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Use undef for partially-uninit constants up to 1024 bytes

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There needs to be some limit to avoid perf regressions on large arrays
with undef in each element (see comment in the code).
This commit is contained in:
Erik Desjardins 2022-02-18 15:57:10 -05:00
parent b8c56fa8c3
commit b7e5597491
5 changed files with 23 additions and 43 deletions
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4
compiler/rustc_session/src/options.rs
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@ -1341,9 +1341,9 @@ options! {
"panic strategy for panics in drops"),
parse_only: bool = (false, parse_bool, [UNTRACKED],
"parse only; do not compile, assemble, or link (default: no)"),
partially_uninit_const_threshold: Option<usize> = (None, parse_opt_number, [TRACKED],
partially_uninit_const_threshold: Option<usize> = (Some(1024), parse_opt_number, [TRACKED],
"allow generating const initializers with mixed init/uninit bytes, \
and set the maximum total size of a const allocation for which this is allowed (default: never)"),
and set the maximum total size of a const allocation for which this is allowed (default: 1024 bytes)"),
perf_stats: bool = (false, parse_bool, [UNTRACKED],
"print some performance-related statistics (default: no)"),
pick_stable_methods_before_any_unstable: bool = (true, parse_bool, [TRACKED],