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* [glibc/azanella/generic-strings] sh: Add string-fzb.h
@ 2023-01-13 20:03 Adhemerval Zanella
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From: Adhemerval Zanella @ 2023-01-13 20:03 UTC (permalink / raw)
To: glibc-cvs
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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