Commit | Line | Data |
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1efea40d | 1 | /* |
c53c70a9 | 2 | * Copyright 2013 Tilera Corporation. All Rights Reserved. |
1efea40d CM |
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 | |
c53c70a9 CM |
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 | */ | |
41 | static inline uint64_t copy_byte(uint8_t byte) | |
42 | { | |
43 | return __insn_shufflebytes(byte, 0, 0); | |
44 | } |