diff options
| author | H.J. Lu <hjl.tools@gmail.com> | 2017-06-15 08:49:43 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2017-06-15 08:49:57 -0700 |
| commit | b91a52d0d77d8c532d2cfa13be0db92faa397c4b (patch) | |
| tree | 998f90835230fc8da896e806b5c887a78a66a009 /sysdeps/x86_64/multiarch/Makefile | |
| parent | 93e46f87735e59c15eece22a086948519d129e1c (diff) | |
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.
Diffstat (limited to 'sysdeps/x86_64/multiarch/Makefile')
| -rw-r--r-- | sysdeps/x86_64/multiarch/Makefile | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sysdeps/x86_64/multiarch/Makefile b/sysdeps/x86_64/multiarch/Makefile index f577175f3d..ff6c7f43de 100644 --- a/sysdeps/x86_64/multiarch/Makefile +++ b/sysdeps/x86_64/multiarch/Makefile @@ -8,6 +8,7 @@ sysdep_routines += strncat-c stpncpy-c strncpy-c strcmp-ssse3 \ strcmp-sse2-unaligned strncmp-ssse3 \ memchr-sse2 rawmemchr-sse2 memchr-avx2 rawmemchr-avx2 \ memrchr-sse2 memrchr-avx2 \ + memcmp-sse2 \ memcmp-avx2-movbe \ memcmp-sse4 memcpy-ssse3 \ memmove-ssse3 \ |