Key active queries by usize rather than storing raw keys

[Mark-Simulacrum]

Starting with perf run to evaluate impact -- my hope is that this helps somewhat with rustc compile times, since it should allow de-duplicating a bunch of HashTable<K, ...> codegen since it's now ~always HashTable<usize, ...> -- more can be done by merging the DefaultCache's active + non-active maps too.

Locally I don't really see any win from this though, so it's possible it's wasted effort -- want to see what perf says about it.

r? ghost

[Mark-Simulacrum]

@bors2 try @rust-timer queue

[rust-bors]

⌛ Trying commit ebd893a with merge 93ff34b…

To cancel the try build, run the command @bors2 try cancel.

[rust-log-analyzer]

The job x86_64-gnu-llvm-19 failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

#19 exporting to docker image format
#19 sending tarball 27.5s done
#19 DONE 35.0s
##[endgroup]
Setting extra environment values for docker:  --env ENABLE_GCC_CODEGEN=1 --env GCC_EXEC_PREFIX=/usr/lib/gcc/
[CI_JOB_NAME=x86_64-gnu-llvm-19]
[CI_JOB_NAME=x86_64-gnu-llvm-19]
debug: `DISABLE_CI_RUSTC_IF_INCOMPATIBLE` configured.
---
sccache: Listening on address 127.0.0.1:4226
##[group]Configure the build
configure: processing command line
configure: 
configure: build.configure-args := ['--build=x86_64-unknown-linux-gnu', '--llvm-root=/usr/lib/llvm-19', '--enable-llvm-link-shared', '--set', 'rust.randomize-layout=true', '--set', 'rust.thin-lto-import-instr-limit=10', '--set', 'build.print-step-timings', '--enable-verbose-tests', '--set', 'build.metrics', '--enable-verbose-configure', '--enable-sccache', '--disable-manage-submodules', '--enable-locked-deps', '--enable-cargo-native-static', '--set', 'rust.codegen-units-std=1', '--set', 'dist.compression-profile=balanced', '--dist-compression-formats=xz', '--set', 'rust.lld=false', '--disable-dist-src', '--release-channel=nightly', '--enable-debug-assertions', '--enable-overflow-checks', '--enable-llvm-assertions', '--set', 'rust.verify-llvm-ir', '--set', 'rust.codegen-backends=llvm,cranelift,gcc', '--set', 'llvm.static-libstdcpp', '--set', 'gcc.download-ci-gcc=true', '--enable-new-symbol-mangling']
configure: build.build          := x86_64-unknown-linux-gnu
configure: target.x86_64-unknown-linux-gnu.llvm-config := /usr/lib/llvm-19/bin/llvm-config
configure: llvm.link-shared     := True
configure: rust.randomize-layout := True
configure: rust.thin-lto-import-instr-limit := 10

[rust-bors]

☀️ Try build successful (CI)
Build commit: 93ff34b (93ff34b07bb0247a95e138d0468874536d5aab1e)

[rust-timer]

Finished benchmarking commit (93ff34b): comparison URL.

Overall result: ❌ regressions - BENCHMARK(S) FAILED

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

❗ ❗ ❗ ❗ ❗
Warning ⚠️: The following benchmark(s) failed to build:

• serde-1.0.219-threads4

❗ ❗ ❗ ❗ ❗

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%, 4.6%]	66
Regressions ❌ (secondary)	2.0%	[0.1%, 4.7%]	43
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.8%	[-0.9%, -0.5%]	3
All ❌✅ (primary)	0.7%	[0.1%, 4.6%]	66

Max RSS (memory usage)

Results (primary 1.2%, secondary 1.6%)

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

	mean	range	count
Regressions ❌ (primary)	1.2%	[1.0%, 1.4%]	3
Regressions ❌ (secondary)	2.2%	[1.3%, 3.2%]	7
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.5%	[-2.5%, -2.5%]	1
All ❌✅ (primary)	1.2%	[1.0%, 1.4%]	3

Cycles

Results (primary 2.7%, 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)	2.7%	[1.0%, 5.0%]	14
Regressions ❌ (secondary)	4.5%	[2.0%, 7.7%]	20
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-4.3%	[-4.3%, -4.3%]	1
All ❌✅ (primary)	2.7%	[1.0%, 5.0%]	14

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 755.17s -> 752.359s (-0.37%)
Artifact size: 372.30 MiB -> 371.93 MiB (-0.10%)