/* Optimized strlen implementation using LoongArch LSX instructions. Copyright (C) 2023 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, see . */ #include #include #include #if IS_IN (libc) && !defined __loongarch_soft_float # define STRLEN __strlen_lsx LEAF(STRLEN, 6) move a1, a0 bstrins.d a0, zero, 4, 0 vld vr0, a0, 0 vld vr1, a0, 16 li.d t1, -1 vmsknz.b vr0, vr0 vmsknz.b vr1, vr1 vilvl.h vr0, vr1, vr0 movfr2gr.s t0, fa0 sra.w t0, t0, a1 beq t0, t1, L(loop) cto.w a0, t0 jr ra nop nop nop L(loop): vld vr0, a0, 32 vld vr1, a0, 48 addi.d a0, a0, 32 vmin.bu vr2, vr0, vr1 vsetanyeqz.b fcc0, vr2 bceqz fcc0, L(loop) vmsknz.b vr0, vr0 vmsknz.b vr1, vr1 vilvl.h vr0, vr1, vr0 sub.d a0, a0, a1 movfr2gr.s t0, fa0 cto.w t0, t0 add.d a0, a0, t0 jr ra END(STRLEN) libc_hidden_builtin_def (STRLEN) #endif