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101 lines
2.6 KiB
ArmAsm
101 lines
2.6 KiB
ArmAsm
/* Optimized strnlen 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 STRNLEN __strnlen_lasx
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LEAF(STRNLEN, 6)
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beqz a1, L(ret0)
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andi t1, a0, 0x3f
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li.d t3, 65
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sub.d a2, a0, t1
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xvld xr0, a2, 0
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xvld xr1, a2, 32
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sub.d t1, t3, t1
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move a3, a0
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sltu t1, a1, t1
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xvmsknz.b xr0, xr0
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xvmsknz.b xr1, xr1
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xvpickve.w xr2, xr0, 4
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xvpickve.w xr3, xr1, 4
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vilvl.h vr0, vr2, vr0
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vilvl.h vr1, vr3, vr1
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vilvl.w vr0, vr1, vr0
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movfr2gr.d t0, fa0
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sra.d t0, t0, a0
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orn t1, t1, t0
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bnez t1, L(end)
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add.d a4, a0, a1
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move a0, a2
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addi.d a4, a4, -1
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bstrins.d a4, zero, 5, 0
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L(loop):
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xvld xr0, a0, 64
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xvld xr1, a0, 96
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addi.d a0, a0, 64
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beq a0, a4, L(out)
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xvmin.bu xr2, xr0, xr1
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xvsetanyeqz.b fcc0, xr2
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bceqz fcc0, L(loop)
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L(out):
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xvmsknz.b xr0, xr0
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xvmsknz.b xr1, xr1
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xvpickve.w xr2, xr0, 4
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xvpickve.w xr3, xr1, 4
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vilvl.h vr0, vr2, vr0
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vilvl.h vr1, vr3, vr1
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vilvl.w vr0, vr1, vr0
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movfr2gr.d t0, fa0
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L(end):
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sub.d a0, a0, a3
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cto.d t0, t0
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add.d a0, a0, t0
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sltu t1, a0, a1
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masknez t0, a1, t1
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maskeqz t1, a0, t1
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or a0, t0, t1
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jr ra
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L(ret0):
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move a0, zero
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jr ra
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END(STRNLEN)
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libc_hidden_def (STRNLEN)
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#endif
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