You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
246 lines
8.0 KiB
246 lines
8.0 KiB
9 months ago
|
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)
|