Add avr_target_feature

compiler/rustc_feature/src/unstable.rs

@@ -373,6 +373,8 @@ declare_features! (
     (unstable, async_for_loop, "1.77.0", Some(118898)),
     /// Allows `async` trait bound modifier.
     (unstable, async_trait_bounds, "1.85.0", Some(62290)),
+    /// Target features on avr.
+    (unstable, avr_target_feature, "CURRENT_RUSTC_VERSION", Some(146889)),
     /// Allows using Intel AVX10 target features and intrinsics
     (unstable, avx10_target_feature, "1.88.0", Some(138843)),
     /// Target features on bpf.

compiler/rustc_span/src/symbol.rs

@@ -577,6 +577,7 @@ symbols! {
         automatically_derived,
         available_externally,
         avr,
+        avr_target_feature,
         avx,
         avx10_target_feature,
         avx512_target_feature,

compiler/rustc_target/src/target_features.rs

@@ -898,6 +898,28 @@ static M68K_FEATURES: &[(&str, Stability, ImpliedFeatures)] = &[
     // tidy-alphabetical-end
 ];
 
+static AVR_FEATURES: &[(&str, Stability, ImpliedFeatures)] = &[
+    // tidy-alphabetical-start
+    ("addsubiw", Unstable(sym::avr_target_feature), &[]),
+    ("break", Unstable(sym::avr_target_feature), &[]),
+    ("eijmpcall", Unstable(sym::avr_target_feature), &[]),
+    ("elpm", Unstable(sym::avr_target_feature), &[]),
+    ("elpmx", Unstable(sym::avr_target_feature), &[]),
+    ("ijmpcall", Unstable(sym::avr_target_feature), &[]),
+    ("jmpcall", Unstable(sym::avr_target_feature), &[]),
+    ("lowbytefirst", Unstable(sym::avr_target_feature), &[]),
+    ("lpm", Unstable(sym::avr_target_feature), &[]),
+    ("lpmx", Unstable(sym::avr_target_feature), &[]),
+    ("movw", Unstable(sym::avr_target_feature), &[]),
+    ("mul", Unstable(sym::avr_target_feature), &[]),
+    ("rmw", Unstable(sym::avr_target_feature), &[]),
+    ("spm", Unstable(sym::avr_target_feature), &[]),
+    ("spmx", Unstable(sym::avr_target_feature), &[]),
+    ("sram", Unstable(sym::avr_target_feature), &[]),
+    ("tinyencoding", Unstable(sym::avr_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.
 ///
@@ -919,6 +941,7 @@ pub fn all_rust_features() -> impl Iterator<Item = (&'static str, Stability)> {
         .chain(IBMZ_FEATURES)
         .chain(SPARC_FEATURES)
         .chain(M68K_FEATURES)
+        .chain(AVR_FEATURES)
         .cloned()
         .map(|(f, s, _)| (f, s))
 }
@@ -996,8 +1019,8 @@ impl Target {
             Arch::S390x => IBMZ_FEATURES,
             Arch::Sparc | Arch::Sparc64 => SPARC_FEATURES,
             Arch::M68k => M68K_FEATURES,
+            Arch::Avr => AVR_FEATURES,
             Arch::AmdGpu
-            | Arch::Avr
             | Arch::Msp430
             | Arch::SpirV
             | Arch::Xtensa
@@ -1023,11 +1046,11 @@ impl Target {
                 MIPS_FEATURES_FOR_CORRECT_FIXED_LENGTH_VECTOR_ABI
             }
             Arch::AmdGpu => AMDGPU_FEATURES_FOR_CORRECT_FIXED_LENGTH_VECTOR_ABI,
-            Arch::Nvptx64 | Arch::Bpf | Arch::M68k => &[], // no vector ABI
+            Arch::Nvptx64 | Arch::Bpf | Arch::M68k | Arch::Avr => &[], // no vector ABI
             Arch::CSky => CSKY_FEATURES_FOR_CORRECT_FIXED_LENGTH_VECTOR_ABI,
             // FIXME: for some tier3 targets, we are overly cautious and always give warnings
             // when passing args in vector registers.
-            Arch::Avr | Arch::Msp430 | Arch::SpirV | Arch::Xtensa | Arch::Other(_) => &[],
+            Arch::Msp430 | Arch::SpirV | Arch::Xtensa | Arch::Other(_) => &[],
         }
     }
 

