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feiquan123 avatar feiquan123 commented on May 18, 2024

修改后:

func LoopAdd(cnt, v0, step int) int {
	result := v0
	next := v0
	for i := 1; i < cnt; i++ {
		next += step
		result += next
	}
	return result
}

汇编:

TEXT ·LoopAdd(SB),$0-32
	MOVQ cnt+8*0(FP), AX // cnt
	MOVQ v0+8*1(FP), BX // v0 /result
	MOVQ step+8*2(FP), CX // step

	MOVQ BX, R8 // next
	MOVQ $1, DX // i

LOOP_IF:
	CMPQ DX, AX // compare i, cnt
	JL LOOP_BODY // if i < cnt; goto LOOP_BODY
	JMP LOOP_END

LOOP_BODY:
	ADDQ CX, R8 // next += step
	ADDQ R8, BX // result += next
	ADDQ $1, DX // i++
	JMP LOOP_IF

LOOP_END:
	MOVQ BX, ret+8*3(FP) // return result
	RET

from advanced-go-programming-book.

chai2010 avatar chai2010 commented on May 18, 2024

发现 BUG 直接上 PR

from advanced-go-programming-book.

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