Add codegen support for NEON vst4 intrinsics with 128-bit vectors.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83486 91177308-0d34-0410-b5e6-96231b3b80d8

4 files changed, 135 insertions, 9 deletions

diff --git a/lib/Target/ARM/ARMISelDAGToDAG.cpp b/lib/Target/ARM/ARMISelDAGToDAG.cpp
index 02a499af4e..713cc2e73f 100644
--- a/lib/Target/ARM/ARMISelDAGToDAG.cpp
+++ b/lib/Target/ARM/ARMISelDAGToDAG.cpp
@@ -1668,18 +1668,70 @@ SDNode *ARMDAGToDAGISel::Select(SDValue Op) {
       SDValue MemAddr, MemUpdate, MemOpc;
       if (!SelectAddrMode6(Op, N->getOperand(2), MemAddr, MemUpdate, MemOpc))
         return NULL;
-      switch (N->getOperand(3).getValueType().getSimpleVT().SimpleTy) {
+      VT = N->getOperand(3).getValueType();
+      if (VT.is64BitVector()) {
+        switch (VT.getSimpleVT().SimpleTy) {
+        default: llvm_unreachable("unhandled vst4 type");
+        case MVT::v8i8:  Opc = ARM::VST4d8; break;
+        case MVT::v4i16: Opc = ARM::VST4d16; break;
+        case MVT::v2f32:
+        case MVT::v2i32: Opc = ARM::VST4d32; break;
+        }
+        SDValue Chain = N->getOperand(0);
+        const SDValue Ops[] = { MemAddr, MemUpdate, MemOpc,
+                                N->getOperand(3), N->getOperand(4),
+                                N->getOperand(5), N->getOperand(6), Chain };
+        return CurDAG->getMachineNode(Opc, dl, MVT::Other, Ops, 8);
+      }
+      // Quad registers are stored with two separate instructions, where one
+      // stores the even registers and the other stores the odd registers.
+      EVT RegVT;
+      unsigned Opc2 = 0;
+      switch (VT.getSimpleVT().SimpleTy) {
       default: llvm_unreachable("unhandled vst4 type");
-      case MVT::v8i8:  Opc = ARM::VST4d8; break;
-      case MVT::v4i16: Opc = ARM::VST4d16; break;
-      case MVT::v2f32:
-      case MVT::v2i32: Opc = ARM::VST4d32; break;
+      case MVT::v16i8:
+        Opc = ARM::VST4q8a;  Opc2 = ARM::VST4q8b;  RegVT = MVT::v8i8; break;
+      case MVT::v8i16:
+        Opc = ARM::VST4q16a; Opc2 = ARM::VST4q16b; RegVT = MVT::v4i16; break;
+      case MVT::v4f32:
+        Opc = ARM::VST4q32a; Opc2 = ARM::VST4q32b; RegVT = MVT::v2f32; break;
+      case MVT::v4i32:
+        Opc = ARM::VST4q32a; Opc2 = ARM::VST4q32b; RegVT = MVT::v2i32; break;
       }
       SDValue Chain = N->getOperand(0);
-      const SDValue Ops[] = { MemAddr, MemUpdate, MemOpc,
-                              N->getOperand(3), N->getOperand(4),
-                              N->getOperand(5), N->getOperand(6), Chain };
-      return CurDAG->getMachineNode(Opc, dl, MVT::Other, Ops, 8);
+      // Enable writeback to the address register.
+      MemOpc = CurDAG->getTargetConstant(ARM_AM::getAM6Opc(true), MVT::i32);
+
+      SDValue D0 = CurDAG->getTargetExtractSubreg(ARM::DSUBREG_0, dl, RegVT,
+                                                  N->getOperand(3));
+      SDValue D2 = CurDAG->getTargetExtractSubreg(ARM::DSUBREG_0, dl, RegVT,
+                                                  N->getOperand(4));
+      SDValue D4 = CurDAG->getTargetExtractSubreg(ARM::DSUBREG_0, dl, RegVT,
+                                                  N->getOperand(5));
+      SDValue D6 = CurDAG->getTargetExtractSubreg(ARM::DSUBREG_0, dl, RegVT,
+                                                  N->getOperand(6));
+      const SDValue OpsA[] = { MemAddr, MemUpdate, MemOpc,
+                               D0, D2, D4, D6, Chain };
+      SDNode *VStA = CurDAG->getMachineNode(Opc, dl, MemAddr.getValueType(),
+                                            MVT::Other, OpsA, 8);
+      Chain = SDValue(VStA, 1);
+
+      SDValue D1 = CurDAG->getTargetExtractSubreg(ARM::DSUBREG_1, dl, RegVT,
+                                                  N->getOperand(3));
+      SDValue D3 = CurDAG->getTargetExtractSubreg(ARM::DSUBREG_1, dl, RegVT,
+                                                  N->getOperand(4));
+      SDValue D5 = CurDAG->getTargetExtractSubreg(ARM::DSUBREG_1, dl, RegVT,
+                                                  N->getOperand(5));
+      SDValue D7 = CurDAG->getTargetExtractSubreg(ARM::DSUBREG_1, dl, RegVT,
+                                                  N->getOperand(6));
+      MemAddr = SDValue(VStA, 0);
+      const SDValue OpsB[] = { MemAddr, MemUpdate, MemOpc,
+                               D1, D3, D5, D7, Chain };
+      SDNode *VStB = CurDAG->getMachineNode(Opc2, dl, MemAddr.getValueType(),
+                                            MVT::Other, OpsB, 8);
+      Chain = SDValue(VStB, 1);
+      ReplaceUses(SDValue(N, 0), Chain);
+      return NULL;
     }
 
