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DBG

In Armv8, DBG executes as a NOP. Arm deprecates any use of the DBG instruction.

It has encodings from the following instruction sets: A32 ( A1 ) and T32 ( T1 ) .

A1

313029282726252423222120191817161514131211109876543210
!= 1111001100100000(1)(1)(1)(1)(0)(0)(0)(0)1111option
cond

A1

DBG{<c>}{<q>} #<option>

// DBG executes as a NOP. The 'option' field is ignored

T1

15141312111098765432101514131211109876543210
111100111010(1)(1)(1)(1)10(0)0(0)0001111option

T1

DBG{<c>}{<q>} #<option>

// DBG executes as a NOP. The 'option' field is ignored

For more information about the constrained unpredictable behavior, see Architectural Constraints on UNPREDICTABLE behaviors.

Assembler Symbols

<c>

See Standard assembler syntax fields.

<q>

See Standard assembler syntax fields.

<option>

Is a 4-bit unsigned immediate, in the range 0 to 15, encoded in the "option" field.

Operation

if ConditionPassed() then
    EncodingSpecificOperations();
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