From 3f5f54cd8bf73e7a271955582834fda9e707429d Mon Sep 17 00:00:00 2001
From: Adam Gemmell <adam.gemmell@arm.com>
Date: Wed, 28 Apr 2021 17:54:44 +0100
Subject: [PATCH] Update list of allowed aarch64 features

These features were recently added to std_detect. Features not supported
by LLVM 9, the current minimum version for Rust, are commented.
---
 compiler/rustc_codegen_llvm/src/llvm_util.rs  |  6 ++
 .../rustc_codegen_ssa/src/target_features.rs  | 87 +++++++++++++++++--
 2 files changed, 86 insertions(+), 7 deletions(-)

diff --git a/compiler/rustc_codegen_llvm/src/llvm_util.rs b/compiler/rustc_codegen_llvm/src/llvm_util.rs
index b44553e4f6d..f0a2c91c018 100644
--- a/compiler/rustc_codegen_llvm/src/llvm_util.rs
+++ b/compiler/rustc_codegen_llvm/src/llvm_util.rs
@@ -152,6 +152,12 @@ pub fn to_llvm_feature<'a>(sess: &Session, s: &'a str) -> &'a str {
         ("x86", "avx512vpclmulqdq") => "vpclmulqdq",
         ("aarch64", "fp") => "fp-armv8",
         ("aarch64", "fp16") => "fullfp16",
+        ("aarch64", "fhm") => "fp16fml",
+        ("aarch64", "lse2") => "outline-atomics",
+        ("aarch64", "rcpc2") => "rcpc-immo",
+        ("aarch64", "dpb") => "ccpp",
+        ("aarch64", "dpb2") => "ccdp",
+        ("aarch64", "fcma") => "complxnum",
         (_, s) => s,
     }
 }
diff --git a/compiler/rustc_codegen_ssa/src/target_features.rs b/compiler/rustc_codegen_ssa/src/target_features.rs
index 4e987908b4e..aa415754dad 100644
--- a/compiler/rustc_codegen_ssa/src/target_features.rs
+++ b/compiler/rustc_codegen_ssa/src/target_features.rs
@@ -33,22 +33,95 @@
     ("thumb-mode", Some(sym::arm_target_feature)),
 ];
 
+// Commented features are not available in LLVM 9.0, or have since been renamed
 const AARCH64_ALLOWED_FEATURES: &[(&str, Option<Symbol>)] = &[
-    ("fp", Some(sym::aarch64_target_feature)),
+    // FEAT_AdvSimd
     ("neon", Some(sym::aarch64_target_feature)),
-    ("sve", Some(sym::aarch64_target_feature)),
-    ("crc", Some(sym::aarch64_target_feature)),
-    ("crypto", Some(sym::aarch64_target_feature)),
-    ("ras", Some(sym::aarch64_target_feature)),
-    ("lse", Some(sym::aarch64_target_feature)),
-    ("rdm", Some(sym::aarch64_target_feature)),
+    // FEAT_FP
+    ("fp", Some(sym::aarch64_target_feature)),
+    // FEAT_FP16
     ("fp16", Some(sym::aarch64_target_feature)),
+    // FEAT_SVE
+    ("sve", Some(sym::aarch64_target_feature)),
+    // FEAT_CRC
+    ("crc", Some(sym::aarch64_target_feature)),
+    // Cryptographic extension
+    ("crypto", Some(sym::aarch64_target_feature)),
+    // FEAT_RAS
+    ("ras", Some(sym::aarch64_target_feature)),
+    // FEAT_LSE
+    ("lse", Some(sym::aarch64_target_feature)),
+    // FEAT_LSE2
+    // ("lse2", Some(sym::aarch64_target_feature)),
+    // FEAT_RDM
+    ("rdm", Some(sym::aarch64_target_feature)),
+    // FEAT_RCPC
     ("rcpc", Some(sym::aarch64_target_feature)),
+    // FEAT_RCPC2
+    ("rcpc2", Some(sym::aarch64_target_feature)),
+    // FEAT_DotProd
     ("dotprod", Some(sym::aarch64_target_feature)),
+    // FEAT_TME
     ("tme", Some(sym::aarch64_target_feature)),
+    // FEAT_FHM
+    ("fhm", Some(sym::aarch64_target_feature)),
+    // FEAT_DIT
+    ("dit", Some(sym::aarch64_target_feature)),
+    // FEAT_FLAGM
+    // ("flagm", Some(sym::aarch64_target_feature)),
+    // FEAT_SSBS
+    ("ssbs", Some(sym::aarch64_target_feature)),
+    // FEAT_SB
+    ("sb", Some(sym::aarch64_target_feature)),
+    // FEAT_PAUTH
+    // ("pauth", Some(sym::aarch64_target_feature)),
+    // FEAT_DPB
+    ("dpb", Some(sym::aarch64_target_feature)),
+    // FEAT_DPB2
+    ("dpb2", Some(sym::aarch64_target_feature)),
+    // FEAT_SVE2
+    ("sve2", Some(sym::aarch64_target_feature)),
+    // FEAT_SVE2_AES
+    ("sve2-aes", Some(sym::aarch64_target_feature)),
+    // FEAT_SVE2_SM4
+    ("sve2-sm4", Some(sym::aarch64_target_feature)),
+    // FEAT_SVE2_SHA3
+    ("sve2-sha3", Some(sym::aarch64_target_feature)),
+    // FEAT_SVE2_BitPerm
+    ("sve2-bitperm", Some(sym::aarch64_target_feature)),
+    // FEAT_FRINTTS
+    ("fptoint", Some(sym::aarch64_target_feature)),
+    // FEAT_I8MM
+    // ("i8mm", Some(sym::aarch64_target_feature)),
+    // FEAT_F32MM
+    // ("f32mm", Some(sym::aarch64_target_feature)),
+    // FEAT_F64MM
+    // ("f64mm", Some(sym::aarch64_target_feature)),
+    // FEAT_BF16
+    // ("bf16", Some(sym::aarch64_target_feature)),
+    // FEAT_RAND
+    ("rand", Some(sym::aarch64_target_feature)),
+    // FEAT_BTI
+    ("bti", Some(sym::aarch64_target_feature)),
+    // FEAT_MTE
+    ("mte", Some(sym::aarch64_target_feature)),
+    // FEAT_JSCVT
+    ("jsconv", Some(sym::aarch64_target_feature)),
+    // FEAT_FCMA
+    ("fcma", Some(sym::aarch64_target_feature)),
+    // FEAT_SHA1 & FEAT_SHA256
+    ("sha2", Some(sym::aarch64_target_feature)),
+    // FEAT_SHA512 & FEAT_SHA3
+    ("sha3", Some(sym::aarch64_target_feature)),
+    // FEAT_SM3 & FEAT_SM4
+    ("sm4", Some(sym::aarch64_target_feature)),
     ("v8.1a", Some(sym::aarch64_target_feature)),
     ("v8.2a", Some(sym::aarch64_target_feature)),
     ("v8.3a", Some(sym::aarch64_target_feature)),
+    ("v8.4a", Some(sym::aarch64_target_feature)),
+    ("v8.5a", Some(sym::aarch64_target_feature)),
+    // ("v8.6a", Some(sym::aarch64_target_feature)),
+    // ("v8.7a", Some(sym::aarch64_target_feature)),
 ];
 
 const X86_ALLOWED_FEATURES: &[(&str, Option<Symbol>)] = &[