commit cdd927d98cc38acf55e1c6594b5c9451df8f239f Author: Stefan Liebler Date: Tue Dec 18 13:57:08 2018 +0100 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. diff --git a/sysdeps/s390/Makefile b/sysdeps/s390/Makefile index 838950a5ab958e31..3a7cccdf8f147398 100644 --- a/sysdeps/s390/Makefile +++ b/sysdeps/s390/Makefile @@ -33,5 +33,6 @@ endif ifeq ($(subdir),string) sysdep_routines += bzero memset memset-z900 \ memcmp memcmp-z900 \ - mempcpy memcpy memcpy-z900 + mempcpy memcpy memcpy-z900 \ + memmove memmove-c endif diff --git a/sysdeps/s390/ifunc-memcpy.h b/sysdeps/s390/ifunc-memcpy.h index 51c71baa2c0b0452..0e701968c8f39014 100644 --- a/sysdeps/s390/ifunc-memcpy.h +++ b/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 diff --git a/sysdeps/s390/memcpy-z900.S b/sysdeps/s390/memcpy-z900.S index 3a50cf44d85d2417..bd3b1950ee442c0c 100644 --- a/sysdeps/s390/memcpy-z900.S +++ b/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 diff --git a/sysdeps/s390/memmove-c.c b/sysdeps/s390/memmove-c.c new file mode 100644 index 0000000000000000..be571093e019a38d --- /dev/null +++ b/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 + . */ + +#include + +#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 +#endif diff --git a/sysdeps/s390/memmove.c b/sysdeps/s390/memmove.c new file mode 100644 index 0000000000000000..ac34edf80f2678cd --- /dev/null +++ b/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 + . */ + +#include + +#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 +# include +# 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 diff --git a/sysdeps/s390/multiarch/ifunc-impl-list.c b/sysdeps/s390/multiarch/ifunc-impl-list.c index 6969c480cc40e0e2..c05c63e00608dcd7 100644 --- a/sysdeps/s390/multiarch/ifunc-impl-list.c +++ b/sysdeps/s390/multiarch/ifunc-impl-list.c @@ -126,6 +126,18 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array, ) #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) \