1 TEXT strchr(SB), $0 2 3 MOVL s+0(FP), DI 4 MOVB c+4(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 ADDL $1, DI 16 CMPB AX, BX 17 JNE l1 18 19 MOVL DI, AX 20 SUBL $1, AX 21 RET 22 23/* 24 * char is null 25 */ 26l2: 27 MOVL $-1, CX 28 CLD 29 30 REPN; SCASB 31 32 MOVL DI, AX 33 SUBL $1, AX 34 RET 35 36ret0: 37 MOVL $0, AX 38 RET 39