1/* Optimized version of the standard strcmp() function. 2 This file is part of the GNU C Library. 3 Copyright (C) 2000-2022 Free Software Foundation, Inc. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <https://www.gnu.org/licenses/>. */ 18 19/* Return: the result of the comparison 20 21 Inputs: 22 in0: s1 23 in1: s2 24 25 Unlike memcmp(), this function is optimized for mismatches within the 26 first few characters. */ 27 28#include <sysdep.h> 29#undef ret 30 31#define s1 in0 32#define s2 in1 33 34#define val1 r15 35#define val2 r16 36 37 38ENTRY(strcmp) 39 alloc r2 = ar.pfs, 2, 0, 0, 0 40.loop: 41 ld1 val1 = [s1], 1 42 ld1 val2 = [s2], 1 43 cmp.eq p6, p0 = r0, r0 // set p6 44 ;; 45 cmp.ne.and p6, p0 = val1, r0 46 cmp.ne.and p6, p0 = val2, r0 47 cmp.eq.and p6, p0 = val1, val2 48(p6) br.cond.sptk .loop 49 sub ret0 = val1, val2 50 br.ret.sptk.many b0 51END(strcmp) 52libc_hidden_builtin_def (strcmp) 53