| neon | Enable Advanced SIMD instructions. | ⛔️ |
| fp16 | Full FP16. | ⛔️ |
| sve | Enable Scalable Vector Extension (SVE) instructions. | ⛔️ |
| crc | Enable ARMv8 CRC-32 checksum instructions. | ⛔️ |
| ras | Enable ARMv8 Reliability, Availability and Serviceability Extensions. | ⛔️ |
| lse | Enable ARMv8.1 Large System Extension (LSE) atomic instructions. | ⛔️ |
| rdm | Enable ARMv8.1 Rounding Double Multiply Add/Subtract instructions. | ⛔️ |
| rcpc | Enable support for RCPC extension. | ⛔️ |
| rcpc2 | Enable v8.4-A RCPC instructions with Immediate Offsets. | ⛔️ |
| dotprod | Enable dot product support. | ⛔️ |
| tme | Enable Transactional Memory Extension. | ⛔️ |
| fhm | Enable FP16 FML instructions. | ⛔️ |
| dit | Enable v8.4-A Data Independent Timing instructions. | ⛔️ |
| flagm | Enable v8.4-A Flag Manipulation Instructions. | ⛔️ |
| ssbs | Enable Speculative Store Bypass Safe bit. | ⛔️ |
| sb | Enable v8.5 Speculation Barrier. | ⛔️ |
| paca | Enable v8.3-A Pointer Authentication extension. | ⛔️ |
| dpb | Enable v8.2 data Cache Clean to Point of Persistence. | ⛔️ |
| dpb2 | Enable v8.5 Cache Clean to Point of Deep Persistence. | ⛔️ |
| sve2 | Enable Scalable Vector Extension 2 (SVE2) instructions. | ⛔️ |
| sve2-aes | Enable AES SVE2 instructions. | ⛔️ |
| sve2-sm4 | Enable SM4 SVE2 instructions. | ⛔️ |
| sve2-sha3 | Enable SHA3 SVE2 instructions. | ⛔️ |
| sve2-bitperm | Enable bit permutation SVE2 instructions. | ⛔️ |
| frintts | Enable FRInt[32|64][Z|X] instructions that round a floating-point number to an integer (in FP format) forcing it to fit into a 32- or 64-bit int. | ⛔️ |
| i8mm | Enable Matrix Multiply Int8 Extension. | ⛔️ |
| f32mm | Enable Matrix Multiply FP32 Extension. | ⛔️ |
| f64mm | Enable Matrix Multiply FP64 Extension. | ⛔️ |
| bf16 | Enable BFloat16 Extension. | ⛔️ |
| rand | Enable Random Number generation instructions. | ⛔️ |
| bti | Enable Branch Target Identification. | ⛔️ |
| mte | Enable Memory Tagging Extension. | ⛔️ |
| jsconv | Enable v8.3-A JavaScript FP conversion instructions. | ⛔️ |
| fcma | Enable v8.3-A Floating-point complex number support. | ⛔️ |
| aes | Enable AES support. | ⛔️ |
| sha2 | Enable SHA1 and SHA256 support. | ⛔️ |
| sha3 | Enable SHA512 and SHA3 support. | ⛔️ |
| sm4 | Enable SM3 and SM4 support. | ⛔️ |
| pan | Enables ARM v8.1 Privileged Access-Never extension. | ⛔️ |
| lor | Enables ARM v8.1 Limited Ordering Regions extension. | ⛔️ |
| vh | Enables ARM v8.1 Virtual Host extension. | ⛔️ |
| pmuv3 | Enable ARMv8 PMUv3 Performance Monitors extension. | ⛔️ |
| spe | Enable Statistical Profiling extension. | ⛔️ |
| v8.1a | Support ARM v8.1a instructions. | ⛔️ |
| v8.2a | Support ARM v8.2a instructions. | ⛔️ |
| v8.3a | Support ARM v8.3a instructions. | ⛔️ |
| v8.4a | Support ARM v8.4a instructions. | ⛔️ |
| v8.5a | Support ARM v8.5a instructions. | ⛔️ |
| v8.6a | Support ARM v8.6a instructions. | ⛔️ |
| v8.7a | Support ARM v8.7a instructions. | ⛔️ |
| crt-static | Enables C Run-time Libraries to be statically linked. | ⛔️ |
| CONTEXTIDREL2 | Enable RW operand CONTEXTIDR_EL2. | ✅ |
| a35 | Cortex-A35 ARM processors. | ✅ |
| a510 | Cortex-A510 ARM processors. | ✅ |
| a53 | Cortex-A53 ARM processors. | ✅ |
| a55 | Cortex-A55 ARM processors. | ✅ |
| a57 | Cortex-A57 ARM processors. | ✅ |
