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From 4c98816d5248bed13b1d8388efc0c47fe869300f Mon Sep 17 00:00:00 2001
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From: Stefan Liebler <stli@linux.vnet.ibm.com>
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Date: Thu, 8 Oct 2015 11:02:10 +0200
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Subject: [PATCH 12/30] S390: Optimize strcpy and wcscpy.
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upstream-commit-id: 680df122ab8a07806cb38d044292896334f76c01
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https://www.sourceware.org/ml/libc-alpha/2015-07/msg00157.html
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This patch provides optimized versions of strcpy and wcscpy with the z13
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vector instructions.
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ChangeLog:
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	* sysdeps/s390/multiarch/strcpy-vx.S: New File.
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	* sysdeps/s390/multiarch/strcpy.c: Likewise.
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	* sysdeps/s390/multiarch/wcscpy-c.c: Likewise.
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	* sysdeps/s390/multiarch/wcscpy-vx.S: Likewise.
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	* sysdeps/s390/multiarch/wcscpy.c: Likewise.
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	* sysdeps/s390/s390-32/multiarch/strcpy.c: Likewise.
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	* sysdeps/s390/s390-64/multiarch/strcpy.c: Likewise.
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	* sysdeps/s390/multiarch/Makefile (sysdep_routines): Add strcpy and
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	wcscpy functions.
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	* sysdeps/s390/multiarch/ifunc-impl-list.c
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	(__libc_ifunc_impl_list): Add ifunc test for strcpy, wcscpy.
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	* benchtests/bench-wcscpy.c: New File.
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	* benchtests/Makefile (wcsmbs-bench): Add wcscpy.
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---
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 benchtests/Makefile                      |   2 +-
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 benchtests/bench-wcscpy.c                |  20 ++++++
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 sysdeps/s390/multiarch/Makefile          |   6 +-
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 sysdeps/s390/multiarch/ifunc-impl-list.c |   3 +
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 sysdeps/s390/multiarch/strcpy-vx.S       | 109 ++++++++++++++++++++++++++++++
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 sysdeps/s390/multiarch/strcpy.c          |  24 +++++++
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 sysdeps/s390/multiarch/wcscpy-c.c        |  25 +++++++
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 sysdeps/s390/multiarch/wcscpy-vx.S       | 111 +++++++++++++++++++++++++++++++
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 sysdeps/s390/multiarch/wcscpy.c          |  27 ++++++++
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 sysdeps/s390/s390-32/multiarch/strcpy.c  |  21 ++++++
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 sysdeps/s390/s390-64/multiarch/strcpy.c  |  21 ++++++
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 11 files changed, 366 insertions(+), 3 deletions(-)
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 create mode 100644 benchtests/bench-wcscpy.c
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 create mode 100644 sysdeps/s390/multiarch/strcpy-vx.S
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 create mode 100644 sysdeps/s390/multiarch/strcpy.c
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 create mode 100644 sysdeps/s390/multiarch/wcscpy-c.c
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 create mode 100644 sysdeps/s390/multiarch/wcscpy-vx.S
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 create mode 100644 sysdeps/s390/multiarch/wcscpy.c
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 create mode 100644 sysdeps/s390/s390-32/multiarch/strcpy.c
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 create mode 100644 sysdeps/s390/s390-64/multiarch/strcpy.c
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diff --git a/benchtests/Makefile b/benchtests/Makefile
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index 7bb2eef..1dda844 100644
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--- a/benchtests/Makefile
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+++ b/benchtests/Makefile
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@@ -38,7 +38,7 @@ string-bench := bcopy bzero memccpy memchr memcmp memcpy memmem memmove \
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 		strcat strchr strchrnul strcmp strcpy strcspn strlen \
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 		strncasecmp strncat strncmp strncpy strnlen strpbrk strrchr \
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 		strspn strstr strcpy_chk stpcpy_chk memrchr strsep strtok
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-wcsmbs-bench := wcslen wcsnlen
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+wcsmbs-bench := wcslen wcsnlen wcscpy
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 string-bench-all := $(string-bench) ${wcsmbs-bench}
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 stdlib-bench := strtod
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diff --git a/benchtests/bench-wcscpy.c b/benchtests/bench-wcscpy.c
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new file mode 100644
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index 0000000..62c5825
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--- /dev/null
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+++ b/benchtests/bench-wcscpy.c
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@@ -0,0 +1,20 @@
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+/* Measure wcscpy functions.
