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Merge pull request #420 from whtiehack/patch-4

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Update ch3-05-control-flow.md
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ch3-asm/ch3-05-control-flow.md
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@ -213,6 +213,8 @@ LOOP_END:
下面用汇编语言重新实现LoopAdd函数 下面用汇编语言重新实现LoopAdd函数
``` ```
#include "textflag.h"
// func LoopAdd(cnt, v0, step int) int // func LoopAdd(cnt, v0, step int) int
TEXT ·LoopAdd(SB), NOSPLIT, $0-32 TEXT ·LoopAdd(SB), NOSPLIT, $0-32
MOVQ cnt+0(FP), AX // cnt MOVQ cnt+0(FP), AX // cnt
@ -225,12 +227,12 @@ LOOP_BEGIN:
LOOP_IF: LOOP_IF:
CMPQ DX, AX // compare i, cnt CMPQ DX, AX // compare i, cnt
JL LOOP_BODY // if i < cnt: goto LOOP_BODY JL LOOP_BODY // if i < cnt: goto LOOP_BODY
goto LOOP_END JMP LOOP_END
LOOP_BODY: LOOP_BODY:
ADDQ $1, DX // i++ ADDQ $1, DX // i++
ADDQ CX, BX // result += step ADDQ CX, BX // result += step
goto LOOP_IF JMP LOOP_IF
LOOP_END: LOOP_END: