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bors 733b47ea4b Auto merge of #138759 - scottmcm:operand-builder, r=saethlin 
Allow `enum` and `union` literals to also create SSA values

Today, `Some(x)` always goes through an `alloca`, even in trivial cases where the niching means the constructor doesn't even change the value.

For example, <https://rust.godbolt.org/z/6KG6PqoYz>
```rust
pub fn demo(r: &i32) -> Option<&i32> {
    Some(r)
}
```
currently emits the IR
```llvm
define align 4 ptr `@demo(ptr` align 4 %r) unnamed_addr {
start:
  %_0 = alloca [8 x i8], align 8
  store ptr %r, ptr %_0, align 8
  %0 = load ptr, ptr %_0, align 8
  ret ptr %0
}
```
but with this PR it becomes just
```llvm
define align 4 ptr `@demo(ptr` align 4 %r) unnamed_addr {
start:
  ret ptr %r
}
```
(Of course the optimizer can clean that up, but it'd be nice if it didn't have to -- especially in debug where it doesn't run.  This is like rust-lang/rust#123886, but that only handled non-simd `struct`s -- this PR generalizes it to all non-simd ADTs.)

Doing this means handing variants other than `FIRST_VARIANT`, handling the active field for unions, refactoring the discriminant code so the Place and Operand parts can share the calculation, etc.

Other PRs that led up to this one:
- https://github.com/rust-lang/rust/pull/142005
- https://github.com/rust-lang/rust/pull/142103
- https://github.com/rust-lang/rust/pull/142324
- https://github.com/rust-lang/rust/pull/142383

