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GeezerVison is showing github.com — gh-97982: Remove asciilib_count() by vstinner · Pull Request #98164 · python/cpython Conversation
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I prefer to remove it to avoid people making the assumption that it's faster just because it exists: #98025 (comment)
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Rationale for the removal: asciilib_count() is the same code than ucs1lib_count() and so has the same performance. See my benchmark: #98025 (comment) |
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serhiy-storchaka
approved these changes
Oct 11, 2022
| // gh-97982: Implementing asciilib_count() is not worth it, FASTSEARCH() does | ||
| // not specialize the code for ASCII strings. Use ucs1lib_count() for ASCII and | ||
| // UCS1 strings: it's the same than asciilib_count(). | ||
| #if STRINGLIB_MAX_CHAR > 0x7Fu |
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Maybe !STRINGLIB_IS_UNICODE || STRINGLIB_MAX_CHAR > 0x7Fu?
STRINGLIB_MAX_CHAR was only used in codecs.h when STRINGLIB_IS_UNICODE is true.
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Oh thanks, that makes my PR shorter!
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asciilib_count() is the same than ucs1lib_count(): the code is not specialized for ASCII strings, so it's not worth it to have a separated function. Remove asciilib_count() function.
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I compared the output of The only difference are the function names, the code is the same. --- ASCII 2022-10-11 17:58:22.182135206 +0200 +++ UCS1 2022-10-11 17:58:25.069159913 +0200 @@ -1,5 +1,5 @@ static inline Py_ssize_t -asciilib_count(const Py_UCS1* str, Py_ssize_t str_len, +ucs1lib_count(const Py_UCS1* str, Py_ssize_t str_len, const Py_UCS1* sub, Py_ssize_t sub_len, Py_ssize_t maxcount) { @@ -8,13 +8,13 @@ return 0; if (sub_len == 0) return (str_len < maxcount) ? str_len + 1 : maxcount; - count = asciilib_fastsearch(str, str_len, sub, sub_len, maxcount, 0); + count = ucs1lib_fastsearch(str, str_len, sub, sub_len, maxcount, 0); if (count < 0) return 0; return count; } static inline Py_ssize_t -asciilib_find_char(const Py_UCS1* s, Py_ssize_t n, Py_UCS1 ch) +ucs1lib_find_char(const Py_UCS1* s, Py_ssize_t n, Py_UCS1 ch) { const Py_UCS1 *p, *e; p = s; @@ -35,7 +35,7 @@ return -1; } static inline Py_ssize_t -asciilib_rfind_char(const Py_UCS1* s, Py_ssize_t n, Py_UCS1 ch) +ucs1lib_rfind_char(const Py_UCS1* s, Py_ssize_t n, Py_UCS1 ch) { const Py_UCS1 *p; if (n > 15) { @@ -55,7 +55,7 @@ return -1; } static inline Py_ssize_t -asciilib__lex_search(const Py_UCS1 *needle, Py_ssize_t len_needle, +ucs1lib__lex_search(const Py_UCS1 *needle, Py_ssize_t len_needle, Py_ssize_t *return_period, int invert_alphabet) { Py_ssize_t max_suffix = 0; @@ -90,13 +90,13 @@ return max_suffix; } static inline Py_ssize_t -asciilib__factorize(const Py_UCS1 *needle, +ucs1lib__factorize(const Py_UCS1 *needle, Py_ssize_t len_needle, Py_ssize_t *return_period) { Py_ssize_t cut1, period1, cut2, period2, cut, period; - cut1 = asciilib__lex_search(needle, len_needle, &period1, 0); - cut2 = asciilib__lex_search(needle, len_needle, &period2, 1); + cut1 = ucs1lib__lex_search(needle, len_needle, &period1, 0); + cut2 = ucs1lib__lex_search(needle, len_needle, &period2, 1); if (cut1 > cut2) { period = period1; cut = cut1; @@ -111,7 +111,7 @@ *return_period = period; return cut; } -typedef struct asciilib__pre { +typedef struct ucs1lib__pre { const Py_UCS1 *needle; Py_ssize_t len_needle; Py_ssize_t cut; @@ -119,14 +119,14 @@ Py_ssize_t gap; int is_periodic; uint8_t table[(1U << 6u)]; -} asciilib_prework; +} ucs1lib_prework; static