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|
TEXT memcmp(SB),$0
MOVQ n+16(FP), BX
CMPQ BX, $0
JEQ none
MOVQ RARG, DI
MOVQ p2+8(FP), SI
CLD
MOVQ DI, CX
ORQ SI, CX
ANDL $3, CX
JNE c3
/*
* first by longs
*/
MOVQ BX, CX
SHRQ $2, CX
REP; CMPSL
JNE found
/*
* then by bytes
*/
ANDL $3, BX
c3:
MOVQ BX, CX
REP; CMPSB
JNE found1
none:
MOVQ $0, AX
RET
/*
* if long found,
* back up and look by bytes
*/
found:
MOVL $4, CX
SUBQ CX, DI
SUBQ CX, SI
REP; CMPSB
found1:
JLS lt
MOVQ $-1, AX
RET
lt:
MOVQ $1, AX
RET
|
