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| author | Ondřej Bílka <neleai@seznam.cz> | 2013-12-14 19:33:56 +0100 |
|---|---|---|
| committer | Ondřej Bílka <neleai@seznam.cz> | 2013-12-14 20:08:13 +0100 |
| commit | 584b18eb4df61ccd447db2dfe8c8a7901f8c8598 (patch) | |
| tree | 8240dbf408eadda74685f951e36f8885f77c2f77 /sysdeps/x86_64/multiarch/ifunc-impl-list.c | |
| parent | 8a5c7897dd1c52ca74b06aaf5a3bacf0919c97aa (diff) | |
| download | glibc-584b18eb4df61ccd447db2dfe8c8a7901f8c8598.tar.gz glibc-584b18eb4df61ccd447db2dfe8c8a7901f8c8598.tar.xz glibc-584b18eb4df61ccd447db2dfe8c8a7901f8c8598.zip | |
Add strstr with unaligned loads. Fixes bug 12100.
A sse42 version of strstr used pcmpistr instruction which is quite ineffective. A faster way is look for pairs of characters which is uses sse2, is faster than pcmpistr and for real strings a pairs we look for are relatively rare. For linear time complexity we use buy or rent technique which switches to two-way algorithm when superlinear behaviour is detected.
Diffstat (limited to 'sysdeps/x86_64/multiarch/ifunc-impl-list.c')
| -rw-r--r-- | sysdeps/x86_64/multiarch/ifunc-impl-list.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/sysdeps/x86_64/multiarch/ifunc-impl-list.c b/sysdeps/x86_64/multiarch/ifunc-impl-list.c index 71beab82e4..3e2cad56cb 100644 --- a/sysdeps/x86_64/multiarch/ifunc-impl-list.c +++ b/sysdeps/x86_64/multiarch/ifunc-impl-list.c @@ -98,8 +98,6 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array, /* Support sysdeps/x86_64/multiarch/strcasestr.c. */ IFUNC_IMPL (i, name, strcasestr, - IFUNC_IMPL_ADD (array, i, strcasestr, HAS_SSE4_2, - __strcasestr_sse42) IFUNC_IMPL_ADD (array, i, strcasestr, 1, __strcasestr_sse2)) /* Support sysdeps/x86_64/multiarch/strcat.S. */ @@ -184,7 +182,7 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array, /* Support sysdeps/x86_64/multiarch/strstr-c.c. */ IFUNC_IMPL (i, name, strstr, - IFUNC_IMPL_ADD (array, i, strstr, HAS_SSE4_2, __strstr_sse42) + IFUNC_IMPL_ADD (array, i, strstr, 1, __strstr_sse2_unaligned) IFUNC_IMPL_ADD (array, i, strstr, 1, __strstr_sse2)) /* Support sysdeps/x86_64/multiarch/wcscpy.S. */ |