[arm] Fix recognition of VNEG.

src/compiler/node-matchers.h

 // 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.
 
 #ifndef V8_COMPILER_NODE_MATCHERS_H_
 #define V8_COMPILER_NODE_MATCHERS_H_
 
 #include "src/compiler/generic-node.h"
 #include "src/compiler/generic-node-inl.h"
 #include "src/compiler/node.h"
@@ skipping 86 matching lines @@
 typedef Int64Matcher IntPtrMatcher;
 typedef Uint64Matcher UintPtrMatcher;
 #endif
 
 
 // A pattern matcher for floating point constants.
 template <typename T, IrOpcode::Value kOpcode>
 struct FloatMatcher FINAL : public ValueMatcher<T, kOpcode> {
   explicit FloatMatcher(Node* node) : ValueMatcher<T, kOpcode>(node) {}
 
+  bool IsMinusZero() const {
+    return this->Is(0.0) && std::signbit(this->Value());

[Sven Panne, 2014/11/26 09:48:33]

std::signbit is a C++11 library feature, plain signbit is not.

[Benedikt Meurer, 2014/11/26 10:47:19]

Done.

+  }
   bool IsNaN() const { return this->HasValue() && std::isnan(this->Value()); }
 };
 
 typedef FloatMatcher<float, IrOpcode::kFloat32Constant> Float32Matcher;
 typedef FloatMatcher<double, IrOpcode::kFloat64Constant> Float64Matcher;
 typedef FloatMatcher<double, IrOpcode::kNumberConstant> NumberMatcher;
 
 
 // A pattern matcher for heap object constants.
 template <typename T>
@@ skipping 43 matching lines @@
 
 typedef BinopMatcher<Int32Matcher, Int32Matcher> Int32BinopMatcher;
 typedef BinopMatcher<Uint32Matcher, Uint32Matcher> Uint32BinopMatcher;
 typedef BinopMatcher<Int64Matcher, Int64Matcher> Int64BinopMatcher;
 typedef BinopMatcher<Uint64Matcher, Uint64Matcher> Uint64BinopMatcher;
 typedef BinopMatcher<IntPtrMatcher, IntPtrMatcher> IntPtrBinopMatcher;
 typedef BinopMatcher<UintPtrMatcher, UintPtrMatcher> UintPtrBinopMatcher;
 typedef BinopMatcher<Float64Matcher, Float64Matcher> Float64BinopMatcher;
 typedef BinopMatcher<NumberMatcher, NumberMatcher> NumberBinopMatcher;
 
+
 template <class BinopMatcher, IrOpcode::Value kAddOpcode,
           IrOpcode::Value kMulOpcode, IrOpcode::Value kShiftOpcode>
 struct AddMatcher : public BinopMatcher {
   static const IrOpcode::Value kOpcode = kAddOpcode;
 
   explicit AddMatcher(Node* node) : BinopMatcher(node), scale_exponent_(-1) {
     if (this->HasProperty(Operator::kCommutative)) PutScaledInputOnLeft();
   }
 
   bool HasScaledInput() const { return scale_exponent_ != -1; }
@@ skipping 203 matching lines @@
 };
 
 typedef ScaledWithOffsetMatcher<Int32AddMatcher> ScaledWithOffset32Matcher;
 typedef ScaledWithOffsetMatcher<Int64AddMatcher> ScaledWithOffset64Matcher;
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_NODE_MATCHERS_H_