54 lines
2.1 KiB
C
Executable file
54 lines
2.1 KiB
C
Executable file
/* Audio Library for Teensy 3.X
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* Copyright (c) 2014, Paul Stoffregen, paul@pjrc.com
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*
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* Development of this audio library was funded by PJRC.COM, LLC by sales of
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* Teensy and Audio Adaptor boards. Please support PJRC's efforts to develop
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* open source software by purchasing Teensy or other PJRC products.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice, development funding notice, and this permission
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* notice shall be included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" const uint16_t sqrt_integer_guess_table[];
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#else
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extern const uint16_t sqrt_integer_guess_table[];
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#endif
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inline uint32_t sqrt_uint32(uint32_t in) __attribute__((always_inline,unused));
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inline uint32_t sqrt_uint32(uint32_t in)
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{
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uint32_t n = sqrt_integer_guess_table[__builtin_clz(in)];
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n = ((in / n) + n) / 2;
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n = ((in / n) + n) / 2;
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n = ((in / n) + n) / 2;
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return n;
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}
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inline uint32_t sqrt_uint32_approx(uint32_t in) __attribute__((always_inline,unused));
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inline uint32_t sqrt_uint32_approx(uint32_t in)
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{
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uint32_t n = sqrt_integer_guess_table[__builtin_clz(in)];
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n = ((in / n) + n) / 2;
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n = ((in / n) + n) / 2;
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return n;
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}
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