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XADD in Assembler

XADD - Exchange and addition


CPU: i486+

Type of Instruction: User

Instruction: XADD dest,sorc


Description:

Temporary <- dest;
dest <- dest + sorc;
sorc <- Temporary;


Flags Affected: ZF,OF,SF,AF,PF,CF ( like ADD instruction ) ( see description)

CPU mode: RM,PM,VM,SMM

+++++++++++++++++++++++
Physical Form: XADD r/m8,r8
COP (Code of Operation) : 0FH C0H Postbyte

Clocks:
Intel i486 : 3/4
Cyrix Cx486SLC : 3/6
Pentium (tm) : 3/4

Penalty if cache miss :
Intel i486 : 6/2 ; Unlocked/Locked
Cyrix Cx486SLC : 0 ; N/A
+++++++++++++++++++++
Physical Form: XADD r/m16,r16
XADD r/m32,r32
COP (Code of Operation) : 0FH C1H Postbyte

Clocks:
Intel i486 : 3/4
Cyrix Cx486SLC : 3/6
Pentium (tm) : 3/4

Penalty if cache miss :
Intel i486 : 6/2 ; Unlocked/Locked
Cyrix Cx486SLC : 1 ; N/A
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Frog Killer Caught in the Act

Photo of a Panamanian golden frog.

A killer has been caught in the act: the first before-and-after view of an infectious disease that led to an amphibian die-off has been released by the scientists who tracked it.

The results are published this week in the journal Proceedings of the National Academy of Sciences (PNAS).

Like a wave, incidence of the fungal disease that wipes out Central American frogs--chytridiomycosis--advances through the region's highlands at a rate of about 30 kilometers ...

More at http://www.nsf.gov/news/news_summ.jsp?cntn_id=117348&WT.mc_id=USNSF_51&WT.mc_ev=click


This is an NSF News item.

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