ABI checks: add support for tier2 arches

See #131800 for the data collection behind this change.

compiler/rustc_target/src/target_features.rs

@@ -582,6 +582,14 @@ pub fn all_rust_features() -> impl Iterator<Item = (&'static str, Stability)> {
 const X86_FEATURES_FOR_CORRECT_VECTOR_ABI: &'static [(u64, &'static str)] =
     &[(128, "sse"), (256, "avx"), (512, "avx512f")];
 const AARCH64_FEATURES_FOR_CORRECT_VECTOR_ABI: &'static [(u64, &'static str)] = &[(128, "neon")];
+const ARM_FEATURES_FOR_CORRECT_VECTOR_ABI: &'static [(u64, &'static str)] = &[(128, "neon")];
+const POWERPC_FEATURES_FOR_CORRECT_VECTOR_ABI: &'static [(u64, &'static str)] = &[(128, "altivec")];
+const WASM_FEATURES_FOR_CORRECT_VECTOR_ABI: &'static [(u64, &'static str)] = &[(128, "simd128")];
+const S390X_FEATURES_FOR_CORRECT_VECTOR_ABI: &'static [(u64, &'static str)] = &[(128, "vector")];
+// Always warn on RISCV and SPARC, as the necessary target features cannot be enabled in Rust at
+// the moment.
+const RISCV_FEATURES_FOR_CORRECT_VECTOR_ABI: &'static [(u64, &'static str)] = &[];
+const SPARC_FEATURES_FOR_CORRECT_VECTOR_ABI: &'static [(u64, &'static str)] = &[];
 
 impl super::spec::Target {
     pub fn rust_target_features(&self) -> &'static [(&'static str, Stability, ImpliedFeatures)] {
@@ -606,9 +614,19 @@ impl super::spec::Target {
     // Returns None if we do not support ABI checks on the given target yet.
     pub fn features_for_correct_vector_abi(&self) -> Option<&'static [(u64, &'static str)]> {
         match &*self.arch {
+            // Tier 1
             "x86" | "x86_64" => Some(X86_FEATURES_FOR_CORRECT_VECTOR_ABI),
             "aarch64" => Some(AARCH64_FEATURES_FOR_CORRECT_VECTOR_ABI),
-            // FIXME: add support for non-tier1 architectures
+            // Tier 2
+            "arm64ec" => Some(AARCH64_FEATURES_FOR_CORRECT_VECTOR_ABI),
+            "arm" => Some(ARM_FEATURES_FOR_CORRECT_VECTOR_ABI),
+            "powerpc" | "powerpc64" => Some(POWERPC_FEATURES_FOR_CORRECT_VECTOR_ABI),
+            "loongarch64" => Some(&[]), // on-stack ABI, so we complain about all by-val vectors
+            "riscv32" | "riscv64" => Some(RISCV_FEATURES_FOR_CORRECT_VECTOR_ABI),
+            "wasm32" | "wasm64" => Some(WASM_FEATURES_FOR_CORRECT_VECTOR_ABI),
+            "s390x" => Some(S390X_FEATURES_FOR_CORRECT_VECTOR_ABI),
+            "sparc" | "sparc64" => Some(SPARC_FEATURES_FOR_CORRECT_VECTOR_ABI),
+            // FIXME: add support for non-tier2 architectures
             _ => None,
         }
     }