66 lines
1.3 KiB
C
Executable File
66 lines
1.3 KiB
C
Executable File
/*
|
|
* lib/clz_ctz.c
|
|
*
|
|
* Copyright (C) 2013 Chanho Min <chanho.min@lge.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
* The functions in this file aren't called directly, but are required by
|
|
* GCC builtins such as __builtin_ctz, and therefore they can't be removed
|
|
* despite appearing unreferenced in kernel source.
|
|
*
|
|
* __c[lt]z[sd]i2 can be overridden by linking arch-specific versions.
|
|
*/
|
|
|
|
#include <linux/export.h>
|
|
#include <linux/kernel.h>
|
|
|
|
int __weak __ctzsi2(int val);
|
|
int __weak __ctzsi2(int val)
|
|
{
|
|
return __ffs(val);
|
|
}
|
|
EXPORT_SYMBOL(__ctzsi2);
|
|
|
|
int __weak __clzsi2(int val);
|
|
int __weak __clzsi2(int val)
|
|
{
|
|
return 32 - fls(val);
|
|
}
|
|
EXPORT_SYMBOL(__clzsi2);
|
|
|
|
int __weak __clzdi2(long val);
|
|
int __weak __ctzdi2(long val);
|
|
#if BITS_PER_LONG == 32
|
|
|
|
int __weak __clzdi2(long val)
|
|
{
|
|
return 32 - fls((int)val);
|
|
}
|
|
EXPORT_SYMBOL(__clzdi2);
|
|
|
|
int __weak __ctzdi2(long val)
|
|
{
|
|
return __ffs((u32)val);
|
|
}
|
|
EXPORT_SYMBOL(__ctzdi2);
|
|
|
|
#elif BITS_PER_LONG == 64
|
|
|
|
int __weak __clzdi2(long val)
|
|
{
|
|
return 64 - fls64((u64)val);
|
|
}
|
|
EXPORT_SYMBOL(__clzdi2);
|
|
|
|
int __weak __ctzdi2(long val)
|
|
{
|
|
return __ffs64((u64)val);
|
|
}
|
|
EXPORT_SYMBOL(__ctzdi2);
|
|
|
|
#else
|
|
#error BITS_PER_LONG not 32 or 64
|
|
#endif
|