Cleanup Rust-Enzyme history

Co-authored-by: Lorenz Schmidt git@lorenzschmidt.com
Co-authored-by: William Moses gh@wsmoses.com

.github/workflows/enzyme-ci.yml

@@ -0,0 +1,38 @@
+name: Rust CI
+
+on: 
+  push:
+    branches:
+    - master
+  pull_request:
+    branches:
+    - master
+  merge_group:
+
+jobs:
+  build:
+    name: Rust Integration CI LLVM ${{ matrix.llvm }} ${{ matrix.build }} ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [openstack22]
+
+    timeout-minutes: 600
+    steps:
+      - name: checkout the source code
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 2
+      - name: build
+        run: |
+          mkdir build
+          cd build
+          ../configure --enable-llvm-link-shared --enable-llvm-plugins --enable-llvm-enzyme --release-channel=nightly --enable-llvm-assertions --enable-clang --enable-lld --enable-option-checking --enable-ninja --disable-docs
+          ../x.py build --stage 1 library/std library/proc_macro library/test tools/rustdoc
+          rustup toolchain link enzyme `pwd`/build/`rustup target list --installed`/stage1
+          rustup toolchain install nightly # enables -Z unstable-options
+      - name: test
+        run: |
+          cargo +enzyme test --examples

.gitmodules

@@ -43,3 +43,6 @@
 	path = library/backtrace
 	url = https://github.com/rust-lang/backtrace-rs.git
 	shallow = true
+[submodule "src/tools/enzyme"]
+	path = src/tools/enzyme
+	url = https://github.com/EnzymeAD/Enzyme.git

Cargo.lock

@@ -4312,6 +4312,7 @@ dependencies = [
  "rustc_middle",
  "rustc_session",
  "rustc_span",
+ "rustc_symbol_mangling",
  "rustc_target",
  "serde",
  "serde_json",

Cargo.toml

@@ -61,6 +61,7 @@ exclude = [
   "src/tools/x",
   # stdarch has its own Cargo workspace
   "library/stdarch",
+  "library/autodiff",
 ]
 
 [profile.release.package.compiler_builtins]

README.md

@@ -1,9 +1,68 @@
-# The Rust Programming Language
+# The Rust Programming Language +Enzyme
 
 [![Rust Community](https://img.shields.io/badge/Rust_Community%20-Join_us-brightgreen?style=plastic&logo=rust)](https://www.rust-lang.org/community)
 
 This is the main source code repository for [Rust]. It contains the compiler,
-standard library, and documentation.
+standard library, and documentation. It is modified to use Enzyme for AutoDiff.
+
+Please configure this fork using the following command:
+
+```
+mkdir build
+cd build
+../configure --enable-llvm-link-shared --enable-llvm-plugins --enable-llvm-enzyme --release-channel=nightly --enable-llvm-assertions --enable-clang --enable-lld --enable-option-checking --enable-ninja --disable-docs
+```
+
+Afterwards you can build rustc using:
+```
+../x.py build --stage 1 library/std library/proc_macro library/test tools/rustdoc
+```
+
+Afterwards rustc toolchain link will allow you to use it through cargo:
+```
+rustup toolchain link enzyme `pwd`/build/`rustup target list --installed`/stage1
+rustup toolchain install nightly # enables -Z unstable-options
+```
+
+You can then look at examples in the `library/autodiff/examples/*` folder and run them with
+
+```bash
+# rosenbrock forward iteration
+cargo +enzyme run --example rosenbrock_fwd_iter --release
+
+# or all of them
+cargo +enzyme test --examples
+```
+
+## Enzyme Config
+To help with debugging, Enzyme can be configured using environment variables.
+```bash
+export ENZYME_PRINT_TA=1
+export ENZYME_PRINT_AA=1
+export ENZYME_PRINT=1
+export ENZYME_PRINT_MOD=1
+export ENZYME_PRINT_MOD_AFTER=1
+```
+The first three will print TypeAnalysis, ActivityAnalysis and the llvm-ir on a function basis, respectively.
+The last two variables will print the whole module directly before and after Enzyme differented the functions. 
+
+When experimenting with flags please make sure that EnzymeStrictAliasing=0
+is not changed, since it is required for Enzyme to handle enums correctly.
+
+## Bug reporting
+Bugs are pretty much expected at this point of the development process.
+In order to help us please minimize the Rust code as far as possible.
+This tool might be a nicer helper: https://github.com/Nilstrieb/cargo-minimize
+If you have some knowledge of LLVM-IR we also greatly appreciate it if you could help
+us by compiling your minimized Rust code to LLVM-IR and reducing it further.
+
+The only exception to this strategy is error based on "Can not deduce type of X",
+where reducing your example will make it harder for us to understand the origin of the bug.
+In this case please just try to inline all dependencies into a single crate or even file,
+without deleting used code.
+
+
+
 
 [Rust]: https://www.rust-lang.org/
 

compiler/rustc_ast/src/mut_visit.rs

@@ -381,7 +381,7 @@ pub fn visit_bounds<T: MutVisitor>(bounds: &mut GenericBounds, vis: &mut T) {
 }
 
 // No `noop_` prefix because there isn't a corresponding method in `MutVisitor`.
-pub fn visit_fn_sig<T: MutVisitor>(FnSig { header, decl, span }: &mut FnSig, vis: &mut T) {
+pub fn visit_fn_sig<T: MutVisitor>(FnSig { header, decl, span, .. }: &mut FnSig, vis: &mut T) {
     vis.visit_fn_header(header);
     vis.visit_fn_decl(decl);
     vis.visit_span(span);

compiler/rustc_codegen_llvm/src/attributes.rs

@@ -285,6 +285,7 @@ pub fn from_fn_attrs<'ll, 'tcx>(
     instance: ty::Instance<'tcx>,
 ) {
     let codegen_fn_attrs = cx.tcx.codegen_fn_attrs(instance.def_id());
+    let autodiff_attrs = cx.tcx.autodiff_attrs(instance.def_id());
 
     let mut to_add = SmallVec::<[_; 16]>::new();
 
@@ -302,6 +303,8 @@ pub fn from_fn_attrs<'ll, 'tcx>(
     let inline =
         if codegen_fn_attrs.inline == InlineAttr::None && instance.def.requires_inline(cx.tcx) {
             InlineAttr::Hint
+        } else if autodiff_attrs.is_active() {
+            InlineAttr::Never
         } else {
             codegen_fn_attrs.inline
         };

compiler/rustc_codegen_llvm/src/back/lto.rs

@@ -273,6 +273,7 @@ fn fat_lto(
         info!("pushing cached module {:?}", wp.cgu_name);
         (buffer, CString::new(wp.cgu_name).unwrap())
     }));
+
     for module in modules {
         match module {
             FatLtoInput::InMemory(m) => in_memory.push(m),
@@ -734,7 +735,7 @@ pub unsafe fn optimize_thin_module(
     let llcx = llvm::LLVMRustContextCreate(cgcx.fewer_names);
     let llmod_raw = parse_module(llcx, module_name, thin_module.data(), &diag_handler)? as *const _;
     let mut module = ModuleCodegen {
-        module_llvm: ModuleLlvm { llmod_raw, llcx, tm },
+        module_llvm: ModuleLlvm { llmod_raw, llcx, tm, typetrees: Default::default() },
         name: thin_module.name().to_string(),
         kind: ModuleKind::Regular,
     };