1 /* Optimized string comparison.
2 Copyright (C) 2001-2002, 2007, 2009-2011 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify it
5 under the terms of the GNU Lesser General Public License as published
6 by the Free Software Foundation; either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
17 /* Written by Bruno Haible <bruno@clisp.org>. */
24 /* STREQ allows to optimize string comparison with a small literal string.
25 STREQ (s, "EUC-KR", 'E', 'U', 'C', '-', 'K', 'R', 0, 0, 0)
26 is semantically equivalent to
27 strcmp (s, "EUC-KR") == 0
30 /* Help GCC to generate good code for string comparisons with
32 #if defined (__GNUC__) && defined (__OPTIMIZE__)
35 streq9 (const char *s1, const char *s2)
37 return strcmp (s1 + 9, s2 + 9) == 0;
41 streq8 (const char *s1, const char *s2, char s28)
48 return streq9 (s1, s2);
55 streq7 (const char *s1, const char *s2, char s27, char s28)
62 return streq8 (s1, s2, s28);
69 streq6 (const char *s1, const char *s2, char s26, char s27, char s28)
76 return streq7 (s1, s2, s27, s28);
83 streq5 (const char *s1, const char *s2, char s25, char s26, char s27, char s28)
90 return streq6 (s1, s2, s26, s27, s28);
97 streq4 (const char *s1, const char *s2, char s24, char s25, char s26, char s27, char s28)
104 return streq5 (s1, s2, s25, s26, s27, s28);
111 streq3 (const char *s1, const char *s2, char s23, char s24, char s25, char s26, char s27, char s28)
118 return streq4 (s1, s2, s24, s25, s26, s27, s28);
125 streq2 (const char *s1, const char *s2, char s22, char s23, char s24, char s25, char s26, char s27, char s28)
132 return streq3 (s1, s2, s23, s24, s25, s26, s27, s28);
139 streq1 (const char *s1, const char *s2, char s21, char s22, char s23, char s24, char s25, char s26, char s27, char s28)
146 return streq2 (s1, s2, s22, s23, s24, s25, s26, s27, s28);
153 streq0 (const char *s1, const char *s2, char s20, char s21, char s22, char s23, char s24, char s25, char s26, char s27, char s28)
160 return streq1 (s1, s2, s21, s22, s23, s24, s25, s26, s27, s28);
166 #define STREQ(s1,s2,s20,s21,s22,s23,s24,s25,s26,s27,s28) \
167 streq0 (s1, s2, s20, s21, s22, s23, s24, s25, s26, s27, s28)
171 #define STREQ(s1,s2,s20,s21,s22,s23,s24,s25,s26,s27,s28) \
172 (strcmp (s1, s2) == 0)
176 #endif /* _GL_STREQ_H */