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+   Copyright (C) 2015 Free Software Foundation, Inc.
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+   This file is part of the GNU C Library.
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+
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+   The GNU C Library is free software; you can redistribute it and/or
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+   modify it under the terms of the GNU Lesser General Public
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+   License as published by the Free Software Foundation; either
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+   version 2.1 of the License, or (at your option) any later version.
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+
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+   The GNU C Library is distributed in the hope that it will be useful,
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+   but WITHOUT ANY WARRANTY; without even the implied warranty of
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+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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+   Lesser General Public License for more details.
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+
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+   You should have received a copy of the GNU Lesser General Public
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+   License along with the GNU C Library; if not, see
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+   <http://www.gnu.org/licenses/>.  */
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+
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+#define WIDE 1
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+#include "bench-strcpy.c"
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diff --git a/sysdeps/s390/multiarch/Makefile b/sysdeps/s390/multiarch/Makefile
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index 3397f24..e2202b7 100644
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--- a/sysdeps/s390/multiarch/Makefile
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+++ b/sysdeps/s390/multiarch/Makefile
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@@ -1,9 +1,11 @@
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 ifeq ($(subdir),string)
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 sysdep_routines += strlen strlen-vx strlen-c \
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-		   strnlen strnlen-vx strnlen-c
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+		   strnlen strnlen-vx strnlen-c \
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+		   strcpy strcpy-vx
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 endif
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 ifeq ($(subdir),wcsmbs)
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 sysdep_routines += wcslen wcslen-vx wcslen-c \
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-		   wcsnlen wcsnlen-vx wcsnlen-c
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+		   wcsnlen wcsnlen-vx wcsnlen-c \
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+		   wcscpy wcscpy-vx wcscpy-c
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 endif
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diff --git a/sysdeps/s390/multiarch/ifunc-impl-list.c b/sysdeps/s390/multiarch/ifunc-impl-list.c
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index bc17c59..c9228d6 100644
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--- a/sysdeps/s390/multiarch/ifunc-impl-list.c
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+++ b/sysdeps/s390/multiarch/ifunc-impl-list.c
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@@ -85,6 +85,9 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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   IFUNC_VX_IMPL (strnlen);
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   IFUNC_VX_IMPL (wcsnlen);
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+  IFUNC_VX_IMPL (strcpy);
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+  IFUNC_VX_IMPL (wcscpy);
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+
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 #endif /* HAVE_S390_VX_ASM_SUPPORT */
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   return i;
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diff --git a/sysdeps/s390/multiarch/strcpy-vx.S b/sysdeps/s390/multiarch/strcpy-vx.S
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new file mode 100644
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index 0000000..a8243b0
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--- /dev/null
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+++ b/sysdeps/s390/multiarch/strcpy-vx.S
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@@ -0,0 +1,109 @@
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+/* Vector optimized 32/64 bit S/390 version of strcpy.
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+   Copyright (C) 2015 Free Software Foundation, Inc.
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+   This file is part of the GNU C Library.
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+
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+   The GNU C Library is free software; you can redistribute it and/or
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+   modify it under the terms of the GNU Lesser General Public
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+   License as published by the Free Software Foundation; either
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+   version 2.1 of the License, or (at your option) any later version.
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+
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+   The GNU C Library is distributed in the hope that it will be useful,
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+   but WITHOUT ANY WARRANTY; without even the implied warranty of
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+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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+   Lesser General Public License for more details.
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+
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+   You should have received a copy of the GNU Lesser General Public
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+   License along with the GNU C Library; if not, see
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+   <http://www.gnu.org/licenses/>.  */
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+
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+#if defined HAVE_S390_VX_ASM_SUPPORT && !defined NOT_IN_libc
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+
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+# include "sysdep.h"
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+# include "asm-syntax.h"
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+
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+	.text
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+
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+/* char * strcpy (const char *dest, const char *src)
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+   Copy string src to dest.
