[turbofan] Introduce optional Float64Min and Float64Max machine operators.

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"
 
@@ skipping 56 matching lines @@
 
 // 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 ZoneObject {
  public:
   // Flags that specify which operations are available. This is useful
   // for operations that are unsupported by some back-ends.
   enum Flag {
     kNoFlags = 0u,
-    kFloat64RoundDown = 1u << 0,
-    kFloat64RoundTruncate = 1u << 1,
-    kFloat64RoundTiesAway = 1u << 2,
-    kInt32DivIsSafe = 1u << 3,
-    kUint32DivIsSafe = 1u << 4,
-    kWord32ShiftIsSafe = 1u << 5
+    kFloat64Max = 1u << 0,
+    kFloat64Min = 1u << 1,
+    kFloat64RoundDown = 1u << 2,
+    kFloat64RoundTruncate = 1u << 3,
+    kFloat64RoundTiesAway = 1u << 4,
+    kInt32DivIsSafe = 1u << 5,
+    kUint32DivIsSafe = 1u << 6,
+    kWord32ShiftIsSafe = 1u << 7
   };
   typedef base::Flags<Flag, unsigned> Flags;
 
   explicit MachineOperatorBuilder(Zone* zone, MachineType word = kMachPtr,
                                   Flags supportedOperators = kNoFlags);
 
   const Operator* Word32And();
   const Operator* Word32Or();
   const Operator* Word32Xor();
   const Operator* Word32Shl();
@@ skipping 66 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 min/max complying to IEEE 754.
+  const Operator* Float64Max();
+  const Operator* Float64Min();
+  bool HasFloat64Max() { return flags_ & kFloat64Max; }
+  bool HasFloat64Min() { return flags_ & kFloat64Min; }
+
   // Floating point rounding.
   const Operator* Float64RoundDown();
   const Operator* Float64RoundTruncate();
   const Operator* Float64RoundTiesAway();
   bool HasFloat64RoundDown() { return flags_ & kFloat64RoundDown; }
   bool HasFloat64RoundTruncate() { return flags_ & kFloat64RoundTruncate; }
   bool HasFloat64RoundTiesAway() { return flags_ & kFloat64RoundTiesAway; }
 
   // Floating point bit representation.
   const Operator* Float64ExtractLowWord32();
@@ skipping 59 matching lines @@
 };
 
 
 DEFINE_OPERATORS_FOR_FLAGS(MachineOperatorBuilder::Flags)
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_MACHINE_OPERATOR_H_