Implement checked Shl/Shr at MIR building.
This does not require any special handling by codegen backends,
as the overflow behaviour is entirely determined by the rhs (shift amount).
This allows MIR ConstProp to remove the overflow check for constant shifts.
~There is an existing different behaviour between cg_llvm and cg_clif (cc `@bjorn3).`
I took cg_llvm's one as reference: overflow if `rhs < 0 || rhs > number_of_bits_in_lhs_ty`.~
EDIT: `cg_llvm` and `cg_clif` implement the overflow check differently. This PR uses `cg_llvm`'s implementation based on a `BitAnd` instead of `cg_clif`'s one based on an unsigned comparison.
Sync rustc_codegen_cranelift
Bunch of bug fixes this time. Also an update to Cranelift 0.93 which adds a brand new optimization pass which cg_clif exposes when using `--release`. And various improvements to cg_clif's test suite, making it faster to run. And finally two small perf improvements.
r? `@ghost`
`@rustbot` label +A-codegen +A-cranelift +T-compiler
Rollup of 7 pull requests
Successful merges:
- #108991 (add `enable-warnings` flag for llvm, and disable it by default.)
- #109109 (Use `unused_generic_params` from crate metadata)
- #109111 (Create dirs for build_triple)
- #109136 (Simplify proc macro signature validity check)
- #109150 (Update cargo)
- #109154 (Fix MappingToUnit to support no span of arg_ty)
- #109157 (Remove mw from review rotation for a while)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
This patched has been necessary for subtree syncs from the start, but
previously it was necessary to locally install tqc's patched git
version, which hasn't been updated for quite a while. I made a small
change to allow downloading it as script without requiring an entire git
installation for the patched version.
Install binaries to the miri toolchain's sysroot
The default install produces this behavior:
```
$ cargo +miri miri --version
miri 0.1.0 (0ba1f4a0 2023-03-05)
$ cargo +nightly miri --version
miri 0.1.0 (0ba1f4a0 2023-03-05)
```
Which is not good. We've effectively erased the toolchain selection, and users may reasonably conclude that their rustup install is broken.
After this change, we now get this:
```
$ cargo +miri miri --version
miri 0.1.0 (0ba1f4a0 2023-03-05)
$ cargo +nightly miri --version
miri 0.1.0 (f63ccaf 2023-03-06)
```
Thanks `@jyn514` who all but wrote this for me.
Update cargo
14 commits in 7d3033d2e59383fd76193daf9423c3d141972a7d..4a3c588b1f0a8e2dc8dd8789dbf3b6a71b02ed49
2023-03-08 17:05:08 +0000 to 2023-03-14 14:05:36 +0000
- ci: make clean-test-output a script for reuse (rust-lang/cargo#11848)
- Accurately show status when downgrading dependencies (rust-lang/cargo#11839)
- docs(contrib): Move Design Principles earlier in the book (rust-lang/cargo#11842)
- docs(contrib): Point compilation docs to doc comments (rust-lang/cargo#11841)
- `cargo install --git` multiple packages with binaries found hint (rust-lang/cargo#11835)
- Disable flaky auth tests when `gitoxide` runs them (rust-lang/cargo#11830)
- Add some documentation on writing cross-compilation tests (rust-lang/cargo#11825)
- chore: Use sparse protocol on stable CI (rust-lang/cargo#11829)
- Notice for potential unexpected shell expansions in help text of `cargo-add` (rust-lang/cargo#11826)
- Add tracking issue to gitoxide unstable docs (rust-lang/cargo#11822)
- Bump crates-io to 0.36.0 (rust-lang/cargo#11820)
- Bump to 0.71.0; update changelog (rust-lang/cargo#11815)
- docs(contrib): Move overview to lib (rust-lang/cargo#11809)
- Fix semver check for 1.68 (rust-lang/cargo#11817)
r? `@ghost`
Simplify proc macro signature validity check
Use an `ObligationCtxt` instead of `normalize_erasing_regions` + `DeepRejectCtxt`. This should both give us a more accurate error message, and also avoid issues like not-well-formed proc macro signatures. Also, let's fall back on the regular type mismatch error reporting for making these diagnostic notes, instead of hard-coding a bunch of specific diagnostics.
