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author | Stefan Liebler <stli@linux.ibm.com> | 2018-12-18 13:57:08 +0100 |
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committer | Stefan Liebler <stli@linux.ibm.com> | 2018-12-18 13:57:08 +0100 |
commit | cdd927d98cc38acf55e1c6594b5c9451df8f239f (patch) | |
tree | 442bb8c8fa5eb23ade648bbc99db0614cbfe56b3 /sysdeps/s390/memmove.c | |
parent | 2ee1bc57ab50737ee2ab88c4d796b90e08b4bf93 (diff) | |
download | glibc-cdd927d98cc38acf55e1c6594b5c9451df8f239f.tar.gz glibc-cdd927d98cc38acf55e1c6594b5c9451df8f239f.tar.xz glibc-cdd927d98cc38acf55e1c6594b5c9451df8f239f.zip |
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.
Diffstat (limited to 'sysdeps/s390/memmove.c')
-rw-r--r-- | sysdeps/s390/memmove.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/sysdeps/s390/memmove.c b/sysdeps/s390/memmove.c new file mode 100644 index 0000000000..ac34edf80f --- /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 + <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 |