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c2567b18fd
There is no need for __GI_XXX symbols, like __GI___strcpy_aligned since __strcpy_aligned is used directly. Signed-off-by: H.J. Lu <hjl.tools@gmail.com> Reviewed-by: Sam James <sam@gentoo.org>
138 lines
3.0 KiB
ArmAsm
138 lines
3.0 KiB
ArmAsm
/* Optimized strcpy unaligned implementation using basic LoongArch
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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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# ifndef STRCPY
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# define STRCPY __strcpy_unaligned
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# endif
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# ifdef USE_AS_STPCPY
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# define dstend a0
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# else
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# define dstend a4
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# endif
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LEAF(STRCPY, 6)
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lu12i.w t5, 0x01010
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li.w t0, 0xff8
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ori t5, t5, 0x101
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andi t1, a1, 0xfff
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bstrins.d t5, t5, 63, 32
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move a2, a0
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slli.d t6, t5, 7
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bltu t0, t1, L(page_cross)
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L(start_entry):
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ld.d t0, a1, 0
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li.d t3, 8
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andi a3, a1, 0x7
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sub.d t1, t0, t5
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andn t2, t6, t0
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sub.d t3, t3, a3
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and t1, t1, t2
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bnez t1, L(end)
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add.d a1, a1, t3
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st.d t0, a2, 0
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add.d a2, a2, t3
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ld.d t0, a1, 0
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sub.d t1, t0, t5
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andn t2, t6, t0
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and t1, t1, t2
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bnez t1, L(long_end)
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L(loop):
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st.d t0, a2, 0
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ld.d t0, a1, 8
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addi.d a2, a2, 8
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addi.d a1, a1, 8
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sub.d t1, t0, t5
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andn t2, t6, t0
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and t1, t1, t2
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beqz t1, L(loop)
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L(long_end):
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ctz.d t1, t1
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srli.d t1, t1, 3
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add.d a1, a1, t1
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ld.d t0, a1, -7
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add.d dstend, a2, t1
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st.d t0, dstend, -7
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jr ra
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nop
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L(end):
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ctz.d t1, t1
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srli.d t1, t1, 3
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add.d a3, a1, t1
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add.d dstend, a2, t1
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L(less_8):
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li.d t0, 3
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bltu t1, t0, L(less_3)
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ld.w t1, a1, 0
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ld.w t2, a3, -3
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st.w t1, a2, 0
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st.w t2, dstend, -3
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jr ra
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L(less_3):
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beqz t1, L(zero_bytes)
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ld.h t1, a1, 0
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st.h t1, a2, 0
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L(zero_bytes):
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st.b zero, dstend, 0
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jr ra
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L(page_cross):
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move a4, a1
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bstrins.d a4, zero, 2, 0
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ld.d t0, a4, 0
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li.d t3, -1
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slli.d t4, a1, 3
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srl.d t3, t3, t4
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srl.d t0, t0, t4
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orn t0, t0, t3
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sub.d t1, t0, t5
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andn t2, t6, t0
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and t1, t1, t2
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beqz t1, L(start_entry)
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b L(end)
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END(STRCPY)
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#endif
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