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glibc/SOURCES/glibc-rh1871387-2.patch

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commit 39037048502d52ab6422c18f2d178d6228d2c7b9
Author: Anton Blanchard via Libc-alpha <libc-alpha@sourceware.org>
Date: Thu May 14 09:00:26 2020 +1000
powerpc: Optimized strcpy for POWER9
This version uses VSX store vector with length instructions and is
significantly faster on small strings and relatively unaligned large
strings, compared to the POWER8 version. A few examples:
__strcpy_power9 __strcpy_power8
Length 16, alignments in bytes 0/ 0: 2.52454 4.62695
Length 412, alignments in bytes 4/ 0: 11.6 22.9185
diff --git a/sysdeps/powerpc/powerpc64/le/power9/strcpy.S b/sysdeps/powerpc/powerpc64/le/power9/strcpy.S
new file mode 100644
index 0000000000000000..5749228054667b2d
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/le/power9/strcpy.S
@@ -0,0 +1,144 @@
+/* Optimized strcpy implementation for PowerPC64/POWER9.
+ Copyright (C) 2020 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
+ <https://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+
+#ifndef STRCPY
+# define STRCPY strcpy
+#endif
+
+/* Implements the function
+
+ char * [r3] strcpy (char *dest [r3], const char *src [r4])
+
+ The implementation can load bytes past a null terminator, but only
+ up to the next 16B boundary, so it never crosses a page. */
+
+.machine power9
+ENTRY_TOCLESS (STRCPY, 4)
+ CALL_MCOUNT 2
+
+ /* NULL string optimisation */
+ lbz r0,0(r4)
+ stb r0,0(r3)
+ cmpwi r0,0
+ beqlr
+
+ addi r4,r4,1
+ addi r11,r3,1
+
+ vspltisb v18,0 /* Zeroes in v18 */
+
+ neg r5,r4
+ rldicl r9,r5,0,60 /* How many bytes to get source 16B aligned? */
+
+ /* Get source 16B aligned */
+ lvx v0,0,r4
+ lvsr v1,0,r4
+ vperm v0,v18,v0,v1
+
+ vcmpequb v6,v0,v18 /* 0xff if byte is NULL, 0x00 otherwise */
+ vctzlsbb r8,v6 /* Number of trailing zeroes */
+ addi r8,r8,1 /* Add null terminator */
+
+ /* r8 = bytes including null
+ r9 = bytes to get source 16B aligned
+ if r8 > r9
+ no null, copy r9 bytes
+ else
+ there is a null, copy r8 bytes and return. */
+ cmpd r8,r9
+ bgt L(no_null)
+
+ sldi r10,r8,56 /* stxvl wants size in top 8 bits */
+ stxvl 32+v0,r11,r10 /* Partial store */
+
+ blr
+
+L(no_null):
+ sldi r10,r9,56 /* stxvl wants size in top 8 bits */
+ stxvl 32+v0,r11,r10 /* Partial store */
+
+ add r4,r4,r9
+ add r11,r11,r9
+
+L(loop):
+ lxv 32+v0,0(r4)
+ vcmpequb. v6,v0,v18 /* Any zero bytes? */
+ bne cr6,L(tail1)
+
+ lxv 32+v1,16(r4)
+ vcmpequb. v6,v1,v18 /* Any zero bytes? */
+ bne cr6,L(tail2)
+
+ lxv 32+v2,32(r4)
+ vcmpequb. v6,v2,v18 /* Any zero bytes? */
+ bne cr6,L(tail3)
+
+ lxv 32+v3,48(r4)
+ vcmpequb. v6,v3,v18 /* Any zero bytes? */
+ bne cr6,L(tail4)
+
+ stxv 32+v0,0(r11)
+ stxv 32+v1,16(r11)
+ stxv 32+v2,32(r11)
+ stxv 32+v3,48(r11)
+
+ addi r4,r4,64
+ addi r11,r11,64
+
+ b L(loop)
+
+L(tail1):
+ vctzlsbb r8,v6
+ addi r8,r8,1
+ sldi r9,r8,56 /* stxvl wants size in top 8 bits */
+ stxvl 32+v0,r11,r9
+ blr
+
+L(tail2):
+ stxv 32+v0,0(r11)
+ vctzlsbb r8,v6 /* Number of trailing zeroes */
+ addi r8,r8,1 /* Add null terminator */
+ sldi r10,r8,56 /* stxvl wants size in top 8 bits */
+ addi r11,r11,16
+ stxvl 32+v1,r11,r10 /* Partial store */
+ blr
+
+L(tail3):
+ stxv 32+v0,0(r11)
+ stxv 32+v1,16(r11)
+ vctzlsbb r8,v6 /* Number of trailing zeroes */
