Stuart Cook 44ffe1023c Rollup merge of #144764 - scottmcm:tweak-impossible-discriminant-assume, r=WaffleLapkin ... [codegen] assume the tag, not the relative discriminant Address the issue mentioned in <https://github.com/llvm/llvm-project/issues/134024#issuecomment-3131782555> by changing discriminant calculation to `assume` on the originally-loaded `tag`, rather than on `cast(tag)-OFFSET`. The previous way does make the *purpose* of the assume clearer, IMHO, since you see `assume(x != 4); if p { x } else { 4 }`, but doing it this way instead means that the `add`s optimize away in LLVM21, which is more important. And this new way is still easily thought of as being like metadata on the load saying specifically which value is impossible. Demo of the LLVM20 vs LLVM21 difference: <https://llvm.godbolt.org/z/n54x5Mq1T> r? ``@nikic``		2025-08-08 12:52:50 +10:00
..
rustc	rename stable_mir to rustc_public, and rustc_smir to rustc_public_bridge	2025-07-14 09:25:54 +00:00
rustc_abi	Reuse sign_extend helper	2025-07-29 14:17:48 +00:00
rustc_arena	Introduce Arena::try_alloc_from_iter.	2025-04-19 01:13:18 +00:00
rustc_ast	Deduplicate IntTy/UintTy/FloatTy.	2025-07-31 19:56:11 +10:00
rustc_ast_ir	Tidy up Cargo.toml files.	2025-07-31 19:58:04 +10:00
rustc_ast_lowering	Port #[coroutine] to the new attribute system	2025-08-04 18:37:40 +02:00
rustc_ast_passes	Rollup merge of #137831 - estebank:auto-trait-err, r=compiler-errors	2025-08-07 20:49:36 +10:00
rustc_ast_pretty	use let chains in ast, borrowck, codegen, const_eval	2025-07-28 06:08:48 +05:00
rustc_attr_parsing	Rollup merge of #143808 - JonathanBrouwer:should_panic_parser, r=jdonszelmann	2025-08-07 20:49:40 +10:00
rustc_baked_icu_data	Add unreachable_pub to RUSTC_LINT_FLAGS for compiler/ crates.	2025-03-11 13:14:21 +11:00
rustc_borrowck	Rollup merge of #144917 - compiler-errors:tail-call-linked-lifetimes, r=lcnr	2025-08-06 21:29:29 +02:00
rustc_builtin_macros	Port #[should_panic] to the new attribute parsing infrastructure	2025-08-06 21:37:51 +02:00
rustc_codegen_cranelift	Update codegen_{cranelift,gcc} and opt-dist to use build.compiletest-allow-stage0	2025-07-30 19:55:07 +08:00
rustc_codegen_gcc	Revert "Preserve the .debug_gdb_scripts section"	2025-08-06 18:01:07 +00:00
rustc_codegen_llvm	Auto merge of #145043 - Zalathar:rollup-3dbvdrm, r=Zalathar	2025-08-07 14:01:43 +00:00
rustc_codegen_ssa	Rollup merge of #144764 - scottmcm:tweak-impossible-discriminant-assume, r=WaffleLapkin	2025-08-08 12:52:50 +10:00
rustc_const_eval	Rollup merge of #145033 - nnethercote:fix-144994, r=fmease	2025-08-07 20:49:48 +10:00
rustc_data_structures	Allow pretty printing paths with -Zself-profile-events=args	2025-07-25 22:24:21 +02:00
rustc_driver	Remove recursion_limit increases.	2025-04-02 16:25:27 +11:00
rustc_driver_impl	Tidy up Cargo.toml files.	2025-07-31 19:58:04 +10:00
rustc_error_codes	Update E0562 to account for the new impl trait positions	2025-08-02 11:29:04 +02:00
rustc_error_messages	Remove unused feature gates	2025-06-28 23:36:46 +00:00
rustc_errors	Rollup merge of #144691 - xizheyin:suggest-confuse, r=estebank	2025-08-01 00:38:20 -04:00
rustc_expand	Auto merge of #129183 - estebank:cfg-visitor, r=davidtwco	2025-08-02 05:09:31 +00:00
rustc_feature	Auto merge of #145043 - Zalathar:rollup-3dbvdrm, r=Zalathar	2025-08-07 14:01:43 +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	Rollup merge of #143808 - JonathanBrouwer:should_panic_parser, r=jdonszelmann	2025-08-07 20:49:40 +10:00
rustc_hir_analysis	Fortify generic param default checks	2025-08-06 01:26:26 +02:00
rustc_hir_pretty	remove rustc_attr_data_structures	2025-07-31 14:19:27 +02:00
rustc_hir_typeck	Rollup merge of #144694 - compiler-errors:with-self-ty, r=SparrowLii	2025-08-04 14:58:09 +10:00
rustc_incremental	Auto merge of #139758 - Zoxc:thread-local-graph, r=oli-obk	2025-05-07 12:39:54 +00:00
