Release 4.16 lib/int_sqrt.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2013 Davidlohr Bueso <davidlohr.bueso@hp.com>
 *
 *  Based on the shift-and-subtract algorithm for computing integer
 *  square root from Guy L. Steele.
 */

#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/bitops.h>

/**
 * int_sqrt - computes the integer square root
 * @x: integer of which to calculate the sqrt
 *
 * Computes: floor(sqrt(x))
 */


unsigned long int_sqrt(unsigned long x)
{
	unsigned long b, m, y = 0;

	if (x <= 1)
		return x;

	m = 1UL << (__fls(x) & ~1UL);
	while (m != 0) {
		b = y + m;
		y >>= 1;

		if (x >= b) {
			x -= b;
			y += m;
		}
		m >>= 2;
	}

	return y;
}
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Andrew Morton
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Davidlohr Bueso A
35
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Peter Zijlstra
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2
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Peter Williams
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EXPORT_SYMBOL(int_sqrt);
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Davidlohr Bueso A
36
35.64%
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Peter Zijlstra
16
15.84%
3
37.50%
Peter Williams
2
1.98%
1
12.50%
Greg Kroah-Hartman
1
0.99%
1
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Paul Gortmaker
1
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1
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101
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8
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Directory: lib

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