Compute Library
 21.02
Rounding.cpp
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1 /*
2  * Copyright (c) 2017-2019 Arm Limited.
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4  * SPDX-License-Identifier: MIT
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24 
26 
27 #include "arm_compute/core/Error.h"
29 
30 #include <cmath>
31 
32 using namespace arm_compute;
33 using namespace std;
34 
35 int arm_compute::round(float x, RoundingPolicy rounding_policy)
36 {
37  using namespace std;
38  int rounded = 0;
39  switch(rounding_policy)
40  {
42  {
43  rounded = static_cast<int>(x);
44  break;
45  }
47  {
48  rounded = static_cast<int>(support::cpp11::round(x));
49  break;
50  }
52  {
53 #ifdef __aarch64__
54  asm("fcvtns %x[res], %s[value]"
55  : [res] "=r"(rounded)
56  : [value] "w"(x));
57 #else // __aarch64__
58  ARM_COMPUTE_ERROR("TO_NEAREST_EVEN rounding policy is not supported.");
59 #endif // __aarch64__
60  break;
61  }
62  default:
63  {
64  ARM_COMPUTE_ERROR("Unsupported rounding policy.");
65  break;
66  }
67  }
68 
69  return rounded;
70 }
Rounds to nearest value; half rounds away from zero.
#define ARM_COMPUTE_ERROR(msg)
Print the given message then throw an std::runtime_error.
Definition: Error.h:352
Copyright (c) 2017-2021 Arm Limited.
RoundingPolicy
Rounding method.
Definition: Rounding.h:30
int round(float x, RoundingPolicy rounding_policy)
Return a rounded value of x.
Definition: Rounding.cpp:35
Rounds to nearest value; half rounds to nearest even.
T round(T value)
Round floating-point value with half value rounding away from zero.
Truncates the least significant values that are lost in operations.