From: Chandler Carruth <chandlerc@gmail.com>
Date: Thu, 28 Aug 2014 03:52:45 +0000 (+0000)
Subject: [x86] Inline an SSE4 helper function for INSERT_VECTOR_ELT lowering, no
X-Git-Tag: android-x86-7.1-r4~58072
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=1201cc156f28c0f4f14cea94d2735632cbd3d6f4;p=android-x86%2Fexternal-llvm.git

[x86] Inline an SSE4 helper function for INSERT_VECTOR_ELT lowering, no
functionality changed.

Separating this into two functions wasn't helping. There was a decent
amount of boilerplate duplicated, and some subsequent refactorings here
will pull even more common code out.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216644 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 015d2c9ccc0..e6c00719680 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -10653,59 +10653,6 @@ X86TargetLowering::LowerEXTRACT_VECTOR_ELT(SDValue Op,
   return SDValue();
 }
 
-static SDValue LowerINSERT_VECTOR_ELT_SSE4(SDValue Op, SelectionDAG &DAG) {
-  MVT VT = Op.getSimpleValueType();
-  MVT EltVT = VT.getVectorElementType();
-  SDLoc dl(Op);
-
-  SDValue N0 = Op.getOperand(0);
-  SDValue N1 = Op.getOperand(1);
-  SDValue N2 = Op.getOperand(2);
-
-  if (!VT.is128BitVector())
-    return SDValue();
-
-  if ((EltVT.getSizeInBits() == 8 || EltVT.getSizeInBits() == 16) &&
-      isa<ConstantSDNode>(N2)) {
-    unsigned Opc;
-    if (VT == MVT::v8i16) {
-      Opc = X86ISD::PINSRW;
-    } else {
-      assert(VT == MVT::v16i8);
-      Opc = X86ISD::PINSRB;
-    }
-
-    // Transform it so it match pinsr{b,w} which expects a GR32 as its second
-    // argument.
-    if (N1.getValueType() != MVT::i32)
-      N1 = DAG.getNode(ISD::ANY_EXTEND, dl, MVT::i32, N1);
-    if (N2.getValueType() != MVT::i32)
-      N2 = DAG.getIntPtrConstant(cast<ConstantSDNode>(N2)->getZExtValue());
-    return DAG.getNode(Opc, dl, VT, N0, N1, N2);
-  }
-
-  if (EltVT == MVT::f32 && isa<ConstantSDNode>(N2)) {
-    // Bits [7:6] of the constant are the source select.  This will always be
-    //  zero here.  The DAG Combiner may combine an extract_elt index into these
-    //  bits.  For example (insert (extract, 3), 2) could be matched by putting
-    //  the '3' into bits [7:6] of X86ISD::INSERTPS.
-    // Bits [5:4] of the constant are the destination select.  This is the
-    //  value of the incoming immediate.
-    // Bits [3:0] of the constant are the zero mask.  The DAG Combiner may
-    //   combine either bitwise AND or insert of float 0.0 to set these bits.
-    N2 = DAG.getIntPtrConstant(cast<ConstantSDNode>(N2)->getZExtValue() << 4);
-    // Create this as a scalar to vector..
-    N1 = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v4f32, N1);
-    return DAG.getNode(X86ISD::INSERTPS, dl, VT, N0, N1, N2);
-  }
-
-  if ((EltVT == MVT::i32 || EltVT == MVT::i64) && isa<ConstantSDNode>(N2)) {
-    // PINSR* works with constant index.
-    return Op;
-  }
-  return SDValue();
-}
-
 /// Insert one bit to mask vector, like v16i1 or v8i1.
 /// AVX-512 feature.
 SDValue 
@@ -10744,7 +10691,7 @@ SDValue
 X86TargetLowering::LowerINSERT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) const {
   MVT VT = Op.getSimpleValueType();
   MVT EltVT = VT.getVectorElementType();
-  
+
   if (EltVT == MVT::i1)
     return InsertBitToMaskVector(Op, DAG);
 
@@ -10753,8 +10700,8 @@ X86TargetLowering::LowerINSERT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) const {
   SDValue N1 = Op.getOperand(1);
   SDValue N2 = Op.getOperand(2);
 
-  // If this is a 256-bit vector result, first extract the 128-bit vector,
-  // insert the element into the extracted half and then place it back.
+  // If the vector is wider than 128 bits, extract the 128-bit subvector, insert
+  // into that, and then insert the subvector back into the result.
   if (VT.is256BitVector() || VT.is512BitVector()) {
     if (!isa<ConstantSDNode>(N2))
       return SDValue();
@@ -10774,8 +10721,48 @@ X86TargetLowering::LowerINSERT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) const {
     return Insert128BitVector(N0, V, IdxVal, DAG, dl);
   }
 
-  if (Subtarget->hasSSE41())
-    return LowerINSERT_VECTOR_ELT_SSE4(Op, DAG);
+  if (Subtarget->hasSSE41()) {
+    if ((EltVT.getSizeInBits() == 8 || EltVT.getSizeInBits() == 16) &&
+        isa<ConstantSDNode>(N2)) {
+      unsigned Opc;
+      if (VT == MVT::v8i16) {
+        Opc = X86ISD::PINSRW;
+      } else {
+        assert(VT == MVT::v16i8);
+        Opc = X86ISD::PINSRB;
+      }
+
+      // Transform it so it match pinsr{b,w} which expects a GR32 as its second
+      // argument.
+      if (N1.getValueType() != MVT::i32)
+        N1 = DAG.getNode(ISD::ANY_EXTEND, dl, MVT::i32, N1);
+      if (N2.getValueType() != MVT::i32)
+        N2 = DAG.getIntPtrConstant(cast<ConstantSDNode>(N2)->getZExtValue());
+      return DAG.getNode(Opc, dl, VT, N0, N1, N2);
+    }
+
+    if (EltVT == MVT::f32 && isa<ConstantSDNode>(N2)) {
+      // Bits [7:6] of the constant are the source select.  This will always be
+      //  zero here.  The DAG Combiner may combine an extract_elt index into
+      //  these
+      //  bits.  For example (insert (extract, 3), 2) could be matched by
+      //  putting
+      //  the '3' into bits [7:6] of X86ISD::INSERTPS.
+      // Bits [5:4] of the constant are the destination select.  This is the
+      //  value of the incoming immediate.
+      // Bits [3:0] of the constant are the zero mask.  The DAG Combiner may
+      //   combine either bitwise AND or insert of float 0.0 to set these bits.
+      N2 = DAG.getIntPtrConstant(cast<ConstantSDNode>(N2)->getZExtValue() << 4);
+      // Create this as a scalar to vector..
+      N1 = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v4f32, N1);
+      return DAG.getNode(X86ISD::INSERTPS, dl, VT, N0, N1, N2);
+    }
+
+    if ((EltVT == MVT::i32 || EltVT == MVT::i64) && isa<ConstantSDNode>(N2)) {
+      // PINSR* works with constant index.
+      return Op;
+    }
+  }
 
   if (EltVT == MVT::i8)
     return SDValue();