void -asciilib__preprocess(const Py_UCS1 *needle, Py_ssize_t len_needle, - asciilib_prework *p) +ucs1lib__preprocess(const Py_UCS1 *needle, Py_ssize_t len_needle, + ucs1lib_prework *p) { p->needle = needle; p->len_needle = len_needle; - p->cut = asciilib__factorize(needle, len_needle, &(p->period)); + p->cut = ucs1lib__factorize(needle, len_needle, &(p->period)); (( p->period + p->cut <= len_needle ) ? (void) (0) : __assert_fail ( @@ -191,8 +191,8 @@ } } static Py_ssize_t -asciilib__two_way(const Py_UCS1 *haystack, Py_ssize_t len_haystack, - asciilib_prework *p) +ucs1lib__two_way(const Py_UCS1 *haystack, Py_ssize_t len_haystack, + ucs1lib_prework *p) { const Py_ssize_t len_needle = p->len_needle; const Py_ssize_t cut = p->cut; @@ -333,30 +333,30 @@ return -1; } static Py_ssize_t -asciilib__two_way_find(const Py_UCS1 *haystack, +ucs1lib__two_way_find(const Py_UCS1 *haystack, Py_ssize_t len_haystack, const Py_UCS1 *needle, Py_ssize_t len_needle) { ; - asciilib_prework p; - asciilib__preprocess(needle, len_needle, &p); - return asciilib__two_way(haystack, len_haystack, &p); + ucs1lib_prework p; + ucs1lib__preprocess(needle, len_needle, &p); + return ucs1lib__two_way(haystack, len_haystack, &p); } static Py_ssize_t -asciilib__two_way_count(const Py_UCS1 *haystack, +ucs1lib__two_way_count(const Py_UCS1 *haystack, Py_ssize_t len_haystack, const Py_UCS1 *needle, Py_ssize_t len_needle, Py_ssize_t maxcount) { ; - asciilib_prework p; - asciilib__preprocess(needle, len_needle, &p); + ucs1lib_prework p; + ucs1lib__preprocess(needle, len_needle, &p); Py_ssize_t index = 0, count = 0; while (1) { Py_ssize_t result; - result = asciilib__two_way(haystack + index, + result = ucs1lib__two_way(haystack + index, len_haystack - index, &p); if (result == -1) { return count; @@ -370,7 +370,7 @@ return count; } static inline Py_ssize_t -asciilib_default_find(const Py_UCS1* s, Py_ssize_t n, +ucs1lib_default_find(const Py_UCS1* s, Py_ssize_t n, const Py_UCS1* p, Py_ssize_t m, Py_ssize_t maxcount, int mode) { @@ -422,7 +422,7 @@ return mode == 0 ? count : -1; } static Py_ssize_t -asciilib_adaptive_find(const Py_UCS1* s, Py_ssize_t n, +ucs1lib_adaptive_find(const Py_UCS1* s, Py_ssize_t n, const Py_UCS1* p, Py_ssize_t m, Py_ssize_t maxcount, int mode) { @@ -462,11 +462,11 @@ hits += j + 1; if (hits > m / 4 && w - i > 2000) { if (mode == 1) { - res = asciilib__two_way_find(s + i, n - i, p, m); + res = ucs1lib__two_way_find(s + i, n - i, p, m); return res == -1 ? -1 : res + i; } else { - res = asciilib__two_way_count(s + i, n - i, p, m, + res = ucs1lib__two_way_count(s + i, n - i, p, m, maxcount - count); return res + count; } @@ -487,7 +487,7 @@ return mode == 0 ? count : -1; } static Py_ssize_t -asciilib_default_rfind(const Py_UCS1* s, Py_ssize_t n, +ucs1lib_default_rfind(const Py_UCS1* s, Py_ssize_t n, const Py_UCS1* p, Py_ssize_t m, Py_ssize_t maxcount, int mode) { @@ -526,7 +526,7 @@ return -1; } static inline Py_ssize_t -asciilib_count_char(const Py_UCS1 *s, Py_ssize_t n, +ucs1lib_count_char(const Py_UCS1 *s, Py_ssize_t n, const Py_UCS1 p0, Py_ssize_t maxcount) { Py_ssize_t i, count = 0; @@ -541,7 +541,7 @@ return count; } static inline Py_ssize_t -asciilib_fastsearch(const Py_UCS1* s, Py_ssize_t n, +ucs1lib_fastsearch(const Py_UCS1* s, Py_ssize_t n, const Py_UCS1* p, Py_ssize_t m, Py_ssize_t maxcount, int mode) { @@ -553,30 +553,30 @@ return -1; } if (mode == 1) - return asciilib_find_char(s, n, p[0]); + return ucs1lib_find_char(s, n, p[0]); else if (mode == 2) - return asciilib_rfind_char(s, n, p[0]); + return ucs1lib_rfind_char(s, n, p[0]); else { - return asciilib_count_char(s, n, p[0], maxcount); + return ucs1lib_count_char(s, n, p[0], maxcount); } } if (mode != 