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Auto merge of #85158 - JulianKnodt:array_const_val, r=cjgillot

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Mir-Opt for copying enums with large discrepancies

I have been meaning to make this for quite a while, based off of this [hackmd](https://hackmd.io/`@ft4bxUsFT5CEUBmRKYHr7w/rJM8BBPzD).`

I'm not sure where to put this opt now that I've made it, so I'd appreciate suggestions on that!
It's also one long chain of statements, not sure if there's a more friendly format to make it.

r? `@tmiasko`
I would `r` oli but he's on leave so he suggested I `r` tmiasko or wesleywiser.
This commit is contained in:
bors 2023-02-10 21:49:31 +00:00
commit 5a8dfd933a
11 changed files with 789 additions and 0 deletions
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298
compiler/rustc_mir_transform/src/large_enums.rs Normal file
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@ -0,0 +1,298 @@
use crate::rustc_middle::ty::util::IntTypeExt;
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_session::Session;
use rustc_target::abi::{HasDataLayout, Size, TagEncoding, Variants};
/// A pass that seeks to optimize unnecessary moves of large enum types, if there is a large
/// enough discrepancy between them.
///
/// i.e. If there is are two variants:
/// ```
/// enum Example {
/// Small,
/// Large([u32; 1024]),
/// }
/// ```
/// Instead of emitting moves of the large variant,
/// Perform a memcpy instead.
/// Based off of [this HackMD](https://hackmd.io/@ft4bxUsFT5CEUBmRKYHr7w/rJM8BBPzD).
///
/// In summary, what this does is at runtime determine which enum variant is active,
/// and instead of copying all the bytes of the largest possible variant,
/// copy only the bytes for the currently active variant.
pub struct EnumSizeOpt {
pub(crate) discrepancy: u64,
}
impl<'tcx> MirPass<'tcx> for EnumSizeOpt {
fn is_enabled(&self, sess: &Session) -> bool {
sess.opts.unstable_opts.unsound_mir_opts || sess.mir_opt_level() >= 3
}
fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
// NOTE: This pass may produce different MIR based on the alignment of the target
// platform, but it will still be valid.
self.optim(tcx, body);
}
}
impl EnumSizeOpt {
fn candidate<'tcx>(
&self,
tcx: TyCtxt<'tcx>,
param_env: ParamEnv<'tcx>,
ty: Ty<'tcx>,
alloc_cache: &mut FxHashMap<Ty<'tcx>, AllocId>,
) -> Option<(AdtDef<'tcx>, usize, AllocId)> {
let adt_def = match ty.kind() {
ty::Adt(adt_def, _substs) if adt_def.is_enum() => adt_def,
_ => return None,
};
let layout = tcx.layout_of(param_env.and(ty)).ok()?;
let variants = match &layout.variants {
Variants::Single { .. } => return None,
Variants::Multiple { tag_encoding, .. }
if matches!(tag_encoding, TagEncoding::Niche { .. }) =>
{
return None;
}
Variants::Multiple { variants, .. } if variants.len() <= 1 => return None,
Variants::Multiple { variants, .. } => variants,
};
let min = variants.iter().map(|v| v.size).min().unwrap();
let max = variants.iter().map(|v| v.size).max().unwrap();
if max.bytes() - min.bytes() < self.discrepancy {
return None;
}
let num_discrs = adt_def.discriminants(tcx).count();
if variants.iter_enumerated().any(|(var_idx, _)| {
