[linux.git] / lib / ashrdi3.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 */

#include <linux/export.h>

#include <linux/libgcc.h>

long long notrace __ashrdi3(long long u, word_type b)
{
	DWunion uu, w;
	word_type bm;

	if (b == 0)
		return u;

	uu.ll = u;
	bm = 32 - b;

	if (bm <= 0) {
		/* w.s.high = 1..1 or 0..0 */
		w.s.high =
		    uu.s.high >> 31;
		w.s.low = uu.s.high >> -bm;
	} else {
		const unsigned int carries = (unsigned int) uu.s.high << bm;

		w.s.high = uu.s.high >> b;
		w.s.low = ((unsigned int) uu.s.low >> b) | carries;
	}

	return w.ll;
}
EXPORT_SYMBOL(__ashrdi3);
Commit	Line	Data
588cb88c	1	// SPDX-License-Identifier: GPL-2.0-or-later
b35cd988	2	/*
b35cd988 PD	3	*/
	4
	5	#include <linux/export.h>
	6
4db2b604	7	#include <linux/libgcc.h>
b35cd988 PD	8
	9	long long notrace __ashrdi3(long long u, word_type b)
	10	{
	11	DWunion uu, w;
	12	word_type bm;
	13
	14	if (b == 0)
	15	return u;
	16
	17	uu.ll = u;
	18	bm = 32 - b;
	19
	20	if (bm <= 0) {
	21	/* w.s.high = 1..1 or 0..0 */
	22	w.s.high =
	23	uu.s.high >> 31;
	24	w.s.low = uu.s.high >> -bm;
	25	} else {
	26	const unsigned int carries = (unsigned int) uu.s.high << bm;
	27
	28	w.s.high = uu.s.high >> b;
	29	w.s.low = ((unsigned int) uu.s.low >> b) \| carries;
	30	}
	31
	32	return w.ll;
	33	}
	34	EXPORT_SYMBOL(__ashrdi3);