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! Entry: arg0: destination

!        arg1: source

! Exit:  result: destination

!

! SH5 code Copyright 2002 SuperH Ltd.

#include "asm.h"

ENTRY(strcpy)

#if __SHMEDIA__

        pta/l shortstring,tr1

        ldlo.q r3,0,r4

        ptabs r18,tr4

        shlli r3,3,r7

        addi r2, 8, r0

        mcmpeq.b r4,r63,r6

        SHHI r6,r7,r6

        bnei/u r6,0,tr1 // shortstring

        pta/l no_lddst, tr2

        ori r3,-8,r23

        sub r2, r23, r0

        sub r3, r2, r21

        addi r21, 8, r20

        ldx.q r0, r21, r5

        pta/l loop, tr0

        ori r2,-8,r22

        mcmpeq.b r5, r63, r6

        bgt/u r22, r23, tr2 // no_lddst

        // r22 < r23 :  Need to do a load from the destination.

        // r22 == r23 : Doesn't actually need to load from destination,

        //              but still can be handled here.

        ldlo.q r2, 0, r9

        movi -1, r8

        SHLO r8, r7, r8

        mcmv r4, r8, r9

        stlo.q r2, 0, r9

        beqi/l r6, 0, tr0 // loop

        add r5, r63, r4

        addi r0, 8, r0

        blink tr1, r63 // shortstring

no_lddst:

        // r22 > r23: note that for r22 == r23 the sthi.q would clobber

        //            bytes before the destination region.

        stlo.q r2, 0, r4

        SHHI r4, r7, r4

        sthi.q r0, -1, r4

        beqi/l r6, 0, tr0 // loop

        add r5, r63, r4

        addi r0, 8, r0

shortstring:

#ifndef __LITTLE_ENDIAN__

        pta/l shortstring2,tr1

        byterev r4,r4

#endif

shortstring2:

        st.b r0,-8,r4

        andi r4,0xff,r5

        shlri r4,8,r4

        addi r0,1,r0

        bnei/l r5,0,tr1

        blink tr4,r63 // return

        .balign 8

loop:

        stlo.q r0, 0, r5

        ldx.q r0, r20, r4

        addi r0, 16, r0

        sthi.q r0, -9, r5

        mcmpeq.b r4, r63, r6

        bnei/u r6, 0, tr1 // shortstring

        ldx.q r0, r21, r5

        stlo.q r0, -8, r4

        sthi.q r0, -1, r4

        mcmpeq.b r5, r63, r6

        beqi/l r6, 0, tr0 // loop

        add r5, r63, r4

        addi r0, 8, r0

        blink tr1, r63 // shortstring

#else /* ! __SHMEDIA__, i.e. SH 1..4 / SHcompact */

#ifdef __SH5__

#define DST r2

#define SRC r3

#define TMP r4

#define RESULT R2

!        r0,r1,r3,r4: clobbered

#else

#define DST r4

#define SRC r5

#define TMP r2

#define RESULT r0

!        r1-r2,r5: clobbered

#endif

        mov     DST,r0

        or      SRC,r0

        tst     #3,r0

        SL(bf, L_setup_char_loop, mov DST,r0)

        mov.l   @SRC+,r1

        mov     #0,TMP

        cmp/str TMP,r1

        SL(bt, Longword_loop_end, sub SRC,r0)

        .align  2

Longword_loop:

        mov.l   r1,@(r0,SRC)

        mov.l   @SRC+,r1

        cmp/str TMP,r1

        bt      Longword_loop_end

        mov.l   r1,@(r0,SRC)

        mov.l   @SRC+,r1

        cmp/str TMP,r1

        bf      Longword_loop

Longword_loop_end:

        add     #-4,SRC

        add     #3,r0

        .align  2

L_char_loop:

        mov.b   @SRC+,r1

L_char_loop_start:

        tst     r1,r1

        SL(bf, L_char_loop, mov.b r1,@(r0,SRC))

        rts

        mov DST,RESULT

L_setup_char_loop:

        mov.b   @SRC+,r1

        bra L_char_loop_start

        sub SRC,r0

#endif /* ! __SHMEDIA__ */