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| <h4 class="subsection">9.1.2 Architecture Extensions</h4> |
| |
| <p>The table below lists the permitted architecture extensions that are |
| supported by the assembler and the conditions under which they are |
| automatically enabled. |
| |
| <p>Multiple extensions may be specified, separated by a <code>+</code>. |
| Extension mnemonics may also be removed from those the assembler |
| accepts. This is done by prepending <code>no</code> to the option that adds |
| the extension. Extensions that are removed must be listed after all |
| extensions that have been added. |
| |
| <p>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. |
| |
| <p><table summary=""><tr align="left"><th valign="top" width="12%">Extension </th><th valign="top" width="17%">Minimum Architecture </th><th valign="top" width="17%">Enabled by default |
| </th><th valign="top" width="54%">Description |
| <br></th></tr><tr align="left"><td valign="top" width="12%"><code>compnum</code> </td><td valign="top" width="17%">ARMv8.2-A </td><td valign="top" width="17%">ARMv8.3-A or later |
| </td><td valign="top" width="54%">Enable the complex number SIMD extensions. This implies |
| <code>fp16</code> and <code>simd</code>. |
| <br></td></tr><tr align="left"><td valign="top" width="12%"><code>crc</code> </td><td valign="top" width="17%">ARMv8-A </td><td valign="top" width="17%">ARMv8.1-A or later |
| </td><td valign="top" width="54%">Enable CRC instructions. |
| <br></td></tr><tr align="left"><td valign="top" width="12%"><code>crypto</code> </td><td valign="top" width="17%">ARMv8-A </td><td valign="top" width="17%">No |
| </td><td valign="top" width="54%">Enable cryptographic extensions. This implies <code>fp</code>, <code>simd</code>, <code>aes</code> and <code>sha2</code>. |
| <br></td></tr><tr align="left"><td valign="top" width="12%"><code>aes</code> </td><td valign="top" width="17%">ARMv8-A </td><td valign="top" width="17%">No |
| </td><td valign="top" width="54%">Enable the AES cryptographic extensions. This implies <code>fp</code> and <code>simd</code>. |
| <br></td></tr><tr align="left"><td valign="top" width="12%"><code>sha2</code> </td><td valign="top" width="17%">ARMv8-A </td><td valign="top" width="17%">No |
| </td><td valign="top" width="54%">Enable the SHA2 cryptographic extensions. This implies <code>fp</code> and <code>simd</code>. |
| <br></td></tr><tr align="left"><td valign="top" width="12%"><code>sha3</code> </td><td valign="top" width="17%">ARMv8.2-A </td><td valign="top" width="17%">No |
| </td><td valign="top" width="54%">Enable the ARMv8.2-A SHA2 and SHA3 cryptographic extensions. This implies <code>fp</code>, <code>simd</code> and <code>sha2</code>. |
| <br></td></tr><tr align="left"><td valign="top" width="12%"><code>sm4</code> </td><td valign="top" width="17%">ARMv8.2-A </td><td valign="top" width="17%">No |
| </td><td valign="top" width="54%">Enable the ARMv8.2-A SM3 and SM4 cryptographic extensions. This implies <code>fp</code> and <code>simd</code>. |
| <br></td></tr><tr align="left"><td valign="top" width="12%"><code>fp</code> </td><td valign="top" width="17%">ARMv8-A </td><td valign="top" width="17%">ARMv8-A or later |
| </td><td valign="top" width="54%">Enable floating-point extensions. |
| <br></td></tr><tr align="left"><td valign="top" width="12%"><code>fp16</code> </td><td valign="top" width="17%">ARMv8.2-A </td><td valign="top" width="17%">ARMv8.2-A or later |
| </td><td valign="top" width="54%">Enable ARMv8.2 16-bit floating-point support. This implies |
| <code>fp</code>. |
| <br></td></tr><tr align="left"><td valign="top" width="12%"><code>lor</code> </td><td valign="top" width="17%">ARMv8-A </td><td valign="top" width="17%">ARMv8.1-A or later |
| </td><td valign="top" width="54%">Enable Limited Ordering Regions extensions. |
| <br></td></tr><tr align="left"><td valign="top" width="12%"><code>lse</code> </td><td valign="top" width="17%">ARMv8-A </td><td valign="top" width="17%">ARMv8.1-A or later |
| </td><td valign="top" width="54%">Enable Large System extensions. |
| <br></td></tr><tr align="left"><td valign="top" width="12%"><code>pan</code> </td><td valign="top" width="17%">ARMv8-A </td><td valign="top" width="17%">ARMv8.1-A or later |
| </td><td valign="top" width="54%">Enable Privileged Access Never support. |
| <br></td></tr><tr align="left"><td valign="top" width="12%"><code>profile</code> </td><td valign="top" width="17%">ARMv8.2-A </td><td valign="top" width="17%">No |
| </td><td valign="top" width="54%">Enable statistical profiling extensions. |
| <br></td></tr><tr align="left"><td valign="top" width="12%"><code>ras</code> </td><td valign="top" width="17%">ARMv8-A </td><td valign="top" width="17%">ARMv8.2-A or later |
