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glibc
0007-powerpc-Add-optimized-stpncpy-for-POWER9.p...
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File 0007-powerpc-Add-optimized-stpncpy-for-POWER9.patch of Package glibc
From 7beee7b39adeda657f45989b0635033dae25a1fd Mon Sep 17 00:00:00 2001 From: Raphael M Zinsly <rzinsly@linux.ibm.com> Date: Thu, 12 Nov 2020 13:12:24 -0300 Subject: [PATCH] powerpc: Add optimized stpncpy for POWER9 Add stpncpy support into the POWER9 strncpy. Reviewed-by: Matheus Castanho <msc@linux.ibm.com> Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com> --- sysdeps/powerpc/powerpc64/le/power9/stpncpy.S | 24 +++++++ sysdeps/powerpc/powerpc64/le/power9/strncpy.S | 68 ++++++++++++++++++- sysdeps/powerpc/powerpc64/multiarch/Makefile | 2 +- .../powerpc64/multiarch/ifunc-impl-list.c | 6 ++ .../powerpc64/multiarch/stpncpy-power9.S | 29 ++++++++ sysdeps/powerpc/powerpc64/multiarch/stpncpy.c | 8 +++ 6 files changed, 135 insertions(+), 2 deletions(-) create mode 100644 sysdeps/powerpc/powerpc64/le/power9/stpncpy.S create mode 100644 sysdeps/powerpc/powerpc64/multiarch/stpncpy-power9.S diff --git a/sysdeps/powerpc/powerpc64/le/power9/stpncpy.S b/sysdeps/powerpc/powerpc64/le/power9/stpncpy.S new file mode 100644 index 0000000000..81d9673d8b --- /dev/null +++ b/sysdeps/powerpc/powerpc64/le/power9/stpncpy.S @@ -0,0 +1,24 @@ +/* Optimized stpncpy implementation for POWER9 LE. + 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/>. */ + +#define USE_AS_STPNCPY +#include <sysdeps/powerpc/powerpc64/le/power9/strncpy.S> + +weak_alias (__stpncpy, stpncpy) +libc_hidden_def (__stpncpy) +libc_hidden_builtin_def (stpncpy) diff --git a/sysdeps/powerpc/powerpc64/le/power9/strncpy.S b/sysdeps/powerpc/powerpc64/le/power9/strncpy.S index cbfc37bda3..b4ba428662 100644 --- a/sysdeps/powerpc/powerpc64/le/power9/strncpy.S +++ b/sysdeps/powerpc/powerpc64/le/power9/strncpy.S @@ -18,11 +18,19 @@ #include <sysdep.h> +#ifdef USE_AS_STPNCPY +# ifndef STPNCPY +# define FUNC_NAME __stpncpy +# else +# define FUNC_NAME STPNCPY +# endif +#else # ifndef STRNCPY # define FUNC_NAME strncpy # else # define FUNC_NAME STRNCPY # endif +#endif /* !USE_AS_STPNCPY */ #ifndef MEMSET /* For builds without IFUNC support, local calls should be made to internal @@ -41,6 +49,12 @@ char * [r3] strncpy (char *dest [r3], const char *src [r4], size_t n [r5]) + or + + char * [r3] stpncpy (char *dest [r3], const char *src [r4], size_t n [r5]) + + if USE_AS_STPNCPY is defined. + The implementation can load bytes past a null terminator, but only up to the next 16-byte aligned address, so it never crosses a page. */ @@ -66,7 +80,15 @@ ENTRY (FUNC_NAME, 4) /* Empty/1-byte string optimization */ cmpdi r5,0 +#ifdef USE_AS_STPNCPY + bgt L(cont) + /* Compute pointer to last byte copied into dest. */ + addi r3,r3,1 + blr +L(cont): +#else beqlr +#endif addi r4,r4,1 neg r7,r4 @@ -96,12 +118,20 @@ ENTRY (FUNC_NAME, 4) sldi