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44 lines
1.5 KiB
44 lines
1.5 KiB
/* |
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* Copyright 2013 Tilera Corporation. All Rights Reserved. |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License |
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* as published by the Free Software Foundation, version 2. |
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* |
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* This program is distributed in the hope that it will be useful, but |
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* WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
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* NON INFRINGEMENT. See the GNU General Public License for |
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* more details. |
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* |
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* Provide a mask based on the pointer alignment that |
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* sets up non-zero bytes before the beginning of the string. |
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* The MASK expression works because shift counts are taken mod 64. |
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* Also, specify how to count "first" and "last" bits |
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* when the bits have been read as a word. |
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*/ |
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#include <asm/byteorder.h> |
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#ifdef __LITTLE_ENDIAN |
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#define MASK(x) (__insn_shl(1ULL, (x << 3)) - 1) |
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#define NULMASK(x) ((2ULL << x) - 1) |
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#define CFZ(x) __insn_ctz(x) |
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#define REVCZ(x) __insn_clz(x) |
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#else |
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#define MASK(x) (__insn_shl(-2LL, ((-x << 3) - 1))) |
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#define NULMASK(x) (-2LL << (63 - x)) |
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#define CFZ(x) __insn_clz(x) |
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#define REVCZ(x) __insn_ctz(x) |
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#endif |
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/* |
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* Create eight copies of the byte in a uint64_t. Byte Shuffle uses |
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* the bytes of srcB as the index into the dest vector to select a |
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* byte. With all indices of zero, the first byte is copied into all |
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* the other bytes. |
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*/ |
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static inline uint64_t copy_byte(uint8_t byte) |
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{ |
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return __insn_shufflebytes(byte, 0, 0); |
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}
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