[DAG] WidenVectorOperand - add basic handling for *_EXTEND_VECTOR_INREG nodes

Fixes Issue llvm#70208

Author: RKSimon

llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.h

@@ -1000,6 +1000,7 @@ class LLVM_LIBRARY_VISIBILITY DAGTypeLegalizer {
   SDValue WidenVecOp_EXTRACT_VECTOR_ELT(SDNode *N);
   SDValue WidenVecOp_INSERT_SUBVECTOR(SDNode *N);
   SDValue WidenVecOp_EXTRACT_SUBVECTOR(SDNode *N);
+  SDValue WidenVecOp_EXTEND_VECTOR_INREG(SDNode *N);
   SDValue WidenVecOp_STORE(SDNode* N);
   SDValue WidenVecOp_VP_STORE(SDNode *N, unsigned OpNo);
   SDValue WidenVecOp_VP_STRIDED_STORE(SDNode *N, unsigned OpNo);

llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp

@@ -5959,6 +5959,11 @@ bool DAGTypeLegalizer::WidenVectorOperand(SDNode *N, unsigned OpNo) {
   case ISD::EXPERIMENTAL_VP_STRIDED_STORE:
     Res = WidenVecOp_VP_STRIDED_STORE(N, OpNo);
     break;
+  case ISD::ANY_EXTEND_VECTOR_INREG:
+  case ISD::SIGN_EXTEND_VECTOR_INREG:
+  case ISD::ZERO_EXTEND_VECTOR_INREG:
+    Res = WidenVecOp_EXTEND_VECTOR_INREG(N);
+    break;
   case ISD::MSTORE:             Res = WidenVecOp_MSTORE(N, OpNo); break;
   case ISD::MGATHER:            Res = WidenVecOp_MGATHER(N, OpNo); break;
   case ISD::MSCATTER:           Res = WidenVecOp_MSCATTER(N, OpNo); break;
@@ -6377,6 +6382,11 @@ SDValue DAGTypeLegalizer::WidenVecOp_EXTRACT_VECTOR_ELT(SDNode *N) {
                      N->getValueType(0), InOp, N->getOperand(1));
 }
 
+SDValue DAGTypeLegalizer::WidenVecOp_EXTEND_VECTOR_INREG(SDNode *N) {
+  SDValue InOp = GetWidenedVector(N->getOperand(0));
+  return DAG.getNode(N->getOpcode(), SDLoc(N), N->getValueType(0), InOp);
+}
+
 SDValue DAGTypeLegalizer::WidenVecOp_STORE(SDNode *N) {
   // We have to widen the value, but we want only to store the original
   // vector type.

llvm/test/CodeGen/PowerPC/pr70208.ll

@@ -0,0 +1,25 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 3
+; RUN: llc -verify-machineinstrs -mtriple=ppc64le-unknown-linux-gnu < %s | FileCheck %s
+
+define <4 x i64> @widget(<8 x i16> %call) {
+; CHECK-LABEL: widget:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    addis 3, 2, .LCPI0_0@toc@ha
+; CHECK-NEXT:    xxlxor 32, 32, 32
+; CHECK-NEXT:    addi 3, 3, .LCPI0_0@toc@l
+; CHECK-NEXT:    lxvd2x 0, 0, 3
+; CHECK-NEXT:    addis 3, 2, .LCPI0_1@toc@ha
+; CHECK-NEXT:    addi 3, 3, .LCPI0_1@toc@l
+; CHECK-NEXT:    xxswapd 35, 0
+; CHECK-NEXT:    lxvd2x 0, 0, 3
+; CHECK-NEXT:    vperm 4, 0, 2, 3
+; CHECK-NEXT:    xxswapd 37, 0
+; CHECK-NEXT:    vperm 3, 0, 2, 5
+; CHECK-NEXT:    vmr 2, 4
+; CHECK-NEXT:    blr
+  %bitcast = bitcast <8 x i16> %call to <16 x i8>
+  %shufflevector = shufflevector <16 x i8> <i8 poison, i8 poison, i8 0, i8 0, i8 poison, i8 poison, i8 0, i8 0, i8 poison, i8 poison, i8 0, i8 0, i8 poison, i8 poison, i8 0, i8 0>, <16 x i8> %bitcast, <16 x i32> <i32 16, i32 17, i32 2, i32 3, i32 18, i32 19, i32 6, i32 7, i32 20, i32 21, i32 10, i32 11, i32 22, i32 23, i32 14, i32 15>
+  %bitcast1 = bitcast <16 x i8> %shufflevector to <4 x i32>
+  %zext = zext <4 x i32> %bitcast1 to <4 x i64>
+  ret <4 x i64> %zext
+}