     case Intrinsic::arm_neon_vst2lane: {
diff --git a/lib/Target/ARM/ARMInstrNEON.td b/lib/Target/ARM/ARMInstrNEON.td
index 405a441aa9..73691324cc 100644
--- a/lib/Target/ARM/ARMInstrNEON.td
+++ b/lib/Target/ARM/ARMInstrNEON.td
@@ -361,11 +361,26 @@ class VST4D<string OpcodeStr>
                    DPR:$src1, DPR:$src2, DPR:$src3, DPR:$src4), IIC_VST,
           !strconcat(OpcodeStr, "\t\\{$src1,$src2,$src3,$src4\\}, $addr"),
           "", []>;
+class VST4WB<string OpcodeStr>
+  : NLdSt<(outs GPR:$wb), (ins addrmode6:$addr, DPR:$src1, DPR:$src2,
+                           DPR:$src3, DPR:$src4), IIC_VST,
+          !strconcat(OpcodeStr, "\t\\{$src1,$src2,$src3,$src4\\}, $addr"),
+          "$addr.addr = $wb", []>;
 
 def  VST4d8   : VST4D<"vst4.8">;
 def  VST4d16  : VST4D<"vst4.16">;
 def  VST4d32  : VST4D<"vst4.32">;
 
+// vst4 to double-spaced even registers.
+def  VST4q8a  : VST4WB<"vst4.8">;
+def  VST4q16a : VST4WB<"vst4.16">;
+def  VST4q32a : VST4WB<"vst4.32">;
+
+// vst4 to double-spaced odd registers.
+def  VST4q8b  : VST4WB<"vst4.8">;
+def  VST4q16b : VST4WB<"vst4.16">;
+def  VST4q32b : VST4WB<"vst4.32">;
+
 //   VST2LN   : Vector Store (single 2-element structure from one lane)
 class VST2LND<string OpcodeStr>
   : NLdSt<(outs), (ins addrmode6:$addr, DPR:$src1, DPR:$src2, nohash_imm:$lane),
diff --git a/lib/Target/ARM/NEONPreAllocPass.cpp b/lib/Target/ARM/NEONPreAllocPass.cpp
index d0a3fbfce7..0c167a12c5 100644
--- a/lib/Target/ARM/NEONPreAllocPass.cpp
+++ b/lib/Target/ARM/NEONPreAllocPass.cpp
@@ -174,6 +174,24 @@ static bool isNEONMultiRegOp(int Opcode, unsigned &FirstOpnd, unsigned &NumRegs,
     NumRegs = 4;
     return true;
 
