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/* Zero byte detection; boolean. SH4 version.
Copyright (C) 2023 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>
/* Determine if any bytes within X1 and X2 are equal. */
static __always_inline _Bool
has_eq (op_t x1, op_t x2)
{
int ret;
/* TODO: A compiler builtin for cmp/str would be much better. It is
difficult to use asm goto here, because the range of bt/bf are
quite small. */
asm("cmp/str %1,%2\n\t"
"movt %0"
: "=r" (ret) : "r" (x1), "r" (x2) : "t");
return ret;
}
/* Determine if any byte within X is zero. */
static __always_inline _Bool
has_zero (op_t x)
{
return has_eq (x, 0);
}
/* 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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