From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
To: libc-alpha@sourceware.org
Cc: Richard Henderson <rth@twiddle.net>
Subject: [PATCH v3 17/18] powerpc: Add string-fza.h
Date: Wed, 10 Jan 2018 12:48:00 -0000 [thread overview]
Message-ID: <1515588482-15744-18-git-send-email-adhemerval.zanella@linaro.org> (raw)
In-Reply-To: <1515588482-15744-1-git-send-email-adhemerval.zanella@linaro.org>
From: Richard Henderson <rth@twiddle.net>
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.
Richard Henderson <rth@twiddle.net>
* sysdeps/powerpc/power6/string-fza.h: New file.
* sysdeps/powerpc/powerpc32/power6/string-fza.h: Likewise.
* sysdeps/powerpc/powerpc64/power6/string-fza.h: Likewise.
---
sysdeps/powerpc/power6/string-fza.h | 65 +++++++++++++++++++++++++++
sysdeps/powerpc/powerpc32/power6/string-fza.h | 1 +
sysdeps/powerpc/powerpc64/power6/string-fza.h | 1 +
3 files changed, 67 insertions(+)
create mode 100644 sysdeps/powerpc/power6/string-fza.h
create mode 100644 sysdeps/powerpc/powerpc32/power6/string-fza.h
create mode 100644 sysdeps/powerpc/powerpc64/power6/string-fza.h
diff --git a/sysdeps/powerpc/power6/string-fza.h b/sysdeps/powerpc/power6/string-fza.h
new file mode 100644
index 0000000..4549dde
--- /dev/null
+++ b/sysdeps/powerpc/power6/string-fza.h
@@ -0,0 +1,65 @@
+/* Zero byte detection; basics. Power6/ISA 2.03 version.
+ Copyright (C) 2018 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_FZA_H
+#define STRING_FZA_H 1
+
+#include <string-optype.h>
+
+/* This function returns 0xff for each byte that is
+ equal between X1 and X2. */
+
+static inline op_t
+find_eq_all (op_t x1, op_t x2)
+{
+ op_t ret;
+ asm ("cmpb %0,%1,%2" : "=r"(ret) : "r"(x1), "r"(x2));
+ return ret;
+}
+
+/* This function returns 0xff for each byte that is zero in X. */
+
+static inline op_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 inline op_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 inline op_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
+
+#endif /* STRING_FZA_H */
diff --git a/sysdeps/powerpc/powerpc32/power6/string-fza.h b/sysdeps/powerpc/powerpc32/power6/string-fza.h
new file mode 100644
index 0000000..bb00d7c
--- /dev/null
+++ b/sysdeps/powerpc/powerpc32/power6/string-fza.h
@@ -0,0 +1 @@
+#include <sysdeps/powerpc/power6/string-fza.h>
diff --git a/sysdeps/powerpc/powerpc64/power6/string-fza.h b/sysdeps/powerpc/powerpc64/power6/string-fza.h
new file mode 100644
index 0000000..bb00d7c
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/power6/string-fza.h
@@ -0,0 +1 @@
+#include <sysdeps/powerpc/power6/string-fza.h>
--
2.7.4
next prev parent reply other threads:[~2018-01-10 12:48 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-10 12:48 [PATCH v3 00/18] Improve generic string routines Adhemerval Zanella
2018-01-10 12:48 ` [PATCH v3 08/18] string: Improve generic strnlen Adhemerval Zanella
2018-01-10 12:48 ` [PATCH v3 06/18] string: Improve generic memchr Adhemerval Zanella
2018-01-10 12:48 ` Adhemerval Zanella [this message]
2018-01-10 12:56 ` [PATCH v3 17/18] powerpc: Add string-fza.h Tulio Magno Quites Machado Filho
2018-01-10 12:48 ` [PATCH v3 02/18] Parameterize OP_T_THRES from memcopy.h Adhemerval Zanella
2018-01-10 12:48 ` [PATCH v3 14/18] hppa: Add string-fzb.h and string-fzi.h Adhemerval Zanella
2018-01-10 12:48 ` [PATCH v3 01/18] Parameterize op_t from memcopy.h Adhemerval Zanella
2018-01-11 13:28 ` Joseph Myers
2018-01-11 18:04 ` Adhemerval Zanella
2018-01-10 12:48 ` [PATCH v3 15/18] alpha: Add string-fzb.h and string-fzi.h Adhemerval Zanella
2018-01-10 12:48 ` [PATCH v3 05/18] string: Improve generic strlen Adhemerval Zanella
2018-01-11 17:21 ` Paul Eggert
2018-01-12 18:00 ` Adhemerval Zanella
2018-01-10 12:48 ` [PATCH v3 10/18] string: Improve generic strchrnul Adhemerval Zanella
2018-01-10 12:48 ` [PATCH v3 13/18] hppa: Add memcopy.h Adhemerval Zanella
2018-01-11 13:36 ` Joseph Myers
2018-01-12 18:01 ` Adhemerval Zanella
2018-01-12 18:18 ` Joseph Myers
2018-01-12 18:37 ` Adhemerval Zanella
2018-01-10 12:48 ` [PATCH v3 04/18] Add string vectorized find and detection functions Adhemerval Zanella
2018-01-11 13:34 ` Joseph Myers
2018-01-11 18:25 ` Adhemerval Zanella
2018-01-11 13:44 ` Luis Machado
2018-01-11 18:25 ` Adhemerval Zanella
2018-01-11 16:47 ` Paul Eggert
2018-01-11 18:54 ` Adhemerval Zanella
2018-01-12 1:08 ` Paul Eggert
2018-01-12 17:08 ` Joseph Myers
2018-01-12 17:59 ` Adhemerval Zanella
2018-01-12 13:30 ` Adhemerval Zanella
2018-01-10 12:48 ` [PATCH v3 18/18] sh: Add string-fzb.h Adhemerval Zanella
2018-01-10 12:48 ` [PATCH v3 11/18] string: Improve generic strcmp Adhemerval Zanella
2018-01-10 12:48 ` [PATCH v3 03/18] Add string-maskoff.h generic header Adhemerval Zanella
2018-01-10 23:25 ` Paul Eggert
2018-01-11 10:54 ` Adhemerval Zanella
2018-01-11 13:29 ` Joseph Myers
2018-01-11 17:57 ` Adhemerval Zanella
2018-01-10 12:48 ` [PATCH v3 09/18] string: Improve generic strchr Adhemerval Zanella
2018-01-10 12:48 ` [PATCH v3 07/18] string: Improve generic memrchr Adhemerval Zanella
2018-01-10 12:48 ` [PATCH v3 12/18] string: Improve generic strcpy Adhemerval Zanella
2018-01-10 12:48 ` [PATCH v3 16/18] arm: Add string-fza.h Adhemerval Zanella
2018-01-10 22:30 ` [PATCH v3 00/18] Improve generic string routines Ondřej Bílka
2018-01-11 10:54 ` Adhemerval Zanella
2018-01-11 13:50 ` Joseph Myers
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