+ addi r8,r8,1 /* Add null terminator */
+ sldi r10,r8,56 /* stxvl wants size in top 8 bits */
+ addi r11,r11,32
+ stxvl 32+v2,r11,r10 /* Partial store */
+ blr
+
+L(tail4):
+ stxv 32+v0,0(r11)
+ stxv 32+v1,16(r11)
+ stxv 32+v2,32(r11)
+ vctzlsbb r8,v6 /* Number of trailing zeroes */
+ addi r8,r8,1 /* Add null terminator */
+ sldi r10,r8,56 /* stxvl wants size in top 8 bits */
+ addi r11,r11,48
+ stxvl 32+v3,r11,r10 /* Partial store */
+ blr
+END (STRCPY)
+libc_hidden_builtin_def (strcpy)
diff --git a/sysdeps/powerpc/powerpc64/multiarch/Makefile b/sysdeps/powerpc/powerpc64/multiarch/Makefile
index 963ea84dbfa98c74..17057bcbd694a710 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/Makefile
+++ b/sysdeps/powerpc/powerpc64/multiarch/Makefile
@@ -32,7 +32,7 @@ sysdep_routines += memcpy-power8-cached memcpy-power7 memcpy-a2 memcpy-power6 \
strncase-power8
ifneq (,$(filter %le,$(config-machine)))
-sysdep_routines += strcmp-power9 strncmp-power9
+sysdep_routines += strcmp-power9 strncmp-power9 strcpy-power9
endif
CFLAGS-strncase-power7.c += -mcpu=power7 -funroll-loops
CFLAGS-strncase_l-power7.c += -mcpu=power7 -funroll-loops
diff --git a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
index 1d374f2ae48165bd..2857fa8f36599afd 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
+++ b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
@@ -85,6 +85,10 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
/* Support sysdeps/powerpc/powerpc64/multiarch/strcpy.c. */
IFUNC_IMPL (i, name, strcpy,
+#ifdef __LITTLE_ENDIAN__
+ IFUNC_IMPL_ADD (array, i, strcpy, hwcap2 & PPC_FEATURE2_ARCH_3_00,
+ __strcpy_power9)
+#endif
IFUNC_IMPL_ADD (array, i, strcpy, hwcap2 & PPC_FEATURE2_ARCH_2_07,
__strcpy_power8)
IFUNC_IMPL_ADD (array, i, strcpy, hwcap & PPC_FEATURE_HAS_VSX,
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strcpy-power9.S b/sysdeps/powerpc/powerpc64/multiarch/strcpy-power9.S
new file mode 100644
index 0000000000000000..d22aa0a8d690cad7
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/multiarch/strcpy-power9.S
@@ -0,0 +1,26 @@
+/* Optimized strcpy implementation for POWER9/PPC64.
+ Copyright (C) 2016-2020 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
+ <https://www.gnu.org/licenses/>. */
+
+#if defined __LITTLE_ENDIAN__ && IS_IN (libc)
+#define STRCPY __strcpy_power9
+
+#undef libc_hidden_builtin_def
+#define libc_hidden_builtin_def(name)
+
+#include <sysdeps/powerpc/powerpc64/le/power9/strcpy.S>
+#endif
diff --git a/sysdeps/powerpc/powerpc64/multiarch/strcpy.c b/sysdeps/powerpc/powerpc64/multiarch/strcpy.c
index b18a92a62a526d9c..88826392be4bdf48 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/strcpy.c
+++ b/sysdeps/powerpc/powerpc64/multiarch/strcpy.c
@@ -25,9 +25,16 @@
extern __typeof (strcpy) __strcpy_ppc attribute_hidden;
extern __typeof (strcpy) __strcpy_power7 attribute_hidden;
extern __typeof (strcpy) __strcpy_power8 attribute_hidden;
+# ifdef __LITTLE_ENDIAN__
+extern __typeof (strcpy) __strcpy_power9 attribute_hidden;
+# endif
#undef strcpy
libc_ifunc_redirected (__redirect_strcpy, strcpy,
+# ifdef __LITTLE_ENDIAN__
+ (hwcap2 & PPC_FEATURE2_ARCH_3_00)
+ ? __strcpy_power9 :
+# endif
(hwcap2 & PPC_FEATURE2_ARCH_2_07)
? __strcpy_power8
: (hwcap & PPC_FEATURE_HAS_VSX)
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