/* Zero byte detection; indexes. LoongArch version.
Copyright (C) 2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
. */
#ifndef _STRING_FZI_H
#define _STRING_FZI_H 1
#include
#include
#include
#include
#include
#include
/* A subroutine for the index_zero functions. Given a test word C, return
the (memory order) index of the first byte (in memory order) that is
non-zero. */
static inline unsigned int
index_first_ (op_t c)
{
_Static_assert (sizeof (op_t) == sizeof (long), "op_t must be long");
return __builtin_ctzl (c) / CHAR_BIT;
}
/* Similarly, but return the (memory order) index of the last byte that is
non-zero. */
static inline unsigned int
index_last_ (op_t c)
{
_Static_assert (sizeof (op_t) == sizeof (long), "op_t must be long");
return sizeof (op_t) - 1 - (__builtin_clzl (c) / CHAR_BIT);
}
/* Given a word X that is known to contain a zero byte, return the index of
the first such within the word in memory order. */
static inline unsigned int
index_first_zero (op_t x)
{
x = find_zero_low (x);
return index_first_ (x);
}
/* Similarly, but perform the search for byte equality between X1 and X2. */
static inline unsigned int
index_first_eq (op_t x1, op_t x2)
{
x1 = find_eq_low (x1, x2);
return index_first_ (x1);
}
/* Similarly, but perform the search for zero within X1 or equality between
X1 and X2. */
static inline unsigned int
index_first_zero_eq (op_t x1, op_t x2)
{
x1 = find_zero_eq_low (x1, x2);
return index_first_ (x1);
}
/* Similarly, but perform the search for zero within X1 or inequality between
X1 and X2. */
static inline unsigned int
index_first_zero_ne (op_t x1, op_t x2)
{
x1 = find_zero_ne_low (x1, x2);
return index_first_ (x1);
}
/* Similarly, but search for the last zero within X. */
static inline unsigned int
index_last_zero (op_t x)
{
x = find_zero_all (x);
return index_last_ (x);
}
static inline unsigned int
index_last_eq (op_t x1, op_t x2)
{
return index_last_zero (x1 ^ x2);
}
#endif /* STRING_FZI_H */