Merge experimental/a64 to bleeding_edge.

src/a64/utils-a64.h

+// Copyright 2013 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef V8_A64_UTILS_A64_H_
+#define V8_A64_UTILS_A64_H_
+
+#include <cmath>
+#include "v8.h"
+#include "a64/constants-a64.h"
+
+#define REGISTER_CODE_LIST(R)                                                  \
+R(0)  R(1)  R(2)  R(3)  R(4)  R(5)  R(6)  R(7)                                 \
+R(8)  R(9)  R(10) R(11) R(12) R(13) R(14) R(15)                                \
+R(16) R(17) R(18) R(19) R(20) R(21) R(22) R(23)                                \
+R(24) R(25) R(26) R(27) R(28) R(29) R(30) R(31)
+
+namespace v8 {
+namespace internal {
+
+// Floating point representation.
+static inline uint32_t float_to_rawbits(float value) {
+  uint32_t bits = 0;
+  memcpy(&bits, &value, 4);
+  return bits;
+}
+
+
+static inline uint64_t double_to_rawbits(double value) {
+  uint64_t bits = 0;
+  memcpy(&bits, &value, 8);
+  return bits;
+}
+
+
+static inline float rawbits_to_float(uint32_t bits) {
+  float value = 0.0;
+  memcpy(&value, &bits, 4);
+  return value;
+}
+
+
+static inline double rawbits_to_double(uint64_t bits) {
+  double value = 0.0;
+  memcpy(&value, &bits, 8);
+  return value;
+}
+
+
+// Bits counting.
+int CountLeadingZeros(uint64_t value, int width);
+int CountLeadingSignBits(int64_t value, int width);
+int CountTrailingZeros(uint64_t value, int width);
+int CountSetBits(uint64_t value, int width);
+int MaskToBit(uint64_t mask);
+
+
+// NaN tests.
+inline bool IsSignallingNaN(double num) {
+  const uint64_t kFP64QuietNaNMask = 0x0008000000000000UL;
+  uint64_t raw = double_to_rawbits(num);
+  if (std::isnan(num) && ((raw & kFP64QuietNaNMask) == 0)) {
+    return true;
+  }
+  return false;
+}
+
+
+inline bool IsSignallingNaN(float num) {
+  const uint64_t kFP32QuietNaNMask = 0x00400000UL;
+  uint32_t raw = float_to_rawbits(num);
+  if (std::isnan(num) && ((raw & kFP32QuietNaNMask) == 0)) {
+    return true;
+  }
+  return false;
+}
+
+
+template <typename T>
+inline bool IsQuietNaN(T num) {
+  return std::isnan(num) && !IsSignallingNaN(num);
+}
+
+} }  // namespace v8::internal
+
+#endif  // V8_A64_UTILS_A64_H_