1/* 2 Copyright (c) 2015, Synopsys, Inc. All rights reserved. 3 4 Redistribution and use in source and binary forms, with or without 5 modification, are permitted provided that the following conditions are met: 6 7 1) Redistributions of source code must retain the above copyright notice, 8 this list of conditions and the following disclaimer. 9 10 2) Redistributions in binary form must reproduce the above copyright notice, 11 this list of conditions and the following disclaimer in the documentation 12 and/or other materials provided with the distribution. 13 14 3) Neither the name of the Synopsys, Inc., nor the names of its contributors 15 may be used to endorse or promote products derived from this software 16 without specific prior written permission. 17 18 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 19 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 22 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 POSSIBILITY OF SUCH DAMAGE. 29*/ 30 31/* This implementation is optimized for performance. For code size a generic 32 implementation of this function from newlib/libc/string/memset.c will be 33 used. */ 34#if !defined (__OPTIMIZE_SIZE__) && !defined (PREFER_SIZE_OVER_SPEED) 35 36#include "asm.h" 37 38#ifdef __ARCHS__ 39 40#define USE_PREFETCH 41 42#ifdef USE_PREFETCH 43#define PREWRITE(A,B) prefetchw [(A),(B)] 44#else 45#define PREWRITE(A,B) prealloc [(A),(B)] 46#endif 47 48ENTRY (memset) 49 prefetchw [r0] ; Prefetch the write location 50 mov.f 0, r2 51; if size is zero 52 jz.d [blink] 53 mov r3, r0 ; don't clobber ret val 54 55; if length < 8 56 brls.d.nt r2, 8, .Lsmallchunk 57 mov.f lp_count,r2 58 59 and.f r4, r0, 0x03 60 rsub lp_count, r4, 4 61 lpnz @.Laligndestination 62 ; LOOP BEGIN 63 stb.ab r1, [r3,1] 64 sub r2, r2, 1 65.Laligndestination: 66 67; Destination is aligned 68 and r1, r1, 0xFF 69 asl r4, r1, 8 70 or r4, r4, r1 71 asl r5, r4, 16 72 or r5, r5, r4 73 mov r4, r5 74 75 sub3 lp_count, r2, 8 76 cmp r2, 64 77 bmsk.hi r2, r2, 5 78 mov.ls lp_count, 0 79 add3.hi r2, r2, 8 80 81; Convert len to Dwords, unfold x8 82 lsr.f lp_count, lp_count, 6 83 lpnz @.Lset64bytes 84 ; LOOP START 85 PREWRITE (r3, 64) ;Prefetch the next write location 86#ifdef __ARC_LL64__ 87 std.ab r4, [r3, 8] 88 std.ab r4, [r3, 8] 89 std.ab r4, [r3, 8] 90 std.ab r4, [r3, 8] 91 std.ab r4, [r3, 8] 92 std.ab r4, [r3, 8] 93 std.ab r4, [r3, 8] 94 std.ab r4, [r3, 8] 95#else 96 st.ab r4, [r3, 4] 97 st.ab r4, [r3, 4] 98 st.ab r4, [r3, 4] 99 st.ab r4, [r3, 4] 100 st.ab r4, [r3, 4] 101 st.ab r4, [r3, 4] 102 st.ab r4, [r3, 4] 103 st.ab r4, [r3, 4] 104 st.ab r4, [r3, 4] 105 st.ab r4, [r3, 4] 106 st.ab r4, [r3, 4] 107 st.ab r4, [r3, 4] 108 st.ab r4, [r3, 4] 109 st.ab r4, [r3, 4] 110 st.ab r4, [r3, 4] 111 st.ab r4, [r3, 4] 112#endif 113.Lset64bytes: 114 115 lsr.f lp_count, r2, 5 ;Last remaining max 124 bytes 116 lpnz .Lset32bytes 117 ; LOOP START 118 prefetchw [r3, 32] ;Prefetch the next write location 119#ifdef __ARC_LL64__ 120 std.ab r4, [r3, 8] 121 std.ab r4, [r3, 8] 122 std.ab r4, [r3, 8] 123 std.ab r4, [r3, 8] 124#else 125 st.ab r4, [r3, 4] 126 st.ab r4, [r3, 4] 127 st.ab r4, [r3, 4] 128 st.ab r4, [r3, 4] 129 st.ab r4, [r3, 4] 130 st.ab r4, [r3, 4] 131 st.ab r4, [r3, 4] 132 st.ab r4, [r3, 4] 133#endif 134.Lset32bytes: 135 136 and.f lp_count, r2, 0x1F ;Last remaining 31 bytes 137.Lsmallchunk: 138 lpnz .Lcopy3bytes 139 ; LOOP START 140 stb.ab r1, [r3, 1] 141.Lcopy3bytes: 142 143 j [blink] 144 145ENDFUNC (memset) 146#endif /* __ARCHS__ */ 147 148#endif /* !__OPTIMIZE_SIZE__ && !PREFER_SIZE_OVER_SPEED */ 149