Fixes#109129
Use `unused_generic_params` from crate metadata
Due to the way that `separate_provide_extern` interacted with the implementation of `<ty::InstanceDef<'tcx> as Key>::query_crate_is_local`, we actually never hit the foreign provider for `unused_generic_params`.
Additionally, since the *local* provider of `unused_generic_params` calls `should_polymorphize`, which always returns false if the def-id is foreign, this means that we never actually polymorphize monomorphic instances originating from foreign crates.
We don't actually encode `unused_generic_params` for items where all generics are used, so I had to tweak the foreign provider to fall back to `ty::UnusedGenericParams::new_all_used()` to avoid more ICEs when the above bugs were fixed.
add `enable-warnings` flag for llvm, and disable it by default.
This flag allows to turn off warnings of llvm compilation for people who are not interested on those warnings.
Ensure `ptr::read` gets all the same LLVM `load` metadata that dereferencing does
I was looking into `array::IntoIter` optimization, and noticed that it wasn't annotating the loads with `noundef` for simple things like `array::IntoIter<i32, N>`. Trying to narrow it down, it seems that was because `MaybeUninit::assume_init_read` isn't marking the load as initialized (<https://rust.godbolt.org/z/Mxd8TPTnv>), which is unfortunate since that's basically its reason to exist.
The root cause is that `ptr::read` is currently implemented via the *untyped* `copy_nonoverlapping`, and thus the `load` doesn't get any type-aware metadata: no `noundef`, no `!range`. This PR solves that by lowering `ptr::read(p)` to `copy *p` in MIR, for which the backends already do the right thing.
Fortuitiously, this also improves the IR we give to LLVM for things like `mem::replace`, and fixes a couple of long-standing bugs where `ptr::read` on `Copy` types was worse than `*`ing them.
Zulip conversation: <https://rust-lang.zulipchat.com/#narrow/stream/219381-t-libs/topic/Move.20array.3A.3AIntoIter.20to.20ManuallyDrop/near/341189936>
cc `@erikdesjardins` `@JakobDegen` `@workingjubilee` `@the8472`
Fixes#106369Fixes#73258
14 commits in 7d3033d2e59383fd76193daf9423c3d141972a7d..4a3c588b1f0a8e2dc8dd8789dbf3b6a71b02ed49
2023-03-08 17:05:08 +0000 to 2023-03-14 14:05:36 +0000
- ci: make clean-test-output a script for reuse (rust-lang/cargo#11848)
- Accurately show status when downgrading dependencies (rust-lang/cargo#11839)
- docs(contrib): Move Design Principles earlier in the book (rust-lang/cargo#11842)
- docs(contrib): Point compilation docs to doc comments (rust-lang/cargo#11841)
- `cargo install --git` multiple packages with binaries found hint (rust-lang/cargo#11835)
- Disable flaky auth tests when `gitoxide` runs them (rust-lang/cargo#11830)
- Add some documentation on writing cross-compilation tests (rust-lang/cargo#11825)
- chore: Use sparse protocol on stable CI (rust-lang/cargo#11829)
- Notice for potential unexpected shell expansions in help text of `cargo-add` (rust-lang/cargo#11826)
- Add tracking issue to gitoxide unstable docs (rust-lang/cargo#11822)
- Bump crates-io to 0.36.0 (rust-lang/cargo#11820)
- Bump to 0.71.0; update changelog (rust-lang/cargo#11815)
- docs(contrib): Move overview to lib (rust-lang/cargo#11809)
- Fix semver check for 1.68 (rust-lang/cargo#11817)
Instead of building two kinds of drop pair loops, of which only one will
be eventually used at runtime in a given monomorphization, always use
index based loop.
