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| author | Guo Ren <ren_guo@c-sky.com> | 2018-09-05 09:25:18 +0300 |
|---|---|---|
| committer | Guo Ren <ren_guo@c-sky.com> | 2018-10-25 19:54:24 +0300 |
| commit | c5af58b769113c4045209973052db3e3a543ee43 (patch) | |
| tree | cd31dd49aa07e63af65217f8f04d165fe328a312 /arch/csky/abiv2/memset.S | |
| parent | 9d056df0924edbb0a30c85a1c1d3153c1229ec47 (diff) | |
| download | linux-c5af58b769113c4045209973052db3e3a543ee43.tar.xz | |
csky: Library functions
This patch adds string optimize codes and some auxiliary codes.
Signed-off-by: Chen Linfei <linfei_chen@c-sky.com>
Signed-off-by: Mao Han <han_mao@c-sky.com>
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/csky/abiv2/memset.S')
| -rw-r--r-- | arch/csky/abiv2/memset.S | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/arch/csky/abiv2/memset.S b/arch/csky/abiv2/memset.S new file mode 100644 index 000000000000..a7e7d994b667 --- /dev/null +++ b/arch/csky/abiv2/memset.S @@ -0,0 +1,83 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#include <linux/linkage.h> +#include "sysdep.h" + + .weak memset +ENTRY(__memset) +ENTRY(memset) + /* Test if len less than 4 bytes. */ + mov r12, r0 + cmplti r2, 8 + bt .L_set_by_byte + + andi r13, r0, 3 + movi r19, 4 + /* Test if dest is not 4 bytes aligned. */ + bnez r13, .L_dest_not_aligned + /* Hardware can handle unaligned access directly. */ +.L_dest_aligned: + zextb r3, r1 + lsli r1, 8 + or r1, r3 + lsli r3, r1, 16 + or r3, r1 + + /* If dest is aligned, then copy. */ + zext r18, r2, 31, 4 + /* Test if len less than 16 bytes. */ + bez r18, .L_len_less_16bytes + + LABLE_ALIGN +.L_len_larger_16bytes: + stw r3, (r0, 0) + stw r3, (r0, 4) + stw r3, (r0, 8) + stw r3, (r0, 12) + PRE_BNEZAD (r18) + addi r0, 16 + BNEZAD (r18, .L_len_larger_16bytes) + +.L_len_less_16bytes: + zext r18, r2, 3, 2 + andi r2, 3 + bez r18, .L_set_by_byte +.L_len_less_16bytes_loop: + stw r3, (r0, 0) + PRE_BNEZAD (r18) + addi r0, 4 + BNEZAD (r18, .L_len_less_16bytes_loop) + + /* Test if len less than 4 bytes. */ +.L_set_by_byte: + zext r18, r2, 2, 0 + bez r18, .L_return +.L_set_by_byte_loop: + stb r1, (r0, 0) + PRE_BNEZAD (r18) + addi r0, 1 + BNEZAD (r18, .L_set_by_byte_loop) + +.L_return: + mov r0, r12 + rts + + /* If dest is not aligned, just set some bytes makes the dest + align. */ + +.L_dest_not_aligned: + sub r13, r19, r13 + sub r2, r13 +.L_dest_not_aligned_loop: + /* Makes the dest align. */ + stb r1, (r0, 0) + PRE_BNEZAD (r13) + addi r0, 1 + BNEZAD (r13, .L_dest_not_aligned_loop) + cmplti r2, 8 + bt .L_set_by_byte + /* Check whether the src is aligned. */ + jbr .L_dest_aligned +ENDPROC(memset) +ENDPROC(__memset) |