| a64fx | Fujitsu A64FX processors. | ✅ |
| a65 | Cortex-A65 ARM processors. | ✅ |
| a710 | Cortex-A710 ARM processors. | ✅ |
| a72 | Cortex-A72 ARM processors. | ✅ |
| a73 | Cortex-A73 ARM processors. | ✅ |
| a75 | Cortex-A75 ARM processors. | ✅ |
| a76 | Cortex-A76 ARM processors. | ✅ |
| a77 | Cortex-A77 ARM processors. | ✅ |
| a78 | Cortex-A78 ARM processors. | ✅ |
| a78c | Cortex-A78C ARM processors. | ✅ |
| aggressive-fma | Enable Aggressive FMA for floating-point.. | ✅ |
| all | Enable all instructions. | ✅ |
| alternate-sextload-cvt-f32-pattern | Use alternative pattern for sextload convert to f32. | ✅ |
| altnzcv | Enable alternative NZCV format for floating point comparisons. | ✅ |
| am | Enable v8.4-A Activity Monitors extension. | ✅ |
| ampere1 | Ampere Computing Ampere-1 processors. | ✅ |
| amvs | Enable v8.6-A Activity Monitors Virtualization support. | ✅ |
| apple-a10 | Apple A10. | ✅ |
| apple-a11 | Apple A11. | ✅ |
| apple-a12 | Apple A12. | ✅ |
| apple-a13 | Apple A13. | ✅ |
| apple-a14 | Apple A14. | ✅ |
| apple-a7 | Apple A7 (the CPU formerly known as Cyclone). | ✅ |
| apple-a7-sysreg | Apple A7 (the CPU formerly known as Cyclone). | ✅ |
| arith-bcc-fusion | CPU fuses arithmetic+bcc operations. | ✅ |
| arith-cbz-fusion | CPU fuses arithmetic + cbz/cbnz operations. | ✅ |
| ascend-store-address | Schedule vector stores by ascending address. | ✅ |
| balance-fp-ops | balance mix of odd and even D-registers for fp multiply(-accumulate) ops. | ✅ |
| brbe | Enable Branch Record Buffer Extension. | ✅ |
| call-saved-x10 | Make X10 callee saved.. | ✅ |
| call-saved-x11 | Make X11 callee saved.. | ✅ |
| call-saved-x12 | Make X12 callee saved.. | ✅ |
| call-saved-x13 | Make X13 callee saved.. | ✅ |
| call-saved-x14 | Make X14 callee saved.. | ✅ |
| call-saved-x15 | Make X15 callee saved.. | ✅ |
| call-saved-x18 | Make X18 callee saved.. | ✅ |
| call-saved-x8 | Make X8 callee saved.. | ✅ |
| call-saved-x9 | Make X9 callee saved.. | ✅ |
| carmel | Nvidia Carmel processors. | ✅ |
| ccidx | Enable v8.3-A Extend of the CCSIDR number of sets. | ✅ |
| cmp-bcc-fusion | CPU fuses cmp+bcc operations. | ✅ |
| cortex-r82 | Cortex-R82 ARM processors. | ✅ |
| cortex-x1 | Cortex-X1 ARM processors. | ✅ |
| cortex-x2 | Cortex-X2 ARM processors. | ✅ |
| crypto | Enable cryptographic instructions. | ✅ |
| custom-cheap-as-move | Use custom handling of cheap instructions. | ✅ |
| disable-latency-sched-heuristic | Disable latency scheduling heuristic. | ✅ |
| ecv | Enable enhanced counter virtualization extension. | ✅ |
| el2vmsa | Enable Exception Level 2 Virtual Memory System Architecture. | ✅ |
| el3 | Enable Exception Level 3. | ✅ |
| ete | Enable Embedded Trace Extension. | ✅ |
| exynos-cheap-as-move | Use Exynos specific handling of cheap instructions. | ✅ |
| exynosm3 | Samsung Exynos-M3 processors. | ✅ |
| exynosm4 | Samsung Exynos-M4 processors. | ✅ |
| falkor | Qualcomm Falkor processors. | ✅ |
| fgt | Enable fine grained virtualization traps extension. | ✅ |
| fix-cortex-a53-835769 | Mitigate Cortex-A53 Erratum 835769. | ✅ |
| force-32bit-jump-tables | Force jump table entries to be 32-bits wide except at MinSize. | ✅ |
| fp-armv8 | Enable ARMv8 FP. | ✅ |
| fuse-address | CPU fuses address generation and memory operations. | ✅ |
| fuse-adrp-add | CPU fuses adrp+add operations. | ✅ |
