| /* |
| * 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 |