diff options
Diffstat (limited to 'src/core/utils/Math.h')
-rw-r--r-- | src/core/utils/Math.h | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/src/core/utils/Math.h b/src/core/utils/Math.h new file mode 100644 index 0000000000..f006948f69 --- /dev/null +++ b/src/core/utils/Math.h @@ -0,0 +1,49 @@ +/* + * Copyright (c) 2023 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 ACL_SRC_CORE_UTILS_MATH_H +#define ACL_SRC_CORE_UTILS_MATH_H + +#include <array> + +namespace arm_compute +{ + +/** Lookup table for erf(x) calculation. */ +template <typename T> +struct ErfLutEntry +{ + /** erf(x) */ + T value; + + /** 2 / sqrt(pi) * e^(-x^2) */ + T scale; +}; + +/** The lookup table for FP32 erf(x) calculation. */ +extern const std::array<ErfLutEntry<float>, 513> erf_f32_lut; + +} // namespace arm_compute + +#endif // ACL_SRC_CORE_UTILS_MATH_H |