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Diffstat (limited to 'newlib/libc/machine/arc/memcpy-bs.S')
| -rw-r--r-- | newlib/libc/machine/arc/memcpy-bs.S | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/newlib/libc/machine/arc/memcpy-bs.S b/newlib/libc/machine/arc/memcpy-bs.S new file mode 100644 index 0000000..8258094 --- /dev/null +++ b/newlib/libc/machine/arc/memcpy-bs.S @@ -0,0 +1,103 @@ +/* + Copyright (c) 2015, Synopsys, Inc. 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 notice, + this list of conditions and the following disclaimer in the documentation + and/or other materials provided with the distribution. + + 3) Neither the name of the Synopsys, Inc., nor the names of its contributors + may be used to endorse or promote products derived from this software + without specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + POSSIBILITY OF SUCH DAMAGE. +*/ + +/* This implementation is optimized for performance. For code size a generic + implementation of this function from newlib/libc/string/memcpy.c will be + used. */ +#if !defined (__OPTIMIZE_SIZE__) && !defined (PREFER_SIZE_OVER_SPEED) + +#include "asm.h" + +#if !defined (__ARC601__) && !defined (__HS__) && defined (__Xbarrel_shifter) +/* Mostly optimized for ARC700, but not bad for ARC600 either. */ +/* 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_l 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 + bcc_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] +ENDFUNC (memcpy) +#endif /* !__ARC601__ && !__HS__ && __Xbarrel_shifter */ + +#endif /* !__OPTIMIZE_SIZE__ && !PREFER_SIZE_OVER_SPEED */ |