Add Float64Round operator.

src/compiler/machine-operator.h

 // Copyright 2013 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_MACHINE_OPERATOR_H_
 #define V8_COMPILER_MACHINE_OPERATOR_H_
 
+#include "src/base/flags.h"
 #include "src/compiler/machine-type.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 // Forward declarations.
 struct MachineOperatorBuilderImpl;
 class Operator;
 
@@ skipping 26 matching lines @@
 
 bool operator==(StoreRepresentation, StoreRepresentation);
 bool operator!=(StoreRepresentation, StoreRepresentation);
 
 size_t hash_value(StoreRepresentation);
 
 std::ostream& operator<<(std::ostream&, StoreRepresentation);
 
 StoreRepresentation const& StoreRepresentationOf(Operator const*);
 
+enum SupportedOperator {

[Benedikt Meurer, 2014/10/23 07:11:14]

I'd not name it SupportedOperator, but rather move it to
MachineOperatorBuilder::Flags, because it's not only about the availability of
operators but also about their behavior.

[sigurds, 2014/10/23 10:37:56]

Done.

+  kNoSupportedOperators = 0,
+  kSupportsFloat64Floor = 1 << 0,
+  kSupportsFloat64Ceil = 1 << 1,
+  kSupportsFloat64RoundTiesAway = 1 << 2,
+  kSupportsFloat64RoundTiesTowards = 1 << 3
+};
+
+typedef base::Flags<SupportedOperator, uint8_t> SupportedOperators;
+DEFINE_OPERATORS_FOR_FLAGS(SupportedOperators)
 
 // Interface for building machine-level operators. These operators are
 // machine-level but machine-independent and thus define a language suitable
 // for generating code to run on architectures such as ia32, x64, arm, etc.
 class MachineOperatorBuilder FINAL {
  public:
-  explicit MachineOperatorBuilder(MachineType word = kMachPtr);
+  explicit MachineOperatorBuilder(
+      MachineType word = kMachPtr,
+      SupportedOperators supportedOperators = kNoSupportedOperators);
 
   const Operator* Word32And();
   const Operator* Word32Or();
   const Operator* Word32Xor();
   const Operator* Word32Shl();
   const Operator* Word32Shr();
   const Operator* Word32Sar();
   const Operator* Word32Ror();
   const Operator* Word32Equal();
 
@@ skipping 57 matching lines @@
   const Operator* Float64Mul();
   const Operator* Float64Div();
   const Operator* Float64Mod();
   const Operator* Float64Sqrt();
 
   // Floating point comparisons complying to IEEE 754.
   const Operator* Float64Equal();
   const Operator* Float64LessThan();
   const Operator* Float64LessThanOrEqual();
 
+  // Floating point rounding.
+  const Operator* Float64Floor();
+  const Operator* Float64Ceil();
+  const Operator* Float64RoundAwayFromZero();
+  const Operator* Float64RoundToZero();
+  bool HasFloat64Floor() { return supportedOperators_ & kSupportsFloat64Floor; }
+  bool HasFloat64Ceil() { return supportedOperators_ & kSupportsFloat64Ceil; }
+  bool HasFloat64RoundAwayFromZero() {
+    return supportedOperators_ & kSupportsFloat64RoundTiesAway;
+  }
+  bool HasFloat64RoundToZero() {
+    return supportedOperators_ & kSupportsFloat64RoundTiesTowards;
+  }
+
   // load [base + index]
   const Operator* Load(LoadRepresentation rep);
 
   // store [base + index], value
   const Operator* Store(StoreRepresentation rep);
 
   // Access to the machine stack.
   const Operator* LoadStackPointer();
 
   // Target machine word-size assumed by this builder.
@@ skipping 26 matching lines @@
   const Operator* Prefix##Suffix() {                             \
     return Is32() ? Prefix##32##Suffix() : Prefix##64##Suffix(); \
   }
   PSEUDO_OP_LIST(PSEUDO_OP)
 #undef PSEUDO_OP
 #undef PSEUDO_OP_LIST
 
  private:
   const MachineOperatorBuilderImpl& impl_;
   const MachineType word_;
+  const SupportedOperators supportedOperators_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_MACHINE_OPERATOR_H_