| fuse-aes | CPU fuses AES crypto operations. | ✅ |
| fuse-arith-logic | CPU fuses arithmetic and logic operations. | ✅ |
| fuse-crypto-eor | CPU fuses AES/PMULL and EOR operations. | ✅ |
| fuse-csel | CPU fuses conditional select operations. | ✅ |
| fuse-literals | CPU fuses literal generation operations. | ✅ |
| harden-sls-blr | Harden against straight line speculation across BLR instructions. | ✅ |
| harden-sls-nocomdat | Generate thunk code for SLS mitigation in the normal text section. | ✅ |
| harden-sls-retbr | Harden against straight line speculation across RET and BR instructions. | ✅ |
| hbc | Enable Armv8.8-A Hinted Conditional Branches Extension. | ✅ |
| hcx | Enable Armv8.7-A HCRX_EL2 system register. | ✅ |
| kryo | Qualcomm Kryo processors. | ✅ |
| ldapr | Use LDAPR to lower atomic loads; experimental until we have more testing/a formal correctness proof. | ✅ |
| ls64 | Enable Armv8.7-A LD64B/ST64B Accelerator Extension. | ✅ |
| lse2 | Enable ARMv8.4 Large System Extension 2 (LSE2) atomicity rules. | ✅ |
| lsl-fast | CPU has a fastpath logical shift of up to 3 places. | ✅ |
| mops | Enable Armv8.8-A memcpy and memset acceleration instructions. | ✅ |
| mpam | Enable v8.4-A Memory system Partitioning and Monitoring extension. | ✅ |
| neoverse512tvb | Neoverse 512-TVB ARM processors. | ✅ |
| neoversee1 | Neoverse E1 ARM processors. | ✅ |
| neoversen1 | Neoverse N1 ARM processors. | ✅ |
| neoversen2 | Neoverse N2 ARM processors. | ✅ |
| neoversev1 | Neoverse V1 ARM processors. | ✅ |
| no-bti-at-return-twice | Don't place a BTI instruction after a return-twice. | ✅ |
| no-neg-immediates | Convert immediates and instructions to their negated or complemented equivalent when the immediate does not fit in the encoding.. | ✅ |
| no-zcz-fp | Has no zero-cycle zeroing instructions for FP registers. | ✅ |
| nv | Enable v8.4-A Nested Virtualization Enchancement. | ✅ |
| outline-atomics | Enable out of line atomics to support LSE instructions. | ✅ |
| pan-rwv | Enable v8.2 PAN s1e1R and s1e1W Variants. | ✅ |
| predictable-select-expensive | Prefer likely predicted branches over selects. | ✅ |
| predres | Enable v8.5a execution and data prediction invalidation instructions. | ✅ |
| reserve-x1 | Reserve X1, making it unavailable as a GPR. | ✅ |
| reserve-x10 | Reserve X10, making it unavailable as a GPR. | ✅ |
| reserve-x11 | Reserve X11, making it unavailable as a GPR. | ✅ |
| reserve-x12 | Reserve X12, making it unavailable as a GPR. | ✅ |
| reserve-x13 | Reserve X13, making it unavailable as a GPR. | ✅ |
| reserve-x14 | Reserve X14, making it unavailable as a GPR. | ✅ |
| reserve-x15 | Reserve X15, making it unavailable as a GPR. | ✅ |
| reserve-x18 | Reserve X18, making it unavailable as a GPR. | ✅ |
| reserve-x2 | Reserve X2, making it unavailable as a GPR. | ✅ |
| reserve-x20 | Reserve X20, making it unavailable as a GPR. | ✅ |
| reserve-x21 | Reserve X21, making it unavailable as a GPR. | ✅ |
| reserve-x22 | Reserve X22, making it unavailable as a GPR. | ✅ |
| reserve-x23 | Reserve X23, making it unavailable as a GPR. | ✅ |
| reserve-x24 | Reserve X24, making it unavailable as a GPR. | ✅ |
| reserve-x25 | Reserve X25, making it unavailable as a GPR. | ✅ |
| reserve-x26 | Reserve X26, making it unavailable as a GPR. | ✅ |
