In message <[EMAIL PROTECTED]>, Russell King writes:
>Philip Blundell said:
>> > 1: ldrbt r6,[r6],#0
>>
>> Technically the results are UNPREDICTABLE if the two registers are the same.
>
>This is not illegal, nor unpredictable. The documentation says that a
>post indexed ldr instruction must not have rd the same as rn, except in
>one case where it is permitted. The above is an example of the exact
>case when it is allowed.
Where is this documented? The ARM says of LDRBT simply:
Notes
Register Rn:
Specifies the base register used by <post_indexed_addressing_mode>.
Operand restrictions:
If the same register is specified for Rd and Rn the results are
UNPREDICTABLE.
This is on page 3-46.
p.
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