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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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@ -213,8 +213,10 @@ LOOP_END:
下面用汇编语言重新实现LoopAdd函数
```
#include "textflag.h"
// 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 v0+8(FP), BX // v0/result
MOVQ step+16(FP), CX // step
@ -225,12 +227,12 @@ LOOP_BEGIN:
LOOP_IF:
CMPQ DX, AX // compare i, cnt
JL LOOP_BODY // if i < cnt: goto LOOP_BODY
goto LOOP_END
JMP LOOP_END
LOOP_BODY:
ADDQ $1, DX // i++
ADDQ CX, BX // result += step
goto LOOP_IF
JMP LOOP_IF
LOOP_END: