[llvm] [LoongArch] Enable more vector tests for 32-bit target (PR #160656)

[via llvm-commits]

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@@ -3102,12 +3111,33 @@ LoongArchTargetLowering::lowerINSERT_VECTOR_ELT(SDValue Op,
     return SDValue();
 
   SDValue SplatElt = DAG.getSplatBuildVector(VT, DL, Op1);
-  SDValue SplatIdx = DAG.getSplatBuildVector(IdxVTy, DL, Op2);
-
   SmallVector<SDValue, 32> RawIndices;
-  for (unsigned i = 0; i < NumElts; ++i)
-    RawIndices.push_back(DAG.getConstant(i, DL, Subtarget.getGRLenVT()));
-  SDValue Indices = DAG.getBuildVector(IdxVTy, DL, RawIndices);
+  SDValue SplatIdx;
+  SDValue Indices;
+
+  if (!Subtarget.is64Bit() && IdxTy == MVT::i64) {
+    MVT PairVTy = MVT::getVectorVT(MVT::i32, NumElts * 2);
+    for (unsigned i = 0; i < NumElts; ++i) {
+      RawIndices.push_back(Op2);
+      RawIndices.push_back(DAG.getConstant(0, DL, Subtarget.getGRLenVT()));
+    }
+    SplatIdx = DAG.getBuildVector(PairVTy, DL, RawIndices);
+    SplatIdx = DAG.getBitcast(IdxVTy, SplatIdx);
+
+    RawIndices.clear();
+    for (unsigned i = 0; i < NumElts; ++i) {
+      RawIndices.push_back(DAG.getConstant(i, DL, Subtarget.getGRLenVT()));
+      RawIndices.push_back(DAG.getConstant(0, DL, Subtarget.getGRLenVT()));
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heiher wrote:

Thanks! All done.

https://github.com/llvm/llvm-project/pull/160656