let discr_for_var = adt_def.discriminant_for_variant(tcx, var_idx).val;
(discr_for_var > usize::MAX as u128) || (discr_for_var as usize >= num_discrs)
}) {
return None;
}
if let Some(alloc_id) = alloc_cache.get(&ty) {
return Some((*adt_def, num_discrs, *alloc_id));
}
let data_layout = tcx.data_layout();
let ptr_sized_int = data_layout.ptr_sized_integer();
let target_bytes = ptr_sized_int.size().bytes() as usize;
let mut data = vec![0; target_bytes * num_discrs];
macro_rules! encode_store {
($curr_idx: expr, $endian: expr, $bytes: expr) => {
let bytes = match $endian {
rustc_target::abi::Endian::Little => $bytes.to_le_bytes(),
rustc_target::abi::Endian::Big => $bytes.to_be_bytes(),
};
for (i, b) in bytes.into_iter().enumerate() {
data[$curr_idx + i] = b;
}
};
}
for (var_idx, layout) in variants.iter_enumerated() {
let curr_idx =
target_bytes * adt_def.discriminant_for_variant(tcx, var_idx).val as usize;
let sz = layout.size;
match ptr_sized_int {
rustc_target::abi::Integer::I32 => {
encode_store!(curr_idx, data_layout.endian, sz.bytes() as u32);
}
rustc_target::abi::Integer::I64 => {
encode_store!(curr_idx, data_layout.endian, sz.bytes());
}
_ => unreachable!(),
};
}
let alloc = interpret::Allocation::from_bytes(
data,
tcx.data_layout.ptr_sized_integer().align(&tcx.data_layout).abi,
Mutability::Not,
);
let alloc = tcx.create_memory_alloc(tcx.intern_const_alloc(alloc));
Some((*adt_def, num_discrs, *alloc_cache.entry(ty).or_insert(alloc)))
}
fn optim<'tcx>(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
let mut alloc_cache = FxHashMap::default();
let body_did = body.source.def_id();
let param_env = tcx.param_env(body_did);
let blocks = body.basic_blocks.as_mut();
let local_decls = &mut body.local_decls;
for bb in blocks {
bb.expand_statements(|st| {
if let StatementKind::Assign(box (
lhs,
Rvalue::Use(Operand::Copy(rhs) | Operand::Move(rhs)),
)) = &st.kind
{
let ty = lhs.ty(local_decls, tcx).ty;
let source_info = st.source_info;
let span = source_info.span;
let (adt_def, num_variants, alloc_id) =
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_usize(tcx, num_variants as u64),
));
let size_array_local = local_decls.push(LocalDecl::new(tmp_ty, span));
let store_live = Statement {
source_info,
kind: StatementKind::StorageLive(size_array_local),
};
let place = Place::from(size_array_local);
let constant_vals = Constant {
span,
user_ty: None,
literal: ConstantKind::Val(
interpret::ConstValue::ByRef { alloc, offset: Size::ZERO },
tmp_ty,
),
};
let rval = Rvalue::Use(Operand::Constant(box (constant_vals)));
let const_assign =
Statement { source_info, kind: StatementKind::Assign(box (place, rval)) };
let discr_place = Place::from(
local_decls
.push(LocalDecl::new(adt_def.repr().discr_type().to_ty(tcx), span)),
);
let store_discr = Statement {
source_info,
kind: StatementKind::Assign(box (discr_place, Rvalue::Discriminant(*rhs))),
};
let discr_cast_place =
Place::from(local_decls.push(LocalDecl::new(tcx.types.usize, span)));
let cast_discr = Statement {
source_info,
kind: StatementKind::Assign(box (
discr_cast_place,
Rvalue::Cast(
CastKind::IntToInt,
Operand::Copy(discr_place),
tcx.types.usize,
