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Replace SingleUseConsts by GVN. #147079

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@cjgillot cjgillot commented Sep 26, 2025

r? @ghost

@rustbot rustbot added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Sep 26, 2025
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@bors try @rust-timer queue

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rust-bors bot added a commit that referenced this pull request Sep 26, 2025
@rustbot rustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Sep 26, 2025

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rust-bors bot commented Sep 26, 2025

☀️ Try build successful (CI)
Build commit: 70aac37 (70aac379929263ba1dd1d7cb6838e7e6b58c5d2b, parent: 54a8a1db604e4caff93e26e167ad4a6fde9f0681)

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Finished benchmarking commit (70aac37): comparison URL.

Overall result: ❌✅ regressions and improvements - please read the text below

Benchmarking this pull request means it may be perf-sensitive – we'll automatically label it not fit for rolling up. You can override this, but we strongly advise not to, due to possible changes in compiler perf.

Next Steps: If you can justify the regressions found in this try perf run, please do so in sufficient writing along with @rustbot label: +perf-regression-triaged. If not, please fix the regressions and do another perf run. If its results are neutral or positive, the label will be automatically removed.

@bors rollup=never
@rustbot label: -S-waiting-on-perf +perf-regression

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

mean range count
Regressions ❌
(primary)		 0.7% [0.1%, 2.9%] 18
Regressions ❌
(secondary)		 0.1% [0.1%, 0.1%] 2
Improvements ✅
(primary)		 -0.3% [-0.6%, -0.2%] 15
Improvements ✅
(secondary)		 -0.2% [-0.3%, -0.1%] 4
All ❌✅ (primary) 0.3% [-0.6%, 2.9%] 33

Max RSS (memory usage)

Results (primary -0.9%, secondary 4.1%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

mean range count
Regressions ❌
(primary)		 1.9% [1.0%, 2.9%] 5
Regressions ❌
(secondary)		 4.1% [0.7%, 5.0%] 8
Improvements ✅
(primary)		 -3.3% [-5.4%, -1.0%] 6
Improvements ✅
(secondary)		 - - 0
All ❌✅ (primary) -0.9% [-5.4%, 2.9%] 11

Cycles

Results (primary -1.9%, secondary -5.2%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

mean range count
Regressions ❌
(primary)		 2.9% [2.9%, 2.9%] 1
Regressions ❌
(secondary)		 2.2% [2.0%, 2.4%] 2
Improvements ✅
(primary)		 -3.5% [-3.8%, -3.2%] 3
Improvements ✅
(secondary)		 -6.2% [-10.6%, -2.4%] 15
All ❌✅ (primary) -1.9% [-3.8%, 2.9%] 4

Binary size

Results (primary -0.1%, secondary -0.0%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

mean range count
Regressions ❌
(primary)		 0.2% [0.0%, 1.5%] 38
Regressions ❌
(secondary)		 0.1% [0.0%, 0.6%] 28
Improvements ✅
(primary)		 -0.3% [-0.7%, -0.0%] 70
Improvements ✅
(secondary)		 -0.2% [-0.7%, -0.0%] 27
All ❌✅ (primary) -0.1% [-0.7%, 1.5%] 108

Bootstrap: 471.437s -> 470.824s (-0.13%)
Artifact size: 388.14 MiB -> 388.43 MiB (0.08%)

@rustbot rustbot added perf-regression Performance regression. and removed S-waiting-on-perf Status: Waiting on a perf run to be completed. labels Sep 27, 2025

