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347 lines
5.4 KiB
347 lines
5.4 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. |
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#include <linux/linkage.h> |
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.macro GET_FRONT_BITS rx y |
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#ifdef __cskyLE__ |
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lsri \rx, \y |
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#else |
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lsli \rx, \y |
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#endif |
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.endm |
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.macro GET_AFTER_BITS rx y |
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#ifdef __cskyLE__ |
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lsli \rx, \y |
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#else |
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lsri \rx, \y |
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#endif |
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.endm |
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/* void *memcpy(void *dest, const void *src, size_t n); */ |
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ENTRY(memcpy) |
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mov r7, r2 |
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cmplti r4, 4 |
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bt .L_copy_by_byte |
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mov r6, r2 |
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andi r6, 3 |
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cmpnei r6, 0 |
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jbt .L_dest_not_aligned |
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mov r6, r3 |
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andi r6, 3 |
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cmpnei r6, 0 |
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jbt .L_dest_aligned_but_src_not_aligned |
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.L0: |
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cmplti r4, 16 |
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jbt .L_aligned_and_len_less_16bytes |
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subi sp, 8 |
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stw r8, (sp, 0) |
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.L_aligned_and_len_larger_16bytes: |
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ldw r1, (r3, 0) |
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ldw r5, (r3, 4) |
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ldw r8, (r3, 8) |
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stw r1, (r7, 0) |
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ldw r1, (r3, 12) |
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stw r5, (r7, 4) |
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stw r8, (r7, 8) |
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stw r1, (r7, 12) |
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subi r4, 16 |
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addi r3, 16 |
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addi r7, 16 |
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cmplti r4, 16 |
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jbf .L_aligned_and_len_larger_16bytes |
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ldw r8, (sp, 0) |
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addi sp, 8 |
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cmpnei r4, 0 |
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jbf .L_return |
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.L_aligned_and_len_less_16bytes: |
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cmplti r4, 4 |
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bt .L_copy_by_byte |
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.L1: |
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ldw r1, (r3, 0) |
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stw r1, (r7, 0) |
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subi r4, 4 |
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addi r3, 4 |
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addi r7, 4 |
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cmplti r4, 4 |
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jbf .L1 |
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br .L_copy_by_byte |
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.L_return: |
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rts |
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.L_copy_by_byte: /* len less than 4 bytes */ |
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cmpnei r4, 0 |
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jbf .L_return |
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.L4: |
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ldb r1, (r3, 0) |
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stb r1, (r7, 0) |
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addi r3, 1 |
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addi r7, 1 |
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decne r4 |
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jbt .L4 |
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rts |
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/* |
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* If dest is not aligned, just copying some bytes makes the dest align. |
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* Afther that, we judge whether the src is aligned. |
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*/ |
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.L_dest_not_aligned: |
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mov r5, r3 |
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rsub r5, r5, r7 |
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abs r5, r5 |
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cmplt r5, r4 |
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bt .L_copy_by_byte |
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mov r5, r7 |
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sub r5, r3 |
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cmphs r5, r4 |
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bf .L_copy_by_byte |
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mov r5, r6 |
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.L5: |
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ldb r1, (r3, 0) /* makes the dest align. */ |
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stb r1, (r7, 0) |
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addi r5, 1 |
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subi r4, 1 |
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addi r3, 1 |
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addi r7, 1 |
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cmpnei r5, 4 |
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jbt .L5 |
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cmplti r4, 4 |
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jbt .L_copy_by_byte |
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mov r6, r3 /* judge whether the src is aligned. */ |
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andi r6, 3 |
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cmpnei r6, 0 |
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jbf .L0 |
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/* Judge the number of misaligned, 1, 2, 3? */ |
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.L_dest_aligned_but_src_not_aligned: |
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mov r5, r3 |
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rsub r5, r5, r7 |
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abs r5, r5 |
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cmplt r5, r4 |
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bt .L_copy_by_byte |
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bclri r3, 0 |
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bclri r3, 1 |
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ldw r1, (r3, 0) |
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addi r3, 4 |
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cmpnei r6, 2 |
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bf .L_dest_aligned_but_src_not_aligned_2bytes |
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cmpnei r6, 3 |
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bf .L_dest_aligned_but_src_not_aligned_3bytes |
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.L_dest_aligned_but_src_not_aligned_1byte: |
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mov r5, r7 |
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sub r5, r3 |
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cmphs r5, r4 |
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bf .L_copy_by_byte |
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cmplti r4, 16 |
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bf .L11 |
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.L10: /* If the len is less than 16 bytes */ |
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GET_FRONT_BITS r1 8 |
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mov r5, r1 |
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ldw r6, (r3, 0) |
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mov r1, r6 |
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GET_AFTER_BITS r6 24 |
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or r5, r6 |
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stw r5, (r7, 0) |
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subi r4, 4 |
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addi r3, 4 |
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addi r7, 4 |
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cmplti r4, 4 |
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bf .L10 |
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subi r3, 3 |
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br .L_copy_by_byte |
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.L11: |
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subi sp, 16 |
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stw r8, (sp, 0) |
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stw r9, (sp, 4) |
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stw r10, (sp, 8) |
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stw r11, (sp, 12) |
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.L12: |
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ldw r5, (r3, 0) |
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ldw r11, (r3, 4) |
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ldw r8, (r3, 8) |
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ldw r9, (r3, 12) |
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GET_FRONT_BITS r1 8 /* little or big endian? */ |
