Update ARM feature and CPU detection

* Clean up old LLVM version check
* Clean up old cores that'll probably not be used (and some that are removed from LLVM)
* Add document about data sources
* Update AArch64 feature list to match changes to the LLVM ones
* ARMv8.4 - ARMv8.6 support
* Add all known cores that I can find and all information I can find about them
* Remove a few A64 only cores from AArch32 CPU list
* Rename Apple cores (following LLVM)
* SVE register size

Co-authored-by: Ian <i.r.butterworth@gmail.com>

src/features_aarch32.h

@@ -1,5 +1,10 @@
 // This file is a part of Julia. License is MIT: https://julialang.org/license
 
+// Copy values `from arch/arm/include/uapi/asm/hwcap.h` from linux kernel source tree
+// and match LLVM names.
+
+// LLVM features in `llvm/lib/Target/ARM/ARM.td`
+
 // AArch32 features definition
 // hwcap
 JL_FEATURE_DEF(neon, 12, 0)
@@ -24,5 +29,8 @@ JL_FEATURE_DEF(v7, 32 * 2 + 3, 0)
 JL_FEATURE_DEF(v8, 32 * 2 + 4, 0)
 JL_FEATURE_DEF(v8_1a, 32 * 2 + 5, 0)
 JL_FEATURE_DEF(v8_2a, 32 * 2 + 6, 0)
-JL_FEATURE_DEF(v8_3a, 32 * 2 + 7, 60000)
+JL_FEATURE_DEF(v8_3a, 32 * 2 + 7, 0)
 JL_FEATURE_DEF(v8_m_main, 32 * 2 + 8, 0)
+JL_FEATURE_DEF(v8_4a, 32 * 2 + 9, 0)
+JL_FEATURE_DEF(v8_5a, 32 * 2 + 10, 0)
+JL_FEATURE_DEF(v8_6a, 32 * 2 + 11, 110000)

src/features_aarch64.h

@@ -1,25 +1,83 @@
 // This file is a part of Julia. License is MIT: https://julialang.org/license
 
