1 /* SPDX-License-Identifier: GPL-2.0-only */
3  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
23  * This is a pure count, so (1-32) or (0-31) doesn't apply
24  * It could be 0 to 32, based on num of 0's in there
25  * clz(0x8000_0000) = 0, clz(0xFFFF_FFFF)=0, clz(0) = 32, clz(1) = 31
32 	"	norm.f  %0, %1		\n"  in clz()
33 	"	mov.n   %0, 0		\n"  in clz()
34 	"	add.p   %0, %0, 1	\n"  in clz()
47 		return 0;  in constant_fls()
48 	if (!(x & 0xffff0000u)) {  in constant_fls()
50 		r -= 16;  in constant_fls()
52 	if (!(x & 0xff000000u)) {  in constant_fls()
54 		r -= 8;  in constant_fls()
56 	if (!(x & 0xf0000000u)) {  in constant_fls()
58 		r -= 4;  in constant_fls()
60 	if (!(x & 0xc0000000u)) {  in constant_fls()
62 		r -= 2;  in constant_fls()
64 	if (!(x & 0x80000000u))  in constant_fls()
65 		r -= 1;  in constant_fls()
71  * @result: [1-32]
72  * fls(1) = 1, fls(0x80000000) = 32, fls(0) = 0
79 	return 32 - clz(x);  in fls()
83  * __fls: Similar to fls, but zero based (0-31)
88 		return 0;  in __fls()
90 		return fls(x) - 1;  in __fls()
95  * @result: [1-32], 0 if all 0's
97 #define ffs(x)	({ unsigned long __t = (x); fls(__t & -__t); })
100  * __ffs: Similar to ffs, but zero based (0-31)
107 	return ffs(word) - 1;  in __ffs()
114  * @result: [1-32]
115  * fls(1) = 1, fls(0x80000000) = 32, fls(0) = 0
122 	"	fls.f	%0, %1		\n"  /* 0:31; 0(Z) if src 0 */  in fls()
123 	"	add.nz	%0, %0, 1	\n"  /* 0:31 -> 1:32 */  in fls()
132  * __fls: Similar to fls, but zero based (0-31). Also 0 if no bit set
142  * @result: [1-32], 0 if all 0's
149 	"	ffs.f	%0, %1		\n"  /* 0:31; 31(Z) if src 0 */  in ffs()
150 	"	add.nz	%0, %0, 1	\n"  /* 0:31 -> 1:32 */  in ffs()
151 	"	mov.z	%0, 0		\n"  /* 31(Z)-> 0 */  in ffs()
160  * __ffs: Similar to ffs, but zero based (0-31)
167 	"	ffs.f	%0, %1		\n"  /* 0:31; 31(Z) if src 0 */  in __ffs()
168 	"	mov.z	%0, 0		\n"  /* 31(Z)-> 0 */  in __ffs()
181  * @return:[0-31], 32 if all 1's
185 #include <asm-generic/bitops/hweight.h>
186 #include <asm-generic/bitops/fls64.h>
187 #include <asm-generic/bitops/sched.h>
188 #include <asm-generic/bitops/lock.h>
189 #include <asm-generic/bitops/atomic.h>
190 #include <asm-generic/bitops/non-atomic.h>
192 #include <asm-generic/bitops/le.h>
193 #include <asm-generic/bitops/ext2-atomic-setbit.h>