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mov r10, r5 |
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GET_AFTER_BITS r5 24 |
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or r5, r1 |
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GET_FRONT_BITS r10 8 |
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mov r1, r11 |
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GET_AFTER_BITS r11 24 |
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or r11, r10 |
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GET_FRONT_BITS r1 8 |
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mov r10, r8 |
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GET_AFTER_BITS r8 24 |
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or r8, r1 |
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GET_FRONT_BITS r10 8 |
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mov r1, r9 |
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GET_AFTER_BITS r9 24 |
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or r9, r10 |
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stw r5, (r7, 0) |
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stw r11, (r7, 4) |
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stw r8, (r7, 8) |
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stw r9, (r7, 12) |
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subi r4, 16 |
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addi r3, 16 |
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addi r7, 16 |
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cmplti r4, 16 |
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jbf .L12 |
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ldw r8, (sp, 0) |
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ldw r9, (sp, 4) |
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ldw r10, (sp, 8) |
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ldw r11, (sp, 12) |
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addi sp , 16 |
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cmplti r4, 4 |
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bf .L10 |
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subi r3, 3 |
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br .L_copy_by_byte |
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.L_dest_aligned_but_src_not_aligned_2bytes: |
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cmplti r4, 16 |
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bf .L21 |
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.L20: |
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GET_FRONT_BITS r1 16 |
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mov r5, r1 |
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ldw r6, (r3, 0) |
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mov r1, r6 |
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GET_AFTER_BITS r6 16 |
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or r5, r6 |
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stw r5, (r7, 0) |
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subi r4, 4 |
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addi r3, 4 |
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addi r7, 4 |
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cmplti r4, 4 |
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bf .L20 |
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subi r3, 2 |
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br .L_copy_by_byte |
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rts |
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.L21: /* n > 16 */ |
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subi sp, 16 |
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stw r8, (sp, 0) |
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stw r9, (sp, 4) |
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stw r10, (sp, 8) |
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stw r11, (sp, 12) |
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.L22: |
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ldw r5, (r3, 0) |
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ldw r11, (r3, 4) |
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ldw r8, (r3, 8) |
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ldw r9, (r3, 12) |
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GET_FRONT_BITS r1 16 |
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mov r10, r5 |
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GET_AFTER_BITS r5 16 |
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or r5, r1 |
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GET_FRONT_BITS r10 16 |
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mov r1, r11 |
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GET_AFTER_BITS r11 16 |
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or r11, r10 |
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GET_FRONT_BITS r1 16 |
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mov r10, r8 |
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GET_AFTER_BITS r8 16 |
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or r8, r1 |
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GET_FRONT_BITS r10 16 |
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mov r1, r9 |
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GET_AFTER_BITS r9 16 |
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or r9, r10 |
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stw r5, (r7, 0) |
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stw r11, (r7, 4) |
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stw r8, (r7, 8) |
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stw r9, (r7, 12) |
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subi r4, 16 |
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addi r3, 16 |
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addi r7, 16 |
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cmplti r4, 16 |
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jbf .L22 |
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ldw r8, (sp, 0) |
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ldw r9, (sp, 4) |
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ldw r10, (sp, 8) |
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ldw r11, (sp, 12) |
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addi sp, 16 |
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cmplti r4, 4 |
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bf .L20 |
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subi r3, 2 |
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br .L_copy_by_byte |
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.L_dest_aligned_but_src_not_aligned_3bytes: |
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cmplti r4, 16 |
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bf .L31 |
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.L30: |
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GET_FRONT_BITS r1 24 |
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mov r5, r1 |
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ldw r6, (r3, 0) |
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mov r1, r6 |
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GET_AFTER_BITS r6 8 |
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or r5, r6 |
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stw r5, (r7, 0) |
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subi r4, 4 |
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addi r3, 4 |
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addi r7, 4 |
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cmplti r4, 4 |
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bf .L30 |
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subi r3, 1 |
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br .L_copy_by_byte |
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.L31: |
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subi sp, 16 |
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stw r8, (sp, 0) |
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stw r9, (sp, 4) |
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stw r10, (sp, 8) |
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stw r11, (sp, 12) |
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.L32: |
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ldw r5, (r3, 0) |
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ldw r11, (r3, 4) |
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ldw r8, (r3, 8) |
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ldw r9, (r3, 12) |
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GET_FRONT_BITS r1 24 |
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mov r10, r5 |
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GET_AFTER_BITS r5 8 |
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or r5, r1 |
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GET_FRONT_BITS r10 24 |
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mov r1, r11 |
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GET_AFTER_BITS r11 8 |
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or r11, r10 |
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GET_FRONT_BITS r1 24 |
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mov r10, r8 |
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GET_AFTER_BITS r8 8 |
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or r8, r1 |
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GET_FRONT_BITS r10 24 |
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mov r1, r9 |
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GET_AFTER_BITS r9 8 |
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or r9, r10 |
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stw r5, (r7, 0) |
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stw r11, (r7, 4) |
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stw r8, (r7, 8) |
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stw r9, (r7, 12) |
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subi r4, 16 |
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addi r3, 16 |
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addi r7, 16 |
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cmplti r4, 16 |
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jbf .L32 |
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ldw r8, (sp, 0) |
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ldw r9, (sp, 4) |
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ldw r10, (sp, 8) |
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ldw r11, (sp, 12) |
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addi sp, 16 |
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cmplti r4, 4 |
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bf .L30 |
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subi r3, 1 |
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br .L_copy_by_byte
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