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ARM Compiler armasm User Guide : EON (shifted register)

EON (shifted register)

Bitwise Exclusive OR NOT (shifted register).

Syntax

EON Wd, Wn, Wm{, shift #amount} ; 32-bit general registers

EON Xd, Xn, Xm{, shift #amount} ; 64-bit general registers

Where:

Wd

Is the 32-bit name of the general-purpose destination register.

Wn

Is the 32-bit name of the first general-purpose source register.

Wm

Is the 32-bit name of the second general-purpose source register.

amount

Depends on the instruction variant:

32-bit general registers

Is the shift amount, in the range 0 to 31, defaulting to 0.

64-bit general registers

Is the shift amount, in the range 0 to 63, defaulting to 0.

Xd

Is the 64-bit name of the general-purpose destination register.

Xn

Is the 64-bit name of the first general-purpose source register.

Xm

Is the 64-bit name of the second general-purpose source register.

shift

Is the optional shift to be applied to the final source, defaulting to LSL, and can be one of LSL, LSR, ASR, or ROR.

Operation

Bitwise Exclusive OR NOT (shifted register) performs a bitwise Exclusive OR NOT of a register value and an optionally-shifted register value, and writes the result to the destination register.

Rd = Rn EOR NOT shift(Rm, amount), where R is either W or X.

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