commit aa70d0563256b8ea053203177f756bca33b5cf37
Author: Anton Blanchard via Libc-alpha <libc-alpha@sourceware.org>
Date: Thu May 14 09:08:35 2020 +1000
powerpc: Optimized stpcpy for POWER9
Add stpcpy support to the POWER9 strcpy. This is up to 40% faster on
small strings and up to 90% faster on long relatively unaligned strings,
compared to the POWER8 version. A few examples:
__stpcpy_power9 __stpcpy_power8
Length 20, alignments in bytes 4/ 4: 2.58246 4.8788
Length 1024, alignments in bytes 1/ 6: 24.8186 47.8528
diff --git a/sysdeps/powerpc/powerpc64/le/power9/stpcpy.S b/sysdeps/powerpc/powerpc64/le/power9/stpcpy.S
new file mode 100644
index 0000000000000000..44425cb1e80ea198
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/le/power9/stpcpy.S
@@ -0,0 +1,24 @@
+/* Optimized stpcpy implementation for PowerPC64/POWER9.
+ Copyright (C) 2015-2020 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/>. */
+
+#define USE_AS_STPCPY
+#include <sysdeps/powerpc/powerpc64/le/power9/strcpy.S>
+
+weak_alias (__stpcpy, stpcpy)
+libc_hidden_def (__stpcpy)
+libc_hidden_builtin_def (stpcpy)
diff --git a/sysdeps/powerpc/powerpc64/le/power9/strcpy.S b/sysdeps/powerpc/powerpc64/le/power9/strcpy.S
index 5749228054667b2d..ce8f50329177fd06 100644
--- a/sysdeps/powerpc/powerpc64/le/power9/strcpy.S
+++ b/sysdeps/powerpc/powerpc64/le/power9/strcpy.S
@@ -18,19 +18,35 @@
#include <sysdep.h>
-#ifndef STRCPY
-# define STRCPY strcpy
-#endif
+#ifdef USE_AS_STPCPY
+# ifndef STPCPY
+# define FUNC_NAME __stpcpy
+# else
+# define FUNC_NAME STPCPY
+# endif
+#else
+# ifndef STRCPY
+# define FUNC_NAME strcpy
+# else
+# define FUNC_NAME STRCPY
+# endif
+#endif /* !USE_AS_STPCPY */
/* Implements the function
char * [r3] strcpy (char *dest [r3], const char *src [r4])
+ or
+
+ char * [r3] stpcpy (char *dest [r3], const char *src [r4])
+
+ if USE_AS_STPCPY is defined.
+
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)
+ENTRY_TOCLESS (FUNC_NAME, 4)
CALL_MCOUNT 2
/* NULL string optimisation */
@@ -53,8 +69,8 @@ ENTRY_TOCLESS (STRCPY, 4)
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 */
+ vctzlsbb r7,v6 /* Number of trailing zeroes */
+ addi r8,r7,1 /* Add null terminator */
/* r8 = bytes including null
r9 = bytes to get source 16B aligned
@@ -68,6 +84,11 @@ ENTRY_TOCLESS (STRCPY, 4)
sldi r10,r8,56 /* stxvl wants size in top 8 bits */
stxvl 32+v0,r11,r10 /* Partial store */
+#ifdef USE_AS_STPCPY
+ /* stpcpy returns the dest address plus the size not counting the
+ final '\0'. */
+ add r3,r11,r7
+#endif
blr
L(no_null):
@@ -106,28 +127,43 @@ L(loop):
L(tail1):
vctzlsbb r8,v6
- addi r8,r8,1
- sldi r9,r8,56 /* stxvl wants size in top 8 bits */
+ addi r9,r8,1
+ sldi r9,r9,56 /* stxvl wants size in top 8 bits */
stxvl 32+v0,r11,r9
+#ifdef USE_AS_STPCPY
+ /* stpcpy returns the dest address plus the size not counting the
+ final '\0'. */
+ add r3,r11,r8
+#endif
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 r9,r8,1 /* Add null terminator */
+ sldi r10,r9,56 /* stxvl wants size in top 8 bits */
addi r11,r11,16
stxvl 32+v1,r11,r10 /* Partial store */
+#ifdef USE_AS_STPCPY
+ /* stpcpy returns the dest address plus the size not counting the
+ final '\0'. */
+ add r3,r11,r8
+#endif
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 r9,r8,1 /* Add null terminator */
