Lower to a memset(undef) when Rvalue::Repeat repeats uninit
Fixes https://github.com/rust-lang/rust/issues/138625.
It is technically correct to just do nothing. But if we actually do nothing, we may miss that this is de-initializing something, so instead we just lower to a single memset that writes undef. This is still superior to the memcpy loop, in both quality of code we hand to the backend and LLVM's final output.
Lower BinOp::Cmp to llvm.{s,u}cmp.* intrinsics
Lowers `mir::BinOp::Cmp` (`three_way_compare` intrinsic) to the corresponding LLVM `llvm.{s,u}cmp.i8.*` intrinsics.
These are the intrinsics mentioned in https://github.com/rust-lang/rust/pull/118310, which are now available in LLVM 19.
I couldn't find any follow-up PRs/discussions about this, please let me know if I missed something.
r? `@scottmcm`
We intend to fix the outstanding issues on the target and eventually
promote it to tier 2. We have the capacity to maintain this target in
the future and already perform regular builds of rustc for this target.
Currently, all host tools except miri build fine, but I have a patch for
libffi-sys to make miri also compile fine for this target that is
pending review [1].
While at it, add an option for the musl root for this target.
[1]: https://github.com/tov/libffi-rs/pull/100
Signed-off-by: Jens Reidel <adrian@travitia.xyz>
Update books
## rust-lang/book
23 commits in 81a976a237f84b8392c4ce1bd5fd076eb757a2eb..45f05367360f033f89235eacbbb54e8d73ce6b70
2025-03-21 23:23:52 UTC to 2025-03-13 14:14:37 UTC
- Ch. 21: call out Chrome multiple-connections issue (rust-lang/book#4297)
- Ch. 16: refactor 16-6 to using listing component (rust-lang/book#4295)
- Ch. 01: Show how to work offline (rust-lang/book#4294)
- Ch. 07: Clarify sentences about `pub use` (rust-lang/book#4293)
- Ch. 02: Consistent ordering of `use` statements (rust-lang/book#4292)
- Anchors on listings (rust-lang/book#4271)
- Ch. 17: another tweak to how we phrase things about sections (rust-lang/book#4288)
- Ch. 20: correct listing number (rust-lang/book#4287)
- Ch. 10.3: clarify language detail (rust-lang/book#4284)
- Ch. 17: minor typos and link reference (rust-lang/book#4286)
- Ch. 9: correctly demonstrate privacy with module (rust-lang/book#4282)
- Ch. 18: correct discussion of delegation in `Post` methods (rust-lang/book#4281)
- Ch. 20: tell folks to see the Reference for more ABI info (rust-lang/book#4165)
- Ch 10.1 minor clarifications (rust-lang/book#4256)
- Clarified the misunderstanding b/w crates, module, items (rust-lang/book#4232)
- Ferris: always show, even when it’s small (rust-lang/book#4280)
- Ch. 17: mention `use std::pin::{Pin, pin};` on introduction (rust-lang/book#4279)
- Persist printing error, NOT ErrorKind (rust-lang/book#4259)
- Typo: "2" should be "2 seconds" (rust-lang/book#4263)
- Ch. 17: fix tiny example consistency issue (rust-lang/book#4270)
- Bump ring from 0.17.8 to 0.17.13 in /listings/ch17-async-await/listing-17-02 (rust-lang/book#4261)
- Bump ring from 0.17.8 to 0.17.14 in /packages/trpl (rust-lang/book#4273)
- 2024 Print Edition: updates to Word docs and more fixes to Markdown text (rust-lang/book#4272)
## rust-lang/reference
5 commits in dda31c85f2ef2e5d2f0f2f643c9231690a30a626..e95ebdfee02514d93f79ec92ae310a804e87f01f
2025-03-24 15:56:46 UTC to 2025-03-18 02:25:06 UTC
- Fix diagnostic attribute typo (rust-lang/reference#1767)
- Mention that “every address” ≠ “every pointer” (rust-lang/reference#1761)
- Rework range pattern rules (rust-lang/reference#1756)
- Use warning block in behavior-considered-undefined (rust-lang/reference#1759)
- Add reference for asm-goto (rust-lang/reference#1693)
`with_scope` is only ever used for ast modules
Thus I renamed it to match other similar functions (`with_mod_rib`) and made it panic if used on non-modules
Rework `--print` options documentation
This PR reworks the `--print` options documentation, by making it more like codegen options with a dedicated page.
