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SnHnBn 2003-10-28
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楼主在倒分吗？
SnHnBn 2003-10-23
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to: predrose(predrose)
please explain that why the value of the ax is zero in your code ? if there is no loop, the inc ax instruction must be executed once. why ax is still zero?
if you can not understand, I can tell you the reason is the inc ax instruction being executed 0xFFFF+1 times, then ax is overflow to zero(please check the AC flag).
Here another simple code, please test it:
100 mov cx,0
103 loop 100
104 int 3
hmm, the two instructions will satirize you. So, do not designating the others are newbeis arbitrary before you considering.
please explain that why the value of the ax is zero in your code ? if there is no loop, the inc ax instruction must be executed once. why ax is still zero?
if you can not understand, I can tell you the reason is the inc ax instruction being executed 0xFFFF+1 times, then ax is overflow to zero(please check the AC flag).
Here another simple code, please test it:
100 mov cx,0
103 loop 100
104 int 3
hmm, the two instructions will satirize you. So, do not designating the others are newbeis arbitrary before you considering.
predrose 2003-10-22
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Please use debug to test belowing code:
100 mov ax,0
103 mov cx,0
106 inc ax
107 loop 106
109 int 3
g=100
She screen output: EAX=0 ECX=0
So we have consider for the question: NO loop, CX=0.
The newbies on the CSDN have more, too.
100 mov ax,0
103 mov cx,0
106 inc ax
107 loop 106
109 int 3
g=100
She screen output: EAX=0 ECX=0
So we have consider for the question: NO loop, CX=0.
The newbies on the CSDN have more, too.
junhli 2003-10-22
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0xffff
SnHnBn 2003-10-22
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0xFFFF
Lymtics 2003-10-22
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如下:
-a
13A7:0100 xor ax,ax
13A7:0102 xor cx,cx
13A7:0104 inc ax
13A7:0105 loop 0104
13A7:0107 int3
13A7:0108
-
-t
AX=0000 BX=0000 CX=0000 DX=0000 SP=FFEE BP=0000 SI=0000 DI=0000
DS=13A7 ES=13A7 SS=13A7 CS=13A7 IP=0102 NV UP EI PL ZR NA PE NC
13A7:0102 31C9 XOR CX,CX
-t
AX=0000 BX=0000 CX=0000 DX=0000 SP=FFEE BP=0000 SI=0000 DI=0000
DS=13A7 ES=13A7 SS=13A7 CS=13A7 IP=0104 NV UP EI PL ZR NA PE NC
13A7:0104 40 INC AX
-t
AX=0001 BX=0000 CX=0000 DX=0000 SP=FFEE BP=0000 SI=0000 DI=0000
DS=13A7 ES=13A7 SS=13A7 CS=13A7 IP=0105 NV UP EI PL NZ NA PO NC
13A7:0105 E2FD LOOP 0104
-t
AX=0001 BX=0000 CX=FFFF DX=0000 SP=FFEE BP=0000 SI=0000 DI=0000
DS=13A7 ES=13A7 SS=13A7 CS=13A7 IP=0104 NV UP EI PL NZ NA PO NC
13A7:0104 40 INC AX
-t
AX=0002 BX=0000 CX=FFFF DX=0000 SP=FFEE BP=0000 SI=0000 DI=0000
DS=13A7 ES=13A7 SS=13A7 CS=13A7 IP=0105 NV UP EI PL NZ NA PO NC
13A7:0105 E2FD LOOP 0104
to:predrose(predrose)
now explain it,please??!!
-a
13A7:0100 xor ax,ax
13A7:0102 xor cx,cx
13A7:0104 inc ax
13A7:0105 loop 0104
13A7:0107 int3
13A7:0108
-
-t
AX=0000 BX=0000 CX=0000 DX=0000 SP=FFEE BP=0000 SI=0000 DI=0000
DS=13A7 ES=13A7 SS=13A7 CS=13A7 IP=0102 NV UP EI PL ZR NA PE NC
13A7:0102 31C9 XOR CX,CX
-t
AX=0000 BX=0000 CX=0000 DX=0000 SP=FFEE BP=0000 SI=0000 DI=0000
DS=13A7 ES=13A7 SS=13A7 CS=13A7 IP=0104 NV UP EI PL ZR NA PE NC
13A7:0104 40 INC AX
-t
AX=0001 BX=0000 CX=0000 DX=0000 SP=FFEE BP=0000 SI=0000 DI=0000
DS=13A7 ES=13A7 SS=13A7 CS=13A7 IP=0105 NV UP EI PL NZ NA PO NC
13A7:0105 E2FD LOOP 0104
-t
AX=0001 BX=0000 CX=FFFF DX=0000 SP=FFEE BP=0000 SI=0000 DI=0000
DS=13A7 ES=13A7 SS=13A7 CS=13A7 IP=0104 NV UP EI PL NZ NA PO NC
13A7:0104 40 INC AX
-t
AX=0002 BX=0000 CX=FFFF DX=0000 SP=FFEE BP=0000 SI=0000 DI=0000
DS=13A7 ES=13A7 SS=13A7 CS=13A7 IP=0105 NV UP EI PL NZ NA PO NC
13A7:0105 E2FD LOOP 0104
to:predrose(predrose)
now explain it,please??!!
Lymtics 2003-10-22
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loop 65535 .................
predrose 2003-10-22
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Dear all of Newbies:
See my first code and then execting it.
If you doesn't explict for the question, please see the instruction set reference (Intel Developer manual 2)(3-393 Pages)
See my first code and then execting it.
If you doesn't explict for the question, please see the instruction set reference (Intel Developer manual 2)(3-393 Pages)
hswxf 2003-10-22
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MOV CX，之后的LOOP才决定CX-1值，应该是FFFFH（=-1）
所以你的LOOP要过%￥……%￥……%—……
所以你的LOOP要过%￥……%￥……%—……
SnHnBn 2003-10-22
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The newbie is ONLY YOU！now.:) 铛铛铛铛……
SnHnBn 2003-10-22
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楼上，如果没有循环，ax的值是1才对。动动脑袋为什么ax=0, cx=0吧。
caonimabi 2003-10-21
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65535
ahjoe 2003-10-21
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65536
hcj2002 2003-10-21
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没有循环
zuolihua 2003-10-21
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65535,0没有循环
csdsjkk 2003-10-20
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65536
