getOpcode()) == j)) // Skip mask operand.
+      // promote the vector operand.
+      Operands[j] =
+          DAG.getNode(ISD::FP_EXTEND, DL, NewVecVT, Node->getOperand(j));
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topperc wrote:

Why aren't the inserted nodes also STRICT?

https://github.com/llvm/llvm-project/pull/68867