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#### 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
--- | --- | --- | ---
`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`.
`aes` | ARMv8-A | No | Enable the AES cryptographic extensions. This implies `fp` and `simd`.
`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`.
`sm4` | ARMv8.2-A | No | Enable the ARMv8.2-A SM3 and SM4 cryptographic extensions. This implies `fp` and `simd`.
`fp` | ARMv8-A | ARMv8-A or later | Enable floating-point extensions.
`fp16` | ARMv8.2-A | ARMv8.2-A or later | Enable ARMv8.2 16-bit floating-point support. This implies `fp`.
`lor` | ARMv8-A | ARMv8.1-A or later | Enable Limited Ordering Regions extensions.
`lse` | ARMv8-A | ARMv8.1-A or later | Enable Large System extensions.
`pan` | ARMv8-A | ARMv8.1-A or later | Enable Privileged Access Never support.
`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`.
`simd` | ARMv8-A | ARMv8-A or later | Enable Advanced SIMD extensions. This implies `fp`.
`sve` | ARMv8.2-A | No | Enable the Scalable Vector Extensions. This implies `fp16`, `simd` and `compnum`.
`dotprod` | ARMv8.2-A | ARMv8.4-A or later | Enable the Dot Product extension. This implies `simd`.
`fp16fml` | ARMv8.2-A | ARMv8.4-A or later | Enable ARMv8.2 16-bit floating-point multiplication variant support. This implies `fp16`.

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