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/* Zero byte detection; boolean. Alpha version.
Copyright (C) 2023-2024 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
<http://www.gnu.org/licenses/>. */
#ifndef _STRING_FZB_H
#define _STRING_FZB_H 1
#include <sys/cdefs.h>
#include <string-optype.h>
/* Note that since CMPBGE creates a bit mask rather than a byte mask,
we cannot simply provide a target-specific string-fza.h. */
/* Determine if any byte within X is zero. This is a pure boolean test. */
static __always_inline _Bool
has_zero (op_t x)
{
return __builtin_alpha_cmpbge (0, x) != 0;
}
/* Likewise, but for byte equality between X1 and X2. */
static __always_inline _Bool
has_eq (op_t x1, op_t x2)
{
return has_zero (x1 ^ x2);
}
/* Likewise, but for zeros in X1 and equal bytes between X1 and X2. */
static __always_inline _Bool
has_zero_eq (op_t x1, op_t x2)
{
return has_zero (x1) | has_eq (x1, x2);
}
#endif /* _STRING_FZB_H */
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