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! 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__ */
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