104 lines
3.2 KiB
ArmAsm
104 lines
3.2 KiB
ArmAsm
/*
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Copyright (c) 2015, Synopsys, Inc. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1) Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2) Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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3) Neither the name of the Synopsys, Inc., nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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/* This implementation is optimized for performance. For code size a generic
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implementation of this function from newlib/libc/string/memcpy.c will be
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used. */
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#if !defined (__OPTIMIZE_SIZE__) && !defined (PREFER_SIZE_OVER_SPEED)
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#include "asm.h"
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#if !defined (__ARC601__) && !defined (__HS__) && defined (__Xbarrel_shifter)
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/* Mostly optimized for ARC700, but not bad for ARC600 either. */
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/* This memcpy implementation does not support objects of 1GB or larger -
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the check for alignment does not work then. */
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/* We assume that most sources and destinations are aligned, and
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that also lengths are mostly a multiple of four, although to a lesser
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extent. */
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ENTRY (memcpy)
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or r3,r0,r1
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asl_s r3,r3,30
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mov_s r5,r0
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brls.d r2,r3,.Lcopy_bytewise
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sub.f r3,r2,1
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ld_s r12,[r1,0]
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asr.f lp_count,r3,3
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bbit0.d r3,2,.Lnox4
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bmsk_s r2,r2,1
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st.ab r12,[r5,4]
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ld.a r12,[r1,4]
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.Lnox4:
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lppnz .Lendloop
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ld_s r3,[r1,4]
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st.ab r12,[r5,4]
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ld.a r12,[r1,8]
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st.ab r3,[r5,4]
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.Lendloop:
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breq_l r2,0,.Last_store
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ld r3,[r5,0]
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#ifdef __LITTLE_ENDIAN__
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add3 r2,-1,r2
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; uses long immediate
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xor_s r12,r12,r3
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bmsk r12,r12,r2
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xor_s r12,r12,r3
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#else /* BIG ENDIAN */
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sub3 r2,31,r2
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; uses long immediate
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xor_s r3,r3,r12
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bmsk r3,r3,r2
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xor_s r12,r12,r3
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#endif /* ENDIAN */
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.Last_store:
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j_s.d [blink]
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st r12,[r5,0]
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.balign 4
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.Lcopy_bytewise:
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jcs [blink]
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ldb_s r12,[r1,0]
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lsr.f lp_count,r3
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bcc_s .Lnox1
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stb.ab r12,[r5,1]
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ldb.a r12,[r1,1]
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.Lnox1:
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lppnz .Lendbloop
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ldb_s r3,[r1,1]
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stb.ab r12,[r5,1]
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ldb.a r12,[r1,2]
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stb.ab r3,[r5,1]
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.Lendbloop:
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j_s.d [blink]
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stb r12,[r5,0]
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ENDFUNC (memcpy)
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#endif /* !__ARC601__ && !__HS__ && __Xbarrel_shifter */
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#endif /* !__OPTIMIZE_SIZE__ && !PREFER_SIZE_OVER_SPEED */
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