xref: /OK3568_Linux_fs/kernel/arch/x86/include/asm/arch_hweight.h (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun #ifndef _ASM_X86_HWEIGHT_H
3*4882a593Smuzhiyun #define _ASM_X86_HWEIGHT_H
4*4882a593Smuzhiyun 
5*4882a593Smuzhiyun #include <asm/cpufeatures.h>
6*4882a593Smuzhiyun 
7*4882a593Smuzhiyun #ifdef CONFIG_64BIT
8*4882a593Smuzhiyun #define REG_IN "D"
9*4882a593Smuzhiyun #define REG_OUT "a"
10*4882a593Smuzhiyun #else
11*4882a593Smuzhiyun #define REG_IN "a"
12*4882a593Smuzhiyun #define REG_OUT "a"
13*4882a593Smuzhiyun #endif
14*4882a593Smuzhiyun 
__arch_hweight32(unsigned int w)15*4882a593Smuzhiyun static __always_inline unsigned int __arch_hweight32(unsigned int w)
16*4882a593Smuzhiyun {
17*4882a593Smuzhiyun 	unsigned int res;
18*4882a593Smuzhiyun 
19*4882a593Smuzhiyun 	asm (ALTERNATIVE("call __sw_hweight32", "popcntl %1, %0", X86_FEATURE_POPCNT)
20*4882a593Smuzhiyun 			 : "="REG_OUT (res)
21*4882a593Smuzhiyun 			 : REG_IN (w));
22*4882a593Smuzhiyun 
23*4882a593Smuzhiyun 	return res;
24*4882a593Smuzhiyun }
25*4882a593Smuzhiyun 
__arch_hweight16(unsigned int w)26*4882a593Smuzhiyun static inline unsigned int __arch_hweight16(unsigned int w)
27*4882a593Smuzhiyun {
28*4882a593Smuzhiyun 	return __arch_hweight32(w & 0xffff);
29*4882a593Smuzhiyun }
30*4882a593Smuzhiyun 
__arch_hweight8(unsigned int w)31*4882a593Smuzhiyun static inline unsigned int __arch_hweight8(unsigned int w)
32*4882a593Smuzhiyun {
33*4882a593Smuzhiyun 	return __arch_hweight32(w & 0xff);
34*4882a593Smuzhiyun }
35*4882a593Smuzhiyun 
36*4882a593Smuzhiyun #ifdef CONFIG_X86_32
__arch_hweight64(__u64 w)37*4882a593Smuzhiyun static inline unsigned long __arch_hweight64(__u64 w)
38*4882a593Smuzhiyun {
39*4882a593Smuzhiyun 	return  __arch_hweight32((u32)w) +
40*4882a593Smuzhiyun 		__arch_hweight32((u32)(w >> 32));
41*4882a593Smuzhiyun }
42*4882a593Smuzhiyun #else
__arch_hweight64(__u64 w)43*4882a593Smuzhiyun static __always_inline unsigned long __arch_hweight64(__u64 w)
44*4882a593Smuzhiyun {
45*4882a593Smuzhiyun 	unsigned long res;
46*4882a593Smuzhiyun 
47*4882a593Smuzhiyun 	asm (ALTERNATIVE("call __sw_hweight64", "popcntq %1, %0", X86_FEATURE_POPCNT)
48*4882a593Smuzhiyun 			 : "="REG_OUT (res)
49*4882a593Smuzhiyun 			 : REG_IN (w));
50*4882a593Smuzhiyun 
51*4882a593Smuzhiyun 	return res;
52*4882a593Smuzhiyun }
53*4882a593Smuzhiyun #endif /* CONFIG_X86_32 */
54*4882a593Smuzhiyun 
55*4882a593Smuzhiyun #endif
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