arch/arc/lib/memcpy-700.S

   1 /*
   2  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #include <linux/linkage.h>
  10
  11 ENTRY(memcpy)
  12         or      r3,r0,r1
  13         asl_s   r3,r3,30
  14         mov_s   r5,r0
  15         brls.d  r2,r3,.Lcopy_bytewise
  16         sub.f   r3,r2,1
  17         ld_s    r12,[r1,0]
  18         asr.f   lp_count,r3,3
  19         bbit0.d r3,2,.Lnox4
  20         bmsk_s  r2,r2,1
  21         st.ab   r12,[r5,4]
  22         ld.a    r12,[r1,4]
  23 .Lnox4:
  24         lppnz   .Lendloop
  25         ld_s    r3,[r1,4]
  26         st.ab   r12,[r5,4]
  27         ld.a    r12,[r1,8]
  28         st.ab   r3,[r5,4]
  29 .Lendloop:
  30         breq    r2,0,.Last_store
  31         ld      r3,[r5,0]
  32 #ifdef __LITTLE_ENDIAN__
  33         add3    r2,-1,r2
  34         ; uses long immediate
  35         xor_s   r12,r12,r3
  36         bmsk    r12,r12,r2
  37     xor_s       r12,r12,r3
  38 #else /* BIG ENDIAN */
  39         sub3    r2,31,r2
  40         ; uses long immediate
  41         xor_s   r3,r3,r12
  42         bmsk    r3,r3,r2
  43         xor_s   r12,r12,r3
  44 #endif /* ENDIAN */
  45 .Last_store:
  46         j_s.d   [blink]
  47         st      r12,[r5,0]
  48
  49         .balign 4
  50 .Lcopy_bytewise:
  51         jcs     [blink]
  52         ldb_s   r12,[r1,0]
  53         lsr.f   lp_count,r3
  54         bhs_s   .Lnox1
  55         stb.ab  r12,[r5,1]
  56         ldb.a   r12,[r1,1]
  57 .Lnox1:
  58         lppnz   .Lendbloop
  59         ldb_s   r3,[r1,1]
  60         stb.ab  r12,[r5,1]
  61         ldb.a   r12,[r1,2]
  62         stb.ab  r3,[r5,1]
  63 .Lendbloop:
  64         j_s.d   [blink]
  65         stb     r12,[r5,0]
  66 END(memcpy)