← Home

EON

Bitwise exclusive-OR with inverted immediate (unpredicated)

This instruction performs a bitwise exclusive-OR on an inverted immediate with each 64-bit element of the source vector, and destructively places the results in the corresponding elements of the source vector. The immediate is a 64-bit value consisting of a single run of ones or zeros repeating every 2, 4, 8, 16, 32 or 64 bits. This instruction is unpredicated.

This is a pseudo-instruction of EOR (immediate). This means:

SVE class

(FEAT_SVE || FEAT_SME)

313029282726252423222120191817161514131211109876543210
00000101010000imm13Zdn
opc

Encoding

EON <Zdn>.<T>, <Zdn>.<T>, #<const>

is equivalent to

EOR <Zdn>.<T>, <Zdn>.<T>, #(-<const> - 1)

Assembler Symbols

<Zdn>

Is the name of the source and destination scalable vector register, encoded in the "Zdn" field.

<T>

Is the size specifier, encoded in imm13:

imm13 <T>
0xxxxxx0xxxxx S
0xxxxxx10xxxx H
0xxxxxx110xxx B
0xxxxxx1110xx B
0xxxxxx11110x B
0xxxxxx11111x RESERVED
1xxxxxxxxxxxx D
<const>

Is a 64, 32, 16 or 8-bit bitmask consisting of replicated 2, 4, 8, 16, 32 or 64 bit fields, each field containing a rotated run of non-zero bits, encoded in the "imm13" field.

Operation

The description of EOR (immediate) gives the operational pseudocode for this instruction.

Operational Information

The description of EOR (immediate) gives the operational information for this instruction.


Version 2025.09 — Copyright © 2010-2025 Arm Limited or its affiliates.

This site is provided as a community resource and is NOT affiliated with nor endorsed by Arm Limited.