MIPS: Enable Math rounding operations call reduction optimization in TF.

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/bits.h"
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 51 matching lines @@
 
 static void VisitRRR(InstructionSelector* selector, ArchOpcode opcode,
                      Node* node) {
   MipsOperandGenerator g(selector);
   selector->Emit(opcode, g.DefineAsRegister(node),
                  g.UseRegister(node->InputAt(0)),
                  g.UseRegister(node->InputAt(1)));
 }
 
 
+static void VisitRR(InstructionSelector* selector, ArchOpcode opcode,
+                    Node* node) {
+  MipsOperandGenerator g(selector);
+  selector->Emit(opcode, g.DefineAsRegister(node),
+                 g.UseRegister(node->InputAt(0)));
+}
+
+
 static void VisitRRO(InstructionSelector* selector, ArchOpcode opcode,
                      Node* node) {
   MipsOperandGenerator g(selector);
   selector->Emit(opcode, g.DefineAsRegister(node),
                  g.UseRegister(node->InputAt(0)),
                  g.UseOperand(node->InputAt(1), opcode));
 }
 
 
 static void VisitBinop(InstructionSelector* selector, Node* node,
@@ skipping 331 matching lines @@
        g.UseFixed(node->InputAt(1), f14))->MarkAsCall();
 }
 
 
 void InstructionSelector::VisitFloat64Sqrt(Node* node) {
   MipsOperandGenerator g(this);
   Emit(kMipsSqrtD, g.DefineAsRegister(node), g.UseRegister(node->InputAt(0)));
 }
 
 
-void InstructionSelector::VisitFloat64Floor(Node* node) { UNREACHABLE(); }
+void InstructionSelector::VisitFloat64Floor(Node* node) {
+  VisitRR(this, kMipsFloat64Floor, node);
+}
 
 
-void InstructionSelector::VisitFloat64Ceil(Node* node) { UNREACHABLE(); }
+void InstructionSelector::VisitFloat64Ceil(Node* node) {
+  VisitRR(this, kMipsFloat64Ceil, node);
+}
 
 
 void InstructionSelector::VisitFloat64RoundTruncate(Node* node) {
-  UNREACHABLE();
+  VisitRR(this, kMipsFloat64RoundTruncate, node);
 }
 
 
 void InstructionSelector::VisitFloat64RoundTiesAway(Node* node) {
   UNREACHABLE();
 }
 
 
 void InstructionSelector::VisitCall(Node* node) {
   MipsOperandGenerator g(this);
@@ skipping 358 matching lines @@
 
 void InstructionSelector::VisitFloat64LessThanOrEqual(Node* node) {
   FlagsContinuation cont(kUnorderedLessThanOrEqual, node);
   VisitFloat64Compare(this, node, &cont);
 }
 
 
 // static
 MachineOperatorBuilder::Flags
 InstructionSelector::SupportedMachineOperatorFlags() {
+  if (IsMipsArchVariant(kMips32r2) || IsMipsArchVariant(kMips32r6)) {
+    return MachineOperatorBuilder::kFloat64Floor |
+           MachineOperatorBuilder::kFloat64Ceil |
+           MachineOperatorBuilder::kFloat64RoundTruncate;
+  }
   return MachineOperatorBuilder::kNoFlags;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8