1/*
 2 * Copyright 2013 Tilera Corporation. All Rights Reserved.
 3 *
 4 *   This program is free software; you can redistribute it and/or
 5 *   modify it under the terms of the GNU General Public License
 6 *   as published by the Free Software Foundation, version 2.
 7 *
 8 *   This program is distributed in the hope that it will be useful, but
 9 *   WITHOUT ANY WARRANTY; without even the implied warranty of
10 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 *   NON INFRINGEMENT.  See the GNU General Public License for
12 *   more details.
13 *
14 * Provide a mask based on the pointer alignment that
15 * sets up non-zero bytes before the beginning of the string.
16 * The MASK expression works because shift counts are taken mod 64.
17 * Also, specify how to count "first" and "last" bits
18 * when the bits have been read as a word.
19 */
20
21#include <asm/byteorder.h>
22
23#ifdef __LITTLE_ENDIAN
24#define MASK(x) (__insn_shl(1ULL, (x << 3)) - 1)
25#define NULMASK(x) ((2ULL << x) - 1)
26#define CFZ(x) __insn_ctz(x)
27#define REVCZ(x) __insn_clz(x)
28#else
29#define MASK(x) (__insn_shl(-2LL, ((-x << 3) - 1)))
30#define NULMASK(x) (-2LL << (63 - x))
31#define CFZ(x) __insn_clz(x)
32#define REVCZ(x) __insn_ctz(x)
33#endif
34
35/*
36 * Create eight copies of the byte in a uint64_t.  Byte Shuffle uses
37 * the bytes of srcB as the index into the dest vector to select a
38 * byte.  With all indices of zero, the first byte is copied into all
39 * the other bytes.
40 */
41static inline uint64_t copy_byte(uint8_t byte)
42{
43	return __insn_shufflebytes(byte, 0, 0);
44}