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Minor cleanup

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This commit is contained in:
Chase Wilson 2021-12-14 13:40:16 -06:00
parent 2b46c7c906
commit 2af02abd93
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GPG Key ID: 65D05E5367092801
2 changed files with 7 additions and 7 deletions
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8
compiler/rustc_middle/src/ty/layout.rs
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@ -347,10 +347,6 @@ impl<'tcx> LayoutCx<'tcx, TyCtxt<'tcx>> {
let mut inverse_memory_index: Vec<u32> = (0..fields.len() as u32).collect(); let mut inverse_memory_index: Vec<u32> = (0..fields.len() as u32).collect();
// `ReprOptions.layout_seed` is a deterministic seed that we can use to
// randomize field ordering with
let mut rng = Xoshiro128StarStar::seed_from_u64(repr.field_shuffle_seed);
let optimize = !repr.inhibit_struct_field_reordering_opt(); let optimize = !repr.inhibit_struct_field_reordering_opt();
if optimize { if optimize {
let end = let end =
@ -364,6 +360,10 @@ impl<'tcx> LayoutCx<'tcx, TyCtxt<'tcx>> {
// the field ordering to try and catch some code making assumptions about layouts // the field ordering to try and catch some code making assumptions about layouts
// we don't guarantee // we don't guarantee
if repr.can_randomize_type_layout() { if repr.can_randomize_type_layout() {
// `ReprOptions.layout_seed` is a deterministic seed that we can use to
// randomize field ordering with
let mut rng = Xoshiro128StarStar::seed_from_u64(repr.field_shuffle_seed);
// Shuffle the ordering of the fields // Shuffle the ordering of the fields
optimizing.shuffle(&mut rng); optimizing.shuffle(&mut rng);

6
compiler/rustc_middle/src/ty/mod.rs
View File

@ -1608,9 +1608,9 @@ bitflags! {
// the seed stored in `ReprOptions.layout_seed` // the seed stored in `ReprOptions.layout_seed`
const RANDOMIZE_LAYOUT = 1 << 5; const RANDOMIZE_LAYOUT = 1 << 5;
// Any of these flags being set prevent field reordering optimisation. // Any of these flags being set prevent field reordering optimisation.
const IS_UNOPTIMISABLE = ReprFlags::IS_C.bits | const IS_UNOPTIMISABLE = ReprFlags::IS_C.bits
ReprFlags::IS_SIMD.bits | | ReprFlags::IS_SIMD.bits
ReprFlags::IS_LINEAR.bits; | ReprFlags::IS_LINEAR.bits;
} }
} }