upstream rustc_codegen_llvm changes for enzyme/autodiff

compiler/rustc_codegen_llvm/src/back/lto.rs

@@ -604,7 +604,14 @@ pub(crate) fn run_pass_manager(
     debug!("running the pass manager");
     let opt_stage = if thin { llvm::OptStage::ThinLTO } else { llvm::OptStage::FatLTO };
     let opt_level = config.opt_level.unwrap_or(config::OptLevel::No);
-    unsafe { write::llvm_optimize(cgcx, dcx, module, config, opt_level, opt_stage) }?;
+
+    // If this rustc version was build with enzyme/autodiff enabled, and if users applied the
+    // `#[autodiff]` macro at least once, then we will later call llvm_optimize a second time.
+    let first_run = true;
+    debug!("running llvm pm opt pipeline");
+    unsafe {
+        write::llvm_optimize(cgcx, dcx, module, config, opt_level, opt_stage, first_run)?;
+    }
     debug!("lto done");
     Ok(())
 }

compiler/rustc_codegen_llvm/src/back/write.rs

@@ -27,7 +27,7 @@ use rustc_session::config::{
 };
 use rustc_span::{BytePos, InnerSpan, Pos, SpanData, SyntaxContext, sym};
 use rustc_target::spec::{CodeModel, FloatAbi, RelocModel, SanitizerSet, SplitDebuginfo, TlsModel};
-use tracing::debug;
+use tracing::{debug, trace};
 
 use crate::back::lto::ThinBuffer;
 use crate::back::owned_target_machine::OwnedTargetMachine;
@@ -537,9 +537,35 @@ pub(crate) unsafe fn llvm_optimize(
     config: &ModuleConfig,
     opt_level: config::OptLevel,
     opt_stage: llvm::OptStage,
+    skip_size_increasing_opts: bool,
 ) -> Result<(), FatalError> {
-    let unroll_loops =
-        opt_level != config::OptLevel::Size && opt_level != config::OptLevel::SizeMin;
+    // Enzyme:
+    // The whole point of compiler based AD is to differentiate optimized IR instead of unoptimized
+    // source code. However, benchmarks show that optimizations increasing the code size
+    // tend to reduce AD performance. Therefore deactivate them before AD, then differentiate the code
+    // and finally re-optimize the module, now with all optimizations available.
+    // FIXME(ZuseZ4): In a future update we could figure out how to only optimize individual functions getting
+    // differentiated.
+
+    let unroll_loops;
+    let vectorize_slp;
+    let vectorize_loop;
+
+    // When we build rustc with enzyme/autodiff support, we want to postpone size-increasing
+    // optimizations until after differentiation. FIXME(ZuseZ4): Before shipping on nightly,
+    // we should make this more granular, or at least check that the user has at least one autodiff
+    // call in their code, to justify altering the compilation pipeline.
+    if skip_size_increasing_opts && cfg!(llvm_enzyme) {
+        unroll_loops = false;
+        vectorize_slp = false;
+        vectorize_loop = false;
+    } else {
+        unroll_loops =
+            opt_level != config::OptLevel::Size && opt_level != config::OptLevel::SizeMin;
+        vectorize_slp = config.vectorize_slp;
+        vectorize_loop = config.vectorize_loop;
+    }
+    trace!(?unroll_loops, ?vectorize_slp, ?vectorize_loop);
     let using_thin_buffers = opt_stage == llvm::OptStage::PreLinkThinLTO || config.bitcode_needed();
     let pgo_gen_path = get_pgo_gen_path(config);
     let pgo_use_path = get_pgo_use_path(config);
@@ -603,8 +629,8 @@ pub(crate) unsafe fn llvm_optimize(
             using_thin_buffers,
             config.merge_functions,
             unroll_loops,
-            config.vectorize_slp,
-            config.vectorize_loop,
+            vectorize_slp,
+            vectorize_loop,
             config.no_builtins,
             config.emit_lifetime_markers,
             sanitizer_options.as_ref(),
@@ -648,6 +674,8 @@ pub(crate) unsafe fn optimize(
         unsafe { llvm::LLVMWriteBitcodeToFile(llmod, out.as_ptr()) };
     }
 
