Remove lto inline logic

compiler/rustc_codegen_llvm/src/attributes.rs

@@ -28,22 +28,6 @@ pub(crate) fn apply_to_callsite(callsite: &Value, idx: AttributePlace, attrs: &[
     }
 }
 
-pub(crate) fn has_attr(llfn: &Value, idx: AttributePlace, attr: AttributeKind) -> bool {
-    llvm::HasAttributeAtIndex(llfn, idx, attr)
-}
-
-pub(crate) fn has_string_attr(llfn: &Value, name: &str) -> bool {
-    llvm::HasStringAttribute(llfn, name)
-}
-
-pub(crate) fn remove_from_llfn(llfn: &Value, place: AttributePlace, kind: AttributeKind) {
-    llvm::RemoveRustEnumAttributeAtIndex(llfn, place, kind);
-}
-
-pub(crate) fn remove_string_attr_from_llfn(llfn: &Value, name: &str) {
-    llvm::RemoveStringAttrFromFn(llfn, name);
-}
-
 /// Get LLVM attribute for the provided inline heuristic.
 #[inline]
 fn inline_attr<'ll>(cx: &CodegenCx<'ll, '_>, inline: InlineAttr) -> Option<&'ll Attribute> {

compiler/rustc_codegen_llvm/src/back/lto.rs

@@ -24,9 +24,8 @@ use crate::back::write::{
     self, CodegenDiagnosticsStage, DiagnosticHandlers, bitcode_section_name, save_temp_bitcode,
 };
 use crate::errors::{LlvmError, LtoBitcodeFromRlib};
-use crate::llvm::AttributePlace::Function;
 use crate::llvm::{self, build_string};
-use crate::{LlvmCodegenBackend, ModuleLlvm, SimpleCx, attributes};
+use crate::{LlvmCodegenBackend, ModuleLlvm, SimpleCx};
 
 /// We keep track of the computed LTO cache keys from the previous
 /// session to determine which CGUs we can reuse.
@@ -593,31 +592,6 @@ pub(crate) fn run_pass_manager(
     }
 
     if cfg!(llvm_enzyme) && enable_ad && !thin {
-        let cx =
-            SimpleCx::new(module.module_llvm.llmod(), &module.module_llvm.llcx, cgcx.pointer_size);
-
-        for function in cx.get_functions() {
-            let enzyme_marker = "enzyme_marker";
-            if attributes::has_string_attr(function, enzyme_marker) {
-                // Sanity check: Ensure 'noinline' is present before replacing it.
-                assert!(
-                    attributes::has_attr(function, Function, llvm::AttributeKind::NoInline),
-                    "Expected __enzyme function to have 'noinline' before adding 'alwaysinline'"
-                );
-
-                attributes::remove_from_llfn(function, Function, llvm::AttributeKind::NoInline);
-                attributes::remove_string_attr_from_llfn(function, enzyme_marker);
-
-                assert!(
-                    !attributes::has_string_attr(function, enzyme_marker),
-                    "Expected function to not have 'enzyme_marker'"
-                );
-
-                let always_inline = llvm::AttributeKind::AlwaysInline.create_attr(cx.llcx);
-                attributes::apply_to_llfn(function, Function, &[always_inline]);
-            }
-        }
-
         let opt_stage = llvm::OptStage::FatLTO;
         let stage = write::AutodiffStage::PostAD;
         if !config.autodiff.contains(&config::AutoDiff::NoPostopt) {

compiler/rustc_codegen_llvm/src/context.rs

@@ -722,16 +722,6 @@ impl<'ll, CX: Borrow<SCx<'ll>>> GenericCx<'ll, CX> {
             llvm::LLVMMDStringInContext2(self.llcx(), name.as_ptr() as *const c_char, name.len())
         }
     }
-
-    pub(crate) fn get_functions(&self) -> Vec<&'ll Value> {
-        let mut functions = vec![];
-        let mut func = unsafe { llvm::LLVMGetFirstFunction(self.llmod()) };
-        while let Some(f) = func {
-            functions.push(f);
-            func = unsafe { llvm::LLVMGetNextFunction(f) }
-        }
-        functions
-    }
 }
 
 impl<'ll, 'tcx> MiscCodegenMethods<'tcx> for CodegenCx<'ll, 'tcx> {

compiler/rustc_codegen_llvm/src/llvm/mod.rs

@@ -42,32 +42,6 @@ pub(crate) fn AddFunctionAttributes<'ll>(
     }
 }
 
-pub(crate) fn HasAttributeAtIndex<'ll>(
-    llfn: &'ll Value,
-    idx: AttributePlace,
-    kind: AttributeKind,
-) -> bool {
-    unsafe { LLVMRustHasAttributeAtIndex(llfn, idx.as_uint(), kind) }
-}
-
-pub(crate) fn HasStringAttribute<'ll>(llfn: &'ll Value, name: &str) -> bool {
-    unsafe { LLVMRustHasFnAttribute(llfn, name.as_c_char_ptr(), name.len()) }
-}
-
-pub(crate) fn RemoveStringAttrFromFn<'ll>(llfn: &'ll Value, name: &str) {
-    unsafe { LLVMRustRemoveFnAttribute(llfn, name.as_c_char_ptr(), name.len()) }
-}
-
-pub(crate) fn RemoveRustEnumAttributeAtIndex(
-    llfn: &Value,
-    place: AttributePlace,
-    kind: AttributeKind,
-) {
-    unsafe {
-        LLVMRustRemoveEnumAttributeAtIndex(llfn, place.as_uint(), kind);
-    }
-}
-
 pub(crate) fn AddCallSiteAttributes<'ll>(
     callsite: &'ll Value,
     idx: AttributePlace,