r10,r5,56 /* stxvl wants size in top 8 bits */ stxvl 32+v0,r11,r10 /* Partial store */ +#ifdef USE_AS_STPNCPY + /* Compute pointer to last byte copied into dest. */ + add r3,r11,r5 +#endif blr L(null): sldi r10,r8,56 /* stxvl wants size in top 8 bits */ stxvl 32+v0,r11,r10 /* Partial store */ +#ifdef USE_AS_STPNCPY + /* Compute pointer to last byte copied into dest. */ + add r3,r11,r7 +#endif add r11,r11,r8 sub r5,r5,r8 b L(zero_padding) @@ -185,6 +215,10 @@ L(n_tail4): sldi r10,r5,56 /* stxvl wants size in top 8 bits */ addi r11,r11,48 /* Offset */ stxvl 32+v3,r11,r10 /* Partial store */ +#ifdef USE_AS_STPNCPY + /* Compute pointer to last byte copied into dest. */ + add r3,r11,r5 +#endif blr L(prep_n_tail1): @@ -196,6 +230,10 @@ L(prep_n_tail1): L(n_tail1): sldi r10,r5,56 /* stxvl wants size in top 8 bits */ stxvl 32+v0,r11,r10 /* Partial store */ +#ifdef USE_AS_STPNCPY + /* Compute pointer to last byte copied into dest. */ + add r3,r11,r5 +#endif blr L(prep_n_tail2): @@ -209,6 +247,10 @@ L(n_tail2): sldi r10,r5,56 /* stxvl wants size in top 8 bits */ addi r11,r11,16 /* offset */ stxvl 32+v1,r11,r10 /* Partial store */ +#ifdef USE_AS_STPNCPY + /* Compute pointer to last byte copied into dest. */ + add r3,r11,r5 +#endif blr L(prep_n_tail3): @@ -223,6 +265,10 @@ L(n_tail3): sldi r10,r5,56 /* stxvl wants size in top 8 bits */ addi r11,r11,32 /* Offset */ stxvl 32+v2,r11,r10 /* Partial store */ +#ifdef USE_AS_STPNCPY + /* Compute pointer to last byte copied into dest. */ + add r3,r11,r5 +#endif blr L(prep_tail1): @@ -232,6 +278,10 @@ L(tail1): addi r9,r8,1 /* Add null terminator */ sldi r10,r9,56 /* stxvl wants size in top 8 bits */ stxvl 32+v0,r11,r10 /* Partial store */ +#ifdef USE_AS_STPNCPY + /* Compute pointer to last byte copied into dest. */ + add r3,r11,r8 +#endif add r11,r11,r9 sub r5,r5,r9 b L(zero_padding) @@ -246,6 +296,10 @@ L(tail2): sldi r10,r9,56 /* stxvl wants size in top 8 bits */ addi r11,r11,16 /* offset */ stxvl 32+v1,r11,r10 /* Partial store */ +#ifdef USE_AS_STPNCPY + /* Compute pointer to last byte copied into dest. */ + add r3,r11,r8 +#endif add r11,r11,r9 sub r5,r5,r9 b L(zero_padding) @@ -261,6 +315,10 @@ L(tail3): sldi r10,r9,56 /* stxvl wants size in top 8 bits */ addi r11,r11,32 /* offset */ stxvl 32+v2,r11,r10 /* Partial store */ +#ifdef USE_AS_STPNCPY + /* Compute pointer to last byte copied into dest. */ + add r3,r11,r8 +#endif add r11,r11,r9 sub r5,r5,r9 b L(zero_padding) @@ -276,6 +334,10 @@ L(tail4): sldi r10,r9,56 /* stxvl wants size in top 8 bits */ addi r11,r11,48 /* offset */ stxvl 32+v3,r11,r10 /* Partial store */ +#ifdef USE_AS_STPNCPY + /* Compute pointer to last byte copied into dest. */ + add r3,r11,r8 +#endif add r11,r11,r9 sub r5,r5,r9 @@ -331,7 +393,8 @@ L(zero_padding_memset): ld r0,FRAMESIZE+16(r1) mr r3,r30 /* Restore the return value of strncpy, i.e.: - dest. */ + dest. For stpncpy, the return value is the + same as return value of memset. */ ld