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96 lines
2.3 KiB
ArmAsm
96 lines
2.3 KiB
ArmAsm
/* Optimized memchr implementation using basic LoongArch 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)
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# define MEMCHR_NAME __memchr_aligned
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#else
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# define MEMCHR_NAME memchr
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#endif
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LEAF(MEMCHR_NAME, 6)
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beqz a2, L(out)
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andi t1, a0, 0x7
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add.d a5, a0, a2
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bstrins.d a0, zero, 2, 0
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ld.d t0, a0, 0
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bstrins.d a1, a1, 15, 8
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lu12i.w a3, 0x01010
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slli.d t2, t1, 03
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bstrins.d a1, a1, 31, 16
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ori a3, a3, 0x101
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li.d t7, -1
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li.d t8, 8
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bstrins.d a1, a1, 63, 32
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bstrins.d a3, a3, 63, 32
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sll.d t2, t7, t2
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xor t0, t0, a1
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addi.d a6, a5, -1
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slli.d a4, a3, 7
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sub.d t1, t8, t1
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orn t0, t0, t2
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sub.d t2, t0, a3
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andn t3, a4, t0
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bstrins.d a6, zero, 2, 0
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and t0, t2, t3
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bgeu t1, a2, L(end)
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L(loop):
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bnez t0, L(found)
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ld.d t1, a0, 8
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xor t0, t1, a1
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addi.d a0, a0, 8
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sub.d t2, t0, a3
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andn t3, a4, t0
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and t0, t2, t3
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bne a0, a6, L(loop)
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L(end):
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sub.d t1, a5, a6
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ctz.d t0, t0
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srli.d t0, t0, 3
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sltu t1, t0, t1
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add.d a0, a0, t0
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maskeqz a0, a0, t1
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jr ra
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L(found):
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ctz.d t0, t0
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srli.d t0, t0, 3
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add.d a0, a0, t0
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jr ra
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L(out):
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move a0, zero
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jr ra
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END(MEMCHR_NAME)
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libc_hidden_builtin_def (MEMCHR_NAME)
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