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TEXT strchr(SB), $0
MOVW R7, 0(FP)
MOVB c+7(FP), R10
MOVW s+0(FP), R9
SUBCC R0,R10, R0
BE l2
/*
* char is not null
*/
l1:
MOVB (R9), R7
ADD $1, R9
SUBCC R0,R7, R0
BE ret
SUBCC R7,R10, R0
BNE l1
JMP rm1
/*
* char is null
* align to word
*/
l2:
ANDCC $3,R9, R0
BE l3
MOVB (R9), R7
ADD $1, R9
SUBCC R0,R7, R0
BNE l2
JMP rm1
/*
* develop byte masks
*/
l3:
MOVW $0xff, R17
SLL $8,R17, R16
SLL $16,R17, R13
SLL $24,R17, R12
l4:
MOVW (R9), R11
ADD $4, R9
ANDCC R12,R11, R0
BE b0
ANDCC R13,R11, R0
BE b1
ANDCC R16,R11, R0
BE b2
ANDCC R17,R11, R0
BNE l4
rm1:
SUB $1,R9, R7
JMP ret
b2:
SUB $2,R9, R7
JMP ret
b1:
SUB $3,R9, R7
JMP ret
b0:
SUB $4,R9, R7
JMP ret
ret:
RETURN
|