r30,FRAMESIZE-8(r1) /* Restore r30. */ /* Restore the stack frame. */ addi r1,r1,FRAMESIZE @@ -342,3 +405,6 @@ L(zero_padding_memset): blr END (FUNC_NAME) +#ifndef USE_AS_STPNCPY +libc_hidden_builtin_def (strncpy) +#endif diff --git a/sysdeps/powerpc/powerpc64/multiarch/Makefile b/sysdeps/powerpc/powerpc64/multiarch/Makefile index cd2b47b403..f46bf50732 100644 --- a/sysdeps/powerpc/powerpc64/multiarch/Makefile +++ b/sysdeps/powerpc/powerpc64/multiarch/Makefile @@ -33,7 +33,7 @@ sysdep_routines += memcpy-power8-cached memcpy-power7 memcpy-a2 memcpy-power6 \ ifneq (,$(filter %le,$(config-machine))) sysdep_routines += strcmp-power9 strncmp-power9 strcpy-power9 stpcpy-power9 \ - rawmemchr-power9 strlen-power9 strncpy-power9 + rawmemchr-power9 strlen-power9 strncpy-power9 stpncpy-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 135326c97a..8e19ebbf09 100644 --- a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c +++ b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c @@ -318,6 +318,12 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array, /* Support sysdeps/powerpc/powerpc64/multiarch/stpncpy.c. */ IFUNC_IMPL (i, name, stpncpy, +#ifdef __LITTLE_ENDIAN__ + IFUNC_IMPL_ADD (array, i, stpncpy, + (hwcap2 & PPC_FEATURE2_ARCH_3_00) + && (hwcap & PPC_FEATURE_HAS_VSX), + __stpncpy_power9) +#endif IFUNC_IMPL_ADD (array, i, stpncpy, hwcap2 & PPC_FEATURE2_ARCH_2_07, __stpncpy_power8) diff --git a/sysdeps/powerpc/powerpc64/multiarch/stpncpy-power9.S b/sysdeps/powerpc/powerpc64/multiarch/stpncpy-power9.S new file mode 100644 index 0000000000..1188bd0894 --- /dev/null +++ b/sysdeps/powerpc/powerpc64/multiarch/stpncpy-power9.S @@ -0,0 +1,29 @@ +/* Optimized stpncpy implementation for POWER9 LE. + 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/>. */ + +#define STPNCPY __stpncpy_power9 + +#undef libc_hidden_builtin_def +#define libc_hidden_builtin_def(name) + +#define MEMSET __memset_power8 +#ifdef SHARED +# define MEMSET_is_local +#endif + +#include <sysdeps/powerpc/powerpc64/le/power9/stpncpy.S> diff --git a/sysdeps/powerpc/powerpc64/multiarch/stpncpy.c b/sysdeps/powerpc/powerpc64/multiarch/stpncpy.c index 17df886431..3758f29ad1 100644 --- a/sysdeps/powerpc/powerpc64/multiarch/stpncpy.c +++ b/sysdeps/powerpc/powerpc64/multiarch/stpncpy.c @@ -26,10 +26,18 @@ extern __typeof (__stpncpy) __stpncpy_ppc attribute_hidden; extern __typeof (__stpncpy) __stpncpy_power7 attribute_hidden; extern __typeof (__stpncpy) __stpncpy_power8 attribute_hidden; +# ifdef __LITTLE_ENDIAN__ +extern __typeof (__stpncpy) __stpncpy_power9 attribute_hidden; +# endif # undef stpncpy # undef __stpncpy libc_ifunc_redirected (__redirect___stpncpy, __stpncpy, +# ifdef __LITTLE_ENDIAN__ + (hwcap2 & PPC_FEATURE2_ARCH_3_00) && + (hwcap & PPC_FEATURE_HAS_VSX) + ? __stpncpy_power9 : +# endif (hwcap2 & PPC_FEATURE2_ARCH_2_07) ? __stpncpy_power8 : (hwcap & PPC_FEATURE_HAS_VSX) -- 2.34.1
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