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glibc.24846
0001-powerpc-Optimized-strcpy-for-POWER9.patch
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File 0001-powerpc-Optimized-strcpy-for-POWER9.patch of Package glibc.24846
From 39037048502d52ab6422c18f2d178d6228d2c7b9 Mon Sep 17 00:00:00 2001 From: Anton Blanchard via Libc-alpha <libc-alpha@sourceware.org> Date: Thu, 14 May 2020 09:00:26 +1000 Subject: [PATCH] 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 --- sysdeps/powerpc/powerpc64/le/power9/strcpy.S | 144 ++++++++++++++++++ sysdeps/powerpc/powerpc64/multiarch/Makefile | 2 +- .../powerpc64/multiarch/ifunc-impl-list.c | 4 + .../powerpc64/multiarch/strcpy-power9.S | 26 ++++ sysdeps/powerpc/powerpc64/multiarch/strcpy.c | 7 + 5 files changed, 182 insertions(+), 1 deletion(-) create mode 100644 sysdeps/powerpc/powerpc64/le/power9/strcpy.S create mode 100644 sysdeps/powerpc/powerpc64/multiarch/strcpy-power9.S diff --git a/sysdeps/powerpc/powerpc64/le/power9/strcpy.S b/sysdeps/powerpc/powerpc64/le/power9/strcpy.S new file mode 100644 index 0000000000..5749228054 --- /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 ea936bf9ed..db11345053 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 b9fef3f43c..ad11ede20e 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 0000000000..d22aa0a8d6 --- /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 66ea93b8f4..dcdee5181f 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) -- 2.34.1
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