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// 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_
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