),
)),
};
let size_place =
Place::from(local_decls.push(LocalDecl::new(tcx.types.usize, span)));
let store_size = Statement {
source_info,
kind: StatementKind::Assign(box (
size_place,
Rvalue::Use(Operand::Copy(Place {
local: size_array_local,
projection: tcx.intern_place_elems(&[PlaceElem::Index(
discr_cast_place.local,
)]),
})),
)),
};
let dst =
Place::from(local_decls.push(LocalDecl::new(tcx.mk_mut_ptr(ty), span)));
let dst_ptr = Statement {
source_info,
kind: StatementKind::Assign(box (
dst,
Rvalue::AddressOf(Mutability::Mut, *lhs),
)),
};
let dst_cast_ty = tcx.mk_mut_ptr(tcx.types.u8);
let dst_cast_place =
Place::from(local_decls.push(LocalDecl::new(dst_cast_ty, span)));
let dst_cast = Statement {
source_info,
kind: StatementKind::Assign(box (
dst_cast_place,
Rvalue::Cast(CastKind::PtrToPtr, Operand::Copy(dst), dst_cast_ty),
)),
};
let src =
Place::from(local_decls.push(LocalDecl::new(tcx.mk_imm_ptr(ty), span)));
let src_ptr = Statement {
source_info,
kind: StatementKind::Assign(box (
src,
Rvalue::AddressOf(Mutability::Not, *rhs),
)),
};
let src_cast_ty = tcx.mk_imm_ptr(tcx.types.u8);
let src_cast_place =
Place::from(local_decls.push(LocalDecl::new(src_cast_ty, span)));
let src_cast = Statement {
source_info,
kind: StatementKind::Assign(box (
src_cast_place,
Rvalue::Cast(CastKind::PtrToPtr, Operand::Copy(src), src_cast_ty),
)),
};
let deinit_old =
Statement { source_info, kind: StatementKind::Deinit(box dst) };
let copy_bytes = Statement {
source_info,
kind: StatementKind::Intrinsic(
box NonDivergingIntrinsic::CopyNonOverlapping(CopyNonOverlapping {
src: Operand::Copy(src_cast_place),
dst: Operand::Copy(dst_cast_place),
count: Operand::Copy(size_place),
}),
),
};
let store_dead = Statement {
source_info,
kind: StatementKind::StorageDead(size_array_local),
};
let iter = [
store_live,
const_assign,
store_discr,
cast_discr,
store_size,
dst_ptr,
dst_cast,
src_ptr,
src_cast,
deinit_old,
copy_bytes,
store_dead,
]
.into_iter();
st.make_nop();
Some(iter)
} else {
None
}
});
}
}
}

3
compiler/rustc_mir_transform/src/lib.rs
View File

@ -1,6 +1,7 @@
#![allow(rustc::potential_query_instability)]
#![feature(box_patterns)]
#![feature(drain_filter)]
#![feature(box_syntax)]
#![feature(let_chains)]
#![feature(map_try_insert)]
#![feature(min_specialization)]
@ -73,6 +74,7 @@ mod function_item_references;
mod generator;
mod inline;
mod instcombine;
mod large_enums;
mod lower_intrinsics;
mod lower_slice_len;
mod match_branches;
@ -583,6 +585,7 @@ fn run_optimization_passes<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
&simplify::SimplifyLocals::new("final"),
&multiple_return_terminators::MultipleReturnTerminators,
&deduplicate_blocks::DeduplicateBlocks,
&large_enums::EnumSizeOpt { discrepancy: 128 },
// Some cleanup necessary at least for LLVM and potentially other codegen backends.
&add_call_guards::CriticalCallEdges,
// Dump the end result for testing and debugging purposes.

68
tests/mir-opt/enum_opt.cand.EnumSizeOpt.32bit.diff Normal file
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@ -0,0 +1,68 @@
- // MIR for `cand` before EnumSizeOpt
+ // MIR for `cand` after EnumSizeOpt
fn cand() -> Candidate {