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The job aarch64-gnu-llvm-20-1 failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot) 
failures:
---- [ui] tests/ui-fulldeps/rustc_public/check_allocation.rs stdout ----
error: test did not exit with success! code=Some(101) so test would pass with `run-fail`
status: exit status: 101
command: cd "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui-fulldeps/rustc_public/check_allocation" && RUSTC="/checkout/obj/build/aarch64-unknown-linux-gnu/stage2/bin/rustc" RUST_TEST_THREADS="4" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui-fulldeps/rustc_public/check_allocation/a"
stdout: none
--- stderr -------------------------------
warning: static `C_STR` is never used
##[warning] --> alloc_input.rs:9:12
 |
9 | static C_STR: &std::ffi::CStr = c"cstr";
 | ^^^^^
 |
 = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
---
 0: __rustc::rust_begin_unwind
 1: core::panicking::panic_fmt
 2: core::panicking::assert_failed_inner
 3: core::panicking::assert_failed
 4: check_allocation::test_stable_mir
 5: <check_allocation::main::RustcPublic<B,C,F> as rustc_driver_impl::Callbacks>::after_analysis
 6: <std::thread::local::LocalKey<core::cell::Cell<*const ()>>>::with::<rustc_middle::ty::context::tls::enter_context<<rustc_middle::ty::context::GlobalCtxt>::enter<rustc_interface::passes::create_and_enter_global_ctxt<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure#2}>::{closure#2}::{closure#0}, core::option::Option<rustc_interface::queries::Linker>>::{closure#1}, core::option::Option<rustc_interface::queries::Linker>>::{closure#0}, core::option::Option<rustc_interface::queries::Linker>>
 7: <rustc_middle::ty::context::TyCtxt>::create_global_ctxt::<core::option::Option<rustc_interface::queries::Linker>, rustc_interface::passes::create_and_enter_global_ctxt<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure#2}>::{closure#2}::{closure#0}>
 8: <rustc_interface::passes::create_and_enter_global_ctxt<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure#2}>::{closure#2} as core::ops::function::FnOnce<(&rustc_session::session::Session, rustc_middle::ty::context::CurrentGcx, alloc::sync::Arc<rustc_data_structures::jobserver::Proxy>, &std::sync::once_lock::OnceLock<rustc_middle::ty::context::GlobalCtxt>, &rustc_data_structures::sync::worker_local::WorkerLocal<rustc_middle::arena::Arena>, &rustc_data_structures::sync::worker_local::WorkerLocal<rustc_hir::Arena>, rustc_driver_impl::run_compiler::{closure#0}::{closure#2})>>::call_once::{shim:vtable#0}
 9: <alloc::boxed::Box<dyn for<'a> core::ops::function::FnOnce<(&'a rustc_session::session::Session, rustc_middle::ty::context::CurrentGcx, alloc::sync::Arc<rustc_data_structures::jobserver::Proxy>, &'a std::sync::once_lock::OnceLock<rustc_middle::ty::context::GlobalCtxt<'a>>, &'a rustc_data_structures::sync::worker_local::WorkerLocal<rustc_middle::arena::Arena<'a>>, &'a rustc_data_structures::sync::worker_local::WorkerLocal<rustc_hir::Arena<'a>>, rustc_driver_impl::run_compiler::{closure#0}::{closure#2}), Output = core::option::Option<rustc_interface::queries::Linker>>> as core::ops::function::FnOnce<(&rustc_session::session::Session, rustc_middle::ty::context::CurrentGcx, alloc::sync::Arc<rustc_data_structures::jobserver::Proxy>, &std::sync::once_lock::OnceLock<rustc_middle::ty::context::GlobalCtxt>, &rustc_data_structures::sync::worker_local::WorkerLocal<rustc_middle::arena::Arena>, &rustc_data_structures::sync::worker_local::WorkerLocal<rustc_hir::Arena>, rustc_driver_impl::run_compiler::{closure#0}::{closure#2})>>::call_once
 10: rustc_interface::passes::create_and_enter_global_ctxt::<core::option::Option<rustc_interface::queries::Linker>, rustc_driver_impl::run_compiler::{closure#0}::{closure#2}>
 11: <scoped_tls::ScopedKey<rustc_span::SessionGlobals>>::set::<rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}::{closure#0}, ()>
 12: rustc_span::create_session_globals_then::<(), rustc_interface::util::run_in_thread_with_globals<rustc_interface::util::run_in_thread_pool_with_globals<rustc_interface::interface::run_compiler<(), rustc_driver_impl::run_compiler::{closure#0}>::{closure#1}, ()>::{closure#0}, ()>::{closure#0}::{closure#0}::{closure#0}>
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
warning: 1 warning emitted

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