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- TEXT strchr(SB), $0
- MOVBU c+4(FP), R1
- CMP $0, R1
- BEQ _null
- _strchr: /* not looking for a null, byte at a time */
- MOVBU.P 1(R0), R2
- CMP R1, R2
- BEQ _sub1
- CMP $0, R2
- BNE _strchr
- _return0: /* character not found in string, return 0 */
- MOVW $0, R0
- RET
- _null: /* looking for null, align */
- AND.S $3, R0, R2
- BEQ _aligned
- MOVBU.P 1(R0), R4
- CMP $0, R4
- BEQ _sub1
- B _null
- _aligned:
- MOVW $0xFF, R3 /* mask */
- _loop:
- MOVW.P 4(R0), R4 /* 4 at a time */
- TST R4, R3 /* AND.S R2, R3, Rx */
- TST.NE R4>>8, R3
- TST.NE R4>>16, R3
- TST.NE R4>>24, R3
- BNE _loop
- TST R4, R3 /* its somewhere, find it and correct */
- BEQ _sub4
- TST R4>>8, R3
- BEQ _sub3
- TST R4>>16, R3
- BEQ _sub2
- _sub1: /* compensate for pointer increment */
- SUB $1, R0
- RET
- _sub2:
- SUB $2, R0
- RET
- _sub3:
- SUB $3, R0
- RET
- _sub4:
- SUB $4, R0
- RET
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