let mut _0: Candidate; // return place in scope 0 at $DIR/enum_opt.rs:+0:18: +0:27
let mut _1: Candidate; // in scope 0 at $DIR/enum_opt.rs:+1:7: +1:12
let mut _2: Candidate; // in scope 0 at $DIR/enum_opt.rs:+2:7: +2:34
let mut _3: [u8; 8196]; // in scope 0 at $DIR/enum_opt.rs:+2:24: +2:33
+ let mut _4: [usize; 2]; // in scope 0 at $DIR/enum_opt.rs:+2:3: +2:34
+ let mut _5: isize; // in scope 0 at $DIR/enum_opt.rs:+2:3: +2:34
+ let mut _6: usize; // in scope 0 at $DIR/enum_opt.rs:+2:3: +2:34
+ let mut _7: usize; // in scope 0 at $DIR/enum_opt.rs:+2:3: +2:34
+ let mut _8: *mut Candidate; // in scope 0 at $DIR/enum_opt.rs:+2:3: +2:34
+ let mut _9: *mut u8; // in scope 0 at $DIR/enum_opt.rs:+2:3: +2:34
+ let mut _10: *const Candidate; // in scope 0 at $DIR/enum_opt.rs:+2:3: +2:34
+ let mut _11: *const u8; // in scope 0 at $DIR/enum_opt.rs:+2:3: +2:34
+ let mut _12: [usize; 2]; // in scope 0 at $DIR/enum_opt.rs:+3:3: +3:4
+ let mut _13: isize; // in scope 0 at $DIR/enum_opt.rs:+3:3: +3:4
+ let mut _14: usize; // in scope 0 at $DIR/enum_opt.rs:+3:3: +3:4
+ let mut _15: usize; // in scope 0 at $DIR/enum_opt.rs:+3:3: +3:4
+ let mut _16: *mut Candidate; // in scope 0 at $DIR/enum_opt.rs:+3:3: +3:4
+ let mut _17: *mut u8; // in scope 0 at $DIR/enum_opt.rs:+3:3: +3:4
+ let mut _18: *const Candidate; // in scope 0 at $DIR/enum_opt.rs:+3:3: +3:4
+ let mut _19: *const u8; // in scope 0 at $DIR/enum_opt.rs:+3:3: +3:4
scope 1 {
debug a => _1; // in scope 1 at $DIR/enum_opt.rs:+1:7: +1:12
}
bb0: {
StorageLive(_1); // scope 0 at $DIR/enum_opt.rs:+1:7: +1:12
_1 = Candidate::Small(const 1_u8); // scope 0 at $DIR/enum_opt.rs:+1:15: +1:34
StorageLive(_2); // scope 1 at $DIR/enum_opt.rs:+2:7: +2:34
StorageLive(_3); // scope 1 at $DIR/enum_opt.rs:+2:24: +2:33
_3 = [const 1_u8; 8196]; // scope 1 at $DIR/enum_opt.rs:+2:24: +2:33
_2 = Candidate::Large(move _3); // scope 1 at $DIR/enum_opt.rs:+2:7: +2:34
StorageDead(_3); // scope 1 at $DIR/enum_opt.rs:+2:33: +2:34
- _1 = move _2; // scope 1 at $DIR/enum_opt.rs:+2:3: +2:34
+ StorageLive(_4); // scope 1 at $DIR/enum_opt.rs:+2:3: +2:34
+ _4 = const [2_usize, 8197_usize]; // scope 1 at $DIR/enum_opt.rs:+2:3: +2:34
+ _5 = discriminant(_2); // scope 1 at $DIR/enum_opt.rs:+2:3: +2:34
+ _6 = _5 as usize (IntToInt); // scope 1 at $DIR/enum_opt.rs:+2:3: +2:34
+ _7 = _4[_6]; // scope 1 at $DIR/enum_opt.rs:+2:3: +2:34
+ _8 = &raw mut _1; // scope 1 at $DIR/enum_opt.rs:+2:3: +2:34
+ _9 = _8 as *mut u8 (PtrToPtr); // scope 1 at $DIR/enum_opt.rs:+2:3: +2:34
+ _10 = &raw const _2; // scope 1 at $DIR/enum_opt.rs:+2:3: +2:34
+ _11 = _10 as *const u8 (PtrToPtr); // scope 1 at $DIR/enum_opt.rs:+2:3: +2:34
+ Deinit(_8); // scope 1 at $DIR/enum_opt.rs:+2:3: +2:34
+ copy_nonoverlapping(dst = _9, src = _11, count = _7); // scope 1 at $DIR/enum_opt.rs:+2:3: +2:34
+ StorageDead(_4); // scope 1 at $DIR/enum_opt.rs:+2:3: +2:34
StorageDead(_2); // scope 1 at $DIR/enum_opt.rs:+2:33: +2:34
