128 lines
1.9 KiB
ArmAsm
128 lines
1.9 KiB
ArmAsm
/* The assembly function for string copy. C-SKY ABIV2 version.
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Copyright (C) 2018 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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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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ENTRY (strcpy)
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mov a3, a0
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/* Check if the src addr is aligned. */
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andi t0, a1, 3
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bnez t0, 11f
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1:
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/* Check if all the bytes in the word are not zero. */
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ldw a2, (a1)
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tstnbz a2
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bf 9f
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stw a2, (a3)
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ldw a2, (a1, 4)
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tstnbz a2
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bf 2f
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stw a2, (a3, 4)
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ldw a2, (a1, 8)
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tstnbz a2
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bf 3f
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stw a2, (a3, 8)
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ldw a2, (a1, 12)
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tstnbz a2
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bf 4f
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stw a2, (a3, 12)
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ldw a2, (a1, 16)
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tstnbz a2
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bf 5f
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stw a2, (a3, 16)
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ldw a2, (a1, 20)
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tstnbz a2
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bf 6f
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stw a2, (a3, 20)
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ldw a2, (a1, 24)
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tstnbz a2
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bf 7f
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stw a2, (a3, 24)
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ldw a2, (a1, 28)
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tstnbz a2
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bf 8f
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stw a2, (a3, 28)
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addi a3, 32
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addi a1, 32
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br 1b
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2:
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addi a3, 4
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br 9f
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3:
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addi a3, 8
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br 9f
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4:
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addi a3, 12
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br 9f
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5:
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addi a3, 16
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br 9f
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6:
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addi a3, 20
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br 9f
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7:
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addi a3, 24
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br 9f
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8:
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addi a3, 28
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9:
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xtrb3 t0, a2
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st.b t0, (a3)
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bez t0, 10f
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xtrb2 t0, a2
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st.b t0, (a3, 1)
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bez t0, 10f
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xtrb1 t0, a2
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st.b t0, (a3, 2)
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bez t0, 10f
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stw a2, (a3)
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10:
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jmp lr
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11:
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subi t0, 4
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12:
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ld.b a2, (a1)
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st.b a2, (a3)
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bez a2, 10b
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addi t0, 1
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addi a1, a1, 1
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addi a3, a3, 1
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bnez t0, 12b
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br 1b
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END (strcpy)
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libc_hidden_def (strcpy)
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.weak strcpy
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