Author: Dann Corbit
Date: 17:04:04 07/03/02
Go up one level in this thread
On July 03, 2002 at 18:00:20, Dan Andersson wrote:
>I believe that depends on wher the data is stored. Registers, fine. Memory... :(
XCHG Exchange register/memory with register
operands bytes 8088 186 286 386 486 Pentium
reg, reg 2 4 4 3 3 3 3 NP
reg, mem 2+d(0-2) 25+EA 17 5 5 5 3 NP
mem, reg 2+d(0-2) 25+EA 17 5 5 5 3 NP
acc, reg 1 3 3 3 3 3 2 NP
reg, acc 1 3 3 3 3 3 2 NP
in above: acc = AX or EAX only
Example: xchg ax, dx
NP = not pairable
Of course, there must be a {large} read cost to fetch the item from memory if it
is not in the cache.
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