- _0 = move _1; // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ StorageLive(_12); // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ _12 = const [2_usize, 8197_usize]; // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ _13 = discriminant(_1); // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ _14 = _13 as usize (IntToInt); // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ _15 = _12[_14]; // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ _16 = &raw mut _0; // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ _17 = _16 as *mut u8 (PtrToPtr); // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ _18 = &raw const _1; // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ _19 = _18 as *const u8 (PtrToPtr); // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ Deinit(_16); // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ copy_nonoverlapping(dst = _17, src = _19, count = _15); // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ StorageDead(_12); // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
StorageDead(_1); // scope 0 at $DIR/enum_opt.rs:+4:1: +4:2
return; // scope 0 at $DIR/enum_opt.rs:+4:2: +4:2
}
}

68
tests/mir-opt/enum_opt.cand.EnumSizeOpt.64bit.diff Normal file
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@ -0,0 +1,68 @@
- // MIR for `cand` before EnumSizeOpt
+ // MIR for `cand` after EnumSizeOpt
fn cand() -> Candidate {
let mut _0: Candidate; // return place in scope 0 at $DIR/enum_opt.rs:+0:18: +0:27
let mut _1: Candidate; // in scope 0 at $DIR/enum_opt.rs:+1:7: +1:12
let mut _2: Candidate; // in scope 0 at $DIR/enum_opt.rs:+2:7: +2:34
let mut _3: [u8; 8196]; // in scope 0 at $DIR/enum_opt.rs:+2:24: +2:33
+ let mut _4: [usize; 2]; // in scope 0 at $DIR/enum_opt.rs:+2:3: +2:34
+ let mut _5: isize; // in scope 0 at $DIR/enum_opt.rs:+2:3: +2:34
+ let mut _6: usize; // in scope 0 at $DIR/enum_opt.rs:+2:3: +2:34
+ let mut _7: usize; // in scope 0 at $DIR/enum_opt.rs:+2:3: +2:34
+ let mut _8: *mut Candidate; // in scope 0 at $DIR/enum_opt.rs:+2:3: +2:34
+ let mut _9: *mut u8; // in scope 0 at $DIR/enum_opt.rs:+2:3: +2:34
+ let mut _10: *const Candidate; // in scope 0 at $DIR/enum_opt.rs:+2:3: +2:34
+ let mut _11: *const u8; // in scope 0 at $DIR/enum_opt.rs:+2:3: +2:34
+ let mut _12: [usize; 2]; // in scope 0 at $DIR/enum_opt.rs:+3:3: +3:4
+ let mut _13: isize; // in scope 0 at $DIR/enum_opt.rs:+3:3: +3:4
+ let mut _14: usize; // in scope 0 at $DIR/enum_opt.rs:+3:3: +3:4
+ let mut _15: usize; // in scope 0 at $DIR/enum_opt.rs:+3:3: +3:4
+ let mut _16: *mut Candidate; // in scope 0 at $DIR/enum_opt.rs:+3:3: +3:4
+ let mut _17: *mut u8; // in scope 0 at $DIR/enum_opt.rs:+3:3: +3:4
+ let mut _18: *const Candidate; // in scope 0 at $DIR/enum_opt.rs:+3:3: +3:4
+ let mut _19: *const u8; // in scope 0 at $DIR/enum_opt.rs:+3:3: +3:4
scope 1 {
debug a => _1; // in scope 1 at $DIR/enum_opt.rs:+1:7: +1:12
}
bb0: {
StorageLive(_1); // scope 0 at $DIR/enum_opt.rs:+1:7: +1:12
_1 = Candidate::Small(const 1_u8); // scope 0 at $DIR/enum_opt.rs:+1:15: +1:34
StorageLive(_2); // scope 1 at $DIR/enum_opt.rs:+2:7: +2:34
StorageLive(_3); // scope 1 at $DIR/enum_opt.rs:+2:24: +2:33
_3 = [const 1_u8; 8196]; // scope 1 at $DIR/enum_opt.rs:+2:24: +2:33
_2 = Candidate::Large(move _3); // scope 1 at $DIR/enum_opt.rs:+2:7: +2:34
StorageDead(_3); // scope 1 at $DIR/enum_opt.rs:+2:33: +2:34
