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Improve strstr performance. Strstr tends to be slow because it uses
many calls to memchr and a slow byte loop to scan for the next match.
Performance is significantly improved by using strnlen on larger blocks
and using strchr to search for the next matching character. strcasestr
can also use strnlen to scan ahead, and memmem can use memchr to check
for the next match.
On the GLIBC bench tests the performance gains on Cortex-A72 are:
strstr: +25%
strcasestr: +4.3%
memmem: +18%
On a 256KB dataset strstr performance improves by 67%, strcasestr by 47%.
Reviewd-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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* All files with FSF copyright notices: Update copyright dates
using scripts/update-copyrights.
* locale/programs/charmap-kw.h: Regenerated.
* locale/programs/locfile-kw.h: Likewise.
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Replaced all imports of test-skeleton.c with support/test-driver.c.
In some cases it was needed to adjust do_test to return int
instead of static int since that is the method's signature expected by
test-driver.c.
Checked on x86_64.
* string/test-string.h (TEST_FUNCTION): Use test_main instead of
test_main ().
(CMDLINE_PROCESS): Use function instead of defined macro.
* debug/test-strcpy_chk.c: Import support/test-driver.c and also
<suppport/support.h> to use set_fortify_handler().
* string/bug-envz1.c: Import support/test-driver.c instead of
test-skeleton.c.
* string/bug-strcoll2.c: Likewise.
* string/bug-strtok1.c: Likewise.
* string/stratcliff.c: Likewise.
* string/test-ffs.c: Likewise.
* string/test-memccpy.c: Likewise.
* string/test-memchr.c: Likewise.
* string/test-memcmp.c: Likewise.
* string/test-memcpy.c: Likewise.
* string/test-memmem.c: Likewise.
* string/test-memmove.c: Likewise.
* string/test-memrchr.c: Likewise.
* string/test-memset.c: Likewise.
* string/test-rawmemchr.c: Likewise.
* string/test-strcasecmp.c: Likewise.
* string/test-strcasestr.c: Likewise.
* string/test-strcat.c: Likewise.
* string/test-strchr.c: Likewise.
* string/test-strcmp.c: Likewise.
* string/test-strcpy.c: Likewise.
* string/test-string.h: Likewise.
* string/test-strlen.c: Likewise.
* string/test-strncasecmp.c: Likewise.
* string/test-strncat.c: Likewise.
* string/test-strncmp.c: Likewise.
* string/test-strncpy.c: Likewise.
* string/test-strnlen.c: Likewise.
* string/test-strpbrk.c: Likewise.
* string/test-strrchr.c: Likewise.
* string/test-strspn.c: Likewise.
* string/test-strstr.c: Likewise.
* string/tst-bswap.c: Likewise.
* string/tst-cmp.c: Likewise.
* string/tst-endian.c: Likewise.
* string/tst-inlcall.c: Likewise.
* string/tst-strcoll-overflow.c: Likewise.
* string/tst-strfry.c: Likewise.
* string/tst-strlen.c: Likewise.
* string/tst-strtok.c: Likewise.
* string/tst-strtok_r.c: Likewise.
* string/tst-strxfrm.c: Likewise.
* string/tst-strxfrm2.c: Likewise.
* string/tst-svc.c: Likewise.
* string/tst-svc2.c: Likewise.
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