Rollup merge of rust-lang#116943 - heiher:target-features, r=wesleywiser

Add target features for LoongArch

Author: matthiaskrgr

compiler/rustc_codegen_ssa/src/target_features.rs

@@ -342,6 +342,19 @@ const CSKY_ALLOWED_FEATURES: &[(&str, Option<Symbol>)] = &[
     ("hard-float-abi", Some(sym::csky_target_feature)),
     // tidy-alphabetical-end
 ];
+
+const LOONGARCH_ALLOWED_FEATURES: &[(&str, Option<Symbol>)] = &[
+    // tidy-alphabetical-start
+    ("d", Some(sym::loongarch_target_feature)),
+    ("f", Some(sym::loongarch_target_feature)),
+    ("lasx", Some(sym::loongarch_target_feature)),
+    ("lbt", Some(sym::loongarch_target_feature)),
+    ("lsx", Some(sym::loongarch_target_feature)),
+    ("lvz", Some(sym::loongarch_target_feature)),
+    ("ual", Some(sym::loongarch_target_feature)),
+    // tidy-alphabetical-end
+];
+
 /// When rustdoc is running, provide a list of all known features so that all their respective
 /// primitives may be documented.
 ///
@@ -358,6 +371,7 @@ pub fn all_known_features() -> impl Iterator<Item = (&'static str, Option<Symbol
         .chain(WASM_ALLOWED_FEATURES.iter())
         .chain(BPF_ALLOWED_FEATURES.iter())
         .chain(CSKY_ALLOWED_FEATURES)
+        .chain(LOONGARCH_ALLOWED_FEATURES)
         .cloned()
 }
 
@@ -373,6 +387,7 @@ pub fn supported_target_features(sess: &Session) -> &'static [(&'static str, Opt
         "wasm32" | "wasm64" => WASM_ALLOWED_FEATURES,
         "bpf" => BPF_ALLOWED_FEATURES,
         "csky" => CSKY_ALLOWED_FEATURES,
+        "loongarch64" => LOONGARCH_ALLOWED_FEATURES,
         _ => &[],
     }
 }
@@ -445,6 +460,7 @@ pub fn from_target_feature(
                 Some(sym::bpf_target_feature) => rust_features.bpf_target_feature,
                 Some(sym::aarch64_ver_target_feature) => rust_features.aarch64_ver_target_feature,
                 Some(sym::csky_target_feature) => rust_features.csky_target_feature,
+                Some(sym::loongarch_target_feature) => rust_features.loongarch_target_feature,
                 Some(name) => bug!("unknown target feature gate {}", name),
                 None => true,
             };

compiler/rustc_feature/src/unstable.rs

@@ -288,6 +288,7 @@ declare_features! (
     (unstable, csky_target_feature, "1.73.0", Some(44839), None),
     (unstable, ermsb_target_feature, "1.49.0", Some(44839), None),
     (unstable, hexagon_target_feature, "1.27.0", Some(44839), None),
+    (unstable, loongarch_target_feature, "1.73.0", Some(44839), None),
     (unstable, mips_target_feature, "1.27.0", Some(44839), None),
     (unstable, powerpc_target_feature, "1.27.0", Some(44839), None),
     (unstable, riscv_target_feature, "1.45.0", Some(44839), None),

compiler/rustc_span/src/symbol.rs

@@ -957,6 +957,7 @@ symbols! {
         log_syntax,
         logf32,
         logf64,
+        loongarch_target_feature,
         loop_break_value,
         lt,
         macro_at_most_once_rep,

tests/ui/abi/compatibility.rs

@@ -30,6 +30,7 @@
 // revisions: loongarch64
 //[loongarch64] compile-flags: --target loongarch64-unknown-linux-gnu
 //[loongarch64] needs-llvm-components: loongarch
+//[loongarch64] min-llvm-version: 17
 // revisions: wasm
 //[wasm] compile-flags: --target wasm32-unknown-unknown
 //[wasm] needs-llvm-components: webassembly

tests/ui/target-feature/gate.rs

@@ -18,6 +18,7 @@
 // gate-test-bpf_target_feature
 // gate-test-aarch64_ver_target_feature
 // gate-test-csky_target_feature
+// gate-test-loongarch_target_feature
 
 #[target_feature(enable = "avx512bw")]
 //~^ ERROR: currently unstable

tests/ui/target-feature/gate.stderr

@@ -1,5 +1,5 @@
 error[E0658]: the target feature `avx512bw` is currently unstable
-  --> $DIR/gate.rs:22:18
+  --> $DIR/gate.rs:23:18
    |
 LL | #[target_feature(enable = "avx512bw")]
    |                  ^^^^^^^^^^^^^^^^^^^