- _1 = move _2; // scope 1 at $DIR/enum_opt.rs:+2:3: +2:34
+ StorageLive(_4); // scope 1 at $DIR/enum_opt.rs:+2:3: +2:34
+ _4 = const [2_usize, 8197_usize]; // scope 1 at $DIR/enum_opt.rs:+2:3: +2:34
+ _5 = discriminant(_2); // scope 1 at $DIR/enum_opt.rs:+2:3: +2:34
+ _6 = _5 as usize (IntToInt); // scope 1 at $DIR/enum_opt.rs:+2:3: +2:34
+ _7 = _4[_6]; // scope 1 at $DIR/enum_opt.rs:+2:3: +2:34
+ _8 = &raw mut _1; // scope 1 at $DIR/enum_opt.rs:+2:3: +2:34
+ _9 = _8 as *mut u8 (PtrToPtr); // scope 1 at $DIR/enum_opt.rs:+2:3: +2:34
+ _10 = &raw const _2; // scope 1 at $DIR/enum_opt.rs:+2:3: +2:34
+ _11 = _10 as *const u8 (PtrToPtr); // scope 1 at $DIR/enum_opt.rs:+2:3: +2:34
+ Deinit(_8); // scope 1 at $DIR/enum_opt.rs:+2:3: +2:34
+ copy_nonoverlapping(dst = _9, src = _11, count = _7); // scope 1 at $DIR/enum_opt.rs:+2:3: +2:34
+ StorageDead(_4); // scope 1 at $DIR/enum_opt.rs:+2:3: +2:34
StorageDead(_2); // scope 1 at $DIR/enum_opt.rs:+2:33: +2:34
- _0 = move _1; // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ StorageLive(_12); // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ _12 = const [2_usize, 8197_usize]; // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ _13 = discriminant(_1); // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ _14 = _13 as usize (IntToInt); // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ _15 = _12[_14]; // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ _16 = &raw mut _0; // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ _17 = _16 as *mut u8 (PtrToPtr); // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ _18 = &raw const _1; // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ _19 = _18 as *const u8 (PtrToPtr); // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ Deinit(_16); // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ copy_nonoverlapping(dst = _17, src = _19, count = _15); // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ StorageDead(_12); // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
StorageDead(_1); // scope 0 at $DIR/enum_opt.rs:+4:1: +4:2
return; // scope 0 at $DIR/enum_opt.rs:+4:2: +4:2
}
}

28
tests/mir-opt/enum_opt.invalid.EnumSizeOpt.32bit.diff Normal file
View File

@ -0,0 +1,28 @@
- // MIR for `invalid` before EnumSizeOpt
+ // MIR for `invalid` after EnumSizeOpt
fn invalid() -> InvalidIdxs {
let mut _0: InvalidIdxs; // return place in scope 0 at $DIR/enum_opt.rs:+0:21: +0:32
let mut _1: InvalidIdxs; // in scope 0 at $DIR/enum_opt.rs:+1:7: +1:12
let mut _2: InvalidIdxs; // in scope 0 at $DIR/enum_opt.rs:+2:7: +2:36
let mut _3: [u64; 1024]; // in scope 0 at $DIR/enum_opt.rs:+2:26: +2:35
scope 1 {
debug a => _1; // in scope 1 at $DIR/enum_opt.rs:+1:7: +1:12
}
bb0: {
StorageLive(_1); // scope 0 at $DIR/enum_opt.rs:+1:7: +1:12
_1 = InvalidIdxs::A; // scope 0 at $DIR/enum_opt.rs:+1:15: +1:29
StorageLive(_2); // scope 1 at $DIR/enum_opt.rs:+2:7: +2:36
StorageLive(_3); // scope 1 at $DIR/enum_opt.rs:+2:26: +2:35
_3 = [const 0_u64; 1024]; // scope 1 at $DIR/enum_opt.rs:+2:26: +2:35
_2 = InvalidIdxs::Large(move _3); // scope 1 at $DIR/enum_opt.rs:+2:7: +2:36
StorageDead(_3); // scope 1 at $DIR/enum_opt.rs:+2:35: +2:36
