| /* |
| * Copyright (c) 2019 ARM Limited. |
| * |
| * SPDX-License-Identifier: MIT |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to |
| * deal in the Software without restriction, including without limitation the |
| * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or |
| * sell copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in all |
| * copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| * SOFTWARE. |
| */ |
| #ifndef __ARM_COMPUTE_UTILS_HELPERS_FLOAT_OPS_H__ |
| #define __ARM_COMPUTE_UTILS_HELPERS_FLOAT_OPS_H__ |
| |
| namespace arm_compute |
| { |
| namespace helpers |
| { |
| namespace float_ops |
| { |
| union RawFloat |
| { |
| /** Constructor |
| * |
| * @param[in] val Floating-point value |
| */ |
| explicit RawFloat(float val) |
| : f32(val) |
| { |
| } |
| /** Extract sign of floating point number |
| * |
| * @return Sign of floating point number |
| */ |
| int32_t sign() const |
| { |
| return i32 >> 31; |
| } |
| /** Extract exponent of floating point number |
| * |
| * @return Exponent of floating point number |
| */ |
| int32_t exponent() const |
| { |
| return (i32 >> 23) & 0xFF; |
| } |
| /** Extract mantissa of floating point number |
| * |
| * @return Mantissa of floating point number |
| */ |
| int32_t mantissa() const |
| { |
| return i32 & 0x007FFFFF; |
| } |
| |
| int32_t i32; |
| float f32; |
| }; |
| |
| /** Checks if two floating point numbers are equal given an allowed number of ULPs |
| * |
| * @param[in] a First number to compare |
| * @param[in] b Second number to compare |
| * @param[in] max_allowed_ulps (Optional) Number of allowed ULPs |
| * |
| * @return True if number is close else false |
| */ |
| inline bool is_equal_ulps(float a, float b, int max_allowed_ulps = 0) |
| { |
| RawFloat ra(a); |
| RawFloat rb(b); |
| |
| // Check ULP distance |
| const int ulps = std::abs(ra.i32 - rb.i32); |
| return ulps <= max_allowed_ulps; |
| } |
| |
| /** Checks if the input floating point number is 1.0f checking if the difference is within a range defined with epsilon |
| * |
| * @param[in] a Input floating point number |
| * @param[in] epsilon (Optional) Epsilon used to define the error bounds |
| * |
| * @return True if number is close to 1.0f |
| */ |
| inline bool is_one(float a, float epsilon = 0.00001f) |
| { |
| return std::abs(1.0f - a) <= epsilon; |
| } |
| |
| /** Checks if the input floating point number is 0.0f checking if the difference is within a range defined with epsilon |
| * |
| * @param[in] a Input floating point number |
| * @param[in] epsilon (Optional) Epsilon used to define the error bounds |
| * |
| * @return True if number is close to 0.0f |
| */ |
| inline bool is_zero(float a, float epsilon = 0.00001f) |
| { |
| return std::abs(0.0f - a) <= epsilon; |
| } |
| } // namespace float_ops |
| } // namespace helpers |
| } // namespace arm_compute |
| #endif /* __ARM_COMPUTE_UTILS_HELPERS_FLOAT_OPS_H__ */ |