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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [arch/] [ppc64/] [lib/] [memcpy.S] - Blame information for rev 1765

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1 1275 phoenix 
/*
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 * arch/ppc64/lib/memcpy.S
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 *
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 * Copyright (C) 2002 Paul Mackerras, IBM Corp.
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 *
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 * This program is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version
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 * 2 of the License, or (at your option) any later version.
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 */
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#include
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#include
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        .align  7
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_GLOBAL(memcpy)
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        mtcrf   0x01,r5
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        cmpldi  cr1,r5,16
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        neg     r6,r3           # LS 3 bits = # bytes to 8-byte dest bdry
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        andi.   r6,r6,7
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        dcbt    0,r4
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        blt     cr1,.Lshort_copy
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        bne     .Ldst_unaligned
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.Ldst_aligned:
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        andi.   r0,r4,7
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        addi    r3,r3,-16
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        bne     .Lsrc_unaligned
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        srdi    r7,r5,4
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        ld      r9,0(r4)
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        addi    r4,r4,-8
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        mtctr   r7
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        andi.   r5,r5,7
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        bf      cr7*4+0,2f
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        addi    r3,r3,8
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        addi    r4,r4,8
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        mr      r8,r9
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        blt     cr1,3f
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1:      ld      r9,8(r4)
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        std     r8,8(r3)
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2:      ldu     r8,16(r4)
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        stdu    r9,16(r3)
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        bdnz    1b
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3:      std     r8,8(r3)
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        beqlr
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        addi    r3,r3,16
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        ld      r9,8(r4)
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.Ldo_tail:
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        bf      cr7*4+1,1f
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        rotldi  r9,r9,32
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        stw     r9,0(r3)
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        addi    r3,r3,4
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1:      bf      cr7*4+2,2f
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        rotldi  r9,r9,16
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        sth     r9,0(r3)
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        addi    r3,r3,2
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2:      bf      cr7*4+3,3f
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        rotldi  r9,r9,8
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        stb     r9,0(r3)
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3:      blr
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.Lsrc_unaligned:
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        srdi    r6,r5,3
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        addi    r5,r5,-16
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        subf    r4,r0,r4
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        srdi    r7,r5,4
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        sldi    r10,r0,3
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        cmpdi   cr6,r6,3
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        andi.   r5,r5,7
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        mtctr   r7
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        subfic  r11,r10,64
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        add     r5,r5,r0
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        bt      cr7*4+0,0f
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        ld      r9,0(r4)        # 3+2n loads, 2+2n stores
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        ld      r0,8(r4)
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        sld     r6,r9,r10
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        ldu     r9,16(r4)
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        srd     r7,r0,r11
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        sld     r8,r0,r10
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        or      r7,r7,r6
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        blt     cr6,4f
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        ld      r0,8(r4)
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        # s1<< in r8, d0=(s0<<|s1>>) in r7, s3 in r0, s2 in r9, nix in r6 & r12
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        b       2f
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0:      ld      r0,0(r4)        # 4+2n loads, 3+2n stores
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        ldu     r9,8(r4)
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        sld     r8,r0,r10
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        addi    r3,r3,-8
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        blt     cr6,5f
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        ld      r0,8(r4)
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        srd     r12,r9,r11
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        sld     r6,r9,r10
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        ldu     r9,16(r4)
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        or      r12,r8,r12
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        srd     r7,r0,r11
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        sld     r8,r0,r10
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        addi    r3,r3,16
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        beq     cr6,3f
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        # d0=(s0<<|s1>>) in r12, s1<< in r6, s2>> in r7, s2<< in r8, s3 in r9
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1:      or      r7,r7,r6
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        ld      r0,8(r4)
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        std     r12,8(r3)
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2:      srd     r12,r9,r11
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        sld     r6,r9,r10
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        ldu     r9,16(r4)
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        or      r12,r8,r12
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        stdu    r7,16(r3)
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        srd     r7,r0,r11
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        sld     r8,r0,r10
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        bdnz    1b
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3:      std     r12,8(r3)
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        or      r7,r7,r6
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4:      std     r7,16(r3)
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5:      srd     r12,r9,r11
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        or      r12,r8,r12
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        std     r12,24(r3)
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        beqlr
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        cmpwi   cr1,r5,8
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        addi    r3,r3,32
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        sld     r9,r9,r10
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        ble     cr1,.Ldo_tail
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        ld      r0,8(r4)
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        srd     r7,r0,r11
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        or      r9,r7,r9
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        b       .Ldo_tail
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.Ldst_unaligned:
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        mtcrf   0x01,r6         # put #bytes to 8B bdry into cr7
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        subf    r5,r6,r5
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        li      r7,0
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        cmpldi  r1,r5,16
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        bf      cr7*4+3,1f
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        lbz     r0,0(r4)
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        stb     r0,0(r3)
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        addi    r7,r7,1
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1:      bf      cr7*4+2,2f
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        lhzx    r0,r7,r4
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        sthx    r0,r7,r3
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        addi    r7,r7,2
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2:      bf      cr7*4+1,3f
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        lwzx    r0,r7,r4
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        stwx    r0,r7,r3
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3:      mtcrf   0x01,r5
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        add     r4,r6,r4
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        add     r3,r6,r3
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        b       .Ldst_aligned
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.Lshort_copy:
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        bf      cr7*4+0,1f
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        lwz     r0,0(r4)
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        lwz     r9,4(r4)
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        addi    r4,r4,8
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        stw     r0,0(r3)
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        stw     r9,4(r3)
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        addi    r3,r3,8
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1:      bf      cr7*4+1,2f
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        lwz     r0,0(r4)
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        addi    r4,r4,4
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        stw     r0,0(r3)
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        addi    r3,r3,4
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2:      bf      cr7*4+2,3f
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        lhz     r0,0(r4)
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        addi    r4,r4,2
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        sth     r0,0(r3)
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        addi    r3,r3,2
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3:      bf      cr7*4+3,4f
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        lbz     r0,0(r4)
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        stb     r0,0(r3)
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4:      blr

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