Decode decodes the leading bytes in src as a single instruction.

GNUSyntax returns the GNU assembler syntax for the instruction, as defined by GNU binutils.

GoSyntax returns the Go assembler syntax for the instruction.

R – [R] but formats as R, for LDM/STM only.

R! - [R], X where X is instruction-specific amount, for LDM/STM only.

[R, X] – use address R + X.

[R], X – use address R, set R = R + X.

[R, X]! – use address R + X, set R = R + X.

right rotate.

right rotate through carry (Count will always be 1).

left shift.

logical (unsigned) right shift.

arithmetic (signed) right shift.