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Auto merge of #94130 - erikdesjardins:partially, r=nikic

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Use undef for (some) partially-uninit constants

There needs to be some limit to avoid perf regressions on large arrays
with undef in each element (see comment in the code).

Fixes: #84565
Original PR: #83698

Depends on LLVM 14: #93577
This commit is contained in:
bors 2022-02-25 05:44:33 +00:00
commit ece55d416e
7 changed files with 44 additions and 66 deletions
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6
compiler/rustc_session/src/options.rs
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@ -1336,9 +1336,6 @@ 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],
"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)"),
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],
@ -1483,6 +1480,9 @@ options! {
"in diagnostics, use heuristics to shorten paths referring to items"),
ui_testing: bool = (false, parse_bool, [UNTRACKED],
"emit compiler diagnostics in a form suitable for UI testing (default: no)"),
uninit_const_chunk_threshold: usize = (16, parse_number, [TRACKED],
"allow generating const initializers with mixed init/uninit chunks, \
and set the maximum number of chunks for which this is allowed (default: 16)"),
unleash_the_miri_inside_of_you: bool = (false, parse_bool, [TRACKED],
"take the brakes off const evaluation. NOTE: this is unsound (default: no)"),
unpretty: Option<String> = (None, parse_unpretty, [UNTRACKED],