Auto merge of #117987 - bjorn3:sync_cg_clif-2023-11-16, r=bjorn3

Subtree sync for rustc_codegen_cranelift

The main highlights this time are support for AES and SHA256 crypto intrinsics on x86_64 by lowering to inline asm.

r? `@ghost`

`@rustbot` label +A-codegen +A-cranelift +T-compiler

compiler/rustc_codegen_cranelift/.github/workflows/abi-cafe.yml

@@ -35,6 +35,10 @@ jobs:
     steps:
     - uses: actions/checkout@v3
 
+    - name: CPU features
+      if: matrix.os == 'ubuntu-latest'
+      run: cat /proc/cpuinfo
+
     - name: Cache cargo target dir
       uses: actions/cache@v3
       with:

compiler/rustc_codegen_cranelift/.github/workflows/main.yml

@@ -66,6 +66,10 @@ jobs:
     steps:
     - uses: actions/checkout@v3
 
+    - name: CPU features
+      if: matrix.os == 'ubuntu-latest'
+      run: cat /proc/cpuinfo
+
     - name: Cache cargo target dir
       uses: actions/cache@v3
       with:
@@ -136,6 +140,9 @@ jobs:
     steps:
     - uses: actions/checkout@v3
 
+    - name: CPU features
+      run: cat /proc/cpuinfo
+
     - name: Prepare dependencies
       run: ./y.sh prepare
 
@@ -159,6 +166,9 @@ jobs:
     steps:
     - uses: actions/checkout@v3
 
+    - name: CPU features
+      run: cat /proc/cpuinfo
+
     - name: Cache cargo target dir
       uses: actions/cache@v3
       with:

compiler/rustc_codegen_cranelift/.github/workflows/rustc.yml

@@ -11,6 +11,9 @@ jobs:
     steps:
     - uses: actions/checkout@v3
 
+    - name: CPU features
+      run: cat /proc/cpuinfo
+
     - name: Cache cargo target dir
       uses: actions/cache@v3
       with:
@@ -31,6 +34,9 @@ jobs:
     steps:
     - uses: actions/checkout@v3
 
+    - name: CPU features
+      run: cat /proc/cpuinfo
+
     - name: Cache cargo target dir
       uses: actions/cache@v3
       with:

compiler/rustc_codegen_cranelift/Readme.md

@@ -5,8 +5,48 @@ This has the potential to improve compilation times in debug mode.
 If your project doesn't use any of the things listed under "Not yet supported", it should work fine.
 If not please open an issue.
 
+## Download using Rustup
+
+The Cranelift codegen backend is distributed in nightly builds on Linux and x86_64 macOS. If you want to
+install it using Rustup, you can do that by running:
+
+```bash
+$ rustup component add rustc-codegen-cranelift-preview --toolchain nightly
+```
+
+Once it is installed, you can enable it with one of the following approaches:
+- `CARGO_PROFILE_DEV_CODEGEN_BACKEND=cranelift cargo +nightly build -Zcodegen-backend`
+- `RUSTFLAGS="-Zcodegen-backend=cranelift" cargo +nightly build`
+- Add the following to `.cargo/config.toml`:
+    ```toml
+    [unstable]
+    codegen-backend = true
+
+    [profile.dev]
+    codegen-backend = "cranelift"
+    ```
+- Add the following to `Cargo.toml`:
+    ```toml
+    # This line needs to come before anything else in Cargo.toml
+    cargo-features = ["codegen-backend"]
+
+    [profile.dev]
+    codegen-backend = "cranelift"
+    ```
+
+## Precompiled builds
+
+You can also download a pre-built version from the [releases] page.
+Extract the `dist` directory in the archive anywhere you want.
+If you want to use `cargo clif build` instead of having to specify the full path to the `cargo-clif` executable, you can add the `bin` subdirectory of the extracted `dist` directory to your `PATH`.
+(tutorial [for Windows](https://stackoverflow.com/a/44272417), and [for Linux/MacOS](https://unix.stackexchange.com/questions/26047/how-to-correctly-add-a-path-to-path/26059#26059)).
+
+[releases]: https://github.com/rust-lang/rustc_codegen_cranelift/releases/tag/dev
+
 ## Building and testing
 