| reserve-x27 | Reserve X27, making it unavailable as a GPR. | ✅ |
| reserve-x28 | Reserve X28, making it unavailable as a GPR. | ✅ |
| reserve-x3 | Reserve X3, making it unavailable as a GPR. | ✅ |
| reserve-x30 | Reserve X30, making it unavailable as a GPR. | ✅ |
| reserve-x4 | Reserve X4, making it unavailable as a GPR. | ✅ |
| reserve-x5 | Reserve X5, making it unavailable as a GPR. | ✅ |
| reserve-x6 | Reserve X6, making it unavailable as a GPR. | ✅ |
| reserve-x7 | Reserve X7, making it unavailable as a GPR. | ✅ |
| reserve-x9 | Reserve X9, making it unavailable as a GPR. | ✅ |
| rme | Enable Realm Management Extension. | ✅ |
| saphira | Qualcomm Saphira processors. | ✅ |
| sel2 | Enable v8.4-A Secure Exception Level 2 extension. | ✅ |
| slow-misaligned-128store | Misaligned 128 bit stores are slow. | ✅ |
| slow-paired-128 | Paired 128 bit loads and stores are slow. | ✅ |
| slow-strqro-store | STR of Q register with register offset is slow. | ✅ |
| sme | Enable Scalable Matrix Extension (SME). | ✅ |
| sme-f64 | Enable Scalable Matrix Extension (SME) F64F64 instructions. | ✅ |
| sme-i64 | Enable Scalable Matrix Extension (SME) I16I64 instructions. | ✅ |
| spe-eef | Enable extra register in the Statistical Profiling Extension. | ✅ |
| specrestrict | Enable architectural speculation restriction. | ✅ |
| strict-align | Disallow all unaligned memory access. | ✅ |
| tagged-globals | Use an instruction sequence for taking the address of a global that allows a memory tag in the upper address bits. | ✅ |
| thunderx | Cavium ThunderX processors. | ✅ |
| thunderx2t99 | Cavium ThunderX2 processors. | ✅ |
| thunderx3t110 | Marvell ThunderX3 processors. | ✅ |
| thunderxt81 | Cavium ThunderX processors. | ✅ |
| thunderxt83 | Cavium ThunderX processors. | ✅ |
| thunderxt88 | Cavium ThunderX processors. | ✅ |
| tlb-rmi | Enable v8.4-A TLB Range and Maintenance Instructions. | ✅ |
| tpidr-el1 | Permit use of TPIDR_EL1 for the TLS base. | ✅ |
| tpidr-el2 | Permit use of TPIDR_EL2 for the TLS base. | ✅ |
| tpidr-el3 | Permit use of TPIDR_EL3 for the TLS base. | ✅ |
| tracev8.4 | Enable v8.4-A Trace extension. | ✅ |
| trbe | Enable Trace Buffer Extension. | ✅ |
| tsv110 | HiSilicon TS-V110 processors. | ✅ |
| uaops | Enable v8.2 UAO PState. | ✅ |
| use-experimental-zeroing-pseudos | Hint to the compiler that the MOVPRFX instruction is merged with destructive operations. | ✅ |
| use-postra-scheduler | Schedule again after register allocation. | ✅ |
| use-reciprocal-square-root | Use the reciprocal square root approximation. | ✅ |
| use-scalar-inc-vl | Prefer inc/dec over add+cnt. | ✅ |
| v8.8a | Support ARM v8.8a instructions. | ✅ |
| v8a | Support ARM v8.0a instructions. | ✅ |
| v8r | Support ARM v8r instructions. | ✅ |
| v9.1a | Support ARM v9.1a instructions. | ✅ |
| v9.2a | Support ARM v9.2a instructions. | ✅ |
| v9.3a | Support ARM v9.3a instructions. | ✅ |
| v9a | Support ARM v9a instructions. | ✅ |
| wfxt | Enable Armv8.7-A WFET and WFIT instruction. | ✅ |
| xs | Enable Armv8.7-A limited-TLB-maintenance instruction. | ✅ |
| zcm | Has zero-cycle register moves. | ✅ |
| zcz | Has zero-cycle zeroing instructions. | ✅ |
| zcz-fp-workaround | The zero-cycle floating-point zeroing instruction has a bug. | ✅ |
| zcz-gp | Has zero-cycle zeroing instructions for generic registers. | ✅ |