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+
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+   Register usage:
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+   -r1=tmp
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+   -r2=dest and return_value
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+   -r3=src
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+   -r4=tmp
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+   -r5=current_len
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+   -v16=part of src
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+   -v17=index of zero
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+   -v18=part of src
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+*/
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+ENTRY(__strcpy_vx)
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+	.machine "z13"
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+	.machinemode "zarch_nohighgprs"
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+
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+	vlbb	%v16,0(%r3),6	/* Load s until next 4k-byte boundary.  */
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+	lcbb	%r1,0(%r3),6	/* Get bytes to 4k-byte boundary or 16.  */
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+
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+	vfenezb	%v17,%v16,%v16	/* Find element not equal with zero search.  */
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+	vlgvb	%r5,%v17,7	/* Load zero index or 16 if not found.  */
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+	clrjl	%r5,%r1,.Lfound_align /* If found zero within loaded bytes,
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+					 copy bytes before and return.  */
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+
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+	/* Align s to 16 byte.  */
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+	risbgn	%r4,%r3,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15.  */
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+	lghi	%r5,15		/* current_len = 15.  */
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+	slr	%r5,%r4		/* Compute highest index to 16byte boundary.  */
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+
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+	vstl	%v16,%r5,0(%r2)	/* Copy loaded characters - no zero.  */
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+	ahi	%r5,1		/* Start loop at next character.  */
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+
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+	/* Find zero in 16byte aligned loop.  */
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+.Lloop:
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+	vl	%v16,0(%r5,%r3)	/* Load s.  */
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+	vfenezbs %v17,%v16,%v16	/* Find element not equal with zero search.  */
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+	je	.Lfound_v16_0	/* Jump away if zero was found.  */
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+	vl	%v18,16(%r5,%r3)/* Load next part of s.  */
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+	vst	%v16,0(%r5,%r2)	/* Store previous part without zero to dst.  */
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+	vfenezbs %v17,%v18,%v18
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+	je	.Lfound_v18_16
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+	vl	%v16,32(%r5,%r3)
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+	vst	%v18,16(%r5,%r2)
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+	vfenezbs %v17,%v16,%v16
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+	je	.Lfound_v16_32
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+	vl	%v18,48(%r5,%r3)
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+	vst	%v16,32(%r5,%r2)
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+	vfenezbs %v17,%v18,%v18
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+	je	.Lfound_v18_48
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+	vst	%v18,48(%r5,%r2)
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+
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+	aghi	%r5,64
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+	j	.Lloop	/* No zero found -> loop.  */
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+
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+.Lfound_v16_32:
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+	aghi	%r5,32
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+.Lfound_v16_0:
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+	la	%r3,0(%r5,%r2)
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+	vlgvb	%r4,%v17,7	/* Load byte index of zero.  */
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+	vstl	%v16,%r4,0(%r3)	/* Store characters including zero.  */
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+	br	%r14
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+
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+.Lfound_v18_48:
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+	aghi	%r5,32
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+.Lfound_v18_16:
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+	la	%r3,16(%r5,%r2)
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+	vlgvb	%r4,%v17,7	/* Load byte index of zero.  */
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+	vstl	%v18,%r4,0(%r3)	/* Store characters including zero.  */
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+	br	%r14
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+
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+.Lfound_align:
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+	vstl	%v16,%r5,0(%r2)	/* Copy characters including zero.  */
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+	br	%r14
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+END(__strcpy_vx)
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+
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+/* Use mvst-strcpy-implementation as default implementation.  */
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+# define strcpy __strcpy_c
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+# undef libc_hidden_builtin_def
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+# define libc_hidden_builtin_def(name) strong_alias(__strcpy_c, __GI_strcpy)
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+#endif /* HAVE_S390_VX_ASM_SUPPORT && !defined NOT_IN_libc */
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+
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+/* Include mvst-strcpy-implementation in s390-32/s390-64 subdirectory.  */
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+#include <strcpy.S>
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diff --git a/sysdeps/s390/multiarch/strcpy.c b/sysdeps/s390/multiarch/strcpy.c
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new file mode 100644
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index 0000000..2e00ddf
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--- /dev/null
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+++ b/sysdeps/s390/multiarch/strcpy.c
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@@ -0,0 +1,24 @@
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+/* Multiple versions of strcpy.
