236 lines
5 KiB
ArmAsm
236 lines
5 KiB
ArmAsm
/*
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* Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/linkage.h>
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#ifdef __LITTLE_ENDIAN__
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# define SHIFT_1(RX,RY,IMM) asl RX, RY, IMM ; <<
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# define SHIFT_2(RX,RY,IMM) lsr RX, RY, IMM ; >>
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# define MERGE_1(RX,RY,IMM) asl RX, RY, IMM
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# define MERGE_2(RX,RY,IMM)
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# define EXTRACT_1(RX,RY,IMM) and RX, RY, 0xFFFF
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# define EXTRACT_2(RX,RY,IMM) lsr RX, RY, IMM
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#else
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# define SHIFT_1(RX,RY,IMM) lsr RX, RY, IMM ; >>
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# define SHIFT_2(RX,RY,IMM) asl RX, RY, IMM ; <<
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# define MERGE_1(RX,RY,IMM) asl RX, RY, IMM ; <<
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# define MERGE_2(RX,RY,IMM) asl RX, RY, IMM ; <<
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# define EXTRACT_1(RX,RY,IMM) lsr RX, RY, IMM
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# define EXTRACT_2(RX,RY,IMM) lsr RX, RY, 0x08
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#endif
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#ifdef CONFIG_ARC_HAS_LL64
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# define PREFETCH_READ(RX) prefetch [RX, 56]
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# define PREFETCH_WRITE(RX) prefetchw [RX, 64]
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# define LOADX(DST,RX) ldd.ab DST, [RX, 8]
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# define STOREX(SRC,RX) std.ab SRC, [RX, 8]
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# define ZOLSHFT 5
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# define ZOLAND 0x1F
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#else
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# define PREFETCH_READ(RX) prefetch [RX, 28]
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# define PREFETCH_WRITE(RX) prefetchw [RX, 32]
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# define LOADX(DST,RX) ld.ab DST, [RX, 4]
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# define STOREX(SRC,RX) st.ab SRC, [RX, 4]
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# define ZOLSHFT 4
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# define ZOLAND 0xF
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#endif
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ENTRY(memcpy)
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prefetch [r1] ; Prefetch the read location
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prefetchw [r0] ; Prefetch the write location
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mov.f 0, r2
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;;; if size is zero
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jz.d [blink]
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mov r3, r0 ; don;t clobber ret val
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;;; if size <= 8
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cmp r2, 8
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bls.d @smallchunk
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mov.f lp_count, r2
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and.f r4, r0, 0x03
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rsub lp_count, r4, 4
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lpnz @aligndestination
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;; LOOP BEGIN
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ldb.ab r5, [r1,1]
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sub r2, r2, 1
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stb.ab r5, [r3,1]
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aligndestination:
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;;; Check the alignment of the source
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and.f r4, r1, 0x03
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bnz.d @sourceunaligned
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;;; CASE 0: Both source and destination are 32bit aligned
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;;; Convert len to Dwords, unfold x4
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lsr.f lp_count, r2, ZOLSHFT
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lpnz @copy32_64bytes
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;; LOOP START
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LOADX (r6, r1)
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PREFETCH_READ (r1)
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PREFETCH_WRITE (r3)
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LOADX (r8, r1)
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LOADX (r10, r1)
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LOADX (r4, r1)
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STOREX (r6, r3)
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STOREX (r8, r3)
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STOREX (r10, r3)
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STOREX (r4, r3)
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copy32_64bytes:
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and.f lp_count, r2, ZOLAND ;Last remaining 31 bytes
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smallchunk:
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lpnz @copyremainingbytes
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;; LOOP START
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ldb.ab r5, [r1,1]
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stb.ab r5, [r3,1]
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copyremainingbytes:
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j [blink]
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;;; END CASE 0
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sourceunaligned:
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cmp r4, 2
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beq.d @unalignedOffby2
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sub r2, r2, 1
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bhi.d @unalignedOffby3
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ldb.ab r5, [r1, 1]
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;;; CASE 1: The source is unaligned, off by 1
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;; Hence I need to read 1 byte for a 16bit alignment
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;; and 2bytes to reach 32bit alignment
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ldh.ab r6, [r1, 2]
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sub r2, r2, 2
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;; Convert to words, unfold x2
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lsr.f lp_count, r2, 3
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MERGE_1 (r6, r6, 8)
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MERGE_2 (r5, r5, 24)
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or r5, r5, r6
