advanced-go-programming-book/errata/a_amd64.s at master · chai2010/advanced-go-programming-book

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#include "textflag.h"

// func LoopAdd(cnt, v0, step int) int

TEXT ·LoopAdd(SB), NOSPLIT, $0-32

MOVQ $0, BX // result

MOVQ cnt+0(FP), AX // cnt

MOVQ v0+8(FP), DI // vi = v0

MOVQ step+16(FP), CX // step

LOOP_BEGIN:

MOVQ $0, 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 DI, BX // result += vi

ADDQ CX, DI // vi += step

ADDQ $1, DX // i++

JMP LOOP_IF

LOOP_END:

MOVQ BX, ret+24(FP) // return result

RET

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