MIPS: [wasm] Lowering of Int64Shl, Int64Shr, Int64Sar, Int64Add and Int64Sub.

src/compiler/mips/instruction-selector-mips.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/base/adapters.h"
 #include "src/base/bits.h"
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
 
@@ skipping 377 matching lines @@
     }
   }
   VisitRRO(this, kMipsShr, node);
 }
 
 
 void InstructionSelector::VisitWord32Sar(Node* node) {
   VisitRRO(this, kMipsSar, node);
 }
 
-void InstructionSelector::VisitInt32PairAdd(Node* node) { UNIMPLEMENTED(); }
+void InstructionSelector::VisitInt32PairAdd(Node* node) {
+  MipsOperandGenerator g(this);
 
-void InstructionSelector::VisitInt32PairSub(Node* node) { UNIMPLEMENTED(); }
+  // We use UseUniqueRegister here to avoid register sharing with the output
+  // register.
+  InstructionOperand inputs[] = {g.UseUniqueRegister(node->InputAt(0)),
+                                 g.UseUniqueRegister(node->InputAt(1)),
+                                 g.UseUniqueRegister(node->InputAt(2)),
+                                 g.UseUniqueRegister(node->InputAt(3))};
+  InstructionOperand outputs[] = {
+      g.DefineAsRegister(node),
+      g.DefineAsRegister(NodeProperties::FindProjection(node, 1))};
+  Emit(kMipsAddPair, 2, outputs, 4, inputs);
+}
+
+void InstructionSelector::VisitInt32PairSub(Node* node) {
+  MipsOperandGenerator g(this);
+
+  // We use UseUniqueRegister here to avoid register sharing with the output
+  // register.
+  InstructionOperand inputs[] = {g.UseUniqueRegister(node->InputAt(0)),
+                                 g.UseUniqueRegister(node->InputAt(1)),
+                                 g.UseUniqueRegister(node->InputAt(2)),
+                                 g.UseUniqueRegister(node->InputAt(3))};
+  InstructionOperand outputs[] = {
+      g.DefineAsRegister(node),
+      g.DefineAsRegister(NodeProperties::FindProjection(node, 1))};
+  Emit(kMipsSubPair, 2, outputs, 4, inputs);
+}

[balazs.kilvady, 2016/04/05 11:13:16]

I like the VisitWord32PairShift() refactoring below. Could you do something
similar for PairAdd and PairSub? Like using a VisitWord32<GoodName>Pair() helper
for the common bodies, where GoodName is up to you :) Maybe Op?

[Marija Antic, 2016/04/05 12:28:34]

Done.

 
 void InstructionSelector::VisitInt32PairMul(Node* node) { UNIMPLEMENTED(); }
 
-void InstructionSelector::VisitWord32PairShl(Node* node) { UNIMPLEMENTED(); }
+// Shared routine for multiple shift operations.
+static void VisitWord32PairShift(InstructionSelector* selector,
+                                 InstructionCode opcode, Node* node) {
+  MipsOperandGenerator g(selector);
+  Int32Matcher m(node->InputAt(2));
+  InstructionOperand shift_operand;
+  if (m.HasValue()) {
+    shift_operand = g.UseImmediate(m.node());
+  } else {
+    shift_operand = g.UseUniqueRegister(m.node());
+  }
 
-void InstructionSelector::VisitWord32PairShr(Node* node) { UNIMPLEMENTED(); }
+  // We use UseUniqueRegister here to avoid register sharing with the output
+  // register.
+  InstructionOperand inputs[] = {g.UseUniqueRegister(node->InputAt(0)),
+                                 g.UseUniqueRegister(node->InputAt(1)),
+                                 shift_operand};
 
-void InstructionSelector::VisitWord32PairSar(Node* node) { UNIMPLEMENTED(); }
+  InstructionOperand outputs[] = {
+      g.DefineAsRegister(node),
+      g.DefineAsRegister(NodeProperties::FindProjection(node, 1))};
+
+  selector->Emit(opcode, 2, outputs, 3, inputs);
+}
+
+void InstructionSelector::VisitWord32PairShl(Node* node) {
+  VisitWord32PairShift(this, kMipsShlPair, node);
+}
+
+void InstructionSelector::VisitWord32PairShr(Node* node) {
+  VisitWord32PairShift(this, kMipsShrPair, node);
+}
+
+void InstructionSelector::VisitWord32PairSar(Node* node) {
+  VisitWord32PairShift(this, kMipsSarPair, node);
+}
 
 void InstructionSelector::VisitWord32Ror(Node* node) {
   VisitRRO(this, kMipsRor, node);
 }
 
 
 void InstructionSelector::VisitWord32Clz(Node* node) {
   VisitRR(this, kMipsClz, node);
 }
 
@@ skipping 560 matching lines @@
                                                 : g.UseRegister(length)
                                           : g.UseRegister(length);
 
   Emit(opcode | AddressingModeField::encode(kMode_MRI), g.NoOutput(),
        offset_operand, length_operand, g.UseRegister(value),
        g.UseRegister(buffer));
 }
 
 
 namespace {
-
 // Shared routine for multiple compare operations.
 static void VisitCompare(InstructionSelector* selector, InstructionCode opcode,
                          InstructionOperand left, InstructionOperand right,
                          FlagsContinuation* cont) {
   MipsOperandGenerator g(selector);
   opcode = cont->Encode(opcode);
   if (cont->IsBranch()) {
     selector->Emit(opcode, g.NoOutput(), left, right,
                    g.Label(cont->true_block()), g.Label(cont->false_block()));
   } else if (cont->IsDeoptimize()) {
@@ skipping 398 matching lines @@
          MachineOperatorBuilder::kFloat32Max |
          MachineOperatorBuilder::kFloat32RoundDown |
          MachineOperatorBuilder::kFloat32RoundUp |
          MachineOperatorBuilder::kFloat32RoundTruncate |
          MachineOperatorBuilder::kFloat32RoundTiesEven;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8