Chapter 3 - Part II.ppt

8/10/2019 Chapter 3 - Part II.ppt

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The x86 Microprocessor - Lyla B Das 1

CHAPTER 3


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ARITHMETIC

I!TR"CTI#!


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Table 3.4 $ %&ll !e' o( Ari'h)e'ic

I*s'r&c'io*s


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The x86 Microprocessor - Lyla B Das +

Table 3.4 $ %&ll !e' o( Ari'h)e'ic

I*s'r&c'io*s , Co*'.


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The x86 Microprocessor - Lyla B Das /

Carry Flag Control Instructionsi0 CLC , Clear carry.

ii0 !TC , !e' carry.

iii0 CMC , Co)ple)e*' carry


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Exa)ple 3.11


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The x86 Microprocessor - Lyla B Das

Exa)ple 3.12As 1 y'es s'ore i* )e)ory. The s&) o(

'hese 'e* y'es 4ill *o' 5' i*'o a y'e loca'io*.!o a 4or loca'io* is 'o e alloca'e (or 'hes&).


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Exa)ple 3.12 Co*'.


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The x86 Microprocessor - Lyla B Das

Exa)ple 3.1%i* 'he i77es' o( 1 y'es s'ore i* )e)ory.


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Exa)ple 3.1 , !ol&'io*


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Exa)ple 3.1T4o y'es s'ore i* 'he a'a se7)e*' are

)&l'iplie. The res&l' o( )&l'iplica'io* isaailale i* A9: 4hich is 'he* )oe 'o 'heloca'io* PR#D: a 4or loca'io*. ;ri'e apro7ra) (or 'his.


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Table 3.7: LOGICAL INSTRCTIONS$ Lis' o(Lo7ical I*s'r&c'io*s a* %&*c'io*s Per(or)ey 'he)


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The x86 Microprocessor - Lyla B Das 1+

Exa)ple 3.23%i* 'he res&l' a* 'he s'a'e o( 'he ie* A9 ? 8CH: B9 ? 3+/EH: C9 ? 6EBHi0 AD BL: CL

ii0 #R AH: BH

iii0 9#R AL: CH

i0 TE!T AH: BL


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The x86 Microprocessor - Lyla B Das 1/

Ty!ical A!!lications o" Logical

Instructions


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"se o( 'he TE!T i*s'r&c'io*


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S#i"t an$ Rotate Instructions

Table 3.% $ Lis' o( 'he !hi(' a* Ro'a'e I*s'r&c'io*s


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%ea'&res o( 'he shi(' i*s'r&c'io*@ !hi(' i*s'r&c'io*s o ari'h)e'ic or lo7ical shi('i*7.

@ They also shi(' ri7h' or le('.

@ Ari'h)e'ic shi(' is &se (or si7*e *&)er opera'io*s: 4hilelo7ical shi(' ca'ers 'o &*si7*e *&)ers.

@ !hi('i*7 ri7h' ca&ses a iie y 2: (or each i' posi'io* shi('e:4hile shi('i*7 le(' correspo*s 'o a )&l'iplica'io* y 2.

@ The co&*' )ea*s 'he *&)er o( i' posi'io*s: y 4hich shi('i*7is 'o e o*e.

@ I( 'he co&*' 1: loa i' i* CL: o'her4ise &se 1 i* 'hei))eia'e )oe.


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!HI%T LE%T!AL!HL , !hi(' Le('

Ari'h)e'ic!hi(' Le('Lo7ical.

"sa7e SAL&S'L $est(count.


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!HI%T LE%TExa)ples

!HL B9: 1

!AL AL: CL!HL DATA2: CL

!HL BFTE PTR GB9GDI: 1

!AL ;#RD PTR GDI: CL


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Exa)ple 3.2+%i* 'he 4ei7h' o( )o&lo s&) o( '4o

*&)ers


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Exa)ple 3.2+ , !ol&'io*


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!HI%T RI>HT!HR , !hi(' Ri7h' Lo7ical.

sage: S'R $est(count


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!HI%T RI>HTExa)ples

@ !HR D9: 1

@ !HR ;#RD PTR G!I THERE: CL@ !HR CH: CL

@ !HR BFTE PTR GBPG!I: 1


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The x86 Microprocessor - Lyla B Das 2/

Exa)ple 3.2/Co*er' a pace BCD y'e 'o '4o &*pace

y'es


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Exa)ple 3.2/ , !ol&'io*


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Ro'a'e I*s'r&c'io*sR#L , Ro'a'e Le('

sage: ROL $est(count

Moi5es %la7s C% #%


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Ro'a'e Le('Exa)ples

R#L !I: CL

R#L BFTE PTR GDIGB9: 1


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ROR ) Rotate Rig#t"sa7e R#R es': co&*'

Moi5es %la7s C% #%


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Ro'a'e 'hro&7h carryRCL , Ro'a'e Thro&7h Carry

Le('.

"sa7e RCL es': co&*'.

Moi5es %la7s C% #%


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Ro'a'e le(' 'hro&7h carryExa)ples

RCL BL: CL

RCL C9: 1


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Ro'a'e ri7h' 'hro&7h carryRCR , Ro'a'e Thro&7h Carry Ri7h'.

"sa7e RCR es': co&*'

Moi5es %la7s C% #%


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Ro'a'e ri7h' 'hro&7h carry , Co*'.*+a,!les

RCR BFTE PTR G!I: 1

RCR ;#RD PTR GDIGB9: CL


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Exa)ple 3.2%i* 'he al&es i* 'he

es'i*a'io* (or each li*eo( 'his pro7ra) se7)e*'


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Th 86 Mi L l B D


Documents

Chapter 3 - Part II.ppt