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From: Adhemerval Zanella <azanella@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc/azanella/generic-strings] sh: Add string-fzb.h Date: Fri, 13 Jan 2023 20:03:55 +0000 (GMT) [thread overview] Message-ID: <20230113200355.C43EF38493D3@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=75037100671faaacca3cf89106a06c4df7988ff4 commit 75037100671faaacca3cf89106a06c4df7988ff4 Author: Adhemerval Zanella Netto <adhemerval.zanella@linaro.org> Date: Tue Jan 10 18:01:06 2023 -0300 sh: Add string-fzb.h Use the SH cmp/str on has_{zero,eq,zero_eq}. Checked on sh4-linux-gnu. Diff: --- sysdeps/sh/string-fzb.h | 55 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) diff --git a/sysdeps/sh/string-fzb.h b/sysdeps/sh/string-fzb.h new file mode 100644 index 0000000000..c8dd176362 --- /dev/null +++ b/sysdeps/sh/string-fzb.h @@ -0,0 +1,55 @@ +/* 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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