[llvm] [X86][AVX10.2] Map vector saturated converts to public intrinsics (PR #121483)

[Phoebe Wang via llvm-commits]

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@@ -56202,6 +56235,32 @@ static SDValue combineSIntToFP(SDNode *N, SelectionDAG &DAG,
   return SDValue();
 }
 
+// Custom handling for VCVTTPS2QQS/VCVTTPS2UQQS
+static SDValue combineFP_TO_xINT_SAT(SDNode *N, SelectionDAG &DAG,
+                                     const X86Subtarget &Subtarget) {
+  if (!Subtarget.hasAVX10_2())
+    return SDValue();
+
+  bool IsSigned = N->getOpcode() == ISD::FP_TO_SINT_SAT;
+  EVT SrcVT = N->getOperand(0).getValueType();
+  EVT DstVT = N->getValueType(0);
+  SDLoc dl(N);
+
+  if (SrcVT == MVT::v2f32 && DstVT == MVT::v2i64) {
+    // Convert v2f32 to v2f64
+    SDValue V2F64 =
+        DAG.getNode(ISD::FP_EXTEND, dl, MVT::v2f64, N->getOperand(0));
+
+    // Select the FP_TO_SINT_SAT_CUSTOM/FP_TO_UINT_SAT_CUSTOM node
+    if (IsSigned)
+      return DAG.getNode(X86ISD::FP_TO_SINT_SAT_CUSTOM, dl, MVT::v2i64, V2F64);
+    else
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phoebewang wrote:

No else after return.

https://github.com/llvm/llvm-project/pull/121483