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glibc.21693
0008-S390-Add-z13-memmove-ifunc-variant.patch
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File 0008-S390-Add-z13-memmove-ifunc-variant.patch of Package glibc.21693
From 9dcf8c206f6bbc79c52913904503a1b81e193b5a Mon Sep 17 00:00:00 2001 From: Stefan Liebler <stli@linux.ibm.com> Date: Tue, 18 Dec 2018 13:57:08 +0100 Subject: [PATCH 08/18] S390: Add z13 memmove ifunc variant. This patch introduces a z13 specific ifunc variant for memmove. As the common code implementation, it checks if we can copy from the beginning to the end - with z196 memcpy implementation - or if we have to copy from the end to the beginning. The latter case is done by using vector load/store instructions. If vector instructions are not available, the common-code is used as fallback. Therefore it is implemented in memmove-c with a different name. Furthermore the ifunc logic decides if we need the common-code implementation at all. If vector instructions are supported due to the minimum architecture level set we can skip the common-code ifunc variant. ChangeLog: * sysdeps/s390/Makefile (sysdep_routines): Add memmove-c. * sysdeps/s390/ifunc-memcpy.h (HAVE_MEMMOVE_IFUNC, HAVE_MEMMOVE_IFUNC_AND_VX_SUPPORT, MEMMOVE_DEFAULT, HAVE_MEMMOVE_C, MEMMOVE_C, HAVE_MEMMOVE_Z13, MEMMOVE_Z13): New defines. * sysdeps/s390/memcpy-z900.S: Add z13 memmove implementation. * sysdeps/s390/memmove-c.c: New file. * sysdeps/s390/memmove.c: Likewise. * sysdeps/s390/multiarch/ifunc-impl-list.c (__libc_ifunc_impl_list): Add ifunc variants for memmove. (cherry picked from commit cdd927d98cc38acf55e1c6594b5c9451df8f239f) --- sysdeps/s390/Makefile | 3 +- sysdeps/s390/ifunc-memcpy.h | 35 +++++++++++++ sysdeps/s390/memcpy-z900.S | 87 ++++++++++++++++++++++++++++++++ sysdeps/s390/memmove-c.c | 37 ++++++++++++++ sysdeps/s390/memmove.c | 44 ++++++++++++++++ sysdeps/s390/multiarch/ifunc-impl-list.c | 12 +++++ 6 files changed, 217 insertions(+), 1 deletion(-) create mode 100644 sysdeps/s390/memmove-c.c create mode 100644 sysdeps/s390/memmove.c Index: glibc-2.26/sysdeps/s390/Makefile =================================================================== --- glibc-2.26.orig/sysdeps/s390/Makefile +++ glibc-2.26/sysdeps/s390/Makefile @@ -31,5 +31,6 @@ sysdeps-gconv-modules = ../sysdeps/s390/ endif ifeq ($(subdir),string) -sysdep_routines += mempcpy memcpy memcpy-z900 +sysdep_routines += mempcpy memcpy memcpy-z900 \ + memmove memmove-c endif Index: glibc-2.26/sysdeps/s390/ifunc-memcpy.h =================================================================== --- glibc-2.26.orig/sysdeps/s390/ifunc-memcpy.h +++ glibc-2.26/sysdeps/s390/ifunc-memcpy.h @@ -43,6 +43,29 @@ # define HAVE_MEMCPY_Z196 HAVE_MEMCPY_IFUNC #endif +#if defined SHARED && defined USE_MULTIARCH && IS_IN (libc) \ + && ! defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT +# define HAVE_MEMMOVE_IFUNC 1 +#else +# define HAVE_MEMMOVE_IFUNC 0 +#endif + +#ifdef HAVE_S390_VX_ASM_SUPPORT +# define HAVE_MEMMOVE_IFUNC_AND_VX_SUPPORT HAVE_MEMMOVE_IFUNC +#else +# define HAVE_MEMMOVE_IFUNC_AND_VX_SUPPORT 0 +#endif + +#if defined HAVE_S390_MIN_Z13_ZARCH_ASM_SUPPORT +# define MEMMOVE_DEFAULT MEMMOVE_Z13 +# define HAVE_MEMMOVE_C 0 +# define HAVE_MEMMOVE_Z13 1 +#else +# define MEMMOVE_DEFAULT MEMMOVE_C +# define HAVE_MEMMOVE_C 1 +# define HAVE_MEMMOVE_Z13 