ref: dc593372bfc4224c6cf91d2031d0ad0aeadaddfe
dir: /sys/src/libc/spim/memchr.s/
TEXT memchr(SB), $0 MOVW R1, 0(FP) MOVW n+8(FP), R1 MOVW s1+0(FP), R2 MOVBU c+4(FP), R3 ADDU R1, R2, R6 AND $(~1), R1, R5 ADDU R2, R5 BEQ R2, R5, lt2 l1: MOVBU 0(R2), R4 MOVBU 1(R2), R7 BEQ R3, R4, eq0 ADDU $2, R2 BEQ R3, R7, eq BNE R2, R5, l1 lt2: BEQ R2, R6, zret l2: MOVBU (R2), R4 ADDU $1, R2 BEQ R3, R4, eq BNE R2, R6, l2 zret: MOVW R0, R1 RET eq0: MOVW R2, R1 RET eq: SUBU $1,R2, R1 RET