---

try-job: aarch64-gnu
2025-07-05 01:37:08 +00:00
..
rustc Revert "Use workspace lints for crates in compiler/ #138084" 2025-03-10 18:12:47 +08:00
rustc_abi Remove PointerLike trait 2025-07-03 20:03:49 +00:00
rustc_arena Introduce Arena::try_alloc_from_iter. 2025-04-19 01:13:18 +00:00
rustc_ast Rollup merge of #143380 - cjgillot:kw_span, r=compiler-errors 2025-07-04 05:47:27 +02:00
rustc_ast_ir Use -Wunused_crate_dependencies for compiler crates. 2025-03-20 08:59:43 +11:00
rustc_ast_lowering Rollup merge of #143380 - cjgillot:kw_span, r=compiler-errors 2025-07-04 05:47:27 +02:00
rustc_ast_passes Rollup merge of #143380 - cjgillot:kw_span, r=compiler-errors 2025-07-04 05:47:27 +02:00
rustc_ast_pretty Remove support for dyn* 2025-07-01 19:00:21 +00:00
rustc_attr_data_structures Port #[non_exhaustive] to the new attribute parsing infrastructure 2025-07-04 20:30:42 +02:00
rustc_attr_parsing Port #[non_exhaustive] to the new attribute parsing infrastructure 2025-07-04 20:30:42 +02:00
rustc_baked_icu_data Add unreachable_pub to RUSTC_LINT_FLAGS for compiler/ crates. 2025-03-11 13:14:21 +11:00
rustc_borrowck Auto merge of #143036 - compiler-errors:no-dyn-star, r=oli-obk 2025-07-01 21:50:21 +00:00
rustc_builtin_macros Rollup merge of #143380 - cjgillot:kw_span, r=compiler-errors 2025-07-04 05:47:27 +02:00
rustc_codegen_cranelift Make __rust_alloc_error_handler_should_panic a function 2025-07-03 10:52:21 -07:00
rustc_codegen_gcc Make __rust_alloc_error_handler_should_panic a function 2025-07-03 10:52:21 -07:00
rustc_codegen_llvm Rollup merge of #143387 - dpaoliello:shouldpanicfn, r=bjorn3 2025-07-04 16:22:36 +02:00
rustc_codegen_ssa Allow all MIR Aggregates to take the operand path (if layout permits) 2025-07-03 22:53:19 -07:00
rustc_const_eval Rollup merge of #142876 - JonathanBrouwer:target_feature_parser, r=oli-obk 2025-07-03 13:29:36 +02:00
rustc_data_structures Rollup merge of #143406 - scottmcm:did-we-need-that-unsafe, r=compiler-errors 2025-07-05 00:12:10 +02:00
rustc_driver Remove recursion_limit increases. 2025-04-02 16:25:27 +11:00
rustc_driver_impl Rollup merge of #143019 - danielframpton:codegen-backend-parse, r=bjorn3 2025-06-30 20:49:40 +02:00
rustc_error_codes compiler: Trim the misleading C of C-cmse from errors 2025-06-25 00:52:10 -07:00
rustc_error_messages Remove unused feature gates 2025-06-28 23:36:46 +00:00
rustc_errors Rollup merge of #143417 - klensy:termize, r=jieyouxu 2025-07-04 16:22:37 +02:00
rustc_expand Rollup merge of #143408 - joshtriplett:fix-mbe-parser, r=compiler-errors 2025-07-05 00:12:11 +02:00
rustc_feature Auto merge of #143214 - camsteffen:remove-let-chains-feature, r=est31 2025-07-02 17:18:47 +00:00
rustc_fluent_macro Remove all unused feature gates from the compiler 2025-06-08 14:50:42 +00:00
rustc_fs_util Retry if creating temp fails with access denied 2025-04-25 11:28:36 +00:00
rustc_graphviz Remove #![warn(unreachable_pub)] from all compiler/ crates. 2025-03-11 13:14:21 +11:00
rustc_hashes Revert "Use workspace lints for crates in compiler/ #138084" 2025-03-10 18:12:47 +08:00
rustc_hir Remove PointerLike trait 2025-07-03 20:03:49 +00:00
rustc_hir_analysis Port #[non_exhaustive] to the new attribute parsing infrastructure 2025-07-04 20:30:42 +02:00
rustc_hir_pretty Remove support for dyn* 2025-07-01 19:00:21 +00:00
rustc_hir_typeck Rollup merge of #143394 - workingjubilee:reorganize-hir-analysis-provide-fn, r=compiler-errors 2025-07-04 05:47:28 +02:00
rustc_incremental Auto merge of #139758 - Zoxc:thread-local-graph, r=oli-obk 2025-05-07 12:39:54 +00:00
rustc_index index: add method for checking range on DenseBitSet 2025-06-04 00:47:12 +02:00
rustc_index_macros In rustc_mir_tranform, iterate over index newtypes instead of ints 2025-04-12 11:53:07 +00:00
rustc_infer Update cfg(bootstrap) 2025-07-01 10:55:49 -07:00
rustc_interface Save metadata among work products. 2025-07-04 14:02:17 +00:00
rustc_lexer setup CI and tidy to use typos for spellchecking and fix few typos 2025-07-03 10:51:06 +03:00
rustc_lint Port #[rustc_pass_by_value] to the new attribute system 2025-07-04 00:07:56 +03:00
rustc_lint_defs setup CI and tidy to use typos for spellchecking and fix few typos 2025-07-03 10:51:06 +03:00
rustc_llvm rustc_llvm: add Windows system libs only when cross-compiling from Windows 2025-05-31 15:47:14 +02:00
rustc_log Add documentation for init_logger_with_additional_layer 2025-06-12 12:11:15 +02:00
rustc_macros Rollup merge of #134006 - klensy:typos, r=nnethercote 2025-07-03 13:29:35 +02:00
rustc_metadata Add comment and move assertion. 2025-07-04 14:02:18 +00:00
rustc_middle Rollup merge of #143372 - cjgillot:bare-glob-map, r=petrochenkov 2025-07-05 00:12:09 +02:00
rustc_mir_build treat box patterns as deref patterns in THIR and usefulness analysis 2025-07-04 01:28:35 -07:00
rustc_mir_dataflow mir: Use the new method for BasicBlockData 2025-06-29 20:39:13 +08:00
rustc_mir_transform Auto merge of #142890 - kornelski:unused-var-debug, r=saethlin 2025-07-03 23:17:03 +00:00
rustc_monomorphize setup CI and tidy to use typos for spellchecking and fix few typos 2025-07-03 10:51:06 +03:00
rustc_next_trait_solver setup CI and tidy to use typos for spellchecking and fix few typos 2025-07-03 10:51:06 +03:00
rustc_parse Port #[non_exhaustive] to the new attribute parsing infrastructure 2025-07-04 20:30:42 +02:00
rustc_parse_format update to literal-escaper 0.0.4 for better API without unreachable and faster string parsing 2025-06-23 06:36:22 +00:00
rustc_passes Port #[non_exhaustive] to the new attribute parsing infrastructure 2025-07-04 20:30:42 +02:00
rustc_pattern_analysis treat box patterns as deref patterns in THIR and usefulness analysis 2025-07-04 01:28:35 -07:00
rustc_privacy Reorder fields in hir::ItemKind variants. 2025-05-30 02:23:20 +10:00
rustc_proc_macro update to literal-escaper 0.0.4 for better API without unreachable and faster string parsing 2025-06-23 06:36:22 +00:00
rustc_query_impl Reuse metadata file from work products. 2025-07-04 14:02:17 +00:00
rustc_query_system setup CI and tidy to use typos for spellchecking and fix few typos 2025-07-03 10:51:06 +03:00
rustc_resolve Port #[non_exhaustive] to the new attribute parsing infrastructure 2025-07-04 20:30:42 +02:00
rustc_sanitizers Remove support for dyn* 2025-07-01 19:00:21 +00:00
rustc_serialize setup CI and tidy to use typos for spellchecking and fix few typos 2025-07-03 10:51:06 +03:00
rustc_session Rollup merge of #143417 - klensy:termize, r=jieyouxu 2025-07-04 16:22:37 +02:00
rustc_smir refactor: implement a new bridge trait Allocation 2025-07-04 01:57:47 +00:00
rustc_span Remove PointerLike trait 2025-07-03 20:03:49 +00:00
rustc_symbol_mangling Remove support for dyn* 2025-07-01 19:00:21 +00:00
rustc_target Rollup merge of #134006 - klensy:typos, r=nnethercote 2025-07-03 13:29:35 +02:00
rustc_thread_pool Apply suggestions from code review 2025-06-16 12:27:47 -07:00
rustc_trait_selection Rollup merge of #143308 - compiler-errors:no-pointer-like, r=oli-obk 2025-07-04 16:22:35 +02:00
rustc_traits Remove fast path from codegen_select, since Sized has no methods 2025-07-02 00:33:06 +00:00
rustc_transmute tag_for_variant: properly pass TypingEnv 2025-06-27 17:04:33 +02:00
rustc_ty_utils Rollup merge of #134006 - klensy:typos, r=nnethercote 2025-07-03 13:29:35 +02:00
rustc_type_ir setup CI and tidy to use typos for spellchecking and fix few typos 2025-07-03 10:51:06 +03:00
rustc_type_ir_macros Split TypeFolder and FallibleTypeFolder 2025-04-15 18:30:35 +00:00
stable_mir Change rustc_driver dependency on stable_mir crate 2025-04-30 15:39:52 -07:00