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Auto merge of #108020 - nnethercote:opt-mk_region, r=compiler-errors

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Optimize `mk_region`

PR #107869 avoiding some interning under `mk_ty` by special-casing `Ty` variants with simple (integer) bodies. This PR does something similar for regions.

r? `@compiler-errors`
This commit is contained in:
bors 2023-02-16 16:11:54 +00:00
commit c5d1b3ea96
40 changed files with 254 additions and 186 deletions
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7
compiler/rustc_mir_transform/src/large_enums.rs
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@ -3,7 +3,7 @@ use crate::MirPass;
use rustc_data_structures::fx::FxHashMap;
use rustc_middle::mir::interpret::AllocId;
use rustc_middle::mir::*;
use rustc_middle::ty::{self, AdtDef, Const, ParamEnv, Ty, TyCtxt};
use rustc_middle::ty::{self, AdtDef, ParamEnv, Ty, TyCtxt};
use rustc_session::Session;
use rustc_target::abi::{HasDataLayout, Size, TagEncoding, Variants};
@ -141,10 +141,7 @@ impl EnumSizeOpt {
self.candidate(tcx, param_env, ty, &mut alloc_cache)?;
let alloc = tcx.global_alloc(alloc_id).unwrap_memory();
let tmp_ty = tcx.mk_ty(ty::Array(
tcx.types.usize,
Const::from_target_usize(tcx, num_variants as u64),
));
let tmp_ty = tcx.mk_array(tcx.types.usize, num_variants as u64);
let size_array_local = local_decls.push(LocalDecl::new(tmp_ty, span));
let store_live = Statement {