|
| |
Load String
|
86/88 |
Y |
186 |
Y |
286 |
Y |
386 |
Y |
486 |
Y |
LODS/LODSB/LODSW/LODSD source |
|
Ovfl |
N |
Dir |
N |
Int |
N |
Trap |
N |
Sign |
N |
Zero |
N |
Aux |
N |
Prty |
N |
Carry |
N |
LODS transfers the value (word or byte) pointed to by DS:SI into AX or
AL. It also increments or decrements SI (depending on the state of
the Direction Flag) to point to the next element.
Notes: This instruction is always translated by the
assembler into either LODSB, Load String Byte, or
LODSW, Load String Word, depending upon whether
source-str refers to a string of bytes or words. In
either case, however, you must explicitly load the
SI register with the offset of the string.
Although it is legal to repeat this instruction, it
is almost never done since doing so would
continually overwrite the value in AL.
------------------------------------ Timing ----------------------------------
OpCode Instruction 386 286 86
AC LODS m16 5 5 12
AD LODS m16 5 5 12
AD LODS m32 5
AC LODSB 5 5 12
AD LODSW 5 5 12
AD LODSD 5
------------------------------------ Logic -----------------------------------
AL = (DS:SI)
If DF = 0 then
SI = SI + n
else
SI = SI - n
See Also CMPS MOVS SCAS STOS REP REPE REPNE CLD STD |