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-rw-r--r--sysdeps/tile/strstr.c270
1 files changed, 0 insertions, 270 deletions
diff --git a/sysdeps/tile/strstr.c b/sysdeps/tile/strstr.c
deleted file mode 100644
index 961e2af..0000000
--- a/sysdeps/tile/strstr.c
+++ /dev/null
@@ -1,270 +0,0 @@
-/* Copyright (C) 2013-2018 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
-
-/* Specification of strstr. */
-#include <string.h>
-
-#include <stdbool.h>
-#include "string-endian.h"
-
-#define RETURN_TYPE char *
-#define AVAILABLE(h, h_l, j, n_l) \
- (!memchr ((h) + (h_l), '\0', (j) + (n_l) - (h_l)) \
- && ((h_l) = (j) + (n_l)))
-#include "str-two-way.h"
-typeof(two_way_short_needle) two_way_short_needle __attribute__((unused));
-
-#undef strstr
-
-#ifndef STRSTR
-#define STRSTR strstr
-#endif
-
-#ifndef STRSTR2
-#define STRSTR2 strstr2
-#endif
-
-#ifndef STRCHR
-#define STRCHR strchr
-#endif
-
-#ifndef STRSTR_SCAN
-#define STRSTR_SCAN strstr_scan
-#endif
-
-#ifndef TOLOWER
-# define TOLOWER(Ch) (Ch)
-#endif
-
-#ifdef USE_AS_STRCASESTR
-
-static uint64_t
-vec_tolower (uint64_t cc)
-{
- /* For Uppercases letters, add 32 to convert to lower case. */
- uint64_t less_than_eq_Z = v1cmpltui (cc, 'Z' + 1);
- uint64_t less_than_A = v1cmpltui (cc, 'A');
- uint64_t is_upper = v1cmpne (less_than_eq_Z, less_than_A);
- return v1add (cc, v1shli (is_upper, 5));
-}
-
-/* There is no strcasechr() defined, but needed for 1 byte case
- of strcasestr(), so create it here. */
-
-static char *
-strcasechr (const char *s, int c)
-{
- int z, g;
-
- c = tolower (c);
-
- /* Get an aligned pointer. */
- const uintptr_t s_int = (uintptr_t) s;
- const uint64_t *p = (const uint64_t *) (s_int & -8);
-
- /* Create eight copies of the byte for which we are looking. */
- const uint64_t goal = copy_byte(c);
-
- /* Read the first aligned word, but force bytes before the string to
- match neither zero nor goal (we make sure the high bit of each byte
- is 1, and the low 7 bits are all the opposite of the goal byte). */
- const uint64_t before_mask = MASK (s_int);
- uint64_t v =
- (vec_tolower (*p) | before_mask) ^ (goal & v1shrui (before_mask, 1));
-
- uint64_t zero_matches, goal_matches;
- while (1)
- {
- /* Look for a terminating '\0'. */
- zero_matches = v1cmpeqi (v, 0);
-
- /* Look for the goal byte. */
- goal_matches = v1cmpeq (v, goal);
-
- if (__builtin_expect ((zero_matches | goal_matches) != 0, 0))
- break;
-
- v = vec_tolower (*++p);
- }
-
- z = CFZ (zero_matches);
- g = CFZ (goal_matches);
-
- /* If we found c before '\0' we got a match. Note that if c == '\0'
- then g == z, and we correctly return the address of the '\0'
- rather than NULL. */
- return (g <= z) ? ((char *) p) + (g >> 3) : NULL;
-}
-
-# define vec_load(p) vec_tolower (*(p))
-# define STRCHR strcasechr
-# define CMP_FUNC __strncasecmp
-
-#else
-
-# define vec_load(p) (*(p))
-# define STRCHR strchr
-# define CMP_FUNC memcmp
-
-#endif
-
-
-/* Compare 2-character needle using SIMD. */
-static char *
-STRSTR2 (const char *haystack_start, const char *needle)
-{
- int z, g;
-
- __insn_prefetch (haystack_start + 64);
-
- /* Get an aligned pointer. */
- const uintptr_t s_int = (uintptr_t) haystack_start;
- const uint64_t *p = (const uint64_t *) (s_int & -8);
-
- /* Create eight copies of the first byte for which we are looking. */
- const uint64_t byte1 = copy_byte (TOLOWER (*needle));
- /* Create eight copies of the second byte for which we are looking. */
- const uint64_t byte2 = copy_byte (TOLOWER (*(needle + 1)));
-
- /* Read the first aligned word, but force bytes before the string to
- match neither zero nor goal (we make sure the high bit of each byte
- is 1, and the low 7 bits are all the opposite of the goal byte). */
- const uint64_t before_mask = MASK (s_int);
- uint64_t v =
- (vec_load (p) | before_mask) ^ (byte1 & v1shrui (before_mask, 1));
-
- uint64_t zero_matches, goal_matches;
- while (1)
- {
- /* Look for a terminating '\0'. */
- zero_matches = v1cmpeqi (v, 0);
- uint64_t byte1_matches = v1cmpeq (v, byte1);
- if (__builtin_expect (zero_matches != 0, 0))
- {
- /* This is the last vector. Don't worry about matches
- crossing into the next vector. Shift the second byte
- back 1 byte to align it with the first byte, then and to
- check for both matching. Each vector has a 1 in the LSB
- of the byte if there was match. */
- uint64_t byte2_matches = v1cmpeq (v, byte2);
- goal_matches = byte1_matches & STRSHIFT (byte2_matches, 8);
- break;
- }
- else
- {
- /* This is not the last vector, so load the next vector now.
