ref: c8a7747659c6b8aa4989cfcccf518cbe18d9182d
dir: /sys/src/libc/sparc/strchr.s/
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