_1 = move _2; // scope 1 at $DIR/enum_opt.rs:+2:3: +2:36
StorageDead(_2); // scope 1 at $DIR/enum_opt.rs:+2:35: +2:36
_0 = move _1; // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
StorageDead(_1); // scope 0 at $DIR/enum_opt.rs:+4:1: +4:2
return; // scope 0 at $DIR/enum_opt.rs:+4:2: +4:2
}
}

28
tests/mir-opt/enum_opt.invalid.EnumSizeOpt.64bit.diff Normal file
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@ -0,0 +1,28 @@
- // MIR for `invalid` before EnumSizeOpt
+ // MIR for `invalid` after EnumSizeOpt
fn invalid() -> InvalidIdxs {
let mut _0: InvalidIdxs; // return place in scope 0 at $DIR/enum_opt.rs:+0:21: +0:32
let mut _1: InvalidIdxs; // in scope 0 at $DIR/enum_opt.rs:+1:7: +1:12
let mut _2: InvalidIdxs; // in scope 0 at $DIR/enum_opt.rs:+2:7: +2:36
let mut _3: [u64; 1024]; // in scope 0 at $DIR/enum_opt.rs:+2:26: +2:35
scope 1 {
debug a => _1; // in scope 1 at $DIR/enum_opt.rs:+1:7: +1:12
}
bb0: {
StorageLive(_1); // scope 0 at $DIR/enum_opt.rs:+1:7: +1:12
_1 = InvalidIdxs::A; // scope 0 at $DIR/enum_opt.rs:+1:15: +1:29
StorageLive(_2); // scope 1 at $DIR/enum_opt.rs:+2:7: +2:36
StorageLive(_3); // scope 1 at $DIR/enum_opt.rs:+2:26: +2:35
_3 = [const 0_u64; 1024]; // scope 1 at $DIR/enum_opt.rs:+2:26: +2:35
_2 = InvalidIdxs::Large(move _3); // scope 1 at $DIR/enum_opt.rs:+2:7: +2:36
StorageDead(_3); // scope 1 at $DIR/enum_opt.rs:+2:35: +2:36
_1 = move _2; // scope 1 at $DIR/enum_opt.rs:+2:3: +2:36
StorageDead(_2); // scope 1 at $DIR/enum_opt.rs:+2:35: +2:36
_0 = move _1; // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
StorageDead(_1); // scope 0 at $DIR/enum_opt.rs:+4:1: +4:2
return; // scope 0 at $DIR/enum_opt.rs:+4:2: +4:2
}
}

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tests/mir-opt/enum_opt.rs Normal file
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@ -0,0 +1,86 @@
// unit-test: EnumSizeOpt
// EMIT_MIR_FOR_EACH_BIT_WIDTH
// compile-flags: -Zunsound-mir-opts
#![feature(arbitrary_enum_discriminant, repr128)]
// Tests that an enum with a variant with no data gets correctly transformed.
pub enum NoData {
Large([u8; 8196]),
None,
}
// Tests that an enum with a variant with data that is a valid candidate gets transformed.
pub enum Candidate {
Small(u8),
Large([u8; 8196]),
}
// Tests that an enum which has a discriminant much higher than the variant does not get
// tformed.
#[repr(u32)]
pub enum InvalidIdxs {
A = 302,
Large([u64; 1024]),
}
// Tests that an enum with too high of a discriminant index (not in bounds of usize) does not
// get tformed.
#[repr(u128)]
pub enum NotTrunctable {
A = 0,
B([u8; 1024]) = 1,
C([u8; 4096]) = 0x10000000000000001,
}
// Tests that an enum with discriminants in random order still gets tformed correctly.
#[repr(u32)]
pub enum RandOrderDiscr {
A = 13,
B([u8; 1024]) = 5,
C = 7,
}
// EMIT_MIR enum_opt.unin.EnumSizeOpt.diff
pub fn unin() -> NoData {
let mut a = NoData::None;
a = NoData::Large([1; 8196]);
a
}
// EMIT_MIR enum_opt.cand.EnumSizeOpt.diff
pub fn cand() -> Candidate {
let mut a = Candidate::Small(1);
a = Candidate::Large([1; 8196]);
a
}
// EMIT_MIR enum_opt.invalid.EnumSizeOpt.diff
pub fn invalid() -> InvalidIdxs {