+ sldi r10,r9,56 /* stxvl wants size in top 8 bits */
addi r11,r11,32
stxvl 32+v2,r11,r10 /* Partial store */
+#ifdef USE_AS_STPCPY
+ /* stpcpy returns the dest address plus the size not counting the
+ final '\0'. */
+ add r3,r11,r8
+#endif
blr
L(tail4):
@@ -135,10 +171,17 @@ L(tail4):
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 r9,r8,1 /* Add null terminator */
+ sldi r10,r9,56 /* stxvl wants size in top 8 bits */
addi r11,r11,48
stxvl 32+v3,r11,r10 /* Partial store */
+#ifdef USE_AS_STPCPY
+ /* stpcpy returns the dest address plus the size not counting the
+ final '\0'. */
+ add r3,r11,r8
+#endif
blr
-END (STRCPY)
+END (FUNC_NAME)
+#ifndef USE_AS_STPCPY
libc_hidden_builtin_def (strcpy)
+#endif
diff --git a/sysdeps/powerpc/powerpc64/multiarch/Makefile b/sysdeps/powerpc/powerpc64/multiarch/Makefile
index 17057bcbd694a710..cada6b19bf3c8fab 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 strcpy-power9
+sysdep_routines += strcmp-power9 strncmp-power9 strcpy-power9 stpcpy-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 2857fa8f36599afd..b0abc6b61dc15f19 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
+++ b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
@@ -98,6 +98,10 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
/* Support sysdeps/powerpc/powerpc64/multiarch/stpcpy.c. */
IFUNC_IMPL (i, name, stpcpy,
+#ifdef __LITTLE_ENDIAN__
+ IFUNC_IMPL_ADD (array, i, strncmp, hwcap2 & PPC_FEATURE2_ARCH_3_00,
+ __stpcpy_power9)
+#endif
IFUNC_IMPL_ADD (array, i, stpcpy, hwcap2 & PPC_FEATURE2_ARCH_2_07,
__stpcpy_power8)
IFUNC_IMPL_ADD (array, i, stpcpy, hwcap & PPC_FEATURE_HAS_VSX,
diff --git a/sysdeps/powerpc/powerpc64/multiarch/stpcpy-power9.S b/sysdeps/powerpc/powerpc64/multiarch/stpcpy-power9.S
new file mode 100644
index 0000000000000000..a728d49fd2575e00
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/multiarch/stpcpy-power9.S
@@ -0,0 +1,24 @@
+/* Optimized stpcpy implementation for POWER9/PPC64.
+ Copyright (C) 2015-2020 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/>. */
+
+#define STPCPY __stpcpy_power9
+
+#undef libc_hidden_builtin_def
+#define libc_hidden_builtin_def(name)
+
+#include <sysdeps/powerpc/powerpc64/le/power9/stpcpy.S>
diff --git a/sysdeps/powerpc/powerpc64/multiarch/stpcpy.c b/sysdeps/powerpc/powerpc64/multiarch/stpcpy.c
index 34c889644133d757..8ce58572e0f27c7f 100644
--- a/sysdeps/powerpc/powerpc64/multiarch/stpcpy.c
+++ b/sysdeps/powerpc/powerpc64/multiarch/stpcpy.c
@@ -26,13 +26,20 @@
extern __typeof (__stpcpy) __stpcpy_ppc attribute_hidden;
extern __typeof (__stpcpy) __stpcpy_power7 attribute_hidden;
extern __typeof (__stpcpy) __stpcpy_power8 attribute_hidden;
+# ifdef __LITTLE_ENDIAN__
+extern __typeof (__stpcpy) __stpcpy_power9 attribute_hidden;
+# endif
libc_ifunc_hidden (__stpcpy, __stpcpy,
- (hwcap2 & PPC_FEATURE2_ARCH_2_07)
- ? __stpcpy_power8
- : (hwcap & PPC_FEATURE_HAS_VSX)
- ? __stpcpy_power7
- : __stpcpy_ppc);
+# ifdef __LITTLE_ENDIAN__
+ (hwcap2 & PPC_FEATURE2_ARCH_3_00)
+ ? __stpcpy_power9 :
+# endif
+ (hwcap2 & PPC_FEATURE2_ARCH_2_07)
+ ? __stpcpy_power8
+ : (hwcap & PPC_FEATURE_HAS_VSX)
+ ? __stpcpy_power7
+ : __stpcpy_ppc);
weak_alias (__stpcpy, stpcpy)
libc_hidden_def (__stpcpy)