HAVE_MEMMOVE_IFUNC_AND_VX_SUPPORT +#endif + #if HAVE_MEMCPY_Z900_G5 # define MEMCPY_Z900_G5 __memcpy_default # define MEMPCPY_Z900_G5 __mempcpy_default @@ -66,3 +89,15 @@ # define MEMCPY_Z196 NULL # define MEMPCPY_Z196 NULL #endif + +#if HAVE_MEMMOVE_C +# define MEMMOVE_C __memmove_c +#else +# define MEMMOVE_C NULL +#endif + +#if HAVE_MEMMOVE_Z13 +# define MEMMOVE_Z13 __memmove_z13 +#else +# define MEMMOVE_Z13 NULL +#endif Index: glibc-2.26/sysdeps/s390/memcpy-z900.S =================================================================== --- glibc-2.26.orig/sysdeps/s390/memcpy-z900.S +++ glibc-2.26/sysdeps/s390/memcpy-z900.S @@ -182,6 +182,7 @@ ENTRY(MEMCPY_Z196) # endif /* !defined __s390x__ */ ltgr %r4,%r4 je .L_Z196_4 +.L_Z196_start2: aghi %r4,-1 srlg %r5,%r4,8 ltgr %r5,%r5 @@ -207,6 +208,75 @@ ENTRY(MEMCPY_Z196) END(MEMCPY_Z196) #endif /* HAVE_MEMCPY_Z196 */ +#if HAVE_MEMMOVE_Z13 +ENTRY(MEMMOVE_Z13) + .machine "z13" + .machinemode "zarch_nohighgprs" +# if !defined __s390x__ + /* Note: The 31bit dst and src pointers are prefixed with zeroes. */ + llgfr %r4,%r4 + llgfr %r3,%r3 + llgfr %r2,%r2 +# endif /* !defined __s390x__ */ + sgrk %r0,%r2,%r3 + clgijh %r4,16,.L_MEMMOVE_Z13_LARGE + aghik %r5,%r4,-1 +.L_MEMMOVE_Z13_SMALL: + jl .L_MEMMOVE_Z13_END /* Jump away if len was zero. */ + /* Store up to 16 bytes with vll/vstl which needs the index + instead of lengths. */ + vll %v16,%r5,0(%r3) + vstl %v16,%r5,0(%r2) +.L_MEMMOVE_Z13_END: + br %r14 +.L_MEMMOVE_Z13_LARGE: + lgr %r1,%r2 /* For memcpy: r1: Use as dest ; + r2: Return dest */ + /* The unsigned comparison (dst - src >= len) determines if we can + execute the forward case with memcpy. */ +#if ! HAVE_MEMCPY_Z196 +# error The z13 variant of memmove needs the z196 variant of memcpy! +#endif + clgrjhe %r0,%r4,.L_Z196_start2 + risbgn %r5,%r4,4,128+63,60 /* r5 = r4 / 16 */ + aghi %r4,-16 + clgijhe %r5,8,.L_MEMMOVE_Z13_LARGE_64B +.L_MEMMOVE_Z13_LARGE_16B_LOOP: + /* Store at least 16 bytes with vl/vst. The number of 16byte blocks + is stored in r5. */ + vl %v16,0(%r4,%r3) + vst %v16,0(%r4,%r2) + aghi %r4,-16 + brctg %r5,.L_MEMMOVE_Z13_LARGE_16B_LOOP + aghik %r5,%r4,15 + j .L_MEMMOVE_Z13_SMALL +.L_MEMMOVE_Z13_LARGE_64B: + /* Store at least 128 bytes with 4x vl/vst. The number of 64byte blocks + will be stored in r0. */ + aghi %r4,-48 + srlg %r0,%r5,2 /* r5 = %r0 / 4 + => Number of 64byte blocks. */ +.L_MEMMOVE_Z13_LARGE_64B_LOOP: + vl %v20,48(%r4,%r3) + vl %v19,32(%r4,%r3) + vl %v18,16(%r4,%r3) + vl %v17,0(%r4,%r3) + vst %v20,48(%r4,%r2) + vst %v19,32(%r4,%r2) + vst %v18,16(%r4,%r2) + vst %v17,0(%r4,%r2) + aghi %r4,-64 + brctg %r0,.L_MEMMOVE_Z13_LARGE_64B_LOOP + aghi %r4,48 + /* Recalculate the number of 16byte blocks. */ + risbg %r5,%r5,62,128+63,0 /* r5 = r5 & 3 + => Remaining 16byte blocks. */ + jne .L_MEMMOVE_Z13_LARGE_16B_LOOP + aghik %r5,%r4,15 + j .L_MEMMOVE_Z13_SMALL +END(MEMMOVE_Z13) +#endif /* HAVE_MEMMOVE_Z13 */ + #if ! HAVE_MEMCPY_IFUNC /* If we don't use ifunc, define an alias for mem[p]cpy here. Otherwise see sysdeps/s390/mem[p]cpy.c. */ @@ -215,10 +285,27 @@ strong_alias (MEMPCPY_DEFAULT, __mempcpy weak_alias (__mempcpy, mempcpy) #endif +#if ! HAVE_MEMMOVE_IFUNC +/* If we don't use ifunc, define an alias for memmove here. + Otherwise see sysdeps/s390/memmove.c. */ +# if ! HAVE_MEMMOVE_C +/* If the c variant is needed, then sysdeps/s390/memmove-c.c + defines