| 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/strcpy.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 (__ARC600__) && defined (__ARC_BARREL_SHIFTER__) |
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| 39 | /* If dst and src are 4 byte aligned, copy 8 bytes at a time. |
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| 40 | If the src is 4, but not 8 byte aligned, we first read 4 bytes to get |
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| 41 | it 8 byte aligned. Thus, we can do a little read-ahead, without |
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| 42 | dereferencing a cache line that we should not touch. |
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| 43 | Note that short and long instructions have been scheduled to avoid |
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| 44 | branch stalls. |
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| 45 | This version is optimized for the ARC600 pipeline. */ |
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| 46 | |
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| 47 | ENTRY (strcpy) |
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| 48 | or r2,r0,r1 |
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| 49 | bmsk.f 0,r2,1 |
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| 50 | mov r8,0x01010101 |
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| 51 | bne.d .Lcharloop |
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| 52 | mov_s r10,r0 |
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| 53 | ld_l r3,[r1,0] |
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| 54 | bbit0.d r1,2,.Loop_setup |
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| 55 | ror r12,r8 |
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| 56 | sub r2,r3,r8 |
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| 57 | bic_s r2,r2,r3 |
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| 58 | and_s r2,r2,r12 |
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| 59 | brne_s r2,0,.Lr3z |
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| 60 | st.ab r3,[r10,4] |
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| 61 | ld.a r3,[r1,4] |
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| 62 | .Loop_setup: |
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| 63 | ld.a r4,[r1,4] |
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| 64 | |
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| 65 | sub r2,r3,r8 |
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| 66 | and.f r2,r2,r12 |
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| 67 | sub r5,r4,r8 |
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| 68 | and.eq.f r5,r5,r12 |
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| 69 | b.d .Loop_start |
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| 70 | mov_s r6,r3 |
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| 71 | .balign 4 |
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| 72 | .Loop: |
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| 73 | ld.a r3,[r1,4] |
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| 74 | st r4,[r10,4] |
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| 75 | ld.a r4,[r1,4] |
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| 76 | sub r2,r3,r8 |
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| 77 | and.f r2,r2,r12 |
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| 78 | sub r5,r4,r8 |
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| 79 | and.eq.f r5,r5,r12 |
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| 80 | st.ab r6,[r10,8] |
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| 81 | mov r6,r3 |
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| 82 | .Loop_start: |
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| 83 | beq.d .Loop |
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| 84 | bic_s r2,r2,r3 |
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| 85 | brne.d r2,0,.Lr3z |
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| 86 | and r5,r5,r12 |
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| 87 | bic r5,r5,r4 |
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| 88 | breq.d r5,0,.Loop |
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| 89 | mov_s r3,r4 |
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| 90 | st.ab r6,[r10,4] |
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| 91 | #ifdef __LITTLE_ENDIAN__ |
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| 92 | .Lr3z: bmsk.f r1,r3,7 |
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| 93 | .Lr3z_loop: |
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| 94 | lsr_s r3,r3,8 |
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| 95 | stb.ab r1,[r10,1] |
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| 96 | bne.d .Lr3z_loop |
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| 97 | bmsk.f r1,r3,7 |
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| 98 | j_s [blink] |
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| 99 | #else |
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| 100 | .Lr3z: lsr.f r1,r3,24 |
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| 101 | .Lr3z_loop: |
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| 102 | asl_s r3,r3,8 |
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| 103 | stb.ab r1,[r10,1] |
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| 104 | bne.d .Lr3z_loop |
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| 105 | lsr.f r1,r3,24 |
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| 106 | j_s [blink] |
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| 107 | #endif |
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| 108 | |
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| 109 | .balign 4 |
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| 110 | .Lcharloop: |
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| 111 | ldb.ab r3,[r1,1] |
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| 112 | |
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| 113 | |
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| 114 | brne.d r3,0,.Lcharloop |
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| 115 | stb.ab r3,[r10,1] |
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| 116 | j [blink] |
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| 117 | ENDFUNC (strcpy) |
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| 118 | #endif /* __ARC600__ && __ARC_BARREL_SHIFTER__ */ |
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| 119 | |
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| 120 | #endif /* !__OPTIMIZE_SIZE__ && !PREFER_SIZE_OVER_SPEED */ |
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