ref: 82c7251dc3ff57ae97c0ce24b72e2e2ae5f6945b
dir: /sys/src/libc/amd64/strchr.s/
TEXT strchr(SB), $0 MOVQ RARG, DI MOVB c+8(FP), AX CMPB AX, $0 JEQ l2 /**/ /* * char is not null */ l1: MOVB (DI), BX CMPB BX, $0 JEQ ret0 ADDQ $1, DI CMPB AX, BX JNE l1 MOVQ DI, AX SUBQ $1, AX RET /* * char is null */ l2: MOVQ $-1, CX CLD REPN; SCASB MOVQ DI, AX SUBQ $1, AX RET ret0: MOVQ $0, AX RET