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97 lines
1.4 KiB
97 lines
1.4 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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#include "sysdep.h" |
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ENTRY(strlen) |
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/* Check if the start addr is aligned. */ |
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mov r3, r0 |
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andi r1, r0, 3 |
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movi r2, 4 |
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movi r0, 0 |
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bnez r1, .L_start_not_aligned |
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LABLE_ALIGN |
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.L_start_addr_aligned: |
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/* Check if all the bytes in the word are not zero. */ |
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ldw r1, (r3) |
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tstnbz r1 |
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bf .L_string_tail |
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ldw r1, (r3, 4) |
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addi r0, 4 |
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tstnbz r1 |
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bf .L_string_tail |
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ldw r1, (r3, 8) |
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addi r0, 4 |
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tstnbz r1 |
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bf .L_string_tail |
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ldw r1, (r3, 12) |
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addi r0, 4 |
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tstnbz r1 |
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bf .L_string_tail |
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ldw r1, (r3, 16) |
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addi r0, 4 |
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tstnbz r1 |
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bf .L_string_tail |
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ldw r1, (r3, 20) |
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addi r0, 4 |
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tstnbz r1 |
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bf .L_string_tail |
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ldw r1, (r3, 24) |
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addi r0, 4 |
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tstnbz r1 |
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bf .L_string_tail |
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ldw r1, (r3, 28) |
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addi r0, 4 |
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tstnbz r1 |
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bf .L_string_tail |
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addi r0, 4 |
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addi r3, 32 |
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br .L_start_addr_aligned |
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.L_string_tail: |
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# ifdef __CSKYBE__ |
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xtrb0 r3, r1 |
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bez r3, .L_return |
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addi r0, 1 |
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xtrb1 r3, r1 |
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bez r3, .L_return |
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addi r0, 1 |
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xtrb2 r3, r1 |
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bez r3, .L_return |
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addi r0, 1 |
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# else |
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xtrb3 r3, r1 |
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bez r3, .L_return |
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addi r0, 1 |
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xtrb2 r3, r1 |
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bez r3, .L_return |
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addi r0, 1 |
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xtrb1 r3, r1 |
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bez r3, .L_return |
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addi r0, 1 |
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# endif /* !__CSKYBE__ */ |
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.L_return: |
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rts |
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.L_start_not_aligned: |
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sub r2, r2, r1 |
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.L_start_not_aligned_loop: |
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ldb r1, (r3) |
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PRE_BNEZAD (r2) |
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addi r3, 1 |
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bez r1, .L_return |
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addi r0, 1 |
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BNEZAD (r2, .L_start_not_aligned_loop) |
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br .L_start_addr_aligned |
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ENDPROC(strlen)
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