| 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/memset.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 | #ifdef __ARCHS__ |
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| 39 | |
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| 40 | #define USE_PREFETCH |
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| 41 | |
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| 42 | #ifdef USE_PREFETCH |
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| 43 | #define PREWRITE(A,B) prefetchw [(A),(B)] |
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| 44 | #else |
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| 45 | #define PREWRITE(A,B) prealloc [(A),(B)] |
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| 46 | #endif |
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| 47 | |
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| 48 | ENTRY (memset) |
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| 49 | prefetchw [r0] ; Prefetch the write location |
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| 50 | mov.f 0, r2 |
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| 51 | ; if size is zero |
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| 52 | jz.d [blink] |
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| 53 | mov r3, r0 ; don't clobber ret val |
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| 54 | |
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| 55 | ; if length < 8 |
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| 56 | brls.d.nt r2, 8, .Lsmallchunk |
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| 57 | mov.f lp_count,r2 |
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| 58 | |
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| 59 | and.f r4, r0, 0x03 |
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| 60 | rsub lp_count, r4, 4 |
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| 61 | lpnz @.Laligndestination |
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| 62 | ; LOOP BEGIN |
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| 63 | stb.ab r1, [r3,1] |
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| 64 | sub r2, r2, 1 |
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| 65 | .Laligndestination: |
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| 66 | |
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| 67 | ; Destination is aligned |
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| 68 | and r1, r1, 0xFF |
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| 69 | asl r4, r1, 8 |
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| 70 | or r4, r4, r1 |
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| 71 | asl r5, r4, 16 |
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| 72 | or r5, r5, r4 |
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| 73 | mov r4, r5 |
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| 74 | |
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| 75 | sub3 lp_count, r2, 8 |
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| 76 | cmp r2, 64 |
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| 77 | bmsk.hi r2, r2, 5 |
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| 78 | mov.ls lp_count, 0 |
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| 79 | add3.hi r2, r2, 8 |
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| 80 | |
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| 81 | ; Convert len to Dwords, unfold x8 |
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| 82 | lsr.f lp_count, lp_count, 6 |
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| 83 | lpnz @.Lset64bytes |
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| 84 | ; LOOP START |
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| 85 | PREWRITE (r3, 64) ;Prefetch the next write location |
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| 86 | #ifdef __ARC_LL64__ |
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| 87 | std.ab r4, [r3, 8] |
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| 88 | std.ab r4, [r3, 8] |
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| 89 | std.ab r4, [r3, 8] |
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| 90 | std.ab r4, [r3, 8] |
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| 91 | std.ab r4, [r3, 8] |
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| 92 | std.ab r4, [r3, 8] |
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| 93 | std.ab r4, [r3, 8] |
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| 94 | std.ab r4, [r3, 8] |
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| 95 | #else |
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| 96 | st.ab r4, [r3, 4] |
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| 97 | st.ab r4, [r3, 4] |
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| 98 | st.ab r4, [r3, 4] |
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| 99 | st.ab r4, [r3, 4] |
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| 100 | st.ab r4, [r3, 4] |
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| 101 | st.ab r4, [r3, 4] |
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| 102 | st.ab r4, [r3, 4] |
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| 103 | st.ab r4, [r3, 4] |
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| 104 | st.ab r4, [r3, 4] |
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| 105 | st.ab r4, [r3, 4] |
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| 106 | st.ab r4, [r3, 4] |
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| 107 | st.ab r4, [r3, 4] |
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| 108 | st.ab r4, [r3, 4] |
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| 109 | st.ab r4, [r3, 4] |
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| 110 | st.ab r4, [r3, 4] |
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| 111 | st.ab r4, [r3, 4] |
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| 112 | #endif |
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| 113 | .Lset64bytes: |
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| 114 | |
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| 115 | lsr.f lp_count, r2, 5 ;Last remaining max 124 bytes |
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| 116 | lpnz .Lset32bytes |
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| 117 | ; LOOP START |
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| 118 | prefetchw [r3, 32] ;Prefetch the next write location |
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| 119 | #ifdef __ARC_LL64__ |
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| 120 | std.ab r4, [r3, 8] |
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| 121 | std.ab r4, [r3, 8] |
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| 122 | std.ab r4, [r3, 8] |
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| 123 | std.ab r4, [r3, 8] |
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| 124 | #else |
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| 125 | st.ab r4, [r3, 4] |
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| 126 | st.ab r4, [r3, 4] |
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| 127 | st.ab r4, [r3, 4] |
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| 128 | st.ab r4, [r3, 4] |
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| 129 | st.ab r4, [r3, 4] |
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| 130 | st.ab r4, [r3, 4] |
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| 131 | st.ab r4, [r3, 4] |
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| 132 | st.ab r4, [r3, 4] |
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| 133 | #endif |
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| 134 | .Lset32bytes: |
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| 135 | |
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| 136 | and.f lp_count, r2, 0x1F ;Last remaining 31 bytes |
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| 137 | .Lsmallchunk: |
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| 138 | lpnz .Lcopy3bytes |
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| 139 | ; LOOP START |
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| 140 | stb.ab r1, [r3, 1] |
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| 141 | .Lcopy3bytes: |
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| 142 | |
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| 143 | j [blink] |
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| 144 | |
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| 145 | ENDFUNC (memset) |
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| 146 | #endif /* __ARCHS__ */ |
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| 147 | |
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| 148 | #endif /* !__OPTIMIZE_SIZE__ && !PREFER_SIZE_OVER_SPEED */ |
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