2) { if (n < 2500 || (m < 100 && n < 30000) || m < 6) { - return asciilib_default_find(s, n, p, m, maxcount, mode); + return ucs1lib_default_find(s, n, p, m, maxcount, mode); } else if ((m >> 2) * 3 < (n >> 2)) { if (mode == 1) { - return asciilib__two_way_find(s, n, p, m); + return ucs1lib__two_way_find(s, n, p, m); } else { - return asciilib__two_way_count(s, n, p, m, maxcount); + return ucs1lib__two_way_count(s, n, p, m, maxcount); } } else { - return asciilib_adaptive_find(s, n, p, m, maxcount, mode); + return ucs1lib_adaptive_find(s, n, p, m, maxcount, mode); } } else { - return asciilib_default_rfind(s, n, p, m, maxcount, mode); + return ucs1lib_default_rfind(s, n, p, m, maxcount, mode); } } |
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* main: (38 commits) pythongh-98251: Allow venv to pass along PYTHON* variables to pip and ensurepip when they do not impact path resolution (pythonGH-98259) Bpo-41246: IOCP Proactor avoid callback code duplication (python#21399) bpo-46364: Use sockets for stdin of asyncio only on AIX (python#30596) pythongh-98178: syslog() is not thread-safe on macOS (python#98213) Mark all targets in `Doc/Makefile` as `PHONY` (pythonGH-98189) pythongh-97982: Factorize PyUnicode_Count() and unicode_count() code (python#98025) pythongh-96265: Formatting changes for faq/general (python#98129) tutorial: remove "with single quotes" (python#98204) pythongh-97669: Remove Tools/scripts/startuptime.py (python#98214) signalmodule.c uses _PyErr_WriteUnraisableMsg() (python#98217) pythongh-97669: Fix test_tools reference leak (python#98216) pythongh-97669: Create Tools/patchcheck/ directory (python#98186) pythongh-65046: Link to logging cookbook from asyncio docs (python#98207) Formatting fixes in contextlib docs (python#98111) pythongh-95276: Add callable entry to the glossary (python#95738) pythongh-96130: Rephrase use of "typecheck" verb for clarity (python#98144) Fix some incorrect indentation around the main switch (python#98177) pythongh-98172: Fix formatting in `except*` docs (python#98173) pythongh-97982: Remove asciilib_count() (python#98164) pythongh-95756: Free and NULL-out code caches when needed (pythonGH-98181) ...
carljm
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* main: (37 commits) pythongh-98251: Allow venv to pass along PYTHON* variables to pip and ensurepip when they do not impact path resolution (pythonGH-98259) Bpo-41246: IOCP Proactor avoid callback code duplication (python#21399) bpo-46364: Use sockets for stdin of asyncio only on AIX (python#30596) pythongh-98178: syslog() is not thread-safe on macOS (python#98213) Mark all targets in `Doc/Makefile` as `PHONY` (pythonGH-98189) pythongh-97982: Factorize PyUnicode_Count() and unicode_count() code (python#98025) pythongh-96265: Formatting changes for faq/general (python#98129) tutorial: remove "with single quotes" (python#98204) pythongh-97669: Remove Tools/scripts/startuptime.py (python#98214) signalmodule.c uses _PyErr_WriteUnraisableMsg() (python#98217) pythongh-97669: Fix test_tools reference leak (python#98216) pythongh-97669: Create Tools/patchcheck/ directory (python#98186) pythongh-65046: Link to logging cookbook from asyncio docs (python#98207) Formatting fixes in contextlib docs (python#98111) pythongh-95276: Add callable entry to the glossary (python#95738) pythongh-96130: Rephrase use of "typecheck" verb for clarity (python#98144) Fix some incorrect indentation around the main switch (python#98177) pythongh-98172: Fix formatting in `except*` docs (python#98173) pythongh-97982: Remove asciilib_count() (python#98164) pythongh-95756: Free and NULL-out code caches when needed (pythonGH-98181) ...
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