mirror of
https://github.com/autc04/Retro68.git
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88 lines
1.3 KiB
ArmAsm
88 lines
1.3 KiB
ArmAsm
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! Entry: arg0: string start address
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! Exit: result: length
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!
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! Copyright 2002 SuperH Ltd.
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#include "asm.h"
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ENTRY(strlen)
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#if __SHMEDIA__
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ldlo.q r2,0,r3
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ptabs/l r18,tr0
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pta/l loop,tr1
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andi r2,-8,r0
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shlli r2,3,r1
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mcmpeq.b r3,r63,r3
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SHHI r3,r1,r4
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beqi/u r4,0,tr1 // loop
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#ifdef __LITTLE_ENDIAN__
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movi -1,r2
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addi r3,-1,r4
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msad.ubq r3,r4,r2
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#else
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shlri r3,1,r3
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nsb r3,r3
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shlri r3,3,r2
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#endif
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blink tr0,r63
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loop:
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ldlo.q r0,8,r3
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addi r0,8,r0
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ldlo.q r0,8,r63
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mcmpeq.b r3,r63,r3
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beqi/l r3,0,tr1 // loop
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sub r0,r2,r2
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#ifdef __LITTLE_ENDIAN__
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addi r3,-1,r4
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addi r2,-1,r2
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msad.ubq r3,r4,r2
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#else
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shlri r3,1,r3
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nsb r3,r3
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shlri r3,3,r3
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add r2,r3,r2
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#endif
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blink tr0,r63
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#else /* ! __SHMEDIA__, i.e. SH 1..4 / SHcompact */
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#ifdef __SH5__
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#define STR_INIT r2
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#define STR_ORIG r0
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#define STR_COPY STR_ORIG
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#define MASK r1
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#define TMP r3
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#define RESULT r2
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! r0,r1,r3: clobbered
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#else
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#define STR_INIT r4
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#define STR_ORIG STR_INIT
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#define STR_COPY STR
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#define MASK r1
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#define TMP r3
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#define RESULT r0
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! r1,r3: clobbered
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#endif
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#define STR RESULT
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mov #3,MASK
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and STR_INIT,MASK
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tst MASK,MASK
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SL(bf, L_char_loop, mov STR_INIT, STR_COPY)
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L_word_loop:
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mov.l @STR+,TMP
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cmp/str MASK,TMP
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bf L_word_loop
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add #-4,STR
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L_char_loop:
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mov.b @STR+,TMP
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tst TMP,TMP
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bf L_char_loop
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add #-1,STR
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rts
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sub STR_ORIG,STR
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#endif /* ! __SHMEDIA__ */
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