+If you want to build the backend manually, you can download it from GitHub and build it yourself:
+
 ```bash
 $ git clone https://github.com/rust-lang/rustc_codegen_cranelift
 $ cd rustc_codegen_cranelift
@@ -22,15 +62,6 @@ $ ./test.sh
 
 For more docs on how to build and test see [build_system/usage.txt](build_system/usage.txt) or the help message of `./y.sh`.
 
-## Precompiled builds
-
-Alternatively you can download a pre built version from the [releases] page.
-Extract the `dist` directory in the archive anywhere you want.
-If you want to use `cargo clif build` instead of having to specify the full path to the `cargo-clif` executable, you can add the `bin` subdirectory of the extracted `dist` directory to your `PATH`.
-(tutorial [for Windows](https://stackoverflow.com/a/44272417), and [for Linux/MacOS](https://unix.stackexchange.com/questions/26047/how-to-correctly-add-a-path-to-path/26059#26059)).
-
-[releases]: https://github.com/rust-lang/rustc_codegen_cranelift/releases/tag/dev
-
 ## Usage
 
 rustc_codegen_cranelift can be used as a near-drop-in replacement for `cargo build` or `cargo run` for existing projects.

compiler/rustc_codegen_cranelift/rust-toolchain

@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2023-11-10"
+channel = "nightly-2023-11-16"
 components = ["rust-src", "rustc-dev", "llvm-tools"]

compiler/rustc_codegen_cranelift/scripts/rustup.sh

@@ -46,7 +46,7 @@ case $1 in
         git pull origin master
         branch=sync_cg_clif-$(date +%Y-%m-%d)
         git checkout -b "$branch"
-        "$cg_clif/git-fixed-subtree.sh" pull --prefix=compiler/rustc_codegen_cranelift/ https://github.com/bjorn3/rustc_codegen_cranelift.git master
+        "$cg_clif/git-fixed-subtree.sh" pull --prefix=compiler/rustc_codegen_cranelift/ https://github.com/rust-lang/rustc_codegen_cranelift.git master
         git push -u my "$branch"
 
         # immediately merge the merge commit into cg_clif to prevent merge conflicts when syncing

compiler/rustc_codegen_cranelift/scripts/setup_rust_fork.sh

@@ -1,15 +1,17 @@
 #!/usr/bin/env bash
 set -e
 
+# CG_CLIF_FORCE_GNU_AS will force usage of as instead of the LLVM backend of rustc as we
+# the LLVM backend isn't compiled in here.
+export CG_CLIF_FORCE_GNU_AS=1
+
 # Compiletest expects all standard library paths to start with /rustc/FAKE_PREFIX.
 # CG_CLIF_STDLIB_REMAP_PATH_PREFIX will cause cg_clif's build system to pass
 # --remap-path-prefix to handle this.
-# CG_CLIF_FORCE_GNU_AS will force usage of as instead of the LLVM backend of rustc as we
-# the LLVM backend isn't compiled in here.
-CG_CLIF_FORCE_GNU_AS=1 CG_CLIF_STDLIB_REMAP_PATH_PREFIX=/rustc/FAKE_PREFIX ./y.sh build
+CG_CLIF_STDLIB_REMAP_PATH_PREFIX=/rustc/FAKE_PREFIX ./y.sh build
 
 echo "[SETUP] Rust fork"
-git clone https://github.com/rust-lang/rust.git || true
+git clone https://github.com/rust-lang/rust.git --filter=tree:0 || true
 pushd rust
 git fetch
 git checkout -- .

compiler/rustc_codegen_cranelift/scripts/test_bootstrap.sh

@@ -11,7 +11,5 @@ rm -r compiler/rustc_codegen_cranelift/{Cargo.*,src}
 cp ../Cargo.* compiler/rustc_codegen_cranelift/
 cp -r ../src compiler/rustc_codegen_cranelift/src
 
-# CG_CLIF_FORCE_GNU_AS will force usage of as instead of the LLVM backend of rustc as we
-# the LLVM backend isn't compiled in here.
-CG_CLIF_FORCE_GNU_AS=1 ./x.py build --stage 1 library/std
+./x.py build --stage 1 library/std
 popd

compiler/rustc_codegen_cranelift/src/abi/mod.rs

@@ -383,6 +383,7 @@ pub(crate) fn codegen_terminator_call<'tcx>(
                 args,
                 ret_place,
                 target,
+                source_info.span,
             );
             return;
         }

compiler/rustc_codegen_cranelift/src/base.rs

@@ -456,7 +456,7 @@ fn codegen_fn_body(fx: &mut FunctionCx<'_, '_, '_>, start_block: Block) {
                     );
                 }
 
-                crate::inline_asm::codegen_inline_asm(
+                crate::inline_asm::codegen_inline_asm_terminator(
                     fx,
                     source_info.span,
                     template,

compiler/rustc_codegen_cranelift/src/constant.rs

@@ -1,10 +1,13 @@
 //! Handling of `static`s, `const`s and promoted allocations
 
+use std::cmp::Ordering;
+
 use cranelift_module::*;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrFlags;
 use rustc_middle::mir::interpret::{read_target_uint, AllocId, GlobalAlloc, Scalar};
 use rustc_middle::mir::ConstValue;