tests/ui/check-cfg/target_feature.stderr

@@ -14,6 +14,7 @@ LL |     cfg!(target_feature = "_UNEXPECTED_VALUE");
 `7e10`
 `a`
 `aclass`
+`addsubiw`
 `adx`
 `aes`
 `altivec`
@@ -57,6 +58,7 @@ LL |     cfg!(target_feature = "_UNEXPECTED_VALUE");
 `bf16`
 `bmi1`
 `bmi2`
+`break`
 `bti`
 `bulk-memory`
 `c`
@@ -83,6 +85,9 @@ LL |     cfg!(target_feature = "_UNEXPECTED_VALUE");
 `e2`
 `ecv`
 `edsp`
+`eijmpcall`
+`elpm`
+`elpmx`
 `elrw`
 `enhanced-sort`
 `ermsb`
@@ -148,6 +153,7 @@ LL |     cfg!(target_feature = "_UNEXPECTED_VALUE");
 `hvxv79`
 `hwdiv`
 `i8mm`
+`ijmpcall`
 `isa-68000`
 `isa-68010`
 `isa-68020`
@@ -156,6 +162,7 @@ LL |     cfg!(target_feature = "_UNEXPECTED_VALUE");
 `isa-68060`
 `isa-68881`
 `isa-68882`
+`jmpcall`
 `jsconv`
 `kl`
 `lahfsahf`
@@ -166,6 +173,9 @@ LL |     cfg!(target_feature = "_UNEXPECTED_VALUE");
 `ld-seq-sa`
 `leoncasa`
 `lor`
+`lowbytefirst`
+`lpm`
+`lpmx`
 `lse`
 `lse128`
 `lse2`
@@ -187,11 +197,13 @@ LL |     cfg!(target_feature = "_UNEXPECTED_VALUE");
 `mops`
 `movbe`
 `movrs`
+`movw`
 `mp`
 `mp1e2`
 `msa`
 `msync`
 `mte`
+`mul`
 `multivalue`
 `mutable-globals`
 `neon`
@@ -256,6 +268,7 @@ LL |     cfg!(target_feature = "_UNEXPECTED_VALUE");
 `reference-types`
 `relax`
 `relaxed-simd`
+`rmw`
 `rtm`
 `rva23u64`
 `sb`
@@ -308,6 +321,9 @@ LL |     cfg!(target_feature = "_UNEXPECTED_VALUE");
 `sme2p1`
 `soft-float`
 `spe`
+`spm`
+`spmx`
+`sram`
 `ssbs`
 `sse`
 `sse2`
@@ -332,6 +348,7 @@ LL |     cfg!(target_feature = "_UNEXPECTED_VALUE");
 `tbm`
 `thumb-mode`
 `thumb2`
+`tinyencoding`
 `tme`
 `transactional-execution`
 `trust`

tests/ui/target-feature/gate.rs

@@ -20,6 +20,7 @@
 // gate-test-sparc_target_feature
 // gate-test-x87_target_feature
 // gate-test-m68k_target_feature
+// gate-test-avr_target_feature
 
 #[target_feature(enable = "x87")]
 //~^ ERROR: currently unstable

tests/ui/target-feature/gate.stderr

@@ -1,5 +1,5 @@
 error[E0658]: the target feature `x87` is currently unstable
-  --> $DIR/gate.rs:24:18
+  --> $DIR/gate.rs:25:18
    |
 LL | #[target_feature(enable = "x87")]
    |                  ^^^^^^^^^^^^^^