Condition itet ARM instruction in strcpy.c on thumb2 mode

newlib/libc/machine/arm/strcpy.c

 /*
  * Copyright (c) 2008 ARM Ltd
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 124 matching lines @@
        "tst     r2, #0xff00\n\t"
        "iteet   ne\n\t"
        SFI_BREG (ip)
        "strneh  r2, [ip], #2\n\t"
        "lsreq   r2, r2, #8\n\t"
        SFI_BREG (ip)
        "streqb  r2, [ip]\n\t"
        "tstne   r2, #0xff\n\t"
 #else
        "tst     r2, #0xff\n\t"
+#ifdef __thumb2__

[JF, 2014/12/16 17:17:00]

This should be the same guard as SFI_BREG, since it's not broken for Thumb or
ARM, but just when the extra SFI instructions are thrown in.

[Derek Schuff, 2014/12/16 18:44:34]

Done.

        "itet    ne\n\t"
+#endif
        SFI_BREG (ip)
        "strneh  r2, [ip], #2\n\t"
        SFI_BREG (ip)
        "streqb  r2, [ip]\n\t"
        "tstne   r2, #0xff00\n\t"
 #endif
        "bne     5b\n\t"
        "RETURN\n"
 
        /* src and dst do not have a common word-alignement.  Fall back to
@@ skipping 25 matching lines @@
        "add     r1, r1, #1\n\t"
        SFI_BREG (r3)
        "strb    r2, [r3]\n\t"
        "add     r3, r3, #1\n\t"
        "cmp     r2, #0\n\t"
        "bne     1b\n\t"
        "RETURN"
 #endif
        );
 }