+    // FIXME(ZuseZ4): support SanitizeHWAddress and prevent illegal/unsupported opts
+
     if let Some(opt_level) = config.opt_level {
         let opt_stage = match cgcx.lto {
             Lto::Fat => llvm::OptStage::PreLinkFatLTO,
@@ -655,7 +683,20 @@ pub(crate) unsafe fn optimize(
             _ if cgcx.opts.cg.linker_plugin_lto.enabled() => llvm::OptStage::PreLinkThinLTO,
             _ => llvm::OptStage::PreLinkNoLTO,
         };
-        return unsafe { llvm_optimize(cgcx, dcx, module, config, opt_level, opt_stage) };
+
+        // If we know that we will later run AD, then we disable vectorization and loop unrolling
+        let skip_size_increasing_opts = cfg!(llvm_enzyme);
+        return unsafe {
+            llvm_optimize(
+                cgcx,
+                dcx,
+                module,
+                config,
+                opt_level,
+                opt_stage,
+                skip_size_increasing_opts,
+            )
+        };
     }
     Ok(())
 }

compiler/rustc_codegen_llvm/src/builder.rs

@@ -2,6 +2,8 @@ use std::borrow::Cow;
 use std::ops::Deref;
 use std::{iter, ptr};
 
+pub(crate) mod autodiff;
+
 use libc::{c_char, c_uint};
 use rustc_abi as abi;
 use rustc_abi::{Align, Size, WrappingRange};

