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64 lines
1.8 KiB
ArmAsm
64 lines
1.8 KiB
ArmAsm
/* Optimized strlen implementation using LoongArch LASX instructions.
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Copyright (C) 2023-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <sys/regdef.h>
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#include <sys/asm.h>
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#if IS_IN (libc) && !defined __loongarch_soft_float
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# define STRLEN __strlen_lasx
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LEAF(STRLEN, 6)
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move a1, a0
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bstrins.d a0, zero, 4, 0
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li.d t1, -1
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xvld xr0, a0, 0
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xvmsknz.b xr0, xr0
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xvpickve.w xr1, xr0, 4
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vilvl.h vr0, vr1, vr0
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movfr2gr.s t0, fa0 # sign extend
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sra.w t0, t0, a1
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beq t0, t1, L(loop)
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cto.w a0, t0
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jr ra
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L(loop):
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xvld xr0, a0, 32
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addi.d a0, a0, 32
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xvsetanyeqz.b fcc0, xr0
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bceqz fcc0, L(loop)
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xvmsknz.b xr0, xr0
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sub.d a0, a0, a1
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xvpickve.w xr1, xr0, 4
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vilvl.h vr0, vr1, vr0
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movfr2gr.s t0, fa0
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cto.w t0, t0
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add.d a0, a0, t0
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jr ra
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END(STRLEN)
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libc_hidden_builtin_def (STRLEN)
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#endif
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