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| <h1 id="installation"><a class="header" href="#installation">Installation</a></h1> |
| <p>In the near future, <code>std::autodiff</code> should become available in nightly builds for users. As a contributor however, you will still need to build rustc from source. Please be aware that the msvc target is not supported at the moment, all other tier 1 targets should work. Please open an issue if you encounter any problems on a supported tier 1 target, or if you successfully build this project on a tier2/tier3 target.</p> |
| <h2 id="build-instructions"><a class="header" href="#build-instructions">Build instructions</a></h2> |
| <p>First you need to clone and configure the Rust repository. Based on your preferences, you might also want to <code>--enable-clang</code> or <code>--enable-lld</code>.</p> |
| <pre><code class="language-bash">git clone git@github.com:rust-lang/rust |
| cd rust |
| ./configure --release-channel=nightly --enable-llvm-enzyme --enable-llvm-link-shared --enable-llvm-assertions --enable-ninja --enable-option-checking --disable-docs --set llvm.download-ci-llvm=false |
| </code></pre> |
| <p>Afterwards you can build rustc using:</p> |
| <pre><code class="language-bash">./x build --stage 1 library |
| </code></pre> |
| <p>Afterwards rustc toolchain link will allow you to use it through cargo:</p> |
| <pre><code>rustup toolchain link enzyme build/host/stage1 |
| rustup toolchain install nightly # enables -Z unstable-options |
| </code></pre> |
| <p>You can then run our test cases:</p> |
| <pre><code class="language-bash">./x test --stage 1 tests/codegen-llvm/autodiff |
| ./x test --stage 1 tests/pretty/autodiff |
| ./x test --stage 1 tests/ui/autodiff |
| ./x test --stage 1 tests/ui/feature-gates/feature-gate-autodiff.rs |
| </code></pre> |
| <p>Autodiff is still experimental, so if you want to use it in your own projects, you will need to add <code>lto="fat"</code> to your Cargo.toml |
| and use <code>RUSTFLAGS="-Zautodiff=Enable" cargo +enzyme</code> instead of <code>cargo</code> or <code>cargo +nightly</code>.</p> |
| <h2 id="compiler-explorer-and-dist-builds"><a class="header" href="#compiler-explorer-and-dist-builds">Compiler Explorer and dist builds</a></h2> |
| <p>Our compiler explorer instance can be updated to a newer rustc in a similar way. First, prepare a docker instance.</p> |
| <pre><code class="language-bash">docker run -it ubuntu:22.04 |
| export CC=clang CXX=clang++ |
| apt update |
| apt install wget vim python3 git curl libssl-dev pkg-config lld ninja-build cmake clang build-essential |
| </code></pre> |
| <p>Then build rustc in a slightly altered way:</p> |
| <pre><code class="language-bash">git clone https://github.com/rust-lang/rust |
| cd rust |
| ./configure --release-channel=nightly --enable-llvm-enzyme --enable-llvm-link-shared --enable-llvm-assertions --enable-ninja --enable-option-checking --disable-docs --set llvm.download-ci-llvm=false |
| ./x dist |
| </code></pre> |
| <p>We then copy the tarball to our host. The dockerid is the newest entry under <code>docker ps -a</code>.</p> |
| <pre><code class="language-bash">docker cp <dockerid>:/rust/build/dist/rust-nightly-x86_64-unknown-linux-gnu.tar.gz rust-nightly-x86_64-unknown-linux-gnu.tar.gz |
| </code></pre> |
| <p>Afterwards we can create a new (pre-release) tag on the EnzymeAD/rust repository and make a PR against the EnzymeAD/enzyme-explorer repository to update the tag. |
| Remember to ping <code>tgymnich</code> on the PR to run his update script. Note: We should archive EnzymeAD/rust and update the instructions here. The explorer should soon |
| be able to get the rustc toolchain from the official rust servers.</p> |
| <h2 id="build-instruction-for-enzyme-itself"><a class="header" href="#build-instruction-for-enzyme-itself">Build instruction for Enzyme itself</a></h2> |
| <p>Following the Rust build instruction above will build LLVMEnzyme, LLDEnzyme, and ClangEnzyme along with the Rust compiler. |
| We recommend that approach, if you just want to use any of them and have no experience with cmake. |
| However, if you prefer to just build Enzyme without Rust, then these instructions might help.</p> |
| <pre><code class="language-bash">git clone git@github.com:llvm/llvm-project |
| cd llvm-project |
| mkdir build |
| cd build |
| cmake -G Ninja ../llvm -DLLVM_TARGETS_TO_BUILD="host" -DLLVM_ENABLE_ASSERTIONS=ON -DLLVM_ENABLE_PROJECTS="clang;lld" -DLLVM_ENABLE_RUNTIMES="openmp" -DLLVM_ENABLE_PLUGINS=ON -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=. |
| ninja |
| ninja install |
| </code></pre> |
| <p>This gives you a working LLVM build, now we can continue with building Enzyme. |
| Leave the <code>llvm-project</code> folder, and execute the following commands:</p> |
| <pre><code class="language-bash">git clone git@github.com:EnzymeAD/Enzyme |
| cd Enzyme/enzyme |
| mkdir build |
| cd build |
| cmake .. -G Ninja -DLLVM_DIR=<YourLocalPath>/llvm-project/build/lib/cmake/llvm/ -DLLVM_EXTERNAL_LIT=<YourLocalPath>/llvm-project/llvm/utils/lit/lit.py -DCMAKE_BUILD_TYPE=Release -DCMAKE_EXPORT_COMPILE_COMMANDS=YES -DBUILD_SHARED_LIBS=ON |
| ninja |
| </code></pre> |
| <p>This will build Enzyme, and you can find it in <code>Enzyme/enzyme/build/lib/<LLD/Clang/LLVM/lib>Enzyme.so</code>. (Endings might differ based on your OS).</p> |
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