Implement benchmarks for uN::{gather,scatter}_bits #149610
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Rollup of 10 pull requests Successful merges: - #149521 (Improve `io::Error::downcast`) - #149544 (Only apply `no_mangle_const_items`'s suggestion to plain const items) - #149545 (fix the check for which expressions read never type) - #149570 (rename cortex-ar references to unified aarch32) - #149574 (Batched compiletest Config fixups) - #149579 (Motor OS: fix compile error) - #149595 (Tidying up `tests/ui/issues` tests [2/N]) - #149597 (Revert "implement and test `Iterator::{exactly_one, collect_array}`") - #149608 (Allow PowerPC spe_acc as clobber-only register) - #149610 (Implement benchmarks for uN::{gather,scatter}_bits) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup merge of #149610 - quaternic:gather-scatter-bits-bench, r=Mark-Simulacrum Implement benchmarks for uN::{gather,scatter}_bits Feature gate: #![feature(uint_gather_scatter_bits)] Tracking issue: #149069 Accepted ACP: rust-lang/libs-team#695 (comment) For each method, there are three benchmarks, which differ in that the mask (second) argument is one of: - constant at compile time - runtime value but invariant for the measured loop - different for each call Sample output ```text num::int_bits::u32::constant::gather_bits 555.82ns/iter +/- 22.41 num::int_bits::u32::constant::scatter_bits 545.45ns/iter +/- 124.26 num::int_bits::u32::invariant::gather_bits 8178.86ns/iter +/- 217.37 num::int_bits::u32::invariant::scatter_bits 7135.95ns/iter +/- 214.51 num::int_bits::u32::variable::gather_bits 10539.29ns/iter +/- 198.90 num::int_bits::u32::variable::scatter_bits 9671.26ns/iter +/- 254.88 ``` (and similarly for the other `uN` types)
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Feature gate: #![feature(uint_gather_scatter_bits)]
Tracking issue: #149069
Accepted ACP: rust-lang/libs-team#695 (comment)
For each method, there are three benchmarks, which differ in that the mask (second) argument is one of:
Sample output
(and similarly for the other
uNtypes)