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;; Both src and dst are aligned
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lpnz @copy8bytes_1
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;; LOOP START
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ld.ab r6, [r1, 4]
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prefetch [r1, 28] ;Prefetch the next read location
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ld.ab r8, [r1,4]
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prefetchw [r3, 32] ;Prefetch the next write location
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SHIFT_1 (r7, r6, 24)
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or r7, r7, r5
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SHIFT_2 (r5, r6, 8)
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SHIFT_1 (r9, r8, 24)
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or r9, r9, r5
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SHIFT_2 (r5, r8, 8)
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st.ab r7, [r3, 4]
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st.ab r9, [r3, 4]
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copy8bytes_1:
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;; Write back the remaining 16bits
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EXTRACT_1 (r6, r5, 16)
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sth.ab r6, [r3, 2]
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;; Write back the remaining 8bits
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EXTRACT_2 (r5, r5, 16)
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stb.ab r5, [r3, 1]
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and.f lp_count, r2, 0x07 ;Last 8bytes
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lpnz @copybytewise_1
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;; LOOP START
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ldb.ab r6, [r1,1]
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stb.ab r6, [r3,1]
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copybytewise_1:
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j [blink]
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unalignedOffby2:
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;;; CASE 2: The source is unaligned, off by 2
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ldh.ab r5, [r1, 2]
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sub r2, r2, 1
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;; Both src and dst are aligned
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;; Convert to words, unfold x2
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lsr.f lp_count, r2, 3
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#ifdef __BIG_ENDIAN__
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asl.nz r5, r5, 16
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#endif
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lpnz @copy8bytes_2
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;; LOOP START
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ld.ab r6, [r1, 4]
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prefetch [r1, 28] ;Prefetch the next read location
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ld.ab r8, [r1,4]
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prefetchw [r3, 32] ;Prefetch the next write location
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SHIFT_1 (r7, r6, 16)
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or r7, r7, r5
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SHIFT_2 (r5, r6, 16)
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SHIFT_1 (r9, r8, 16)
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or r9, r9, r5
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SHIFT_2 (r5, r8, 16)
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st.ab r7, [r3, 4]
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st.ab r9, [r3, 4]
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copy8bytes_2:
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#ifdef __BIG_ENDIAN__
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lsr.nz r5, r5, 16
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#endif
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sth.ab r5, [r3, 2]
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and.f lp_count, r2, 0x07 ;Last 8bytes
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lpnz @copybytewise_2
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;; LOOP START
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ldb.ab r6, [r1,1]
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stb.ab r6, [r3,1]
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copybytewise_2:
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j [blink]
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unalignedOffby3:
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;;; CASE 3: The source is unaligned, off by 3
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;;; Hence, I need to read 1byte for achieve the 32bit alignment
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;; Both src and dst are aligned
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;; Convert to words, unfold x2
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lsr.f lp_count, r2, 3
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#ifdef __BIG_ENDIAN__
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asl.ne r5, r5, 24
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#endif
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lpnz @copy8bytes_3
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;; LOOP START
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ld.ab r6, [r1, 4]
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prefetch [r1, 28] ;Prefetch the next read location
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ld.ab r8, [r1,4]
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prefetch [r3, 32] ;Prefetch the next write location
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SHIFT_1 (r7, r6, 8)
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or r7, r7, r5
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SHIFT_2 (r5, r6, 24)
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SHIFT_1 (r9, r8, 8)
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or r9, r9, r5
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SHIFT_2 (r5, r8, 24)
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st.ab r7, [r3, 4]
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st.ab r9, [r3, 4]
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copy8bytes_3:
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#ifdef __BIG_ENDIAN__
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lsr.nz r5, r5, 24
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#endif
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stb.ab r5, [r3, 1]
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and.f lp_count, r2, 0x07 ;Last 8bytes
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lpnz @copybytewise_3
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;; LOOP START
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ldb.ab r6, [r1,1]
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stb.ab r6, [r3,1]
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copybytewise_3:
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j [blink]
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END(memcpy)
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