compiler/rustc_codegen_llvm/src/builder/autodiff.rs

@@ -0,0 +1,344 @@
+use std::ptr;
+
+use rustc_ast::expand::autodiff_attrs::{AutoDiffAttrs, AutoDiffItem, DiffActivity, DiffMode};
+use rustc_codegen_ssa::ModuleCodegen;
+use rustc_codegen_ssa::back::write::ModuleConfig;
+use rustc_codegen_ssa::traits::{BaseTypeCodegenMethods, BuilderMethods};
+use rustc_errors::FatalError;
+use rustc_middle::ty::TyCtxt;
+use rustc_session::config::Lto;
+use tracing::{debug, trace};
+
+use crate::back::write::{llvm_err, llvm_optimize};
+use crate::builder::Builder;
+use crate::declare::declare_raw_fn;
+use crate::errors::LlvmError;
+use crate::llvm::AttributePlace::Function;
+use crate::llvm::{Metadata, True};
+use crate::value::Value;
+use crate::{CodegenContext, LlvmCodegenBackend, ModuleLlvm, attributes, context, llvm};
+
+fn get_params(fnc: &Value) -> Vec<&Value> {
+    unsafe {
+        let param_num = llvm::LLVMCountParams(fnc) as usize;
+        let mut fnc_args: Vec<&Value> = vec![];
+        fnc_args.reserve(param_num);
+        llvm::LLVMGetParams(fnc, fnc_args.as_mut_ptr());
+        fnc_args.set_len(param_num);
+        fnc_args
+    }
+}
+
+/// When differentiating `fn_to_diff`, take a `outer_fn` and generate another
+/// function with expected naming and calling conventions[^1] which will be
+/// discovered by the enzyme LLVM pass and its body populated with the differentiated
+/// `fn_to_diff`. `outer_fn` is then modified to have a call to the generated
+/// function and handle the differences between the Rust calling convention and
+/// Enzyme.
+/// [^1]: <https://enzyme.mit.edu/getting_started/CallingConvention/>
+// FIXME(ZuseZ4): `outer_fn` should include upstream safety checks to
+// cover some assumptions of enzyme/autodiff, which could lead to UB otherwise.
+fn generate_enzyme_call<'ll, 'tcx>(
+    cx: &context::CodegenCx<'ll, 'tcx>,
+    fn_to_diff: &'ll Value,
+    outer_fn: &'ll Value,
+    attrs: AutoDiffAttrs,
+) {
+    let inputs = attrs.input_activity;
+    let output = attrs.ret_activity;
+
+    // We have to pick the name depending on whether we want forward or reverse mode autodiff.
+    // FIXME(ZuseZ4): The new pass based approach should not need the {Forward/Reverse}First method anymore, since
+    // it will handle higher-order derivatives correctly automatically (in theory). Currently
+    // higher-order derivatives fail, so we should debug that before adjusting this code.
+    let mut ad_name: String = match attrs.mode {
+        DiffMode::Forward => "__enzyme_fwddiff",
+        DiffMode::Reverse => "__enzyme_autodiff",
+        DiffMode::ForwardFirst => "__enzyme_fwddiff",
+        DiffMode::ReverseFirst => "__enzyme_autodiff",
+        _ => panic!("logic bug in autodiff, unrecognized mode"),
+    }
+    .to_string();
+
+    // add outer_fn name to ad_name to make it unique, in case users apply autodiff to multiple
+    // functions. Unwrap will only panic, if LLVM gave us an invalid string.
+    let name = llvm::get_value_name(outer_fn);
+    let outer_fn_name = std::ffi::CStr::from_bytes_with_nul(name).unwrap().to_str().unwrap();
+    ad_name.push_str(outer_fn_name.to_string().as_str());
+
+    // Let us assume the user wrote the following function square:
+    //
+    // ```llvm
+    // define double @square(double %x) {
+    // entry:
+    //  %0 = fmul double %x, %x
+    //  ret double %0
+    // }
+    // ```
+    //
+    // The user now applies autodiff to the function square, in which case fn_to_diff will be `square`.
+    // Our macro generates the following placeholder code (slightly simplified):
+    //
+    // ```llvm
+    // define double @dsquare(double %x) {
+    //  ; placeholder code
+    //  return 0.0;
+    // }
+    // ```
+    //
+    // so our `outer_fn` will be `dsquare`. The unsafe code section below now removes the placeholder
+    // code and inserts an autodiff call. We also add a declaration for the __enzyme_autodiff call.
+    // Again, the arguments to all functions are slightly simplified.
+    // ```llvm
+    // declare double @__enzyme_autodiff_square(...)
+    //
+    // define double @dsquare(double %x) {
+    // entry:
+    //   %0 = tail call double (...) @__enzyme_autodiff_square(double (double)* nonnull @square, double %x)
+    //   ret double %0
+    // }
+    // ```
+    unsafe {
+        // On LLVM-IR, we can luckily declare __enzyme_ functions without specifying the input
+        // arguments. We do however need to declare them with their correct return type.
+        // We already figured the correct return type out in our frontend, when generating the outer_fn,
+        // so we can now just go ahead and use that. FIXME(ZuseZ4): This doesn't handle sret yet.
+        let fn_ty = llvm::LLVMGlobalGetValueType(outer_fn);
+        let ret_ty = llvm::LLVMGetReturnType(fn_ty);
+
+        // LLVM can figure out the input types on it's own, so we take a shortcut here.
+        let enzyme_ty = llvm::LLVMFunctionType(ret_ty, ptr::null(), 0, True);
+
+        //FIXME(ZuseZ4): the CC/Addr/Vis values are best effort guesses, we should look at tests and
+        // think a bit more about what should go here.
+        let cc = llvm::LLVMGetFunctionCallConv(outer_fn);
+        let ad_fn = declare_raw_fn(
+            cx,
+            &ad_name,
+            llvm::CallConv::try_from(cc).expect("invalid callconv"),
+            llvm::UnnamedAddr::No,
+            llvm::Visibility::Default,
+            enzyme_ty,
+        );
+
+        // Otherwise LLVM might inline our temporary code before the enzyme pass has a chance to
