VisionFive2 Linux kernel

588cb88cedd56 (Thomas Gleixner   2019-05-23 11:14:57 +0200  1) // SPDX-License-Identifier: GPL-2.0-or-later
b35cd9884fa5d (Palmer Dabbelt    2017-05-23 10:28:26 -0700  2) /*
b35cd9884fa5d (Palmer Dabbelt    2017-05-23 10:28:26 -0700  3)  * lib/lshrdi3.c
b35cd9884fa5d (Palmer Dabbelt    2017-05-23 10:28:26 -0700  4)  */
b35cd9884fa5d (Palmer Dabbelt    2017-05-23 10:28:26 -0700  5) 
b35cd9884fa5d (Palmer Dabbelt    2017-05-23 10:28:26 -0700  6) #include <linux/module.h>
4db2b604c05af (Christoph Hellwig 2017-11-22 11:47:28 +0100  7) #include <linux/libgcc.h>
b35cd9884fa5d (Palmer Dabbelt    2017-05-23 10:28:26 -0700  8) 
b35cd9884fa5d (Palmer Dabbelt    2017-05-23 10:28:26 -0700  9) long long notrace __lshrdi3(long long u, word_type b)
b35cd9884fa5d (Palmer Dabbelt    2017-05-23 10:28:26 -0700 10) {
b35cd9884fa5d (Palmer Dabbelt    2017-05-23 10:28:26 -0700 11) 	DWunion uu, w;
b35cd9884fa5d (Palmer Dabbelt    2017-05-23 10:28:26 -0700 12) 	word_type bm;
b35cd9884fa5d (Palmer Dabbelt    2017-05-23 10:28:26 -0700 13) 
b35cd9884fa5d (Palmer Dabbelt    2017-05-23 10:28:26 -0700 14) 	if (b == 0)
b35cd9884fa5d (Palmer Dabbelt    2017-05-23 10:28:26 -0700 15) 		return u;
b35cd9884fa5d (Palmer Dabbelt    2017-05-23 10:28:26 -0700 16) 
b35cd9884fa5d (Palmer Dabbelt    2017-05-23 10:28:26 -0700 17) 	uu.ll = u;
b35cd9884fa5d (Palmer Dabbelt    2017-05-23 10:28:26 -0700 18) 	bm = 32 - b;
b35cd9884fa5d (Palmer Dabbelt    2017-05-23 10:28:26 -0700 19) 
b35cd9884fa5d (Palmer Dabbelt    2017-05-23 10:28:26 -0700 20) 	if (bm <= 0) {
b35cd9884fa5d (Palmer Dabbelt    2017-05-23 10:28:26 -0700 21) 		w.s.high = 0;
b35cd9884fa5d (Palmer Dabbelt    2017-05-23 10:28:26 -0700 22) 		w.s.low = (unsigned int) uu.s.high >> -bm;
b35cd9884fa5d (Palmer Dabbelt    2017-05-23 10:28:26 -0700 23) 	} else {
b35cd9884fa5d (Palmer Dabbelt    2017-05-23 10:28:26 -0700 24) 		const unsigned int carries = (unsigned int) uu.s.high << bm;
b35cd9884fa5d (Palmer Dabbelt    2017-05-23 10:28:26 -0700 25) 
b35cd9884fa5d (Palmer Dabbelt    2017-05-23 10:28:26 -0700 26) 		w.s.high = (unsigned int) uu.s.high >> b;
b35cd9884fa5d (Palmer Dabbelt    2017-05-23 10:28:26 -0700 27) 		w.s.low = ((unsigned int) uu.s.low >> b) | carries;
b35cd9884fa5d (Palmer Dabbelt    2017-05-23 10:28:26 -0700 28) 	}
b35cd9884fa5d (Palmer Dabbelt    2017-05-23 10:28:26 -0700 29) 
b35cd9884fa5d (Palmer Dabbelt    2017-05-23 10:28:26 -0700 30) 	return w.ll;
b35cd9884fa5d (Palmer Dabbelt    2017-05-23 10:28:26 -0700 31) }
b35cd9884fa5d (Palmer Dabbelt    2017-05-23 10:28:26 -0700 32) EXPORT_SYMBOL(__lshrdi3);