arch/arc/lib/memcpy-700.S

   1 /*
   2  * Copyright (C) 2004, 2007-2010, 2011-2014 Synopsys, Inc. All rights reserved.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 .global memcpy
   8 .align 4
   9 memcpy:
  10         or      %r3, %r0, %r1
  11         asl_s   %r3, %r3, 30
  12         mov_s   %r5, %r0
  13         brls.d  %r2, %r3, .Lcopy_bytewise
  14         sub.f   %r3, %r2, 1
  15         ld_s    %r12, [%r1, 0]
  16         asr.f   %lp_count, %r3, 3
  17         bbit0.d %r3, 2, .Lnox4
  18         bmsk_s  %r2, %r2, 1
  19         st.ab   %r12, [%r5, 4]
  20         ld.a    %r12, [%r1, 4]
  21 .Lnox4:
  22         lppnz   .Lendloop
  23         ld_s    %r3, [%r1, 4]
  24         st.ab   %r12, [%r5, 4]
  25         ld.a    %r12, [%r1, 8]
  26         st.ab   %r3, [%r5, 4]
  27 .Lendloop:
  28         breq    %r2, 0, .Last_store
  29         ld      %r3, [%r5, 0]
  30 #ifdef __LITTLE_ENDIAN__
  31         add3    %r2, -1, %r2
  32         /* uses long immediate */
  33         xor_s   %r12, %r12, %r3
  34         bmsk    %r12, %r12, %r2
  35         xor_s   %r12, %r12, %r3
  36 #else /* __BIG_ENDIAN__ */
  37         sub3    %r2, 31, %r2
  38         /* uses long immediate */
  39         xor_s   %r3, %r3, %r12
  40         bmsk    %r3, %r3, %r2
  41         xor_s   %r12, %r12, %r3
  42 #endif /* _ENDIAN__ */
  43 .Last_store:
  44         j_s.d   [%blink]
  45         st      %r12, [%r5, 0]
  46
  47         .balign 4
  48 .Lcopy_bytewise:
  49         jcs     [%blink]
  50         ldb_s   %r12, [%r1, 0]
  51         lsr.f   %lp_count, %r3
  52         bhs_s   .Lnox1
  53         stb.ab  %r12, [%r5, 1]
  54         ldb.a   %r12, [%r1, 1]
  55 .Lnox1:
  56         lppnz   .Lendbloop
  57         ldb_s   %r3, [%r1, 1]
  58         stb.ab  %r12, [%r5, 1]
  59         ldb.a   %r12, [%r1, 2]
  60         stb.ab  %r3, [%r5, 1]
  61 .Lendbloop:
  62         j_s.d   [%blink]
  63         stb     %r12, [%r5, 0]