+        // do it's work.
+        let attr = llvm::AttributeKind::NoInline.create_attr(cx.llcx);
+        attributes::apply_to_llfn(ad_fn, Function, &[attr]);
+
+        // first, remove all calls from fnc
+        let entry = llvm::LLVMGetFirstBasicBlock(outer_fn);
+        let br = llvm::LLVMRustGetTerminator(entry);
+        llvm::LLVMRustEraseInstFromParent(br);
+
+        let last_inst = llvm::LLVMRustGetLastInstruction(entry).unwrap();
+        let mut builder = Builder::build(cx, entry);
+
+        let num_args = llvm::LLVMCountParams(&fn_to_diff);
+        let mut args = Vec::with_capacity(num_args as usize + 1);
+        args.push(fn_to_diff);
+
+        let enzyme_const = cx.create_metadata("enzyme_const".to_string()).unwrap();
+        let enzyme_out = cx.create_metadata("enzyme_out".to_string()).unwrap();
+        let enzyme_dup = cx.create_metadata("enzyme_dup".to_string()).unwrap();
+        let enzyme_dupnoneed = cx.create_metadata("enzyme_dupnoneed".to_string()).unwrap();
+        let enzyme_primal_ret = cx.create_metadata("enzyme_primal_return".to_string()).unwrap();
+
+        match output {
+            DiffActivity::Dual => {
+                args.push(cx.get_metadata_value(enzyme_primal_ret));
+            }
+            DiffActivity::Active => {
+                args.push(cx.get_metadata_value(enzyme_primal_ret));
+            }
+            _ => {}
+        }
+
+        trace!("matching autodiff arguments");
+        // We now handle the issue that Rust level arguments not always match the llvm-ir level
+        // arguments. A slice, `&[f32]`, for example, is represented as a pointer and a length on
+        // llvm-ir level. The number of activities matches the number of Rust level arguments, so we
+        // need to match those.
+        // FIXME(ZuseZ4): This logic is a bit more complicated than it should be, can we simplify it
+        // using iterators and peek()?
+        let mut outer_pos: usize = 0;
+        let mut activity_pos = 0;
+        let outer_args: Vec<&llvm::Value> = get_params(outer_fn);
+        while activity_pos < inputs.len() {
+            let activity = inputs[activity_pos as usize];
+            // Duplicated arguments received a shadow argument, into which enzyme will write the
+            // gradient.
+            let (activity, duplicated): (&Metadata, bool) = match activity {
+                DiffActivity::None => panic!("not a valid input activity"),
+                DiffActivity::Const => (enzyme_const, false),
+                DiffActivity::Active => (enzyme_out, false),
+                DiffActivity::ActiveOnly => (enzyme_out, false),
+                DiffActivity::Dual => (enzyme_dup, true),
+                DiffActivity::DualOnly => (enzyme_dupnoneed, true),
+                DiffActivity::Duplicated => (enzyme_dup, true),
+                DiffActivity::DuplicatedOnly => (enzyme_dupnoneed, true),
+                DiffActivity::FakeActivitySize => (enzyme_const, false),
+            };
+            let outer_arg = outer_args[outer_pos];
+            args.push(cx.get_metadata_value(activity));
+            args.push(outer_arg);
+            if duplicated {
+                // We know that duplicated args by construction have a following argument,
+                // so this can not be out of bounds.
+                let next_outer_arg = outer_args[outer_pos + 1];
+                let next_outer_ty = cx.val_ty(next_outer_arg);
+                // FIXME(ZuseZ4): We should add support for Vec here too, but it's less urgent since
+                // vectors behind references (&Vec<T>) are already supported. Users can not pass a
+                // Vec by value for reverse mode, so this would only help forward mode autodiff.
+                let slice = {
+                    if activity_pos + 1 >= inputs.len() {
+                        // If there is no arg following our ptr, it also can't be a slice,
+                        // since that would lead to a ptr, int pair.
+                        false
+                    } else {
+                        let next_activity = inputs[activity_pos + 1];
+                        // We analyze the MIR types and add this dummy activity if we visit a slice.
+                        next_activity == DiffActivity::FakeActivitySize
+                    }
+                };
+                if slice {
+                    // A duplicated slice will have the following two outer_fn arguments:
+                    // (..., ptr1, int1, ptr2, int2, ...). We add the following llvm-ir to our __enzyme call:
+                    // (..., metadata! enzyme_dup, ptr, ptr, int1, ...).
+                    // FIXME(ZuseZ4): We will upstream a safety check later which asserts that
+                    // int2 >= int1, which means the shadow vector is large enough to store the gradient.
+                    assert!(llvm::LLVMRustGetTypeKind(next_outer_ty) == llvm::TypeKind::Integer);
+                    let next_outer_arg2 = outer_args[outer_pos + 2];
+                    let next_outer_ty2 = cx.val_ty(next_outer_arg2);
+                    assert!(llvm::LLVMRustGetTypeKind(next_outer_ty2) == llvm::TypeKind::Pointer);
+                    let next_outer_arg3 = outer_args[outer_pos + 3];
+                    let next_outer_ty3 = cx.val_ty(next_outer_arg3);
+                    assert!(llvm::LLVMRustGetTypeKind(next_outer_ty3) == llvm::TypeKind::Integer);
+                    args.push(next_outer_arg2);