- And compare byte2 to the 8-bytes starting 1 byte shifted from v,
- which goes 1-byte into the next vector. */
- uint64_t v2 = vec_load (p + 1);
- if (byte1_matches)
- {
- /* 8-bytes starting 1 byte into v. */
- v = __insn_dblalign (v, v2, (void*)1);
- uint64_t byte2_matches_shifted = v1cmpeq (v, byte2);
- goal_matches = byte1_matches & byte2_matches_shifted;
- if (__builtin_expect (goal_matches != 0, 0))
- break;
- }
- __insn_prefetch (p + 4);
- /* Move to next vector. */
- v = v2;
- p++;
- }
- }
-
- z = CFZ (zero_matches);
- g = CFZ (goal_matches);
-
- /* If we found the match before '\0' we got a true match. Note that
- if c == '\0' then g == z, and we correctly return the address of
- the '\0' rather than NULL. */
- return (g <= z) ? ((char *) p) + (g >> 3) : NULL;
-}
-
-/* Scan for NEEDLE, using the first two characters as a filter. */
-static char *
-STRSTR_SCAN (const char *haystack, const char *needle,
- unsigned int needle_len)
-{
- char *match;
- while (1)
- {
- match = STRSTR2 (haystack, needle);
- if (match == NULL)
- return NULL;
- /* Found first two characters of needle, check for remainder. */
- if (CMP_FUNC (match + 2, needle + 2, needle_len - 2) == 0)
- return match;
- /* Move past the previous match. Could be +2 instead of +1 if
- first two characters are different, but that tested slower. */
- haystack = match + 1;
- }
-}
-
-/* Return the first occurrence of NEEDLE in HAYSTACK. Return HAYSTACK
- if NEEDLE is empty, otherwise NULL if NEEDLE is not found in
- HAYSTACK. */
-char *
-STRSTR (const char *haystack_start, const char *needle_start)
-{
- const char *haystack = haystack_start;
- const char *needle = needle_start;
- __insn_prefetch (haystack);
- size_t needle_len = strlen (needle_start); /* Length of NEEDLE. */
- size_t haystack_len; /* Known minimum length of HAYSTACK. */
-
- if (needle_len <= 2)
- {
- if (needle_len == 1)
- return STRCHR (haystack_start, *needle_start);
- if (needle_len == 0)
- return (char *) haystack_start;
- else
- return STRSTR2 (haystack_start, needle_start);
- }
-
- /* Fail if NEEDLE is longer than HAYSTACK. */
- if (__strnlen (haystack, needle_len) < needle_len)
- return NULL;
-
- /* Perform the search. Abstract memory is considered to be an array
- of 'unsigned char' values, not an array of 'char' values. See
- ISO C 99 section 6.2.6.1. */
- if (needle_len < 40)
- return STRSTR_SCAN (haystack_start, needle_start, needle_len);
- else
- {
- /* Reduce the size of haystack using STRSTR2, since it has a smaller
- linear coefficient than the Two-Way algorithm. */
- haystack = STRSTR2 (haystack_start, needle_start);
- if (haystack == NULL)
- return NULL;
- needle = needle_start;
- haystack_len = (haystack > haystack_start + needle_len ? 1
- : needle_len + haystack_start - haystack);
-
- return two_way_long_needle ((const unsigned char *) haystack,
- haystack_len,
- (const unsigned char *) needle, needle_len);
- }
-}
-#ifndef USE_AS_STRCASESTR
-libc_hidden_builtin_def (STRSTR)
-#endif
-
-#undef LONG_NEEDLE_THRESHOLD
generated by cgit v1.1 at 2025-01-17 22:57:37 +0000