+use rustc_middle::ty::ScalarInt;
 
 use crate::prelude::*;
 
@@ -430,17 +433,17 @@ fn define_all_allocs(tcx: TyCtxt<'_>, module: &mut dyn Module, cx: &mut Constant
 pub(crate) fn mir_operand_get_const_val<'tcx>(
     fx: &FunctionCx<'_, '_, 'tcx>,
     operand: &Operand<'tcx>,
-) -> Option<ConstValue<'tcx>> {
+) -> Option<ScalarInt> {
     match operand {
-        Operand::Constant(const_) => Some(eval_mir_constant(fx, const_).0),
+        Operand::Constant(const_) => eval_mir_constant(fx, const_).0.try_to_scalar_int(),
         // FIXME(rust-lang/rust#85105): Casts like `IMM8 as u32` result in the const being stored
         // inside a temporary before being passed to the intrinsic requiring the const argument.
         // This code tries to find a single constant defining definition of the referenced local.
         Operand::Copy(place) | Operand::Move(place) => {
             if !place.projection.is_empty() {
                 return None;
             }
-            let mut computed_const_val = None;
+            let mut computed_scalar_int = None;
             for bb_data in fx.mir.basic_blocks.iter() {
                 for stmt in &bb_data.statements {
                     match &stmt.kind {
@@ -456,22 +459,38 @@ pub(crate) fn mir_operand_get_const_val<'tcx>(
                                     operand,
                                     ty,
                                 ) => {
-                                    if computed_const_val.is_some() {
+                                    if computed_scalar_int.is_some() {
                                         return None; // local assigned twice
                                     }
                                     if !matches!(ty.kind(), ty::Uint(_) | ty::Int(_)) {
                                         return None;
                                     }
-                                    let const_val = mir_operand_get_const_val(fx, operand)?;
-                                    if fx.layout_of(*ty).size
-                                        != const_val.try_to_scalar_int()?.size()
+                                    let scalar_int = mir_operand_get_const_val(fx, operand)?;
+                                    let scalar_int = match fx
+                                        .layout_of(*ty)
+                                        .size
+                                        .cmp(&scalar_int.size())
                                     {
-                                        return None;
-                                    }
-                                    computed_const_val = Some(const_val);
+                                        Ordering::Equal => scalar_int,
+                                        Ordering::Less => match ty.kind() {
+                                            ty::Uint(_) => ScalarInt::try_from_uint(
+                                                scalar_int.try_to_uint(scalar_int.size()).unwrap(),
+                                                fx.layout_of(*ty).size,
+                                            )
+                                            .unwrap(),
+                                            ty::Int(_) => ScalarInt::try_from_int(
+                                                scalar_int.try_to_int(scalar_int.size()).unwrap(),
+                                                fx.layout_of(*ty).size,
+                                            )
+                                            .unwrap(),
+                                            _ => unreachable!(),
+                                        },
+                                        Ordering::Greater => return None,
+                                    };
+                                    computed_scalar_int = Some(scalar_int);
                                 }
                                 Rvalue::Use(operand) => {
-                                    computed_const_val = mir_operand_get_const_val(fx, operand)
+                                    computed_scalar_int = mir_operand_get_const_val(fx, operand)
                                 }
                                 _ => return None,
                             }
@@ -522,7 +541,7 @@ pub(crate) fn mir_operand_get_const_val<'tcx>(
                     TerminatorKind::Call { .. } => {}
                 }
             }
-            computed_const_val
+            computed_scalar_int
         }
     }
 }