[llvm] [PowePC] using MTVSRBMI instruction instead of constant pool in power10+ (PR #144084)

[Lei Huang via llvm-commits]

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@@ -9591,6 +9622,24 @@ SDValue PPCTargetLowering::LowerBUILD_VECTOR(SDValue Op,
   BuildVectorSDNode *BVN = dyn_cast<BuildVectorSDNode>(Op.getNode());
   assert(BVN && "Expected a BuildVectorSDNode in LowerBUILD_VECTOR");
 
+  if(Subtarget.hasP10Vector()) {
+    APInt BMI(32, 0);
+    // If the value of the vector is all zeros or all ones,
+    // we do not convert it to MTVSRBMI.
+    // The xxleqv instruction sets a vector with all ones.
+    // The xxlxor instruction sets a vector with all zeros.
+    if (isValidMtVsrbmi(BMI, *BVN) && BMI != 0 && BMI!=0xffff ) {
+      SDValue  SDConstant= DAG.getTargetConstant(BMI, dl, MVT::i32);
+      MachineSDNode* MSDNode = DAG.getMachineNode(PPC::MTVSRBMI, dl,MVT::v16i8, SDConstant);
+      SDValue  SDV = SDValue(MSDNode,0);
+      EVT DVT = BVN->getValueType(0);
+      EVT SVT = SDV.getValueType();
+      if (SVT != DVT ) {
+	SDV = DAG.getNode(ISD::BITCAST, dl, DVT, SDV);
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lei137 wrote:

clang format

https://github.com/llvm/llvm-project/pull/144084