+                    args.push(cx.get_metadata_value(enzyme_const));
+                    args.push(next_outer_arg);
+                    outer_pos += 4;
+                    activity_pos += 2;
+                } else {
+                    // A duplicated pointer will have the following two outer_fn arguments:
+                    // (..., ptr, ptr, ...). We add the following llvm-ir to our __enzyme call:
+                    // (..., metadata! enzyme_dup, ptr, ptr, ...).
+                    assert!(llvm::LLVMRustGetTypeKind(next_outer_ty) == llvm::TypeKind::Pointer);
+                    args.push(next_outer_arg);
+                    outer_pos += 2;
+                    activity_pos += 1;
+                }
+            } else {
+                // We do not differentiate with resprect to this argument.
+                // We already added the metadata and argument above, so just increase the counters.
+                outer_pos += 1;
+                activity_pos += 1;
+            }
+        }
+
+        let call = builder.call(enzyme_ty, None, None, ad_fn, &args, None, None);
+
+        // This part is a bit iffy. LLVM requires that a call to an inlineable function has some
+        // metadata attachted to it, but we just created this code oota. Given that the
+        // differentiated function already has partly confusing metadata, and given that this
+        // affects nothing but the auttodiff IR, we take a shortcut and just steal metadata from the
+        // dummy code which we inserted at a higher level.
+        // FIXME(ZuseZ4): Work with Enzyme core devs to clarify what debug metadata issues we have,
+        // and how to best improve it for enzyme core and rust-enzyme.
+        let md_ty = cx.get_md_kind_id("dbg");
+        if llvm::LLVMRustHasMetadata(last_inst, md_ty) {
+            let md = llvm::LLVMRustDIGetInstMetadata(last_inst)
+                .expect("failed to get instruction metadata");
+            let md_todiff = cx.get_metadata_value(md);
+            llvm::LLVMSetMetadata(call, md_ty, md_todiff);
+        } else {
+            // We don't panic, since depending on whether we are in debug or release mode, we might
+            // have no debug info to copy, which would then be ok.
+            trace!("no dbg info");
+        }
+        // Now that we copied the metadata, get rid of dummy code.
+        llvm::LLVMRustEraseInstBefore(entry, last_inst);
+        llvm::LLVMRustEraseInstFromParent(last_inst);
+
+        if cx.val_ty(outer_fn) != cx.type_void() {
+            builder.ret(call);
+        } else {
+            builder.ret_void();
+        }
+
+        // Let's crash in case that we messed something up above and generated invalid IR.
+        llvm::LLVMRustVerifyFunction(
+            outer_fn,
+            llvm::LLVMRustVerifierFailureAction::LLVMAbortProcessAction,
+        );
+    }
+}
+
+pub(crate) fn differentiate<'ll, 'tcx>(
+    module: &'ll ModuleCodegen<ModuleLlvm>,
+    cgcx: &CodegenContext<LlvmCodegenBackend>,
+    tcx: TyCtxt<'tcx>,
+    diff_items: Vec<AutoDiffItem>,
+    config: &ModuleConfig,
+) -> Result<(), FatalError> {
+    for item in &diff_items {
+        trace!("{}", item);
+    }
+
+    let diag_handler = cgcx.create_dcx();
+    let (_, cgus) = tcx.collect_and_partition_mono_items(());
+    let cx = context::CodegenCx::new(tcx, &cgus.first().unwrap(), &module.module_llvm);
+
+    // Before dumping the module, we want all the TypeTrees to become part of the module.
+    for item in diff_items.iter() {
+        let name = item.source.clone();
+        let fn_def: Option<&llvm::Value> = cx.get_function(&name);
+        let Some(fn_def) = fn_def else {
+            return Err(llvm_err(diag_handler.handle(), LlvmError::PrepareAutoDiff {
+                src: item.source.clone(),
+                target: item.target.clone(),
+                error: "could not find source function".to_owned(),
+            }));
+        };
+        debug!(?item.target);
+        let fn_target: Option<&llvm::Value> = cx.get_function(&item.target);
+        let Some(fn_target) = fn_target else {
+            return Err(llvm_err(diag_handler.handle(), LlvmError::PrepareAutoDiff {
+                src: item.source.clone(),
+                target: item.target.clone(),
+                error: "could not find target function".to_owned(),
+            }));
+        };
+
+        generate_enzyme_call(&cx, fn_def, fn_target, item.attrs.clone());
+    }
+
+    // FIXME(ZuseZ4): support SanitizeHWAddress and prevent illegal/unsupported opts
+
+    if let Some(opt_level) = config.opt_level {
+        let opt_stage = match cgcx.lto {
+            Lto::Fat => llvm::OptStage::PreLinkFatLTO,
+            Lto::Thin | Lto::ThinLocal => llvm::OptStage::PreLinkThinLTO,
+            _ if cgcx.opts.cg.linker_plugin_lto.enabled() => llvm::OptStage::PreLinkThinLTO,
+            _ => llvm::OptStage::PreLinkNoLTO,
+        };
+        // This is our second opt call, so now we run all opts,
+        // to make sure we get the best performance.
+        let skip_size_increasing_opts = false;
+        trace!("running Module Optimization after differentiation");
+        unsafe {
+            llvm_optimize(
+                cgcx,
+                diag_handler.handle(),
+                module,
+                config,
+                opt_level,
+                opt_stage,
+                skip_size_increasing_opts,
+            )?
+        };
+    }
+    trace!("done with differentiate()");
+
+    Ok(())
+}

