#include "../../cmd/ld/textflag.h"
TEXT runtime·memmove(SB), NOSPLIT, $0-24
MOVQ to+0(FP), DI
MOVQ fr+8(FP), SI
MOVQ n+16(FP), BX
tail:
TESTQ BX, BX
JEQ move_0
CMPQ BX, $2
JBE move_1or2
CMPQ BX, $4
JBE move_3or4
CMPQ BX, $8
JBE move_5through8
CMPQ BX, $16
JBE move_9through16
CMPQ BX, $32
JBE move_17through32
CMPQ BX, $64
JBE move_33through64
CMPQ BX, $128
JBE move_65through128
CMPQ BX, $256
JBE move_129through256
CMPQ SI, DI
JLS back
forward:
MOVQ BX, CX
SHRQ $3, CX
ANDQ $7, BX
REP; MOVSQ
JMP tail
back:
MOVQ SI, CX
ADDQ BX, CX
CMPQ CX, DI
JLS forward
ADDQ BX, DI
ADDQ BX, SI
STD
MOVQ BX, CX
SHRQ $3, CX
ANDQ $7, BX
SUBQ $8, DI
SUBQ $8, SI
REP; MOVSQ
CLD
ADDQ $8, DI
ADDQ $8, SI
SUBQ BX, DI
SUBQ BX, SI
JMP tail
move_1or2:
MOVB (SI), AX
MOVB -1(SI)(BX*1), CX
MOVB AX, (DI)
MOVB CX, -1(DI)(BX*1)
move_0:
RET
move_3or4:
MOVW (SI), AX
MOVW -2(SI)(BX*1), CX
MOVW AX, (DI)
MOVW CX, -2(DI)(BX*1)
RET
move_5through8:
MOVL (SI), AX
MOVL -4(SI)(BX*1), CX
MOVL AX, (DI)
MOVL CX, -4(DI)(BX*1)
RET
move_9through16:
MOVQ (SI), AX
MOVQ -8(SI)(BX*1), CX
MOVQ AX, (DI)
MOVQ CX, -8(DI)(BX*1)
RET
move_17through32:
MOVOU (SI), X0
MOVOU -16(SI)(BX*1), X1
MOVOU X0, (DI)
MOVOU X1, -16(DI)(BX*1)
RET
move_33through64:
MOVOU (SI), X0
MOVOU 16(SI), X1
MOVOU -32(SI)(BX*1), X2
MOVOU -16(SI)(BX*1), X3
MOVOU X0, (DI)
MOVOU X1, 16(DI)
MOVOU X2, -32(DI)(BX*1)
MOVOU X3, -16(DI)(BX*1)
RET
move_65through128:
MOVOU (SI), X0
MOVOU 16(SI), X1
MOVOU 32(SI), X2
MOVOU 48(SI), X3
MOVOU -64(SI)(BX*1), X4
MOVOU -48(SI)(BX*1), X5
MOVOU -32(SI)(BX*1), X6
MOVOU -16(SI)(BX*1), X7
MOVOU X0, (DI)
MOVOU X1, 16(DI)
MOVOU X2, 32(DI)
MOVOU X3, 48(DI)
MOVOU X4, -64(DI)(BX*1)
MOVOU X5, -48(DI)(BX*1)
MOVOU X6, -32(DI)(BX*1)
MOVOU X7, -16(DI)(BX*1)
RET
move_129through256:
MOVOU (SI), X0
MOVOU 16(SI), X1
MOVOU 32(SI), X2
MOVOU 48(SI), X3
MOVOU 64(SI), X4
MOVOU 80(SI), X5
MOVOU 96(SI), X6
MOVOU 112(SI), X7
MOVOU -128(SI)(BX*1), X8
MOVOU -112(SI)(BX*1), X9
MOVOU -96(SI)(BX*1), X10
MOVOU -80(SI)(BX*1), X11
MOVOU -64(SI)(BX*1), X12
MOVOU -48(SI)(BX*1), X13
MOVOU -32(SI)(BX*1), X14
MOVOU -16(SI)(BX*1), X15
MOVOU X0, (DI)
MOVOU X1, 16(DI)
MOVOU X2, 32(DI)
MOVOU X3, 48(DI)
MOVOU X4, 64(DI)
MOVOU X5, 80(DI)
MOVOU X6, 96(DI)
MOVOU X7, 112(DI)
MOVOU X8, -128(DI)(BX*1)
MOVOU X9, -112(DI)(BX*1)
MOVOU X10, -96(DI)(BX*1)
MOVOU X11, -80(DI)(BX*1)
MOVOU X12, -64(DI)(BX*1)
MOVOU X13, -48(DI)(BX*1)
MOVOU X14, -32(DI)(BX*1)
MOVOU X15, -16(DI)(BX*1)
RET