From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
To: libc-alpha@sourceware.org,
Richard Henderson <richard.henderson@linaro.org>,
Noah Goldstein <goldstein.w.n@gmail.com>
Subject: [PATCH v10 16/24] powerpc: Add string-fza.h
Date: Fri, 20 Jan 2023 18:16:14 -0300 [thread overview]
Message-ID: <20230120211622.3445279-17-adhemerval.zanella@linaro.org> (raw)
In-Reply-To: <20230120211622.3445279-1-adhemerval.zanella@linaro.org>
From: Richard Henderson <richard.henderson@linaro.org>
While ppc has the more important string functions in assembly,
there are still a few generic routines used.
Use the Power 6 CMPB insn for testing of zeros.
Checked on powerpc64le-linux-gnu.
---
sysdeps/powerpc/string-fza.h | 72 ++++++++++++++++++++++++++++++++++++
1 file changed, 72 insertions(+)
create mode 100644 sysdeps/powerpc/string-fza.h
diff --git a/sysdeps/powerpc/string-fza.h b/sysdeps/powerpc/string-fza.h
new file mode 100644
index 0000000000..5dec740041
--- /dev/null
+++ b/sysdeps/powerpc/string-fza.h
@@ -0,0 +1,72 @@
+/* Zero byte detection; basics. PowerPC 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 _POWERPC_STRING_FZA_H
+#define _POWERPC_STRING_FZA_H 1
+
+/* PowerISA 2.05 (POWER6) provides cmpb instruction. */
+#ifdef _ARCH_PWR6
+# include <string-misc.h>
+# include <string-optype.h>
+
+/* The functions return a byte mask. */
+typedef op_t find_t;
+
+/* This function returns 0xff for each byte that is
+ equal between X1 and X2. */
+
+static __always_inline find_t
+find_eq_all (op_t x1, op_t x2)
+{
+ return __builtin_cmpb (x1, x2);
+}
+
+/* This function returns 0xff for each byte that is zero in X. */
+
+static __always_inline find_t
+find_zero_all (op_t x)
+{
+ return find_eq_all (x, 0);
+}
+
+/* Identify zero bytes in X1 or equality between X1 and X2. */
+
+static __always_inline find_t
+find_zero_eq_all (op_t x1, op_t x2)
+{
+ return find_zero_all (x1) | find_eq_all (x1, x2);
+}
+
+/* Identify zero bytes in X1 or inequality between X1 and X2. */
+
+static __always_inline find_t
+find_zero_ne_all (op_t x1, op_t x2)
+{
+ return find_zero_all (x1) | ~find_eq_all (x1, x2);
+}
+
+/* Define the "inexact" versions in terms of the exact versions. */
+# define find_zero_low find_zero_all
+# define find_eq_low find_eq_all
+# define find_zero_eq_low find_zero_eq_all
+# define find_zero_ne_low find_zero_ne_all
+#else
+# include <sysdeps/generic/string-fza.h>
+#endif /* _ARCH_PWR6 */
+
+#endif /* _POWERPC_STRING_FZA_H */
--
2.34.1
next prev parent reply other threads:[~2023-01-20 21:17 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-20 21:15 [PATCH v10 00/24] Improve generic string routines Adhemerval Zanella
2023-01-20 21:15 ` [PATCH v10 01/24] Parameterize op_t from memcopy.h Adhemerval Zanella
2023-01-20 21:16 ` [PATCH v10 02/24] Parameterize OP_T_THRES " Adhemerval Zanella
2023-01-20 21:16 ` [PATCH v10 03/24] Add string vectorized find and detection functions Adhemerval Zanella
2023-01-20 21:16 ` [PATCH v10 04/24] string: Improve generic strlen Adhemerval Zanella
2023-01-20 21:16 ` [PATCH v10 05/24] string: Improve generic strnlen Adhemerval Zanella
2023-01-20 21:16 ` [PATCH v10 06/24] string: Improve generic strchr Adhemerval Zanella
2023-01-20 21:16 ` [PATCH v10 07/24] string: Improve generic strchrnul Adhemerval Zanella
2023-01-20 21:16 ` [PATCH v10 08/24] string: Improve generic strcmp Adhemerval Zanella
2023-01-20 21:16 ` [PATCH v10 09/24] string: Improve generic strncmp Adhemerval Zanella
2023-01-20 21:16 ` [PATCH v10 10/24] string: Improve generic memchr Adhemerval Zanella
2023-01-20 21:16 ` [PATCH v10 11/24] string: Improve generic memrchr Adhemerval Zanella
2023-01-20 21:16 ` [PATCH v10 12/24] hppa: Add memcopy.h Adhemerval Zanella
2023-01-20 21:16 ` [PATCH v10 13/24] hppa: Add string-fzb.h and string-fzi.h Adhemerval Zanella
2023-01-20 21:16 ` [PATCH v10 14/24] alpha: " Adhemerval Zanella
2023-01-20 21:16 ` [PATCH v10 15/24] arm: Add string-fza.h Adhemerval Zanella
2023-01-20 21:16 ` Adhemerval Zanella [this message]
2023-01-20 21:16 ` [PATCH v10 17/24] sh: Add string-fzb.h Adhemerval Zanella
2023-01-20 21:16 ` [PATCH v10 18/24] string: Hook up the default implementation on test-strlen Adhemerval Zanella
2023-01-20 21:16 ` [PATCH v10 19/24] string: Hook up the default implementation on test-strnlen Adhemerval Zanella
2023-01-20 21:16 ` [PATCH v10 20/24] string: Hook up the default implementation on test-strchr Adhemerval Zanella
2023-01-20 21:16 ` [PATCH v10 21/24] string: Hook up the default implementation on test-strcmp Adhemerval Zanella
2023-01-20 21:16 ` [PATCH v10 22/24] string: Hook up the default implementation on test-strncmp Adhemerval Zanella
2023-01-20 21:16 ` [PATCH v10 23/24] string: Hook up the default implementation on test-memchr Adhemerval Zanella
2023-01-20 21:16 ` [PATCH v10 24/24] string: Hook up the default implementation on test-memrchr Adhemerval Zanella
2023-01-20 23:00 ` [PATCH v10 00/24] Improve generic string routines Jeff Law
2023-01-27 16:52 ` Adhemerval Zanella Netto
2023-01-27 19:36 ` Richard Henderson
2023-01-30 13:26 ` Adhemerval Zanella Netto
2023-01-30 18:37 ` Jeff Law
2023-01-28 14:30 ` Xi Ruoyao
2023-01-30 13:10 ` Adhemerval Zanella Netto
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