memmove. + Otherwise MEMMOVE_DEFAULT is implemented here and we have to define it. */ +strong_alias (MEMMOVE_DEFAULT, memmove) +# endif +#endif + #if defined SHARED && IS_IN (libc) /* Defines the internal symbols. Compare to libc_hidden_[builtin_]def (mem[p]cpy) in string/mem[p]cpy.c. */ strong_alias (MEMCPY_DEFAULT, __GI_memcpy) strong_alias (MEMPCPY_DEFAULT, __GI_mempcpy) strong_alias (MEMPCPY_DEFAULT, __GI___mempcpy) +# if ! HAVE_MEMMOVE_C +/* If the c variant is needed, then sysdeps/s390/memmove-c.c + defines the internal symbol. + Otherwise MEMMOVE_DEFAULT is implemented here and we have to define it. */ +strong_alias (MEMMOVE_DEFAULT, __GI_memmove) +# endif #endif Index: glibc-2.26/sysdeps/s390/memmove-c.c =================================================================== --- /dev/null +++ glibc-2.26/sysdeps/s390/memmove-c.c @@ -0,0 +1,37 @@ +/* Fallback C version of memmove. + Copyright (C) 2018 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 + <http://www.gnu.org/licenses/>. */ + +#include <ifunc-memcpy.h> + +#if HAVE_MEMMOVE_C +# if HAVE_MEMMOVE_IFUNC +/* If we use ifunc, then the memmove symbol is defined + in sysdeps/s390/memmove.c and we use a different name here. + Otherwise, we have to define memmove here or in + sysdeps/s390/memcpy.S depending on the used default implementation. */ +# define MEMMOVE MEMMOVE_C +# if defined SHARED && IS_IN (libc) +/* Define the internal symbol. */ +# undef libc_hidden_builtin_def +# define libc_hidden_builtin_def(name) \ + __hidden_ver1 (__memmove_c, __GI_memmove, __memmove_c); +# endif +# endif + +# include <string/memmove.c> +#endif Index: glibc-2.26/sysdeps/s390/memmove.c =================================================================== --- /dev/null +++ glibc-2.26/sysdeps/s390/memmove.c @@ -0,0 +1,44 @@ +/* Multiple versions of memmove. + Copyright (C) 2016-2018 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 + <http://www.gnu.org/licenses/>. */ + +#include <ifunc-memcpy.h> + +#if HAVE_MEMMOVE_IFUNC +/* If we don't use ifunc, an alias is defined for memmove + in sysdeps/s390/memmove-c.c or sysdeps/s390/memcpy.S + depending on the used default implementation. */ +# undef memmove +# define memmove __redirect_memmove +# include <string.h> +# include <ifunc-resolve.h> +# undef memmove + +# if HAVE_MEMMOVE_C +extern __typeof (__redirect_memmove) MEMMOVE_C attribute_hidden; +# endif + +# if HAVE_MEMMOVE_Z13 +extern __typeof (__redirect_memmove) MEMMOVE_Z13 attribute_hidden; +# endif + +s390_libc_ifunc_expr (__redirect_memmove, memmove, + (HAVE_MEMMOVE_Z13 && (hwcap & HWCAP_S390_VX)) + ? MEMMOVE_Z13 + : MEMMOVE_DEFAULT + ) +#endif Index: glibc-2.26/sysdeps/s390/multiarch/ifunc-impl-list.c =================================================================== --- glibc-2.26.orig/sysdeps/s390/multiarch/ifunc-impl-list.c +++ glibc-2.26/sysdeps/s390/multiarch/ifunc-impl-list.c @@ -91,6 +91,18 @@ __libc_ifunc_impl_list (const char *name ) #endif /* HAVE_MEMCPY_IFUNC */ +#if HAVE_MEMMOVE_IFUNC + IFUNC_IMPL (i, name, memmove, +# if HAVE_MEMMOVE_Z13 + IFUNC_IMPL_ADD (array, i, memmove, + dl_hwcap & HWCAP_S390_VX, MEMMOVE_Z13) +# endif +# if HAVE_MEMMOVE_C + IFUNC_IMPL_ADD (array, i, memmove, 1, MEMMOVE_C) +# endif + ) +#endif /* HAVE_MEMMOVE_IFUNC */ + #ifdef HAVE_S390_VX_ASM_SUPPORT # define IFUNC_VX_IMPL(FUNC) \
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