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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 | /* * Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/linkage.h> #ifdef __LITTLE_ENDIAN__ # define SHIFT_1(RX,RY,IMM) asl RX, RY, IMM ; << # define SHIFT_2(RX,RY,IMM) lsr RX, RY, IMM ; >> # define MERGE_1(RX,RY,IMM) asl RX, RY, IMM # define MERGE_2(RX,RY,IMM) # define EXTRACT_1(RX,RY,IMM) and RX, RY, 0xFFFF # define EXTRACT_2(RX,RY,IMM) lsr RX, RY, IMM #else # define SHIFT_1(RX,RY,IMM) lsr RX, RY, IMM ; >> # define SHIFT_2(RX,RY,IMM) asl RX, RY, IMM ; << # define MERGE_1(RX,RY,IMM) asl RX, RY, IMM ; << # define MERGE_2(RX,RY,IMM) asl RX, RY, IMM ; << # define EXTRACT_1(RX,RY,IMM) lsr RX, RY, IMM # define EXTRACT_2(RX,RY,IMM) lsr RX, RY, 0x08 #endif #ifdef CONFIG_ARC_HAS_LL64 # define PREFETCH_READ(RX) prefetch [RX, 56] # define PREFETCH_WRITE(RX) prefetchw [RX, 64] # define LOADX(DST,RX) ldd.ab DST, [RX, 8] # define STOREX(SRC,RX) std.ab SRC, [RX, 8] # define ZOLSHFT 5 # define ZOLAND 0x1F #else # define PREFETCH_READ(RX) prefetch [RX, 28] # define PREFETCH_WRITE(RX) prefetchw [RX, 32] # define LOADX(DST,RX) ld.ab DST, [RX, 4] # define STOREX(SRC,RX) st.ab SRC, [RX, 4] # define ZOLSHFT 4 # define ZOLAND 0xF #endif ENTRY(memcpy) prefetch [r1] ; Prefetch the read location prefetchw [r0] ; Prefetch the write location mov.f 0, r2 ;;; if size is zero jz.d [blink] mov r3, r0 ; don;t clobber ret val ;;; if size <= 8 cmp r2, 8 bls.d @.Lsmallchunk mov.f lp_count, r2 and.f r4, r0, 0x03 rsub lp_count, r4, 4 lpnz @.Laligndestination ;; LOOP BEGIN ldb.ab r5, [r1,1] sub r2, r2, 1 stb.ab r5, [r3,1] .Laligndestination: ;;; Check the alignment of the source and.f r4, r1, 0x03 bnz.d @.Lsourceunaligned ;;; CASE 0: Both source and destination are 32bit aligned ;;; Convert len to Dwords, unfold x4 lsr.f lp_count, r2, ZOLSHFT lpnz @.Lcopy32_64bytes ;; LOOP START LOADX (r6, r1) PREFETCH_READ (r1) PREFETCH_WRITE (r3) LOADX (r8, r1) LOADX (r10, r1) LOADX (r4, r1) STOREX (r6, r3) STOREX (r8, r3) STOREX (r10, r3) STOREX (r4, r3) .Lcopy32_64bytes: and.f lp_count, r2, ZOLAND ;Last remaining 31 bytes .Lsmallchunk: lpnz @.Lcopyremainingbytes ;; LOOP START ldb.ab r5, [r1,1] stb.ab r5, [r3,1] .Lcopyremainingbytes: j [blink] ;;; END CASE 0 .Lsourceunaligned: cmp r4, 2 beq.d @.LunalignedOffby2 sub r2, r2, 1 bhi.d @.LunalignedOffby3 ldb.ab r5, [r1, 1] ;;; CASE 1: The source is unaligned, off by 1 ;; Hence I need to read 1 byte