compiler/rustc_codegen_llvm/src/context.rs

@@ -1,6 +1,6 @@
 use std::borrow::Borrow;
 use std::cell::{Cell, RefCell};
-use std::ffi::{CStr, c_uint};
+use std::ffi::{CStr, c_char, c_uint};
 use std::str;
 
 use rustc_abi::{HasDataLayout, TargetDataLayout, VariantIdx};
@@ -600,6 +600,31 @@ impl<'ll, 'tcx> CodegenCx<'ll, 'tcx> {
             llvm::set_section(g, c"llvm.metadata");
         }
     }
+
+    pub(crate) fn get_metadata_value(&self, metadata: &'ll Metadata) -> &'ll Value {
+        unsafe { llvm::LLVMMetadataAsValue(self.llcx, metadata) }
+    }
+
+    pub(crate) fn get_function(&self, name: &str) -> Option<&'ll Value> {
+        let name = SmallCStr::new(name);
+        unsafe { llvm::LLVMGetNamedFunction(self.llmod, name.as_ptr()) }
+    }
+
+    pub(crate) fn get_md_kind_id(&self, name: &str) -> u32 {
+        unsafe {
+            llvm::LLVMGetMDKindIDInContext(
+                self.llcx,
+                name.as_ptr() as *const c_char,
+                name.len() as c_uint,
+            )
+        }
+    }
+
+    pub(crate) fn create_metadata(&self, name: String) -> Option<&'ll Metadata> {
+        Some(unsafe {
+            llvm::LLVMMDStringInContext2(self.llcx, name.as_ptr() as *const c_char, name.len())
+        })
+    }
 }
 