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+   Copyright (C) 2015 Free Software Foundation, Inc.
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+   This file is part of the GNU C Library.
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+
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+   The GNU C Library is free software; you can redistribute it and/or
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+   modify it under the terms of the GNU Lesser General Public
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+   License as published by the Free Software Foundation; either
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+   version 2.1 of the License, or (at your option) any later version.
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+
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+   The GNU C Library is distributed in the hope that it will be useful,
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+   but WITHOUT ANY WARRANTY; without even the implied warranty of
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+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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+   Lesser General Public License for more details.
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+
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+   You should have received a copy of the GNU Lesser General Public
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+   License along with the GNU C Library; if not, see
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+   <http://www.gnu.org/licenses/>.  */
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+
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+#if defined HAVE_S390_VX_ASM_SUPPORT && !defined NOT_IN_libc
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+# include <string.h>
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+# include <ifunc-resolve.h>
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+
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+s390_vx_libc_ifunc2 (__strcpy, strcpy)
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+#endif
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diff --git a/sysdeps/s390/multiarch/wcscpy-c.c b/sysdeps/s390/multiarch/wcscpy-c.c
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new file mode 100644
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index 0000000..ca219dd
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--- /dev/null
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+++ b/sysdeps/s390/multiarch/wcscpy-c.c
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@@ -0,0 +1,25 @@
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+/* Default wcscpy implementation for S/390.
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+   Copyright (C) 2015 Free Software Foundation, Inc.
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+   This file is part of the GNU C Library.
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+
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+   The GNU C Library is free software; you can redistribute it and/or
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+   modify it under the terms of the GNU Lesser General Public
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+   License as published by the Free Software Foundation; either
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+   version 2.1 of the License, or (at your option) any later version.
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+
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+   The GNU C Library is distributed in the hope that it will be useful,
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+   but WITHOUT ANY WARRANTY; without even the implied warranty of
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+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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+   Lesser General Public License for more details.
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+
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+   You should have received a copy of the GNU Lesser General Public
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+   License along with the GNU C Library; if not, see
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+   <http://www.gnu.org/licenses/>.  */
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+
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+#if defined HAVE_S390_VX_ASM_SUPPORT && !defined NOT_IN_libc
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+# define WCSCPY  __wcscpy_c
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+
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+# include <wchar.h>
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+extern __typeof (wcscpy) __wcscpy_c;
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+# include <wcsmbs/wcscpy.c>
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+#endif
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diff --git a/sysdeps/s390/multiarch/wcscpy-vx.S b/sysdeps/s390/multiarch/wcscpy-vx.S
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new file mode 100644
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index 0000000..6ec10bf
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--- /dev/null
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+++ b/sysdeps/s390/multiarch/wcscpy-vx.S
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@@ -0,0 +1,111 @@
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+/* Vector optimized 32/64 bit S/390 version of wcscpy.
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+   Copyright (C) 2015 Free Software Foundation, Inc.
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+   This file is part of the GNU C Library.
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+
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+   The GNU C Library is free software; you can redistribute it and/or
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+   modify it under the terms of the GNU Lesser General Public
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+   License as published by the Free Software Foundation; either
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+   version 2.1 of the License, or (at your option) any later version.
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+
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+   The GNU C Library is distributed in the hope that it will be useful,
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+   but WITHOUT ANY WARRANTY; without even the implied warranty of
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+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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+   Lesser General Public License for more details.
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+
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+   You should have received a copy of the GNU Lesser General Public
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+   License along with the GNU C Library; if not, see
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+   <http://www.gnu.org/licenses/>.  */
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+
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+#if defined HAVE_S390_VX_ASM_SUPPORT && !defined NOT_IN_libc
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+
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+# include "sysdep.h"
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+# include "asm-syntax.h"
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+
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+	.text
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+
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+/* char * wcscpy (const wchar_t *dest, const wchar_t *src)
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+   Copy string src to dest.
