Contributors: 4
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Borislav Petkov |
144 |
83.72% |
3 |
50.00% |
| Denys Vlasenko |
22 |
12.79% |
1 |
16.67% |
| H. Peter Anvin |
5 |
2.91% |
1 |
16.67% |
| Greg Kroah-Hartman |
1 |
0.58% |
1 |
16.67% |
| Total |
172 |
|
6 |
|
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_HWEIGHT_H
#define _ASM_X86_HWEIGHT_H
#include <asm/cpufeatures.h>
#ifdef CONFIG_64BIT
/* popcnt %edi, %eax */
#define POPCNT32 ".byte 0xf3,0x0f,0xb8,0xc7"
/* popcnt %rdi, %rax */
#define POPCNT64 ".byte 0xf3,0x48,0x0f,0xb8,0xc7"
#define REG_IN "D"
#define REG_OUT "a"
#else
/* popcnt %eax, %eax */
#define POPCNT32 ".byte 0xf3,0x0f,0xb8,0xc0"
#define REG_IN "a"
#define REG_OUT "a"
#endif
#define __HAVE_ARCH_SW_HWEIGHT
static __always_inline unsigned int __arch_hweight32(unsigned int w)
{
unsigned int res;
asm (ALTERNATIVE("call __sw_hweight32", POPCNT32, X86_FEATURE_POPCNT)
: "="REG_OUT (res)
: REG_IN (w));
return res;
}
static inline unsigned int __arch_hweight16(unsigned int w)
{
return __arch_hweight32(w & 0xffff);
}
static inline unsigned int __arch_hweight8(unsigned int w)
{
return __arch_hweight32(w & 0xff);
}
#ifdef CONFIG_X86_32
static inline unsigned long __arch_hweight64(__u64 w)
{
return __arch_hweight32((u32)w) +
__arch_hweight32((u32)(w >> 32));
}
#else
static __always_inline unsigned long __arch_hweight64(__u64 w)
{
unsigned long res;
asm (ALTERNATIVE("call __sw_hweight64", POPCNT64, X86_FEATURE_POPCNT)
: "="REG_OUT (res)
: REG_IN (w));
return res;
}
#endif /* CONFIG_X86_32 */
#endif