 impl<'ll, 'tcx> MiscCodegenMethods<'tcx> for CodegenCx<'ll, 'tcx> {

compiler/rustc_codegen_llvm/src/declare.rs

@@ -32,7 +32,7 @@ use crate::{attributes, llvm};
 ///
 /// If there’s a value with the same name already declared, the function will
 /// update the declaration and return existing Value instead.
-fn declare_raw_fn<'ll>(
+pub(crate) fn declare_raw_fn<'ll>(
     cx: &CodegenCx<'ll, '_>,
     name: &str,
     callconv: llvm::CallConv,

compiler/rustc_codegen_llvm/src/errors.rs

@@ -89,6 +89,11 @@ impl<G: EmissionGuarantee> Diagnostic<'_, G> for ParseTargetMachineConfig<'_> {
     }
 }
 
+#[derive(Diagnostic)]
+#[diag(codegen_llvm_autodiff_without_lto)]
+#[note]
+pub(crate) struct AutoDiffWithoutLTO;
+
 #[derive(Diagnostic)]
 #[diag(codegen_llvm_lto_disallowed)]
 pub(crate) struct LtoDisallowed;
@@ -131,6 +136,8 @@ pub enum LlvmError<'a> {
     PrepareThinLtoModule,
     #[diag(codegen_llvm_parse_bitcode)]
     ParseBitcode,
+    #[diag(codegen_llvm_prepare_autodiff)]
+    PrepareAutoDiff { src: String, target: String, error: String },
 }
 
 pub(crate) struct WithLlvmError<'a>(pub LlvmError<'a>, pub String);
@@ -152,6 +159,7 @@ impl<G: EmissionGuarantee> Diagnostic<'_, G> for WithLlvmError<'_> {
             }
             PrepareThinLtoModule => fluent::codegen_llvm_prepare_thin_lto_module_with_llvm_err,
             ParseBitcode => fluent::codegen_llvm_parse_bitcode_with_llvm_err,
+            PrepareAutoDiff { .. } => fluent::codegen_llvm_prepare_autodiff_with_llvm_err,
         };
         self.0
             .into_diag(dcx, level)

compiler/rustc_codegen_llvm/src/lib.rs

@@ -28,9 +28,10 @@ use std::mem::ManuallyDrop;
 
 use back::owned_target_machine::OwnedTargetMachine;
 use back::write::{create_informational_target_machine, create_target_machine};
-use errors::ParseTargetMachineConfig;
+use errors::{AutoDiffWithoutLTO, ParseTargetMachineConfig};
 pub use llvm_util::target_features_cfg;
 use rustc_ast::expand::allocator::AllocatorKind;
+use rustc_ast::expand::autodiff_attrs::AutoDiffItem;
 use rustc_codegen_ssa::back::lto::{LtoModuleCodegen, SerializedModule, ThinModule};
 use rustc_codegen_ssa::back::write::{
     CodegenContext, FatLtoInput, ModuleConfig, TargetMachineFactoryConfig, TargetMachineFactoryFn,
@@ -44,7 +45,7 @@ use rustc_middle::dep_graph::{WorkProduct, WorkProductId};
 use rustc_middle::ty::TyCtxt;
 use rustc_middle::util::Providers;
 use rustc_session::Session;
-use rustc_session::config::{OptLevel, OutputFilenames, PrintKind, PrintRequest};
+use rustc_session::config::{Lto, OptLevel, OutputFilenames, PrintKind, PrintRequest};
 use rustc_span::Symbol;
 
