| /* |
| * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| /* If dst and src are 4 byte aligned, copy 8 bytes at a time. |
| If the src is 4, but not 8 byte aligned, we first read 4 bytes to get |
| it 8 byte aligned. Thus, we can do a little read-ahead, without |
| dereferencing a cache line that we should not touch. |
| Note that short and long instructions have been scheduled to avoid |
| branch stalls. |
| The beq_s to r3z could be made unaligned & long to avoid a stall |
| there, but the it is not likely to be taken often, and it |
| would also be likey to cost an unaligned mispredict at the next call. */ |
| |
| #include <linux/linkage.h> |
| |
| ENTRY(strcpy) |
| or r2,r0,r1 |
| bmsk_s r2,r2,1 |
| brne.d r2,0,charloop |
| mov_s r10,r0 |
| ld_s r3,[r1,0] |
| mov r8,0x01010101 |
| bbit0.d r1,2,loop_start |
| ror r12,r8 |
| sub r2,r3,r8 |
| bic_s r2,r2,r3 |
| tst_s r2,r12 |
| bne r3z |
| mov_s r4,r3 |
| .balign 4 |
| loop: |
| ld.a r3,[r1,4] |
| st.ab r4,[r10,4] |
| loop_start: |
| ld.a r4,[r1,4] |
| sub r2,r3,r8 |
| bic_s r2,r2,r3 |
| tst_s r2,r12 |
| bne_s r3z |
| st.ab r3,[r10,4] |
| sub r2,r4,r8 |
| bic r2,r2,r4 |
| tst r2,r12 |
| beq loop |
| mov_s r3,r4 |
| #ifdef __LITTLE_ENDIAN__ |
| r3z: bmsk.f r1,r3,7 |
| lsr_s r3,r3,8 |
| #else |
| r3z: lsr.f r1,r3,24 |
| asl_s r3,r3,8 |
| #endif |
| bne.d r3z |
| stb.ab r1,[r10,1] |
| j_s [blink] |
| |
| .balign 4 |
| charloop: |
| ldb.ab r3,[r1,1] |
| |
| |
| brne.d r3,0,charloop |
| stb.ab r3,[r10,1] |
| j [blink] |
| END(strcpy) |
