forked from Minki/linux
34 lines
1.2 KiB
C
34 lines
1.2 KiB
C
|
/*
|
||
|
|
* Copyright 2011 Tilera Corporation. All Rights Reserved.
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or
|
||
|
|
* modify it under the terms of the GNU General Public License
|
||
|
|
* as published by the Free Software Foundation, version 2.
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope that it will be useful, but
|
||
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
|
||
|
|
* NON INFRINGEMENT. See the GNU General Public License for
|
||
|
|
* more details.
|
||
|
|
*
|
||
|
|
* Provide a mask based on the pointer alignment that
|
||
|
|
* sets up non-zero bytes before the beginning of the string.
|
||
|
|
* The MASK expression works because shift counts are taken mod 64.
|
||
|
|
* Also, specify how to count "first" and "last" bits
|
||
|
|
* when the bits have been read as a word.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <asm/byteorder.h>
|
||
|
|
|
||
|
|
#ifdef __LITTLE_ENDIAN
|
||
|
|
#define MASK(x) (__insn_shl(1ULL, (x << 3)) - 1)
|
||
|
|
#define NULMASK(x) ((2ULL << x) - 1)
|
||
|
|
#define CFZ(x) __insn_ctz(x)
|
||
|
|
#define REVCZ(x) __insn_clz(x)
|
||
|
|
#else
|
||
|
|
#define MASK(x) (__insn_shl(-2LL, ((-x << 3) - 1)))
|
||
|
|
#define NULMASK(x) (-2LL << (63 - x))
|
||
|
|
#define CFZ(x) __insn_clz(x)
|
||
|
|
#define REVCZ(x) __insn_ctz(x)
|
||
|
|
#endif
|