arc/lib/memcpy-700.S

0001 /* SPDX-License-Identifier: GPL-2.0-only */
0002 /*
0003  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
0004  */
0005
0006 #include <linux/linkage.h>
0007
0008 ENTRY_CFI(memcpy)
0009     or  r3,r0,r1
0010     asl_s   r3,r3,30
0011     mov_s   r5,r0
0012     brls.d  r2,r3,.Lcopy_bytewise
0013     sub.f   r3,r2,1
0014     ld_s    r12,[r1,0]
0015     asr.f   lp_count,r3,3
0016     bbit0.d r3,2,.Lnox4
0017     bmsk_s  r2,r2,1
0018     st.ab   r12,[r5,4]
0019     ld.a    r12,[r1,4]
0020 .Lnox4:
0021     lppnz   .Lendloop
0022     ld_s    r3,[r1,4]
0023     st.ab   r12,[r5,4]
0024     ld.a    r12,[r1,8]
0025     st.ab   r3,[r5,4]
0026 .Lendloop:
0027     breq    r2,0,.Last_store
0028     ld  r3,[r5,0]
0029 #ifdef __LITTLE_ENDIAN__
0030     add3    r2,-1,r2
0031     ; uses long immediate
0032     xor_s   r12,r12,r3
0033     bmsk    r12,r12,r2
0034     xor_s   r12,r12,r3
0035 #else /* BIG ENDIAN */
0036     sub3    r2,31,r2
0037     ; uses long immediate
0038         xor_s   r3,r3,r12
0039         bmsk    r3,r3,r2
0040         xor_s   r12,r12,r3
0041 #endif /* ENDIAN */
0042 .Last_store:
0043     j_s.d   [blink]
0044     st  r12,[r5,0]
0045
0046     .balign 4
0047 .Lcopy_bytewise:
0048     jcs [blink]
0049     ldb_s   r12,[r1,0]
0050     lsr.f   lp_count,r3
0051     bhs_s   .Lnox1
0052     stb.ab  r12,[r5,1]
0053     ldb.a   r12,[r1,1]
0054 .Lnox1:
0055     lppnz   .Lendbloop
0056     ldb_s   r3,[r1,1]
0057     stb.ab  r12,[r5,1]
0058     ldb.a   r12,[r1,2]
0059     stb.ab  r3,[r5,1]
0060 .Lendbloop:
0061     j_s.d   [blink]
0062     stb r12,[r5,0]
0063 END_CFI(memcpy)