1 files changed, 123 insertions, 0 deletions
diff --git a/deps/v8/src/codegen/arm64/utils-arm64.h b/deps/v8/src/codegen/arm64/utils-arm64.h
new file mode 100644
index 0000000000..6bddce6fff
--- /dev/null
+++ b/deps/v8/src/codegen/arm64/utils-arm64.h
@@ -0,0 +1,123 @@
+// 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_CODEGEN_ARM64_UTILS_ARM64_H_
+#define V8_CODEGEN_ARM64_UTILS_ARM64_H_
+
+#include <cmath>
+
+#include "src/codegen/arm64/constants-arm64.h"
+#include "src/utils/utils.h"
+
+namespace v8 {
+namespace internal {
+
+// These are global assumptions in v8.
+STATIC_ASSERT((static_cast<int32_t>(-1) >> 1) == -1);
+STATIC_ASSERT((static_cast<uint32_t>(-1) >> 1) == 0x7FFFFFFF);
+
+uint32_t float_sign(float val);
+uint32_t float_exp(float val);
+uint32_t float_mantissa(float val);
+uint32_t double_sign(double val);
+uint32_t double_exp(double val);
+uint64_t double_mantissa(double val);
+
+float float_pack(uint32_t sign, uint32_t exp, uint32_t mantissa);
+double double_pack(uint64_t sign, uint64_t exp, uint64_t mantissa);
+
+// An fpclassify() function for 16-bit half-precision floats.
+int float16classify(float16 value);
+
+// Bit counting.
+int CountLeadingZeros(uint64_t value, int width);
+int CountLeadingSignBits(int64_t value, int width);
+V8_EXPORT_PRIVATE int CountTrailingZeros(uint64_t value, int width);
+V8_EXPORT_PRIVATE int CountSetBits(uint64_t value, int width);
+int LowestSetBitPosition(uint64_t value);
+int HighestSetBitPosition(uint64_t value);
+uint64_t LargestPowerOf2Divisor(uint64_t value);
+int MaskToBit(uint64_t mask);
+
+template <typename T>
+T ReverseBytes(T value, int block_bytes_log2) {
+  DCHECK((sizeof(value) == 4) || (sizeof(value) == 8));
+  DCHECK((1ULL << block_bytes_log2) <= sizeof(value));
+  // Split the 64-bit value into an 8-bit array, where b[0] is the least
+  // significant byte, and b[7] is the most significant.
+  uint8_t bytes[8];
+  uint64_t mask = 0xff00000000000000;
+  for (int i = 7; i >= 0; i--) {
+    bytes[i] = (static_cast<uint64_t>(value) & mask) >> (i * 8);
+    mask >>= 8;
+  }
+
+  // Permutation tables for REV instructions.
+  //  permute_table[0] is used by REV16_x, REV16_w
+  //  permute_table[1] is used by REV32_x, REV_w
+  //  permute_table[2] is used by REV_x
+  DCHECK((0 < block_bytes_log2) && (block_bytes_log2 < 4));
+  static const uint8_t permute_table[3][8] = {{6, 7, 4, 5, 2, 3, 0, 1},
+                                              {4, 5, 6, 7, 0, 1, 2, 3},
+                                              {0, 1, 2, 3, 4, 5, 6, 7}};
+  T result = 0;
+  for (int i = 0; i < 8; i++) {
+    result <<= 8;
+    result |= bytes[permute_table[block_bytes_log2 - 1][i]];
+  }
+  return result;
+}
+
+// NaN tests.
+inline bool IsSignallingNaN(double num) {
+  uint64_t raw = bit_cast<uint64_t>(num);
+  if (std::isnan(num) && ((raw & kDQuietNanMask) == 0)) {
+    return true;
+  }
+  return false;
+}
+
+inline bool IsSignallingNaN(float num) {
+  uint32_t raw = bit_cast<uint32_t>(num);
+  if (std::isnan(num) && ((raw & kSQuietNanMask) == 0)) {
+    return true;
+  }
+  return false;
+}
+
+inline bool IsSignallingNaN(float16 num) {
+  const uint16_t kFP16QuietNaNMask = 0x0200;
+  return (float16classify(num) == FP_NAN) && ((num & kFP16QuietNaNMask) == 0);
+}
+
+template <typename T>
+inline bool IsQuietNaN(T num) {
+  return std::isnan(num) && !IsSignallingNaN(num);
+}
+
+// Convert the NaN in 'num' to a quiet NaN.
+inline double ToQuietNaN(double num) {
+  DCHECK(std::isnan(num));
+  return bit_cast<double>(bit_cast<uint64_t>(num) | kDQuietNanMask);
+}
+
+inline float ToQuietNaN(float num) {
+  DCHECK(std::isnan(num));
+  return bit_cast<float>(bit_cast<uint32_t>(num) |
+                         static_cast<uint32_t>(kSQuietNanMask));
+}
+
+// Fused multiply-add.
+inline double FusedMultiplyAdd(double op1, double op2, double a) {
+  return fma(op1, op2, a);
+}
+
+inline float FusedMultiplyAdd(float op1, float op2, float a) {
+  return fmaf(op1, op2, a);
+}
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_CODEGEN_ARM64_UTILS_ARM64_H_