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+
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+   Register usage:
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+   -r0=border-len for switching to vector-instructions
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+   -r1=tmp
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+   -r2=dest and return value
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+   -r3=src
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+   -r4=tmp
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+   -r5=current_len
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+   -v16=part of src
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+   -v17=index of zero
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+   -v18=part of src
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+*/
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+ENTRY(__wcscpy_vx)
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+	.machine "z13"
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+	.machinemode "zarch_nohighgprs"
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+
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+	vlbb	%v16,0(%r3),6	/* Load s until next 4k-byte boundary.  */
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+	lcbb	%r1,0(%r3),6	/* Get bytes to 4k-byte boundary or 16.  */
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+
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+	tmll	%r3,3		/* Test if s is 4-byte aligned?  */
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+	jne	.Lfallback	/* And use common-code variant if not.  */
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+
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+	vfenezf	%v17,%v16,%v16	/* Find element not equal with zero search.  */
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+	vlgvb	%r5,%v17,7	/* Load zero index or 16 if not found.  */
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+	clrjl	%r5,%r1,.Lfound_align /* If found zero within loaded bytes,
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+					 copy bytes before and return.  */
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+
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+	/* Align s to 16 byte.  */
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+	risbgn	%r4,%r3,60,128+63,0 /* %r3 = bits 60-63 of %r2 'and' 15.  */
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+	lghi	%r5,15		/* current_len = 15.  */
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+	slr	%r5,%r4		/* Compute highest index to 16byte boundary.  */
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+
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+	vstl	%v16,%r5,0(%r2)	/* Copy loaded characters - no zero.  */
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+	ahi	%r5,1		/* Start loop at next character.  */
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+
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+	/* Find zero in 16byte aligned loop.  */
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+.Lloop:
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+	vl	%v16,0(%r5,%r3)	/* Load s.  */
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+	vfenezfs %v17,%v16,%v16	/* Find element not equal with zero search.  */
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+	je	.Lfound_v16_0	/* Jump away if zero was found.  */
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+	vl	%v18,16(%r5,%r3) /* Load next part of s.  */
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+	vst	%v16,0(%r5,%r2)	/* Store previous part without zero to dst.  */
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+	vfenezfs %v17,%v18,%v18
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+	je	.Lfound_v18_16
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+	vl	%v16,32(%r5,%r3)
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+	vst	%v18,16(%r5,%r2)
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+	vfenezfs %v17,%v16,%v16
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+	je	.Lfound_v16_32
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+	vl	%v18,48(%r5,%r3)
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+	vst	%v16,32(%r5,%r2)
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+	vfenezfs %v17,%v18,%v18
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+	je	.Lfound_v18_48
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+	vst	%v18,48(%r5,%r2)
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+
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+	aghi	%r5,64
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+	j	.Lloop		/* No zero found -> loop.  */
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+
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+.Lfound_v16_32:
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+	aghi	%r5,32
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+.Lfound_v16_0:
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+	la	%r3,0(%r5,%r2)
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+	vlgvb	%r1,%v17,7	/* Load byte index of zero.  */
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+	aghi	%r1,3		/* Also copy remaining bytes of zero.  */
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+	vstl	%v16,%r1,0(%r3)	/* Copy characters including zero.  */
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+	br	%r14
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+
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+.Lfound_v18_48:
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+	aghi	%r5,32
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+.Lfound_v18_16:
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+	la	%r3,16(%r5,%r2)
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+	vlgvb	%r1,%v17,7	/* Load byte index of zero.  */
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+	aghi	%r1,3		/* Also copy remaining bytes of zero.  */
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+	vstl	%v18,%r1,0(%r3)	/* Copy characters including zero.  */
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+	br	%r14
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+
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+.Lfound_align:
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+	aghi	%r5,3		/* Also copy remaining bytes of zero.  */
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+	vstl	%v16,%r5,0(%r2)	/* Copy characters including zero.  */
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+	br	%r14
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+
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+.Lfallback:
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+	jg	__wcscpy_c
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+END(__wcscpy_vx)
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+#endif /* HAVE_S390_VX_ASM_SUPPORT && !defined NOT_IN_libc */
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diff --git a/sysdeps/s390/multiarch/wcscpy.c b/sysdeps/s390/multiarch/wcscpy.c
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new file mode 100644
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index 0000000..b3a057a
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--- /dev/null
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+++ b/sysdeps/s390/multiarch/wcscpy.c
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@@ -0,0 +1,27 @@
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+/* Multiple versions of wcscpy.
