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1538 killagreg 1 
#ifndef _ISQRT_H
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#define _ISQRT_H
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#include <inttypes.h>
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// coded in assembler file
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extern uint16_t isqrt32(uint32_t n);
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extern uint8_t  isqrt16(uint16_t n);
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extern uint16_t ihypot(int16_t x, int16_t y);
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#endif // _ISQRT_H