[turbofan] Add Float32(Max|Min) machine operators.

src/utils.h

 // Copyright 2012 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_UTILS_H_
 #define V8_UTILS_H_
 
 #include <limits.h>
 #include <stdlib.h>
 #include <string.h>
@@ skipping 182 matching lines @@
   return a < b ? b : a;
 }
 
 
 // Returns the minimum of the two parameters.
 template <typename T>
 T Min(T a, T b) {
   return a < b ? a : b;
 }
 
+// Returns the maximum of the two parameters according to JavaScript semantics.
+template <typename T>
+T JSMax(T x, T y) {
+  if (std::isnan(x)) return x;
+  if (std::isnan(y)) return y;
+  if (std::signbit(x) < std::signbit(y)) return x;
+  return x > y ? x : y;
+}
+
+// Returns the maximum of the two parameters according to JavaScript semantics.
+template <typename T>
+T JSMin(T x, T y) {
+  if (std::isnan(x)) return x;
+  if (std::isnan(y)) return y;
+  if (std::signbit(x) < std::signbit(y)) return y;
+  return x > y ? y : x;
+}
 
 // Returns the absolute value of its argument.
 template <typename T>
 T Abs(T a) {
   return a < 0 ? -a : a;
 }
 
 
 // Floor(-0.0) == 0.0
 inline double Floor(double x) {
@@ skipping 1357 matching lines @@
   byte* dst = reinterpret_cast<byte*>(p);
   for (size_t i = 0; i < sizeof(V); i++) {
     dst[i] = src[sizeof(V) - i - 1];
   }
 #endif  // V8_TARGET_LITTLE_ENDIAN
 }
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_UTILS_H_