[X86][AVX512] Lower broadcast sub vector to vector inrtrinsics

lower broadcast<type>x<vector> to shuffles.
 there are two cases:
1.src is 128 bits and dest is 512 bits: in this case we will lower it to shuffle with imm = 0.
2.src is 256 bit and dest is 512 bits: in this case we will lower it to shuffle with imm = 01000100b (0x44) that way we will broadcast the 256bit source: ymm[0,1,2,3] => zmm[0,1,2,3,0,1,2,3] then it will mask it with the passthru value (in case it's mask op).



Differential Revision: http://reviews.llvm.org/D15790

llvm-svn: 256490

1 files changed, 17 insertions, 0 deletions

diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index f8a390cf8f7..182a8cd3e8a 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -16889,6 +16889,23 @@ static SDValue LowerINTRINSIC_WO_CHAIN(SDValue Op, const X86Subtarget *Subtarget
       SDValue VMask = getMaskNode(Mask, MaskVT, Subtarget, DAG, dl);
       return DAG.getNode(IntrData->Opc0, dl, VT, VMask);
     }
+    case BRCST_SUBVEC_TO_VEC: {
+      SDValue Src = Op.getOperand(1);
+      SDValue Passthru = Op.getOperand(2);
+      SDValue Mask = Op.getOperand(3);
+      EVT resVT = Passthru.getValueType();
+      SDValue subVec = DAG.getNode(ISD::INSERT_SUBVECTOR, dl, resVT,
+                                       DAG.getUNDEF(resVT), Src,
+                                       DAG.getIntPtrConstant(0, dl));
+      SDValue immVal;
+      if (Src.getSimpleValueType().is256BitVector() && resVT.is512BitVector())
+        immVal = DAG.getConstant(0x44, dl, MVT::i8);
+      else
+        immVal = DAG.getConstant(0, dl, MVT::i8);
+      return getVectorMaskingNode(DAG.getNode(IntrData->Opc0, dl, VT,
+                                              subVec, subVec, immVal),
+                                  Mask, Passthru, Subtarget, DAG);
+    }
     default:
       break;
     }