update autodiff docs in the dev guide

Author: ZuseZ4

src/autodiff/debugging.md

@@ -25,7 +25,7 @@ The actual numbers will depend on your code.
 
 ## 2) Check your llvm-ir reproducer
 
-To confirm that your previous step worked, we will use llvm's `opt` tool. find your path to the opt binary, with a path similar to `<some_dir>/rust/build/<x86/arm/...-target-triple>/build/bin/opt`. also find `llvmenzyme-19.<so/dll/dylib>` path, similar to `/rust/build/target-triple/enzyme/build/enzyme/llvmenzyme-19`. Please keep in mind that llvm frequently updates it's llvm backend, so the version number might be higher (20, 21, ...). Once you have both, run the following command:
+To confirm that your previous step worked, we will use llvm's `opt` tool. Find your path to the opt binary, with a path similar to `<some_dir>/rust/build/<x86/arm/...-target-triple>/ci-llvm/bin/opt`. If you build LLVM from source, you'll likely need to replace `ci-llvm` with `build`. Also find `llvmenzyme-21.<so/dll/dylib>` path, similar to `/rust/build/target-triple/enzyme/build/enzyme/llvmenzyme-21`. Please keep in mind that llvm frequently updates it's llvm backend, so the version number might be higher (20, 21, ...). Once you have both, run the following command:
 
 ```sh
 <path/to/opt> out.ll -load-pass-plugin=/path/to/build/<target-triple>/stage1/lib/libEnzyme-21.so -passes="enzyme" -enzyme-strict-aliasing=0  -s

src/autodiff/installation.md

@@ -8,7 +8,7 @@ First you need to clone and configure the Rust repository:
 ```bash
 git clone git@github.com:rust-lang/rust
 cd rust
-./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
+./configure --release-channel=nightly --enable-llvm-enzyme --enable-llvm-assertions --enable-option-checking --disable-docs --set llvm.download-ci-llvm=true
 ```
 
 Afterwards you can build rustc using:
@@ -47,7 +47,7 @@ Then build rustc in a slightly altered way:
 ```bash
 git clone https://github.com/rust-lang/rust
 cd rust
-./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
+./configure --release-channel=nightly --enable-llvm-enzyme --enable-llvm-assertions --enable-option-checking --disable-docs --set llvm.download-ci-llvm=true
 ./x dist
 ```
 We then copy the tarball to our host. The dockerid is the newest entry under `docker ps -a`.
@@ -84,5 +84,5 @@ 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
 ```
-This will build Enzyme, and you can find it in `Enzyme/enzyme/build/lib/<LLD/Clang/LLVM>Enzyme.so`. (Endings might differ based on your OS).
+This will build Enzyme, and you can find it in `Enzyme/enzyme/build/lib/<LLD/Clang/LLVM/lib>Enzyme.so`. (Endings might differ based on your OS).