1/* 2 Copyright (c) 2015-2024, 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#include <picolibc.h> 35 36#if !defined (__OPTIMIZE_SIZE__) && !defined (PREFER_SIZE_OVER_SPEED) \ 37 && !defined (__ARC_RF16__) 38 39#include "asm.h" 40 41#ifdef __ARCHS__ 42 43#define USE_PREFETCH 44 45#ifdef USE_PREFETCH 46#define PREWRITE(A,B) prefetchw [(A),(B)] 47#else 48#define PREWRITE(A,B) prealloc [(A),(B)] 49#endif 50 51ENTRY (memset) 52 prefetchw [r0] ; Prefetch the write location 53 mov.f 0, r2 54; if size is zero 55 jz.d [blink] 56 mov r3, r0 ; don't clobber ret val 57 58; if length < 8 59 brls.d.nt r2, 8, .Lsmallchunk 60 mov.f lp_count,r2 61 62 and.f r4, r0, 0x03 63 rsub lp_count, r4, 4 64 lpnz @.Laligndestination 65 ; LOOP BEGIN 66 stb.ab r1, [r3,1] 67 sub r2, r2, 1 68.Laligndestination: 69 70; Destination is aligned 71 and r1, r1, 0xFF 72 asl r4, r1, 8 73 or r4, r4, r1 74 asl r5, r4, 16 75 or r5, r5, r4 76 mov r4, r5 77 78 sub3 lp_count, r2, 8 79 cmp r2, 64 80 bmsk.hi r2, r2, 5 81 mov.ls lp_count, 0 82 add3.hi r2, r2, 8 83 84; Convert len to Dwords, unfold x8 85 lsr.f lp_count, lp_count, 6 86 lpnz @.Lset64bytes 87 ; LOOP START 88 PREWRITE (r3, 64) ;Prefetch the next write location 89#ifdef __ARC_LL64__ 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 std.ab r4, [r3, 8] 96 std.ab r4, [r3, 8] 97 std.ab r4, [r3, 8] 98#else 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 st.ab r4, [r3, 4] 113 st.ab r4, [r3, 4] 114 st.ab r4, [r3, 4] 115#endif 116.Lset64bytes: 117 118 lsr.f lp_count, r2, 5 ;Last remaining max 124 bytes 119 lpnz .Lset32bytes 120 ; LOOP START 121 prefetchw [r3, 32] ;Prefetch the next write location 122#ifdef __ARC_LL64__ 123 std.ab r4, [r3, 8] 124 std.ab r4, [r3, 8] 125 std.ab r4, [r3, 8] 126 std.ab r4, [r3, 8] 127#else 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 st.ab r4, [r3, 4] 134 st.ab r4, [r3, 4] 135 st.ab r4, [r3, 4] 136#endif 137.Lset32bytes: 138 139 and.f lp_count, r2, 0x1F ;Last remaining 31 bytes 140.Lsmallchunk: 141 lpnz .Lcopy3bytes 142 ; LOOP START 143 stb.ab r1, [r3, 1] 144.Lcopy3bytes: 145 146 j [blink] 147 148ENDFUNC (memset) 149#endif /* __ARCHS__ */ 150 151#endif /* !__OPTIMIZE_SIZE__ && !PREFER_SIZE_OVER_SPEED */ 152
