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74 lines
2.0 KiB
ArmAsm
74 lines
2.0 KiB
ArmAsm
/* Optimized strlen implementation using LoongArch LSX instructions.
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Copyright (C) 2023-2024 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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#ifndef AS_STRCHRNUL
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# define STRCHR __strchr_lsx
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#endif
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LEAF(STRCHR, 6)
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andi t1, a0, 0xf
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bstrins.d a0, zero, 3, 0
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vld vr0, a0, 0
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li.d t2, -1
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vreplgr2vr.b vr1, a1
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sll.d t3, t2, t1
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vxor.v vr2, vr0, vr1
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vmin.bu vr0, vr0, vr2
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vmsknz.b vr0, vr0
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movfr2gr.s t0, fa0
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ext.w.h t0, t0
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orn t0, t0, t3
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beq t0, t2, L(loop)
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L(found):
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cto.w t0, t0
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add.d a0, a0, t0
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#ifndef AS_STRCHRNUL
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vreplve.b vr2, vr2, t0
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vpickve2gr.bu t1, vr2, 0
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masknez a0, a0, t1
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#endif
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jr ra
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L(loop):
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vld vr0, a0, 16
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addi.d a0, a0, 16
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vxor.v vr2, vr0, vr1
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vmin.bu vr0, vr0, vr2
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vsetanyeqz.b fcc0, vr0
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bceqz fcc0, L(loop)
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vmsknz.b vr0, vr0
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movfr2gr.s t0, fa0
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b L(found)
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END(STRCHR)
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libc_hidden_builtin_def (STRCHR)
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#endif
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