for a 16bit alignment ;; and 2bytes to reach 32bit alignment ldh.ab r6, [r1, 2] sub r2, r2, 2 ;; Convert to words, unfold x2 lsr.f lp_count, r2, 3 MERGE_1 (r6, r6, 8) MERGE_2 (r5, r5, 24) or r5, r5, r6 ;; Both src and dst are aligned lpnz @.Lcopy8bytes_1 ;; LOOP START ld.ab r6, [r1, 4] prefetch [r1, 28] ;Prefetch the next read location ld.ab r8, [r1,4] prefetchw [r3, 32] ;Prefetch the next write location SHIFT_1 (r7, r6, 24) or r7, r7, r5 SHIFT_2 (r5, r6, 8) SHIFT_1 (r9, r8, 24) or r9, r9, r5 SHIFT_2 (r5, r8, 8) st.ab r7, [r3, 4] st.ab r9, [r3, 4] .Lcopy8bytes_1: ;; Write back the remaining 16bits EXTRACT_1 (r6, r5, 16) sth.ab r6, [r3, 2] ;; Write back the remaining 8bits EXTRACT_2 (r5, r5, 16) stb.ab r5, [r3, 1] and.f lp_count, r2, 0x07 ;Last 8bytes lpnz @.Lcopybytewise_1 ;; LOOP START ldb.ab r6, [r1,1] stb.ab r6, [r3,1] .Lcopybytewise_1: j [blink] .LunalignedOffby2: ;;; CASE 2: The source is unaligned, off by 2 ldh.ab r5, [r1, 2] sub r2, r2, 1 ;; Both src and dst are aligned ;; Convert to words, unfold x2 lsr.f lp_count, r2, 3 #ifdef __BIG_ENDIAN__ asl.nz r5, r5, 16 #endif lpnz @.Lcopy8bytes_2 ;; LOOP START ld.ab r6, [r1, 4] prefetch [r1, 28] ;Prefetch the next read location ld.ab r8, [r1,4] prefetchw [r3, 32] ;Prefetch the next write location SHIFT_1 (r7, r6, 16) or r7, r7, r5 SHIFT_2 (r5, r6, 16) SHIFT_1 (r9, r8, 16) or r9, r9, r5 SHIFT_2 (r5, r8, 16) st.ab r7, [r3, 4] st.ab r9, [r3, 4] .Lcopy8bytes_2: #ifdef __BIG_ENDIAN__ lsr.nz r5, r5, 16 #endif sth.ab r5, [r3, 2] and.f lp_count, r2, 0x07 ;Last 8bytes lpnz @.Lcopybytewise_2 ;; LOOP START ldb.ab r6, [r1,1] stb.ab r6, [r3,1] .Lcopybytewise_2: j [blink] .LunalignedOffby3: ;;; CASE 3: The source is unaligned, off by 3 ;;; Hence, I need to read 1byte for achieve the 32bit alignment ;; Both src and dst are aligned ;; Convert to words, unfold x2 lsr.f lp_count, r2, 3 #ifdef __BIG_ENDIAN__ asl.ne r5, r5, 24 #endif lpnz @.Lcopy8bytes_3 ;; LOOP START ld.ab r6, [r1, 4] prefetch [r1, 28] ;Prefetch the next read location ld.ab r8, [r1,4] prefetchw [r3, 32] ;Prefetch the next write location SHIFT_1 (r7, r6, 8) or r7, r7, r5 SHIFT_2 (r5, r6, 24) SHIFT_1 (r9, r8, 8) or r9, r9, r5 SHIFT_2 (r5, r8, 24) st.ab r7, [r3, 4] st.ab r9, [r3, 4] .Lcopy8bytes_3: #ifdef __BIG_ENDIAN__ lsr.nz r5, r5, 24 #endif stb.ab r5, [r3, 1] and.f lp_count, r2, 0x07 ;Last 8bytes lpnz @.Lcopybytewise_3 ;; LOOP START ldb.ab r6, [r1,1] stb.ab r6, [r3,1] .Lcopybytewise_3: j [blink] END(memcpy) |