From b91a52d0d77d8c532d2cfa13be0db92faa397c4b Mon Sep 17 00:00:00 2001 From: "H.J. Lu" Date: Thu, 15 Jun 2017 08:49:43 -0700 Subject: x86-64: Implement memcmp family IFUNC selectors in C Implement memcmp family IFUNC selectors in C. All internal calls within libc.so can use IFUNC on x86-64 since unlike x86, x86-64 supports PC-relative addressing to access the GOT entry so that it can call via PLT without using an extra register. For libc.a, we can't use IFUNC for functions which are called before IFUNC has been initialized. Use IFUNC internally reduces the icache footprint since libc.so and other codes in the process use the same implementations. This patch uses IFUNC for memcmp family functions within libc. * sysdeps/x86_64/multiarch/Makefile (sysdep_routines): Add memcmp-sse2. * sysdeps/x86_64/multiarch/ifunc-memcmp.h: New file. * sysdeps/x86_64/multiarch/memcmp-sse2.S: Likewise. * sysdeps/x86_64/multiarch/memcmp.c: Likewise. * sysdeps/x86_64/multiarch/wmemcmp.c: Likewise. * sysdeps/x86_64/multiarch/memcmp.S: Removed. * sysdeps/x86_64/multiarch/wmemcmp.S: Likewise. --- ChangeLog | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'ChangeLog') diff --git a/ChangeLog b/ChangeLog index be7c6ae..67bb7eb 100644 --- a/ChangeLog +++ b/ChangeLog @@ -2,6 +2,18 @@ Erich Elsen * sysdeps/x86_64/multiarch/Makefile (sysdep_routines): Add + memcmp-sse2. + * sysdeps/x86_64/multiarch/ifunc-memcmp.h: New file. + * sysdeps/x86_64/multiarch/memcmp-sse2.S: Likewise. + * sysdeps/x86_64/multiarch/memcmp.c: Likewise. + * sysdeps/x86_64/multiarch/wmemcmp.c: Likewise. + * sysdeps/x86_64/multiarch/memcmp.S: Removed. + * sysdeps/x86_64/multiarch/wmemcmp.S: Likewise. + +2017-06-15 H.J. Lu + Erich Elsen + + * sysdeps/x86_64/multiarch/Makefile (sysdep_routines): Add memset-sse2-unaligned-erms, and memset_chk-nonshared. * sysdeps/x86_64/multiarch/ifunc-impl-list.c (__libc_ifunc_impl_list): Add test for __memset_chk_erms. -- cgit v1.1