From 1ce639990b6340a8b9f18d076c427fcf5a93695e Mon Sep 17 00:00:00 2001 From: Joern Rennecke Date: Fri, 13 Dec 2013 14:49:24 +0530 Subject: string: Add ARC support Signed-off-by: Joern Rennecke Signed-off-by: Vineet Gupta Signed-off-by: Bernhard Reutner-Fischer --- libc/string/arc/memcpy.S | 71 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 71 insertions(+) create mode 100644 libc/string/arc/memcpy.S (limited to 'libc/string/arc/memcpy.S') diff --git a/libc/string/arc/memcpy.S b/libc/string/arc/memcpy.S new file mode 100644 index 000000000..1c11951e4 --- /dev/null +++ b/libc/string/arc/memcpy.S @@ -0,0 +1,71 @@ +/* + * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com) + * Copyright (C) 2007 ARC International (UK) LTD + * + * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball. + */ + +#include + +/* This memcpy implementation does not support objects of 1GB or larger - + the check for alignment does not work then. */ +/* We assume that most sources and destinations are aligned, and + that also lengths are mostly a multiple of four, although to a lesser + extent. */ +ENTRY(memcpy) + or r3,r0,r1 + asl_s r3,r3,30 + mov_s r5,r0 + brls.d r2,r3,.Lcopy_bytewise + sub.f r3,r2,1 + ld_s r12,[r1,0] + asr.f lp_count,r3,3 + bbit0.d r3,2,.Lnox4 + bmsk_s r2,r2,1 + st.ab r12,[r5,4] + ld.a r12,[r1,4] +.Lnox4: + lppnz .Lendloop + ld_s r3,[r1,4] + st.ab r12,[r5,4] + ld.a r12,[r1,8] + st.ab r3,[r5,4] +.Lendloop: + breq r2,0,.Last_store + ld r3,[r5,0] +#ifdef __LITTLE_ENDIAN__ + add3 r2,-1,r2 + ; uses long immediate + xor_s r12,r12,r3 + bmsk r12,r12,r2 + xor_s r12,r12,r3 +#else /* BIG ENDIAN */ + sub3 r2,31,r2 + ; uses long immediate + xor_s r3,r3,r12 + bmsk r3,r3,r2 + xor_s r12,r12,r3 +#endif /* ENDIAN */ +.Last_store: + j_s.d [blink] + st r12,[r5,0] + + .balign 4 +.Lcopy_bytewise: + jcs [blink] + ldb_s r12,[r1,0] + lsr.f lp_count,r3 + bhs_s .Lnox1 + stb.ab r12,[r5,1] + ldb.a r12,[r1,1] +.Lnox1: + lppnz .Lendbloop + ldb_s r3,[r1,1] + stb.ab r12,[r5,1] + ldb.a r12,[r1,2] + stb.ab r3,[r5,1] +.Lendbloop: + j_s.d [blink] + stb r12,[r5,0] +END(memcpy) +libc_hidden_def(memcpy) -- cgit v1.2.3