Short form Mnemonic

Note: This was originally posted on 21st March 2011 at http://forums.arm.com

Hi.

Does anybody knows where I can find Short Form Mnemonic documentation.

For example
add r0, r0, r1

can be replace by
add r0, r1

Is it always the Rn register which is removed ???
what is the equivalent normal form for
mla r0, r1, r2

is it
mla r0, r0, r1, r2
or
mla r0, r1, r2, r0


Does it exist
mla r0, r1
for
mla r0, r0, r1, r0

Is it a ARM specification for short form mnemonic ?
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