rustc_index	Tidy up Cargo.toml files.	2025-07-31 19:58:04 +10:00
rustc_index_macros	Tidy up Cargo.toml files.	2025-07-31 19:58:04 +10:00
rustc_infer	Auto merge of #144677 - nnethercote:bound-const-handling, r=lcnr	2025-08-03 05:26:43 +00:00
rustc_interface	coverage: Remove -Zcoverage-options=no-mir-spans	2025-08-04 13:48:40 +10:00
rustc_lexer	test(lexer): Add frontmatter unit test	2025-07-10 10:25:29 -05:00
rustc_lint	Rollup merge of #144601 - kornelski:cargo-fix-mismatched_lifetime_syntaxes, r=petrochenkov	2025-08-07 20:49:45 +10:00
rustc_lint_defs	Rollup merge of #144369 - joshtriplett:mbe-expr-semi-deny-by-default, r=petrochenkov	2025-08-07 20:49:43 +10:00
rustc_llvm	Rollup merge of #144712 - nnethercote:dedup-num-types, r=fmease	2025-07-31 17:19:39 +02:00
rustc_log	Add documentation for init_logger_with_additional_layer	2025-06-12 12:11:15 +02:00
rustc_macros	remove rustc_attr_data_structures	2025-07-31 14:19:27 +02:00
rustc_metadata	remove rustc_attr_data_structures	2025-07-31 14:19:27 +02:00
rustc_middle	Rollup merge of #144998 - dianqk:visit-no-use-proj, r=cjgillot	2025-08-06 21:29:34 +02:00
rustc_mir_build	Rollup merge of #143764 - dianne:primary-binding-drop-order, r=Nadrieril,traviscross	2025-08-07 20:49:39 +10:00
rustc_mir_dataflow	Rollup merge of #144478 - joshtriplett:doc-code-formatting-prep, r=Amanieu	2025-08-02 11:24:24 +02:00
rustc_mir_transform	Rollup merge of #144996 - dianqk:simplifycfg-collapse_goto_chain-changed, r=cjgillot	2025-08-06 21:29:33 +02:00
rustc_monomorphize	remove rustc_attr_data_structures	2025-07-31 14:19:27 +02:00
rustc_next_trait_solver	we only merge candidates for trait and normalizes-to goals	2025-08-05 14:57:37 +02:00
rustc_parse	Rollup merge of #144956 - fmease:gate-const-trait-syntax, r=BoxyUwU	2025-08-06 21:29:30 +02:00
rustc_parse_format	update to literal-escaper-0.0.5	2025-07-08 10:16:44 +00:00
rustc_passes	Rollup merge of #143808 - JonathanBrouwer:should_panic_parser, r=jdonszelmann	2025-08-07 20:49:40 +10:00
rustc_pattern_analysis	Tidy up Cargo.toml files.	2025-07-31 19:58:04 +10:00
rustc_privacy	Auto merge of #144554 - cjgillot:no-hir-eff-vis, r=petrochenkov	2025-08-02 09:23:36 +00:00
rustc_proc_macro	Tidy up Cargo.toml files.	2025-07-31 19:58:04 +10:00
rustc_public	Tidy up Cargo.toml files.	2025-07-31 19:58:04 +10:00
rustc_public_bridge	Remove useless lifetime parameter.	2025-07-23 23:54:37 +00:00
rustc_query_impl	Remove unused allow attrs	2025-07-07 12:58:16 +00:00
rustc_query_system	remove rustc_attr_data_structures	2025-07-31 14:19:27 +02:00
rustc_resolve	Introduce ModernIdent type to unify macro 2.0 hygiene handling	2025-08-06 21:19:09 +08:00
rustc_sanitizers	Tidy up Cargo.toml files.	2025-07-31 19:58:04 +10:00
rustc_serialize	use div_ceil instead of manual logic	2025-07-05 10:55:42 +02:00
rustc_session	coverage: Simplify access to debug/testing -Zcoverage-options flags	2025-08-04 13:48:41 +10:00
rustc_span	Rollup merge of #144439 - xizheyin:symbol-rs, r=petrochenkov	2025-08-07 20:49:44 +10:00
rustc_symbol_mangling	Reimplement print_region in type_name.rs.	2025-08-07 12:46:33 +10:00
rustc_target	Rollup merge of #138689 - jedbrown:jed/nvptx-target-feature, r=ZuseZ4	2025-08-07 20:49:36 +10:00
rustc_thread_pool	Drop rust-version from rustc_thread_pool	2025-08-04 15:03:49 -07:00
rustc_trait_selection	Rollup merge of #144776 - nnethercote:Printer-cleanups, r=cjgillot	2025-08-05 03:51:34 +02:00
rustc_traits	Auto merge of #144446 - nnethercote:opt-region-constraints, r=lcnr	2025-08-01 04:06:21 +00:00
rustc_transmute	Tidy up Cargo.toml files.	2025-07-31 19:58:04 +10:00
rustc_ty_utils	Extract borrowck coroutine drop-liveness hack	2025-07-31 17:38:28 +00:00
rustc_type_ir	Rollup merge of #144694 - compiler-errors:with-self-ty, r=SparrowLii	2025-08-04 14:58:09 +10:00
rustc_type_ir_macros	Split TypeFolder and FallibleTypeFolder	2025-04-15 18:30:35 +00:00