1 TEXT strchr(SB), $0 2 3 MOVQ RARG, DI 4 MOVB c+8(FP), AX 5 CMPB AX, $0 6 JEQ l2 /**/ 7 8/* 9 * char is not null 10 */ 11l1: 12 MOVB (DI), BX 13 CMPB BX, $0 14 JEQ ret0 15 ADDQ $1, DI 16 CMPB AX, BX 17 JNE l1 18 19 MOVQ DI, AX 20 SUBQ $1, AX 21 RET 22 23/* 24 * char is null 25 */ 26l2: 27 MOVQ $-1, CX 28 CLD 29 30 REPN; SCASB 31 32 MOVQ DI, AX 33 SUBQ $1, AX 34 RET 35 36ret0: 37 MOVQ $0, AX 38 RET 39