AArch64 Extensions (Using as)

9.1.2 Architecture Extensions

The table below lists the permitted architecture extensions that are supported by the assembler and the conditions under which they are automatically enabled.

Multiple extensions may be specified, separated by a +. Extension mnemonics may also be removed from those the assembler accepts. This is done by prepending no to the option that adds the extension. Extensions that are removed must be listed after all extensions that have been added.

Enabling an extension that requires other extensions will automatically cause those extensions to be enabled. Similarly, disabling an extension that is required by other extensions will automatically cause those extensions to be disabled.

Extension	Minimum Architecture	Enabled by default	Description
`aes`	ARMv8-A	No	Enable the AES cryptographic extensions. This implies `fp` and `simd`.
`bf16`	ARMv8.2-A	ARMv8.6-A or later	Enable BFloat16 extension.
`compnum`	ARMv8.2-A	ARMv8.3-A or later	Enable the complex number SIMD extensions. This implies `fp16` and `simd`.
`crc`	ARMv8-A	ARMv8.1-A or later	Enable CRC instructions.
`crypto`	ARMv8-A	No	Enable cryptographic extensions. This implies `fp`, `simd`, `aes` and `sha2`.
`dotprod`	ARMv8.2-A	ARMv8.4-A or later	Enable the Dot Product extension. This implies `simd`.
`f32mm`	ARMv8.2-A	No	Enable F32 Matrix Multiply extension. This implies `sve`.
`f64mm`	ARMv8.2-A	No	Enable F64 Matrix Multiply extension. This implies `sve`.
`flagm`	ARMv8-A	ARMv8.4-A or later	Enable Flag Manipulation instructions.
`fp16fml`	ARMv8.2-A	ARMv8.4-A or later	Enable ARMv8.2 16-bit floating-point multiplication variant support. This implies `fp` and `fp16`.
`fp16`	ARMv8.2-A	ARMv8.2-A or later	Enable ARMv8.2 16-bit floating-point support. This implies `fp`.
`fp`	ARMv8-A	ARMv8-A or later	Enable floating-point extensions.
`hbc`		Armv8.8-A or later	Enable Armv8.8-A hinted conditional branch instructions
`i8mm`	ARMv8.2-A	ARMv8.6-A or later	Enable Int8 Matrix Multiply extension.
`lor`	ARMv8-A	ARMv8.1-A or later	Enable Limited Ordering Regions extensions.
`ls64`	ARMv8.6-A	ARMv8.7-A or later	Enable 64 Byte Loads/Stores.
`lse`	ARMv8-A	ARMv8.1-A or later	Enable Large System extensions.
`memtag`	ARMv8.5-A	No	Enable ARMv8.5-A Memory Tagging Extensions.
`mops`		Armv8.8-A or later	Enable Armv8.8-A memcpy and memset acceleration instructions
`pan`	ARMv8-A	ARMv8.1-A or later	Enable Privileged Access Never support.
`pauth`	ARMv8-A	No	Enable Pointer Authentication.
`predres`	ARMv8-A	ARMv8.5-A or later	Enable the Execution and Data and Prediction instructions.
`profile`	ARMv8.2-A	No	Enable statistical profiling extensions.
`ras`	ARMv8-A	ARMv8.2-A or later	Enable the Reliability, Availability and Serviceability extension.
`rcpc`	ARMv8.2-A	ARMv8.3-A or later	Enable the weak release consistency extension.
`rdma`	ARMv8-A	ARMv8.1-A or later	Enable ARMv8.1 Advanced SIMD extensions. This implies `simd`.
`rng`	ARMv8.5-A	No	Enable ARMv8.5-A random number instructions.
`sb`	ARMv8-A	ARMv8.5-A or later	Enable the speculation barrier instruction sb.
`sha2`	ARMv8-A	No	Enable the SHA2 cryptographic extensions. This implies `fp` and `simd`.
`sha3`	ARMv8.2-A	No	Enable the ARMv8.2-A SHA2 and SHA3 cryptographic extensions. This implies `fp`, `simd` and `sha2`.
`simd`	ARMv8-A	ARMv8-A or later	Enable Advanced SIMD extensions. This implies `fp`.
`sm4`	ARMv8.2-A	No	Enable the ARMv8.2-A SM3 and SM4 cryptographic extensions. This implies `fp` and `simd`.
`sme`	Armv9-A	No	Enable SME Extension.
`sme-f64`	Armv9-A	No	Enable SME F64 Extension.
`sme-i64`	Armv9-A	No	Enable SME I64 Extension.
`ssbs`	ARMv8-A	ARMv8.5-A or later	Enable Speculative Store Bypassing Safe state read and write.
`sve`	ARMv8.2-A	Armv9-A or later	Enable the Scalable Vector Extensions. This implies `fp16`, `simd` and `compnum`.
`sve2`	ARMv8-A	Armv9-A or later	Enable the SVE2 Extension. This implies `sve`.
`sve2-aes`	ARMv8-A	No	Enable SVE2 AES Extension. This also enables the .Q->.B form of the `pmullt` and `pmullb` instructions. This implies `aes` and `sve2`.
`sve2-bitperm`	ARMv8-A	No	Enable SVE2 BITPERM Extension.
`sve2-sha3`	ARMv8-A	No	Enable SVE2 SHA3 Extension. This implies `sha3` and `sve2`.
`sve2-sm4`	ARMv8-A	No	Enable SVE2 SM4 Extension. This implies `sm4` and `sve2`.
`tme`	ARMv8-A	No	Enable Transactional Memory Extensions.