| </td><td valign="top" width="54%">Enable the Reliability, Availability and Serviceability |
| extension. |
| <br></td></tr><tr align="left"><td valign="top" width="12%"><code>rcpc</code> </td><td valign="top" width="17%">ARMv8.2-A </td><td valign="top" width="17%">ARMv8.3-A or later |
| </td><td valign="top" width="54%">Enable the weak release consistency extension. |
| <br></td></tr><tr align="left"><td valign="top" width="12%"><code>rdma</code> </td><td valign="top" width="17%">ARMv8-A </td><td valign="top" width="17%">ARMv8.1-A or later |
| </td><td valign="top" width="54%">Enable ARMv8.1 Advanced SIMD extensions. This implies <code>simd</code>. |
| <br></td></tr><tr align="left"><td valign="top" width="12%"><code>simd</code> </td><td valign="top" width="17%">ARMv8-A </td><td valign="top" width="17%">ARMv8-A or later |
| </td><td valign="top" width="54%">Enable Advanced SIMD extensions. This implies <code>fp</code>. |
| <br></td></tr><tr align="left"><td valign="top" width="12%"><code>sve</code> </td><td valign="top" width="17%">ARMv8.2-A </td><td valign="top" width="17%">No |
| </td><td valign="top" width="54%">Enable the Scalable Vector Extensions. This implies <code>fp16</code>, |
| <code>simd</code> and <code>compnum</code>. |
| <br></td></tr><tr align="left"><td valign="top" width="12%"><code>dotprod</code> </td><td valign="top" width="17%">ARMv8.2-A </td><td valign="top" width="17%">ARMv8.4-A or later |
| </td><td valign="top" width="54%">Enable the Dot Product extension. This implies <code>simd</code>. |
| <br></td></tr><tr align="left"><td valign="top" width="12%"><code>fp16fml</code> </td><td valign="top" width="17%">ARMv8.2-A </td><td valign="top" width="17%">ARMv8.4-A or later |
| </td><td valign="top" width="54%">Enable ARMv8.2 16-bit floating-point multiplication variant support. |
| This implies <code>fp16</code>. |
| <br></td></tr><tr align="left"><td valign="top" width="12%"><code>sb</code> </td><td valign="top" width="17%">ARMv8-A </td><td valign="top" width="17%">ARMv8.5-A or later |
| </td><td valign="top" width="54%">Enable the speculation barrier instruction sb. |
| <br></td></tr><tr align="left"><td valign="top" width="12%"><code>predres</code> </td><td valign="top" width="17%">ARMv8-A </td><td valign="top" width="17%">ARMv8.5-A or later |
| </td><td valign="top" width="54%">Enable the Execution and Data and Prediction instructions. |
| <br></td></tr><tr align="left"><td valign="top" width="12%"><code>rng</code> </td><td valign="top" width="17%">ARMv8.5-A </td><td valign="top" width="17%">No |
| </td><td valign="top" width="54%">Enable ARMv8.5-A random number instructions. |
| <br></td></tr><tr align="left"><td valign="top" width="12%"><code>ssbs</code> </td><td valign="top" width="17%">ARMv8-A </td><td valign="top" width="17%">ARMv8.5-A or later |
| </td><td valign="top" width="54%">Enable Speculative Store Bypassing Safe state read and write. |
| <br></td></tr><tr align="left"><td valign="top" width="12%"><code>memtag</code> </td><td valign="top" width="17%">ARMv8.5-A </td><td valign="top" width="17%">No |
| </td><td valign="top" width="54%">Enable ARMv8.5-A Memory Tagging Extensions. |
| <br></td></tr><tr align="left"><td valign="top" width="12%"><code>tme</code> </td><td valign="top" width="17%">ARMv8-A </td><td valign="top" width="17%">No |
| </td><td valign="top" width="54%">Enable Transactional Memory Extensions. |
| <br></td></tr><tr align="left"><td valign="top" width="12%"><code>sve2</code> </td><td valign="top" width="17%">ARMv8-A </td><td valign="top" width="17%">No |
| </td><td valign="top" width="54%">Enable the SVE2 Extension. |
| <br></td></tr><tr align="left"><td valign="top" width="12%"><code>sve2-bitperm</code> </td><td valign="top" width="17%">ARMv8-A </td><td valign="top" width="17%">No |
| </td><td valign="top" width="54%">Enable SVE2 BITPERM Extension. |
| <br></td></tr><tr align="left"><td valign="top" width="12%"><code>sve2-sm4</code> </td><td valign="top" width="17%">ARMv8-A </td><td valign="top" width="17%">No |
| </td><td valign="top" width="54%">Enable SVE2 SM4 Extension. |
| <br></td></tr><tr align="left"><td valign="top" width="12%"><code>sve2-aes</code> </td><td valign="top" width="17%">ARMv8-A </td><td valign="top" width="17%">No |
| </td><td valign="top" width="54%">Enable SVE2 AES Extension. This also enables the .Q->.B form of the |
| <code>pmullt</code> and <code>pmullb</code> instructions. |
| <br></td></tr><tr align="left"><td valign="top" width="12%"><code>sve2-sha3</code> </td><td valign="top" width="17%">ARMv8-A </td><td valign="top" width="17%">No |
| </td><td valign="top" width="54%">Enable SVE2 SHA3 Extension. |
| <br></td></tr></table> |
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