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203 lines
4.5 KiB
ArmAsm
203 lines
4.5 KiB
ArmAsm
/* Optimized strcpy stpcpy aligned implementation using basic LoongArch
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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)
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# ifndef STRCPY
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# define STRCPY __strcpy_aligned
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# endif
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#else
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# ifndef STRCPY
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# define STRCPY strcpy
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# endif
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#endif
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LEAF(STRCPY, 6)
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andi a3, a0, 0x7
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move a2, a0
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beqz a3, L(dest_align)
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sub.d a5, a1, a3
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addi.d a5, a5, 8
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L(make_dest_align):
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ld.b t0, a1, 0
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addi.d a1, a1, 1
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st.b t0, a2, 0
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addi.d a2, a2, 1
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beqz t0, L(al_out)
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bne a1, a5, L(make_dest_align)
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L(dest_align):
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andi a4, a1, 7
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bstrins.d a1, zero, 2, 0
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lu12i.w t5, 0x1010
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ld.d t0, a1, 0
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ori t5, t5, 0x101
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bstrins.d t5, t5, 63, 32
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slli.d t6, t5, 0x7
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bnez a4, L(unalign)
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sub.d t1, t0, t5
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andn t2, t6, t0
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and t3, t1, t2
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bnez t3, L(al_end)
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L(al_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 a1, a1, 8
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addi.d a2, a2, 8
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sub.d t1, t0, t5
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andn t2, t6, t0
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and t3, t1, t2
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beqz t3, L(al_loop)
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L(al_end):
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ctz.d t1, t3
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srli.d t1, t1, 3
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addi.d t1, t1, 1
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andi a3, t1, 8
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andi a4, t1, 4
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andi a5, t1, 2
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andi a6, t1, 1
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L(al_end_8):
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beqz a3, L(al_end_4)
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st.d t0, a2, 0
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#ifdef USE_AS_STPCPY
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addi.d a0, a2, 7
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#endif
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jr ra
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L(al_end_4):
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beqz a4, L(al_end_2)
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st.w t0, a2, 0
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addi.d a2, a2, 4
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srli.d t0, t0, 32
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L(al_end_2):
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beqz a5, L(al_end_1)
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st.h t0, a2, 0
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addi.d a2, a2, 2
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srli.d t0, t0, 16
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L(al_end_1):
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beqz a6, L(al_out)
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st.b t0, a2, 0
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addi.d a2, a2, 1
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L(al_out):
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#ifdef USE_AS_STPCPY
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addi.d a0, a2, -1
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#endif
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jr ra
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.align 4
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L(unalign):
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slli.d a5, a4, 3
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li.d t1, -1
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sub.d a6, zero, a5
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srl.d a7, t0, a5
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sll.d t7, t1, a6
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or t0, a7, t7
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sub.d t1, t0, t5
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andn t2, t6, t0
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and t3, t1, t2
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bnez t3, L(un_end)
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ld.d t4, a1, 8
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sub.d t1, t4, t5
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andn t2, t6, t4
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sll.d t0, t4, a6
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and t3, t1, t2
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or t0, t0, a7
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bnez t3, L(un_end_with_remaining)
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L(un_loop):
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srl.d a7, t4, a5
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ld.d t4, a1, 16
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addi.d a1, a1, 8
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st.d t0, a2, 0
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addi.d a2, a2, 8
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sub.d t1, t4, t5
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andn t2, t6, t4
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sll.d t0, t4, a6
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and t3, t1, t2
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or t0, t0, a7
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beqz t3, L(un_loop)
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L(un_end_with_remaining):
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ctz.d t1, t3
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srli.d t1, t1, 3
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addi.d t1, t1, 1
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sub.d t1, t1, a4
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blt t1, zero, L(un_end_less_8)
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st.d t0, a2, 0
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addi.d a2, a2, 8
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beqz t1, L(un_out)
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srl.d t0, t4, a5
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b L(un_end_less_8)
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L(un_end):
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ctz.d t1, t3
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srli.d t1, t1, 3
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addi.d t1, t1, 1
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L(un_end_less_8):
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andi a4, t1, 4
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andi a5, t1, 2
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andi a6, t1, 1
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L(un_end_4):
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beqz a4, L(un_end_2)
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st.w t0, a2, 0
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addi.d a2, a2, 4
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srli.d t0, t0, 32
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L(un_end_2):
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beqz a5, L(un_end_1)
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st.h t0, a2, 0
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addi.d a2, a2, 2
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srli.d t0, t0, 16
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L(un_end_1):
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beqz a6, L(un_out)
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st.b t0, a2, 0
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addi.d a2, a2, 1
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L(un_out):
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#ifdef USE_AS_STPCPY
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addi.d a0, a2, -1
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#endif
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jr ra
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END(STRCPY)
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libc_hidden_builtin_def (STRCPY)
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