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+   Copyright (C) 2015 Free Software Foundation, Inc.
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+   This file is part of the GNU C Library.
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+
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+   The GNU C Library is free software; you can redistribute it and/or
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+   modify it under the terms of the GNU Lesser General Public
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+   License as published by the Free Software Foundation; either
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+   version 2.1 of the License, or (at your option) any later version.
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+
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+   The GNU C Library is distributed in the hope that it will be useful,
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+   but WITHOUT ANY WARRANTY; without even the implied warranty of
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+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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+   Lesser General Public License for more details.
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+
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+   You should have received a copy of the GNU Lesser General Public
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+   License along with the GNU C Library; if not, see
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+   <http://www.gnu.org/licenses/>.  */
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+
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+#if defined HAVE_S390_VX_ASM_SUPPORT && !defined NOT_IN_libc
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+# include <wchar.h>
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+# include <ifunc-resolve.h>
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+
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+s390_vx_libc_ifunc2 (__wcscpy, wcscpy)
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+
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+#else
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+# include <wcsmbs/wcscpy.c>
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+#endif /* !(defined HAVE_S390_VX_ASM_SUPPORT && !defined NOT_IN_libc) */
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diff --git a/sysdeps/s390/s390-32/multiarch/strcpy.c b/sysdeps/s390/s390-32/multiarch/strcpy.c
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new file mode 100644
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index 0000000..b02c392
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--- /dev/null
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+++ b/sysdeps/s390/s390-32/multiarch/strcpy.c
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@@ -0,0 +1,21 @@
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+/* Multiple versions of strcpy.
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+   Copyright (C) 2015 Free Software Foundation, Inc.
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+   This file is part of the GNU C Library.
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+
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+   The GNU C Library is free software; you can redistribute it and/or
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+   modify it under the terms of the GNU Lesser General Public
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+   License as published by the Free Software Foundation; either
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+   version 2.1 of the License, or (at your option) any later version.
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+
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+   The GNU C Library is distributed in the hope that it will be useful,
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+   but WITHOUT ANY WARRANTY; without even the implied warranty of
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+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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+   Lesser General Public License for more details.
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+
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+   You should have received a copy of the GNU Lesser General Public
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+   License along with the GNU C Library; if not, see
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+   <http://www.gnu.org/licenses/>.  */
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+
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+/* This wrapper-file is needed, because otherwise file
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+   sysdeps/s390/s390-[32|64]/strcpy.S will be used.  */
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+#include <sysdeps/s390/multiarch/strcpy.c>
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diff --git a/sysdeps/s390/s390-64/multiarch/strcpy.c b/sysdeps/s390/s390-64/multiarch/strcpy.c
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new file mode 100644
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index 0000000..b02c392
ce426f
--- /dev/null
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+++ b/sysdeps/s390/s390-64/multiarch/strcpy.c
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@@ -0,0 +1,21 @@
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+/* Multiple versions of strcpy.
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+   Copyright (C) 2015 Free Software Foundation, Inc.
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+   This file is part of the GNU C Library.
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+
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+   The GNU C Library is free software; you can redistribute it and/or
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+   modify it under the terms of the GNU Lesser General Public
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+   License as published by the Free Software Foundation; either
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+   version 2.1 of the License, or (at your option) any later version.
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+
ce426f
+   The GNU C Library is distributed in the hope that it will be useful,
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+   but WITHOUT ANY WARRANTY; without even the implied warranty of
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+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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+   Lesser General Public License for more details.
ce426f
+
ce426f
+   You should have received a copy of the GNU Lesser General Public
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+   License along with the GNU C Library; if not, see
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+   <http://www.gnu.org/licenses/>.  */
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+
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+/* This wrapper-file is needed, because otherwise file
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+   sysdeps/s390/s390-[32|64]/strcpy.S will be used.  */
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+#include <sysdeps/s390/multiarch/strcpy.c>
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-- 
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2.3.0
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