[turbofan] Change Float64Max/Float64Min to JavaScript semantics.

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/machine-type.h"
 
@@ skipping 75 matching lines @@
 
 MachineRepresentation AtomicStoreRepresentationOf(Operator const* op);
 
 // 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 {
+  enum Flag : unsigned {
     kNoFlags = 0u,
-    // Note that Float*Max behaves like `(b < a) ? a : b`, not like Math.max().
-    // Note that Float*Min behaves like `(a < b) ? a : b`, not like Math.min().
-    kFloat32Max = 1u << 0,
-    kFloat32Min = 1u << 1,
-    kFloat64Max = 1u << 2,
-    kFloat64Min = 1u << 3,
-    kFloat32RoundDown = 1u << 4,
-    kFloat64RoundDown = 1u << 5,
-    kFloat32RoundUp = 1u << 6,
-    kFloat64RoundUp = 1u << 7,
-    kFloat32RoundTruncate = 1u << 8,
-    kFloat64RoundTruncate = 1u << 9,
-    kFloat32RoundTiesEven = 1u << 10,
-    kFloat64RoundTiesEven = 1u << 11,
-    kFloat64RoundTiesAway = 1u << 12,
-    kInt32DivIsSafe = 1u << 13,
-    kUint32DivIsSafe = 1u << 14,
-    kWord32ShiftIsSafe = 1u << 15,
-    kWord32Ctz = 1u << 16,
-    kWord64Ctz = 1u << 17,
-    kWord32Popcnt = 1u << 18,
-    kWord64Popcnt = 1u << 19,
-    kWord32ReverseBits = 1u << 20,
-    kWord64ReverseBits = 1u << 21,
-    kFloat32Neg = 1u << 22,
-    kFloat64Neg = 1u << 23,
+    kFloat32RoundDown = 1u << 0,
+    kFloat64RoundDown = 1u << 1,
+    kFloat32RoundUp = 1u << 2,
+    kFloat64RoundUp = 1u << 3,
+    kFloat32RoundTruncate = 1u << 4,
+    kFloat64RoundTruncate = 1u << 5,
+    kFloat32RoundTiesEven = 1u << 6,
+    kFloat64RoundTiesEven = 1u << 7,
+    kFloat64RoundTiesAway = 1u << 8,
+    kInt32DivIsSafe = 1u << 9,
+    kUint32DivIsSafe = 1u << 10,
+    kWord32ShiftIsSafe = 1u << 11,
+    kWord32Ctz = 1u << 12,
+    kWord64Ctz = 1u << 13,
+    kWord32Popcnt = 1u << 14,
+    kWord64Popcnt = 1u << 15,
+    kWord32ReverseBits = 1u << 16,
+    kWord64ReverseBits = 1u << 17,
+    kFloat32Neg = 1u << 18,
+    kFloat64Neg = 1u << 19,
     kAllOptionalOps =
-        kFloat32Max | kFloat32Min | kFloat64Max | kFloat64Min |
         kFloat32RoundDown | kFloat64RoundDown | kFloat32RoundUp |
         kFloat64RoundUp | kFloat32RoundTruncate | kFloat64RoundTruncate |
         kFloat64RoundTiesAway | kFloat32RoundTiesEven | kFloat64RoundTiesEven |
         kWord32Ctz | kWord64Ctz | kWord32Popcnt | kWord64Popcnt |
         kWord32ReverseBits | kWord64ReverseBits | kFloat32Neg | kFloat64Neg
   };
   typedef base::Flags<Flag, unsigned> Flags;
 
   class AlignmentRequirements {
    public:
@@ skipping 201 matching lines @@
   // Floating point comparisons complying to IEEE 754 (single-precision).
   const Operator* Float32Equal();
   const Operator* Float32LessThan();
   const Operator* Float32LessThanOrEqual();
 
   // Floating point comparisons complying to IEEE 754 (double-precision).
   const Operator* Float64Equal();
   const Operator* Float64LessThan();
   const Operator* Float64LessThanOrEqual();
 
-  // Floating point min/max complying to IEEE 754 (single-precision).
-  const OptionalOperator Float32Max();
-  const OptionalOperator Float32Min();
-
-  // Floating point min/max complying to IEEE 754 (double-precision).
-  const OptionalOperator Float64Max();
-  const OptionalOperator Float64Min();
+  // Floating point min/max complying to EcmaScript 6 (double-precision).
+  const Operator* Float64Max();
+  const Operator* Float64Min();
 
   // Floating point abs complying to IEEE 754 (single-precision).
   const Operator* Float32Abs();
 
   // Floating point abs complying to IEEE 754 (double-precision).
   const Operator* Float64Abs();
 
   // Floating point rounding.
   const OptionalOperator Float32RoundDown();
   const OptionalOperator Float64RoundDown();
@@ skipping 313 matching lines @@
 };
 
 
 DEFINE_OPERATORS_FOR_FLAGS(MachineOperatorBuilder::Flags)
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_MACHINE_OPERATOR_H_