I also added some examples and split some paragraph into multiple paragraph since we now have more place.
r? ```@jieyouxu```
match lowering cleanup: remove unused unsizing logic from `non_scalar_compare`
Since array and slice constants are now translated to array and slice patterns, `non_scalar_compare` is only used for string comparisons. This specializes it to strings, renames it, and removes the unused array-unsizing logic.
This also updates the doc comments for `thir::PatKind::Constant` and `TestKind::Eq`, which referred to them being used for slice references.
r? ````@oli-obk````
remove remnants of const_box feature
This feature requires major design work, and the few methods it gates currently aren't actually useful. Let's reset to a clean slate so when a design materializes, we can start from scratch.
Closes https://github.com/rust-lang/rust/issues/92521 by removing the feature it tracks.
r? ````@oli-obk````
Implement some basics in UEFI fs
- Just getting some basics out of the way while waiting for #138236 to be merged.
- Adds `fs::canonicalize`. Should be same as absolute in case of UEFI since there is no symlink support and absolute path is guaranteed to be uniqe according to spec.
- Make `fs::lstat` same as `fs::stat`. Should be same since UEFI does not have symlink support.
- Implement `OptionOptions`.
cc ````@nicholasbishop```` ````@dvdhrm````
This fixes two problems with the autofixes for the `unused_imports`
lint:
- `use std::collections::{HashMap, self as coll};` would suggest, when
`HashMap` is unused, the incorrect `use std::collections::self as coll;`
which does not compile.
- `use std::borrow::{self, Cow};` would suggest, when `self` is unused,
`use std::borrow::{Cow};`, which contains unnecessary brackets.
Optimize hash map operations in the query system
This optimizes hash map operations in the query system by explicitly passing hashes and using more optimal operations. `find_or_find_insert_slot` in particular saves a hash table lookup over `entry`. It's not yet available in a safe API, but will be in https://github.com/rust-lang/hashbrown/pull/466.
<table><tr><td rowspan="2">Benchmark</td><td colspan="1"><b>Before</b></th><td colspan="2"><b>After</b></th></tr><tr><td align="right">Time</td><td align="right">Time</td><td align="right">%</th></tr><tr><td>🟣 <b>clap</b>:check</td><td align="right">1.6189s</td><td align="right">1.6129s</td><td align="right"> -0.37%</td></tr><tr><td>🟣 <b>hyper</b>:check</td><td align="right">0.2353s</td><td align="right">0.2337s</td><td align="right"> -0.67%</td></tr><tr><td>🟣 <b>regex</b>:check</td><td align="right">0.9344s</td><td align="right">0.9289s</td><td align="right"> -0.59%</td></tr><tr><td>🟣 <b>syn</b>:check</td><td align="right">1.4693s</td><td align="right">1.4652s</td><td align="right"> -0.28%</td></tr><tr><td>🟣 <b>syntex_syntax</b>:check</td><td align="right">5.6606s</td><td align="right">5.6439s</td><td align="right"> -0.30%</td></tr><tr><td>Total</td><td align="right">9.9185s</td><td align="right">9.8846s</td><td align="right"> -0.34%</td></tr><tr><td>Summary</td><td align="right">1.0000s</td><td align="right">0.9956s</td><td align="right"> -0.44%</td></tr></table>
r? `@cjgillot`
The newly added pattern types validity tests fail on s390x and
presumably other big-endian systems, due to print of raw values
with padding bytes.
To fix the tests remove the raw output values in the error note by
`normalize-stderr`.
They're dodgy, covering all the keywords, including weak ones, and
edition-specific ones without considering the edition. They have a
single use in rustfmt. This commit changes that use to
`is_reserved_ident`, which is a much more widely used alternative and is
good enough, judging by the lack of effect on the test suite.
Looks like unfortunately the `--diff-merges` flag is a `git show`-only
command, not `git rev-list`.
This reverts commit 95994f94ff, reversing
changes made to 7290b04b0a.
UEFI does not have specific modes for create_new, truncate and append.
So those need to to be simulated after opening the file.
Signed-off-by: Ayush Singh <ayush@beagleboard.org>
- Should be same as absolute in UEFI since there are no symlinks.
- Also each absolute path representation should be unique according to
the UEFI specification.
Signed-off-by: Ayush Singh <ayush@beagleboard.org>
PRs #136842 (Add libstd support for Trusty targets), #137793 (Stablize
anonymous pipe), and #136929 (std: move process implementations to
`sys`) merged around the same time, so update Trusty to take them into
account.
