Subversion Repositories openrisc_2011-10-31

! Entry: arg0: string start address

! Exit:  result: length

!

! Copyright 2002 SuperH Ltd.

#include "asm.h"

ENTRY(strlen)

#if __SHMEDIA__

        ldlo.q r2,0,r3

        ptabs/l r18,tr0

        pta/l loop,tr1

        andi r2,-8,r0

        shlli r2,3,r1

        mcmpeq.b r3,r63,r3

        SHHI r3,r1,r4

        beqi/u r4,0,tr1 // loop

#ifdef __LITTLE_ENDIAN__

        movi -1,r2

        addi r3,-1,r4

        msad.ubq r3,r4,r2

#else

        shlri r3,1,r3

        nsb r3,r3

        shlri r3,3,r2

#endif

        blink tr0,r63

loop:

        ldlo.q r0,8,r3

        addi r0,8,r0

        ldlo.q r0,8,r63

        mcmpeq.b r3,r63,r3

        beqi/l r3,0,tr1 // loop

        sub r0,r2,r2

#ifdef __LITTLE_ENDIAN__

        addi r3,-1,r4

        addi r2,-1,r2

        msad.ubq r3,r4,r2

#else

        shlri r3,1,r3

        nsb r3,r3

        shlri r3,3,r3

        add r2,r3,r2

#endif

        blink tr0,r63

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

#ifdef __SH5__

#define STR_INIT r2

#define STR_ORIG r0

#define STR_COPY STR_ORIG

#define MASK r1

#define TMP r3

#define RESULT r2

!        r0,r1,r3: clobbered

#else

#define STR_INIT r4

#define STR_ORIG STR_INIT

#define STR_COPY STR

#define MASK r1

#define TMP r3

#define RESULT r0

!        r1,r3: clobbered

#endif

#define STR RESULT

        mov #3,MASK

        and STR_INIT,MASK

        tst MASK,MASK

        SL(bf, L_char_loop, mov STR_INIT, STR_COPY)

L_word_loop:

        mov.l @STR+,TMP

        cmp/str MASK,TMP

        bf L_word_loop

        add #-4,STR

L_char_loop:

        mov.b @STR+,TMP

        tst TMP,TMP

        bf L_char_loop

        add #-1,STR

        rts

        sub STR_ORIG,STR

#endif /* ! __SHMEDIA__ */