Remove dead code

Author: Sa4dUs

compiler/rustc_codegen_llvm/src/context.rs

@@ -8,7 +8,6 @@ use std::str;
 use rustc_abi::{HasDataLayout, Size, TargetDataLayout, VariantIdx};
 use rustc_codegen_ssa::back::versioned_llvm_target;
 use rustc_codegen_ssa::base::{wants_msvc_seh, wants_wasm_eh};
-use rustc_codegen_ssa::common::TypeKind;
 use rustc_codegen_ssa::errors as ssa_errors;
 use rustc_codegen_ssa::traits::*;
 use rustc_data_structures::base_n::{ALPHANUMERIC_ONLY, ToBaseN};
@@ -654,10 +653,6 @@ impl<'ll, 'tcx> CodegenCx<'ll, 'tcx> {
     }
 }
 impl<'ll> SimpleCx<'ll> {
-    pub(crate) fn _get_return_type(&self, ty: &'ll Type) -> &'ll Type {
-        assert_eq!(self.type_kind(ty), TypeKind::Function);
-        unsafe { llvm::LLVMGetReturnType(ty) }
-    }
     pub(crate) fn get_type_of_global(&self, val: &'ll Value) -> &'ll Type {
         unsafe { llvm::LLVMGlobalGetValueType(val) }
     }

compiler/rustc_codegen_ssa/src/codegen_attrs.rs

@@ -68,13 +68,6 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, did: LocalDefId) -> CodegenFnAttrs {
         codegen_fn_attrs.flags |= CodegenFnAttrFlags::TRACK_CALLER;
     }
 
-    // If our rustc version supports autodiff/enzyme, then we call our handler
-    // to check for any `#[rustc_autodiff(...)]` attributes.
-    if cfg!(llvm_enzyme) {
-        let ad = autodiff_attrs(tcx, did.into());
-        codegen_fn_attrs.autodiff_item = ad;
-    }
-
     // When `no_builtins` is applied at the crate level, we should add the
     // `no-builtins` attribute to each function to ensure it takes effect in LTO.
     let crate_attrs = tcx.hir_attrs(rustc_hir::CRATE_HIR_ID);

compiler/rustc_middle/src/middle/codegen_fn_attrs.rs

@@ -1,7 +1,6 @@
 use std::borrow::Cow;
 
 use rustc_abi::Align;
-use rustc_ast::expand::autodiff_attrs::AutoDiffAttrs;
 use rustc_attr_data_structures::{InlineAttr, InstructionSetAttr, OptimizeAttr};
 use rustc_macros::{HashStable, TyDecodable, TyEncodable};
 use rustc_span::Symbol;
@@ -75,8 +74,6 @@ pub struct CodegenFnAttrs {
     /// The `#[patchable_function_entry(...)]` attribute. Indicates how many nops should be around
     /// the function entry.
     pub patchable_function_entry: Option<PatchableFunctionEntry>,
-    /// For the `#[autodiff]` macros.
-    pub autodiff_item: Option<AutoDiffAttrs>,
 }
 
 #[derive(Copy, Clone, Debug, TyEncodable, TyDecodable, HashStable)]
@@ -182,7 +179,6 @@ impl CodegenFnAttrs {
             instruction_set: None,
             alignment: None,
             patchable_function_entry: None,
-            autodiff_item: None,
         }
     }