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69 lines
1.4 KiB
69 lines
1.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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// Copyright (C) 2005-2017 Andes Technology Corporation |
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beq $r1, $r0, quit_memcpy |
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beqz $r2, quit_memcpy |
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srli $r3, $r2, #5 ! check if len < cache-line size 32 |
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beqz $r3, word_copy_entry |
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andi $r4, $r0, #0x3 ! check byte-align |
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beqz $r4, unalign_word_copy_entry |
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addi $r4, $r4,#-4 |
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abs $r4, $r4 ! check how many un-align byte to copy |
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sub $r2, $r2, $r4 ! update $R2 |
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unalign_byte_copy: |
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lbi1 $r3, $r1, #1 |
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addi $r4, $r4, #-1 |
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sbi1 $r3, $r0, #1 |
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bnez $r4, unalign_byte_copy |
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beqz $r2, quit_memcpy |
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unalign_word_copy_entry: |
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andi $r3, $r0, 0x1f ! check cache-line unaligncount |
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beqz $r3, cache_copy |
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addi $r3, $r3, #-32 |
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abs $r3, $r3 |
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sub $r2, $r2, $r3 ! update $R2 |
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unalign_word_copy: |
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lmw1 $r4, $r1, $r4 |
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addi $r3, $r3, #-4 |
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smw1 $r4, $r0, $r4 |
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bnez $r3, unalign_word_copy |
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beqz $r2, quit_memcpy |
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addi $r3, $r2, #-32 ! to check $r2< cache_line , than go to word_copy |
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bltz $r3, word_copy_entry |
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cache_copy: |
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srli $r3, $r2, #5 |
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beqz $r3, word_copy_entry |
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3: |
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lmw1 $r17, $r1, $r24 |
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addi $r3, $r3, #-1 |
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smw1 $r17, $r0, $r24 |
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bnez $r3, 3b |
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word_copy_entry: |
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andi $r2, $r2, #31 |
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beqz $r2, quit_memcpy |
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5: |
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srli $r3, $r2, #2 |
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beqz $r3, byte_copy |
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word_copy: |
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lmw1 $r4, $r1, $r4 |
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addi $r3, $r3, #-1 |
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smw1 $r4, $r0, $r4 |
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bnez $r3, word_copy |
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andi $r2, $r2, #3 |
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beqz $r2, quit_memcpy |
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byte_copy: |
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lbi1 $r3, $r1, #1 |
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addi $r2, $r2, #-1 |
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sbi1 $r3, $r0, #1 |
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bnez $r2, byte_copy |
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quit_memcpy:
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