[444] | 1 | /* |
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| 2 | Copyright (c) 2015, Synopsys, Inc. All rights reserved. |
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| 3 | |
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| 4 | Redistribution and use in source and binary forms, with or without |
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| 5 | modification, are permitted provided that the following conditions are met: |
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| 6 | |
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| 7 | 1) Redistributions of source code must retain the above copyright notice, |
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| 8 | this list of conditions and the following disclaimer. |
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| 9 | |
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| 10 | 2) Redistributions in binary form must reproduce the above copyright notice, |
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| 11 | this list of conditions and the following disclaimer in the documentation |
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| 12 | and/or other materials provided with the distribution. |
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| 13 | |
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| 14 | 3) Neither the name of the Synopsys, Inc., nor the names of its contributors |
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| 15 | may be used to endorse or promote products derived from this software |
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| 16 | without specific prior written permission. |
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| 17 | |
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| 18 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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| 19 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 20 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 21 | ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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| 22 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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| 23 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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| 24 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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| 25 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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| 26 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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| 27 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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| 28 | POSSIBILITY OF SUCH DAMAGE. |
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| 29 | */ |
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| 30 | |
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| 31 | /* This implementation is optimized for performance. For code size a generic |
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| 32 | implementation of this function from newlib/libc/string/memcpy.c will be |
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| 33 | used. */ |
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| 34 | #if !defined (__OPTIMIZE_SIZE__) && !defined (PREFER_SIZE_OVER_SPEED) |
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| 35 | |
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| 36 | #include "asm.h" |
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| 37 | |
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| 38 | #if !defined (__ARC601__) && !defined (__ARCHS__) \ |
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| 39 | && defined (__ARC_BARREL_SHIFTER__) |
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| 40 | |
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| 41 | /* Mostly optimized for ARC700, but not bad for ARC600 either. */ |
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| 42 | /* This memcpy implementation does not support objects of 1GB or larger - |
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| 43 | the check for alignment does not work then. */ |
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| 44 | /* We assume that most sources and destinations are aligned, and |
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| 45 | that also lengths are mostly a multiple of four, although to a lesser |
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| 46 | extent. */ |
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| 47 | ENTRY (memcpy) |
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| 48 | or r3,r0,r1 |
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| 49 | asl_s r3,r3,30 |
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| 50 | mov_s r5,r0 |
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| 51 | brls.d r2,r3,.Lcopy_bytewise |
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| 52 | sub.f r3,r2,1 |
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| 53 | ld_s r12,[r1,0] |
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| 54 | asr.f lp_count,r3,3 |
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| 55 | bbit0.d r3,2,.Lnox4 |
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| 56 | bmsk_s r2,r2,1 |
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| 57 | st.ab r12,[r5,4] |
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| 58 | ld.a r12,[r1,4] |
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| 59 | .Lnox4: |
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| 60 | lppnz .Lendloop |
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| 61 | ld_s r3,[r1,4] |
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| 62 | st.ab r12,[r5,4] |
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| 63 | ld.a r12,[r1,8] |
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| 64 | st.ab r3,[r5,4] |
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| 65 | .Lendloop: |
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| 66 | breq_l r2,0,.Last_store |
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| 67 | ld r3,[r5,0] |
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| 68 | #ifdef __LITTLE_ENDIAN__ |
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| 69 | add3 r2,-1,r2 |
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| 70 | ; uses long immediate |
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| 71 | xor_s r12,r12,r3 |
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| 72 | bmsk r12,r12,r2 |
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| 73 | xor_s r12,r12,r3 |
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| 74 | #else /* BIG ENDIAN */ |
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| 75 | sub3 r2,31,r2 |
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| 76 | ; uses long immediate |
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| 77 | xor_s r3,r3,r12 |
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| 78 | bmsk r3,r3,r2 |
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| 79 | xor_s r12,r12,r3 |
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| 80 | #endif /* ENDIAN */ |
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| 81 | .Last_store: |
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| 82 | j_s.d [blink] |
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| 83 | st r12,[r5,0] |
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| 84 | |
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| 85 | .balign 4 |
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| 86 | .Lcopy_bytewise: |
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| 87 | jcs [blink] |
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| 88 | ldb_s r12,[r1,0] |
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| 89 | lsr.f lp_count,r3 |
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| 90 | bcc_s .Lnox1 |
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| 91 | stb.ab r12,[r5,1] |
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| 92 | ldb.a r12,[r1,1] |
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| 93 | .Lnox1: |
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| 94 | lppnz .Lendbloop |
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| 95 | ldb_s r3,[r1,1] |
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| 96 | stb.ab r12,[r5,1] |
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| 97 | ldb.a r12,[r1,2] |
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| 98 | stb.ab r3,[r5,1] |
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| 99 | .Lendbloop: |
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| 100 | j_s.d [blink] |
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| 101 | stb r12,[r5,0] |
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| 102 | ENDFUNC (memcpy) |
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| 103 | #endif /* !__ARC601__ && !__ARCHS__ && __ARC_BARREL_SHIFTER__ */ |
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| 104 | |
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| 105 | #endif /* !__OPTIMIZE_SIZE__ && !PREFER_SIZE_OVER_SPEED */ |
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