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/* Optimized string comparison.
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Copyright (C) 2001-2002, 2007, 2009-2012 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published
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by the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* Written by Bruno Haible <bruno@clisp.org>. */
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/* STREQ_OPT allows to optimize string comparison with a small literal string.
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STREQ_OPT (s, "EUC-KR", 'E', 'U', 'C', '-', 'K', 'R', 0, 0, 0)
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is semantically equivalent to
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strcmp (s, "EUC-KR") == 0
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/* Help GCC to generate good code for string comparisons with
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#if defined (__GNUC__) && defined (__OPTIMIZE__)
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streq9 (const char *s1, const char *s2)
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return strcmp (s1 + 9, s2 + 9) == 0;
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streq8 (const char *s1, const char *s2, char s28)
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return streq9 (s1, s2);
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streq7 (const char *s1, const char *s2, char s27, char s28)
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return streq8 (s1, s2, s28);
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streq6 (const char *s1, const char *s2, char s26, char s27, char s28)
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return streq7 (s1, s2, s27, s28);
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streq5 (const char *s1, const char *s2, char s25, char s26, char s27, char s28)
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return streq6 (s1, s2, s26, s27, s28);
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streq4 (const char *s1, const char *s2, char s24, char s25, char s26, char s27, char s28)
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return streq5 (s1, s2, s25, s26, s27, s28);
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streq3 (const char *s1, const char *s2, char s23, char s24, char s25, char s26, char s27, char s28)
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return streq4 (s1, s2, s24, s25, s26, s27, s28);
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streq2 (const char *s1, const char *s2, char s22, char s23, char s24, char s25, char s26, char s27, char s28)
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return streq3 (s1, s2, s23, s24, s25, s26, s27, s28);
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streq1 (const char *s1, const char *s2, char s21, char s22, char s23, char s24, char s25, char s26, char s27, char s28)
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return streq2 (s1, s2, s22, s23, s24, s25, s26, s27, s28);
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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)
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return streq1 (s1, s2, s21, s22, s23, s24, s25, s26, s27, s28);
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#define STREQ_OPT(s1,s2,s20,s21,s22,s23,s24,s25,s26,s27,s28) \
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streq0 (s1, s2, s20, s21, s22, s23, s24, s25, s26, s27, s28)
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#define STREQ_OPT(s1,s2,s20,s21,s22,s23,s24,s25,s26,s27,s28) \
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(strcmp (s1, s2) == 0)
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#endif /* _GL_STREQ_H */