 mod back {
@@ -233,6 +234,20 @@ impl WriteBackendMethods for LlvmCodegenBackend {
     fn serialize_module(module: ModuleCodegen<Self::Module>) -> (String, Self::ModuleBuffer) {
         (module.name, back::lto::ModuleBuffer::new(module.module_llvm.llmod()))
     }
+    /// Generate autodiff rules
+    fn autodiff(
+        cgcx: &CodegenContext<Self>,
+        tcx: TyCtxt<'_>,
+        module: &ModuleCodegen<Self::Module>,
+        diff_fncs: Vec<AutoDiffItem>,
+        config: &ModuleConfig,
+    ) -> Result<(), FatalError> {
+        if cgcx.lto != Lto::Fat {
+            let dcx = cgcx.create_dcx();
+            return Err(dcx.handle().emit_almost_fatal(AutoDiffWithoutLTO));
+        }
+        builder::autodiff::differentiate(module, cgcx, tcx, diff_fncs, config)
+    }
 }
 
 unsafe impl Send for LlvmCodegenBackend {} // Llvm is on a per-thread basis

compiler/rustc_codegen_llvm/src/llvm/enzyme_ffi.rs

@@ -0,0 +1,29 @@
+#![allow(non_camel_case_types)]
+
+use libc::{c_char, c_uint};
+
+use super::ffi::{BasicBlock, Metadata, Module, Type, Value};
+use crate::llvm::Bool;
+extern "C" {
+    // Enzyme
+    pub fn LLVMRustHasMetadata(I: &Value, KindID: c_uint) -> bool;
+    pub fn LLVMRustEraseInstBefore(BB: &BasicBlock, I: &Value);
+    pub fn LLVMRustGetLastInstruction<'a>(BB: &BasicBlock) -> Option<&'a Value>;
+    pub fn LLVMRustDIGetInstMetadata(I: &Value) -> Option<&Metadata>;
+    pub fn LLVMRustEraseInstFromParent(V: &Value);
+    pub fn LLVMRustGetTerminator<'a>(B: &BasicBlock) -> &'a Value;
+    pub fn LLVMRustVerifyFunction(V: &Value, action: LLVMRustVerifierFailureAction) -> Bool;
+
+    pub fn LLVMGetFunctionCallConv(F: &Value) -> c_uint;
+    pub fn LLVMGetReturnType(T: &Type) -> &Type;
+    pub fn LLVMGetParams(Fnc: &Value, parms: *mut &Value);
+    pub fn LLVMGetNamedFunction(M: &Module, Name: *const c_char) -> Option<&Value>;
+}
+
+#[repr(C)]
+#[derive(Copy, Clone, PartialEq)]
+pub enum LLVMRustVerifierFailureAction {
+    LLVMAbortProcessAction = 0,
+    LLVMPrintMessageAction = 1,
+    LLVMReturnStatusAction = 2,
+}

compiler/rustc_codegen_llvm/src/llvm/ffi.rs

@@ -99,7 +99,7 @@ pub enum ModuleFlagMergeBehavior {
 /// LLVM CallingConv::ID. Should we wrap this?
 ///
 /// See <https://github.com/llvm/llvm-project/blob/main/llvm/include/llvm/IR/CallingConv.h>
-#[derive(Copy, Clone, PartialEq, Debug)]
+#[derive(Copy, Clone, PartialEq, Debug, TryFromU32)]
 #[repr(C)]
 pub enum CallConv {
     CCallConv = 0,

compiler/rustc_codegen_llvm/src/llvm/mod.rs

@@ -22,8 +22,11 @@ use crate::common::AsCCharPtr;
 
 pub mod archive_ro;
 pub mod diagnostic;
+pub mod enzyme_ffi;
 mod ffi;
 
+pub use self::enzyme_ffi::*;
+
 impl LLVMRustResult {
     pub fn into_result(self) -> Result<(), ()> {
         match self {