+// Copy values `from arch/arm64/include/uapi/asm/hwcap.h` from linux kernel source tree
+// and match LLVM names.
+// See also https://www.kernel.org/doc/html/latest/arm64/elf_hwcaps.html
+
+// LLVM features in `llvm/lib/Target/AArch64/AArch64.td`
+
 // AArch64 features definition
 // hwcap
-JL_FEATURE_DEF(crypto, 3, 0)
-JL_FEATURE_DEF(crc, 7, 0)
-JL_FEATURE_DEF(lse, 8, 40000) // ARMv8.1-Atomics
-JL_FEATURE_DEF(fullfp16, 9, 0)
-JL_FEATURE_DEF(rdm, 12, 50000) // ARMv8.1-SIMD
-JL_FEATURE_DEF(jscvt, 13, UINT32_MAX) // Linux Kernel HWCAP name
-JL_FEATURE_DEF(fcma, 14, UINT32_MAX) // Linux Kernel HWCAP name
-JL_FEATURE_DEF(rcpc, 15, 60000)
-JL_FEATURE_DEF(dcpop, 16, UINT32_MAX) // Linux Kernel HWCAP name
-// JL_FEATURE_DEF(dotprod, ???, 60000) // ARMv8.2-DotProd
-// JL_FEATURE_DEF(ras, ???, 0)
-// JL_FEATURE_DEF(sve, ???, UINT32_MAX)
+// JL_FEATURE_DEF(fp, 0, 0) // HWCAP_HP. Required
+// JL_FEATURE_DEF(asimd, 1, 0) // HWCAP_ASIMD. Required
+// JL_FEATURE_DEF(evtstrm, 2, 0) // HWCAP_EVTSTRM. Not needed
+// JL_FEATURE_DEF(aes, 3, 0) // HWCAP_AES. Implied by `aes`
+JL_FEATURE_DEF(aes, 4, 0) // HWCAP_PMULL, ID_AA64ISAR0_EL1.AES == 2
+// JL_FEATURE_DEF(sha1, 5, UINT32_MAX) // HWCAP_SHA1. Implied by `sha2`
+JL_FEATURE_DEF(sha2, 6, 0) // HWCAP_SHA2
+JL_FEATURE_DEF(crc, 7, 0) // HWCAP_CRC32. Required in ARMv8.1
+JL_FEATURE_DEF(lse, 8, 0) // HWCAP_ATOMICS, ARMv8.1-Atomics. Required in ARMv8.1
+JL_FEATURE_DEF(fullfp16, 9, 0) // HWCAP_FPHP
+// JL_FEATURE_DEF(asimdhp, 10, 0) // HWCAP_ASIMDHP. Same as `fullfp16`
+// JL_FEATURE_DEF(cpuid, 11, 0) // HWCAP_CPUID. Not needed
+JL_FEATURE_DEF(rdm, 12, 0) // HWCAP_ASIMDRDM, ARMv8.1-SIMD. Required in ARMv8.1
+JL_FEATURE_DEF(jsconv, 13, 0) // HWCAP_JSCVT. Required in ARMv8.3
+JL_FEATURE_DEF(complxnum, 14, 0) // HWCAP_FCMA. Required in ARMv8.3
+JL_FEATURE_DEF(rcpc, 15, 0) // HWCAP_LRCPC, ARMv8.3-RCPC. Required in ARMv8.3
+JL_FEATURE_DEF(ccpp, 16, 0) // HWCAP_DCPOP, ARMv8.2-DCPoP. Required in ARMv8.2
+JL_FEATURE_DEF(sha3, 17, 0) // HWCAP_SHA3. ARMv8.2-SHA
+// JL_FEATURE_DEF(sm3, 18, 0) // HWCAP_SM3. Same as `sm4`
+JL_FEATURE_DEF(sm4, 19, 0) // HWCAP_SM4, ARMv8.2-SM
+JL_FEATURE_DEF(dotprod, 20, 0) // HWCAP_ASIMDDP, ARMv8.2-DotProd
+// JL_FEATURE_DEF(sha512, 21, UINT32_MAX) // HWCAP_SHA512. Not implement in LLVM yet
+JL_FEATURE_DEF(sve, 22, 0) // HWCAP_SVE
+JL_FEATURE_DEF(fp16fml, 23, 0) // HWCAP_ASIMDFHM, ARMv8.2-FHM
+JL_FEATURE_DEF(dit, 24, 0) // HWCAP_DIT, ARMv8.4-DIT. Required in ARMv8.4
+// JL_FEATURE_DEF(uscat, 25, UINT32_MAX) // HWCAP_USCAT, ARMv8.4-LSE
+JL_FEATURE_DEF_NAME(rcpc_immo, 26, 0, "rcpc-immo") // HWCAP_ILRCPC, ARMv8.4-RCPC. Required in ARMv8.4
+JL_FEATURE_DEF(fmi, 27, 0) // HWCAP_FLAGM, ARMv8.4-CondM. Requird in ARMv8.4
+JL_FEATURE_DEF(ssbs, 28, 0) // HWCAP_SSBS
+JL_FEATURE_DEF(sb, 29, 0) // HWCAP_SB. Required in ARMv8.5
+JL_FEATURE_DEF(pa, 30, 0) // HWCAP_PACA
+// JL_FEATURE_DEF(pa, 31, 0) // HWCAP_PACG. Merged with `pa`.
 
