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