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d3496c9f4f
Improve strcspn performance using a much faster algorithm. It is kept simple so it works well on most targets. It is generally at least 10 times faster than the existing implementation on bench-strcspn on a few AArch64 implementations, and for some tests 100 times as fast (repeatedly calling strchr on a small string is extremely slow...). In fact the string/bits/string2.h inlines make no longer sense, as GCC already uses strlen if reject is an empty string, strchrnul is 5 times as fast as __strcspn_c1, while __strcspn_c2 and __strcspn_c3 are slower than the strcspn main loop for large strings (though reject length 2-4 could be special cased in the future to gain even more performance). Tested on x86_64, i686, and aarch64. * string/Version (libc): Add GLIBC_2.24. * string/strcspn.c (strcspn): Rewrite function. * string/bits/string2.h (strcspn): Use __builtin_strcspn. (__strcspn_c1): Remove inline function. (__strcspn_c2): Likewise. (__strcspn_c3): Likewise. * string/string-inline.c [SHLIB_COMPAT(libc, GLIBC_2_1_1, GLIBC_2_24)] (__strcspn_c1): Add compatibility symbol. [SHLIB_COMPAT(libc, GLIBC_2_1_1, GLIBC_2_24)] (__strcspn_c2): Likewise. [SHLIB_COMPAT(libc, GLIBC_2_1_1, GLIBC_2_24)] (__strcspn_c3): Likewise. * sysdeps/i386/string-inlines.c: Include generic string-inlines.c.
86 lines
1.8 KiB
Plaintext
86 lines
1.8 KiB
Plaintext
libc {
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GLIBC_2.0 {
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# functions with required interface outside normal name space
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__argz_count; __argz_stringify; __argz_next;
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# functions used in inline functions or macros
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__bzero; __strtok_r;
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# functions used in other libraries
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__ffs; __mempcpy; __stpncpy; __stpcpy; __strcasecmp; __strdup;
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__strerror_r;
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# a*
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argz_add; argz_add_sep; argz_append; argz_count; argz_create;
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argz_create_sep; argz_delete; argz_extract; argz_insert; argz_next;
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argz_replace; argz_stringify;
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# b*
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basename; bcmp; bcopy; bzero;
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# e*
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envz_add; envz_entry; envz_get; envz_merge; envz_remove;
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envz_strip;
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# f*
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ffs;
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# i*
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index;
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# m*
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memccpy; memchr; memcmp; memcpy; memfrob; memmem; memmove; memset;
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# r*
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rindex;
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# s*
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stpcpy; stpncpy; strcasecmp; strcat; strchr; strcmp; strcoll; strcpy;
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strcspn; strdup; strerror; strerror_r; strfry; strlen; strncasecmp;
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strncat; strncmp; strncpy; strndup; strnlen; strpbrk; strrchr; strsep;
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strsignal; strspn; strstr; strtok; strtok_r; strxfrm; swab;
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}
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GLIBC_2.1 {
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# functions used in macros and other libraries
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__rawmemchr; __strcasestr;
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# f*
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ffsl; ffsll;
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# m*
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mempcpy;
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# r*
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rawmemchr;
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# s*
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strcasestr; strverscmp;
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}
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GLIBC_2.1.1 {
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# extern inline functions used by <bits/string2.h>
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__mempcpy_small; __stpcpy_small; __strcspn_c1; __strcspn_c2; __strcspn_c3;
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__strcpy_small; __strspn_c1; __strspn_c2; __strspn_c3; __strpbrk_c2;
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__strpbrk_c3; __strsep_1c; __strsep_2c; __strsep_3c; __strsep_g;
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__strtok_r_1c;
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# s*
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strchrnul; __strverscmp;
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}
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GLIBC_2.2 {
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# functions used in macros.
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__strndup;
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# m*
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memrchr;
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}
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GLIBC_2.3.4 {
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# x*
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__xpg_strerror_r;
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}
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GLIBC_2.6 {
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strerror_l;
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}
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GLIBC_2.24 {
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}
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}
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