 // hwcap2
-// JL_FEATURE_DEF(?, 32 + ?, 0)
+JL_FEATURE_DEF(ccdp, 32 + 0, 0) // HWCAP2_DCPODP, ARMv8.2-DCCVADP. Required in ARMv8.5
+JL_FEATURE_DEF(sve2, 32 + 1, 90000) // HWCAP2_SVE2
+// JL_FEATURE_DEF_NAME(sve2_aes, 32 + 2, 90000, "sve2-aes") // HWCAP2_SVEAES, Implied by `sve2-aes`
+JL_FEATURE_DEF_NAME(sve2_aes, 32 + 3, 90000, "sve2-aes") // HWCAP2_SVEPMULL, ID_AA64ZFR0_EL1.AES == 2
+JL_FEATURE_DEF_NAME(sve2_bitperm, 32 + 4, 100000, "sve2-bitperm") // HWCAP2_SVEBITPERM
+JL_FEATURE_DEF_NAME(sve2_sha3, 32 + 5, 90000, "sve2-sha3") // HWCAP2_SVESHA3
+JL_FEATURE_DEF_NAME(sve2_sm4, 32 + 6, 90000, "sve2-sm4") // HWCAP2_SM4
+JL_FEATURE_DEF(altnzcv, 32 + 7, 0) // HWCAP2_FLAGM2, ARMv8.5-CondM. Required in ARMv8.5
+JL_FEATURE_DEF(fptoint, 32 + 8, 0) // HWCAP2_FRINT. Required in ARMv8.5
+// JL_FEATURE_DEF(svei8mm, 32 + 9, UINT32_MAX) // HWCAP2_SVEI8MM, ARMv8.2-I8MM. Same as `i8mm`
+JL_FEATURE_DEF(f32mm, 32 + 10, 110000) // HWCAP2_SVEF32MM, ARMv8.2-F32MM
+JL_FEATURE_DEF(f64mm, 32 + 11, 110000) // HWCAP2_SVEF64MM, ARMv8.2-F64MM
+// JL_FEATURE_DEF(svebf16, 32 + 12, UINT32_MAX) // HWCAP2_SVEBF16, ARMv8.2-BF16. Same as `bf16`
+JL_FEATURE_DEF(i8mm, 32 + 13, 110000) // HWCAP2_I8MM, ARMv8.2-I8MM. Required in ARMv8.6
+JL_FEATURE_DEF(bf16, 32 + 14, 110000) // HWCAP2_BF16, ARMv8.2-BF16. Required in ARMv8.6
+// JL_FEATURE_DEF(dgh, 32 + 15, UINT32_MAX) // HWCAP2_DGH, ARMv8.0-DGH. Not implement in LLVM yet
+JL_FEATURE_DEF(rand, 32 + 16, 0) // HWCAP2_RNG, ARMv8.5-RNG
+JL_FEATURE_DEF(bti, 32 + 17, 0) // HWCAP2_BTI
 
 // custom bits to match llvm model
 JL_FEATURE_DEF(v8_1a, 32 * 2 + 0, 0)
 JL_FEATURE_DEF(v8_2a, 32 * 2 + 1, 0)
-JL_FEATURE_DEF(v8_3a, 32 * 2 + 2, 60000)
-// JL_FEATURE_DEF(v8_4a, 32 * 2 + 3, ???)
+JL_FEATURE_DEF(v8_3a, 32 * 2 + 2, 0)
+JL_FEATURE_DEF(v8_4a, 32 * 2 + 3, 0)
+JL_FEATURE_DEF(v8_5a, 32 * 2 + 4, 0)
+JL_FEATURE_DEF(v8_6a, 32 * 2 + 5, 110000)
+
+// Missing LLVM features available at EL0:
+// tme: ID_AA64ISAR0_EL1.TME (0b1) (LLVM 10)
+// am: ID_AA64PFR0_EL1.AMU (0b1, 0b10)
+// specrestrict: ID_AA64PFR0_EL1.CSV2 (0b10)
+// predres: ID_AA64PFR0_EL1.CSV3 (0b1)
+// mte: ID_AA64PFR1_EL1.MTE (0b1, 0b10)
+// ecv: ID_AA64MMFR0_EL1.ECV (0b1, 0b10) (LLVM 11)
+// lor: ID_AA64MMFR1_EL1.LO (0b1)
+// perfmon: ID_AA64DFR0_EL1.PMUVer (0b1, 0b100, 0b101, 0b110)
+// spe: ID_AA64DFR0_EL1.PMSVer (0b1 or 0b10)
+// tracev8.4: ID_AA64DFR0_EL1.TraceFilt (0b1)
+// ete: ???