+  case ARM::VST4q8a:
+  case ARM::VST4q16a:
+  case ARM::VST4q32a:
+    FirstOpnd = 4;
+    NumRegs = 4;
+    Offset = 0;
+    Stride = 2;
+    return true;
+
+  case ARM::VST4q8b:
+  case ARM::VST4q16b:
+  case ARM::VST4q32b:
+    FirstOpnd = 4;
+    NumRegs = 4;
+    Offset = 1;
+    Stride = 2;
+    return true;
+
   case ARM::VTBL2:
     FirstOpnd = 1;
     NumRegs = 2;
diff --git a/test/CodeGen/ARM/vst4.ll b/test/CodeGen/ARM/vst4.ll
index 8966b62202..c7d4da0aee 100644
--- a/test/CodeGen/ARM/vst4.ll
+++ b/test/CodeGen/ARM/vst4.ll
@@ -32,7 +32,48 @@ define void @vst4f(float* %A, <2 x float>* %B) nounwind {
 	ret void
 }
 
+define void @vst4Qi8(i8* %A, <16 x i8>* %B) nounwind {
+;CHECK: vst4Qi8:
+;CHECK: vst4.8
+;CHECK: vst4.8
+	%tmp1 = load <16 x i8>* %B
+	call void @llvm.arm.neon.vst4.v16i8(i8* %A, <16 x i8> %tmp1, <16 x i8> %tmp1, <16 x i8> %tmp1, <16 x i8> %tmp1)
+	ret void
+}
+
+define void @vst4Qi16(i16* %A, <8 x i16>* %B) nounwind {
+;CHECK: vst4Qi16:
+;CHECK: vst4.16
+;CHECK: vst4.16
+	%tmp1 = load <8 x i16>* %B
+	call void @llvm.arm.neon.vst4.v8i16(i16* %A, <8 x i16> %tmp1, <8 x i16> %tmp1, <8 x i16> %tmp1, <8 x i16> %tmp1)
+	ret void
+}
+
+define void @vst4Qi32(i32* %A, <4 x i32>* %B) nounwind {
+;CHECK: vst4Qi32:
+;CHECK: vst4.32
+;CHECK: vst4.32
+	%tmp1 = load <4 x i32>* %B
+	call void @llvm.arm.neon.vst4.v4i32(i32* %A, <4 x i32> %tmp1, <4 x i32> %tmp1, <4 x i32> %tmp1, <4 x i32> %tmp1)
+	ret void
+}
+
+define void @vst4Qf(float* %A, <4 x float>* %B) nounwind {
+;CHECK: vst4Qf:
+;CHECK: vst4.32
+;CHECK: vst4.32
+	%tmp1 = load <4 x float>* %B
+	call void @llvm.arm.neon.vst4.v4f32(float* %A, <4 x float> %tmp1, <4 x float> %tmp1, <4 x float> %tmp1, <4 x float> %tmp1)
+	ret void
+}
+
 declare void @llvm.arm.neon.vst4.v8i8(i8*, <8 x i8>, <8 x i8>, <8 x i8>, <8 x i8>) nounwind
 declare void @llvm.arm.neon.vst4.v4i16(i8*, <4 x i16>, <4 x i16>, <4 x i16>, <4 x i16>) nounwind
 declare void @llvm.arm.neon.vst4.v2i32(i8*, <2 x i32>, <2 x i32>, <2 x i32>, <2 x i32>) nounwind
 declare void @llvm.arm.neon.vst4.v2f32(i8*, <2 x float>, <2 x float>, <2 x float>, <2 x float>) nounwind
+
+declare void @llvm.arm.neon.vst4.v16i8(i8*, <16 x i8>, <16 x i8>, <16 x i8>, <16 x i8>) nounwind
+declare void @llvm.arm.neon.vst4.v8i16(i8*, <8 x i16>, <8 x i16>, <8 x i16>, <8 x i16>) nounwind
+declare void @llvm.arm.neon.vst4.v4i32(i8*, <4 x i32>, <4 x i32>, <4 x i32>, <4 x i32>) nounwind
+declare void @llvm.arm.neon.vst4.v4f32(i8*, <4 x float>, <4 x float>, <4 x float>, <4 x float>) nounwind