| // 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_ARM64_UTILS_ARM64_H_ |
| #define V8_ARM64_UTILS_ARM64_H_ |
| |
| #include <cmath> |
| #include "src/v8.h" |
| #include "src/arm64/constants-arm64.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 { |
| |
| // These are global assumptions in v8. |
| STATIC_ASSERT((static_cast<int32_t>(-1) >> 1) == -1); |
| STATIC_ASSERT((static_cast<uint32_t>(-1) >> 1) == 0x7FFFFFFF); |
| |
| // 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; |
| } |
| |
| |
| // Bit 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) { |
| uint64_t raw = double_to_rawbits(num); |
| if (std::isnan(num) && ((raw & kDQuietNanMask) == 0)) { |
| return true; |
| } |
| return false; |
| } |
| |
| |
| inline bool IsSignallingNaN(float num) { |
| uint32_t raw = float_to_rawbits(num); |
| if (std::isnan(num) && ((raw & kSQuietNanMask) == 0)) { |
| return true; |
| } |
| return false; |
| } |
| |
| |
| 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) { |
| ASSERT(isnan(num)); |
| return rawbits_to_double(double_to_rawbits(num) | kDQuietNanMask); |
| } |
| |
| |
| inline float ToQuietNaN(float num) { |
| ASSERT(isnan(num)); |
| return rawbits_to_float(float_to_rawbits(num) | 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 v8::internal |
| |
| #endif // V8_ARM64_UTILS_ARM64_H_ |