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| /* SPDX-License-Identifier: GPL-2.0+ */
| /*
| * ARCv2 memcpy implementation optimized for unaligned memory access using.
| *
| * Copyright (C) 2019 Synopsys
| * Author: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
| */
|
| #include <linux/linkage.h>
|
| #ifdef CONFIG_ARC_HAS_LL64
| # 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 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_CFI(memcpy)
| mov r3, r0 ; don;t clobber ret val
|
| lsr.f lp_count, r2, ZOLSHFT
| lpnz @.Lcopy32_64bytes
| ;; LOOP START
| LOADX (r6, r1)
| 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
| lpnz @.Lcopyremainingbytes
| ;; LOOP START
| ldb.ab r5, [r1, 1]
| stb.ab r5, [r3, 1]
| .Lcopyremainingbytes:
|
| j [blink]
| END_CFI(memcpy)
|
|