let mut a = InvalidIdxs::A;
a = InvalidIdxs::Large([0; 1024]);
a
}
// EMIT_MIR enum_opt.trunc.EnumSizeOpt.diff
pub fn trunc() -> NotTrunctable {
let mut a = NotTrunctable::A;
a = NotTrunctable::B([0; 1024]);
a = NotTrunctable::C([0; 4096]);
a
}
pub fn rand_order() -> RandOrderDiscr {
let mut a = RandOrderDiscr::A;
a = RandOrderDiscr::B([0; 1024]);
a = RandOrderDiscr::C;
a
}
pub fn main() {
unin();
cand();
invalid();
trunc();
rand_order();
}

37
tests/mir-opt/enum_opt.trunc.EnumSizeOpt.32bit.diff Normal file
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@ -0,0 +1,37 @@
- // MIR for `trunc` before EnumSizeOpt
+ // MIR for `trunc` after EnumSizeOpt
fn trunc() -> NotTrunctable {
let mut _0: NotTrunctable; // return place in scope 0 at $DIR/enum_opt.rs:+0:19: +0:32
let mut _1: NotTrunctable; // in scope 0 at $DIR/enum_opt.rs:+1:7: +1:12
let mut _2: NotTrunctable; // in scope 0 at $DIR/enum_opt.rs:+2:7: +2:34
let mut _3: [u8; 1024]; // in scope 0 at $DIR/enum_opt.rs:+2:24: +2:33
let mut _4: NotTrunctable; // in scope 0 at $DIR/enum_opt.rs:+3:7: +3:34
let mut _5: [u8; 4096]; // in scope 0 at $DIR/enum_opt.rs:+3:24: +3:33
scope 1 {
debug a => _1; // in scope 1 at $DIR/enum_opt.rs:+1:7: +1:12
}
bb0: {
StorageLive(_1); // scope 0 at $DIR/enum_opt.rs:+1:7: +1:12
_1 = NotTrunctable::A; // scope 0 at $DIR/enum_opt.rs:+1:15: +1:31
StorageLive(_2); // scope 1 at $DIR/enum_opt.rs:+2:7: +2:34
StorageLive(_3); // scope 1 at $DIR/enum_opt.rs:+2:24: +2:33
_3 = [const 0_u8; 1024]; // scope 1 at $DIR/enum_opt.rs:+2:24: +2:33
_2 = NotTrunctable::B(move _3); // scope 1 at $DIR/enum_opt.rs:+2:7: +2:34
StorageDead(_3); // scope 1 at $DIR/enum_opt.rs:+2:33: +2:34
_1 = move _2; // scope 1 at $DIR/enum_opt.rs:+2:3: +2:34
StorageDead(_2); // scope 1 at $DIR/enum_opt.rs:+2:33: +2:34
StorageLive(_4); // scope 1 at $DIR/enum_opt.rs:+3:7: +3:34
StorageLive(_5); // scope 1 at $DIR/enum_opt.rs:+3:24: +3:33
_5 = [const 0_u8; 4096]; // scope 1 at $DIR/enum_opt.rs:+3:24: +3:33
_4 = NotTrunctable::C(move _5); // scope 1 at $DIR/enum_opt.rs:+3:7: +3:34
StorageDead(_5); // scope 1 at $DIR/enum_opt.rs:+3:33: +3:34
_1 = move _4; // scope 1 at $DIR/enum_opt.rs:+3:3: +3:34
StorageDead(_4); // scope 1 at $DIR/enum_opt.rs:+3:33: +3:34
_0 = move _1; // scope 1 at $DIR/enum_opt.rs:+4:3: +4:4
StorageDead(_1); // scope 0 at $DIR/enum_opt.rs:+5:1: +5:2
return; // scope 0 at $DIR/enum_opt.rs:+5:2: +5:2
}
}

37
tests/mir-opt/enum_opt.trunc.EnumSizeOpt.64bit.diff Normal file
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@ -0,0 +1,37 @@
- // MIR for `trunc` before EnumSizeOpt
+ // MIR for `trunc` after EnumSizeOpt
fn trunc() -> NotTrunctable {
let mut _0: NotTrunctable; // return place in scope 0 at $DIR/enum_opt.rs:+0:19: +0:32
let mut _1: NotTrunctable; // in scope 0 at $DIR/enum_opt.rs:+1:7: +1:12
let mut _2: NotTrunctable; // in scope 0 at $DIR/enum_opt.rs:+2:7: +2:34
let mut _3: [u8; 1024]; // in scope 0 at $DIR/enum_opt.rs:+2:24: +2:33
let mut _4: NotTrunctable; // in scope 0 at $DIR/enum_opt.rs:+3:7: +3:34
let mut _5: [u8; 4096]; // in scope 0 at $DIR/enum_opt.rs:+3:24: +3:33
scope 1 {
debug a => _1; // in scope 1 at $DIR/enum_opt.rs:+1:7: +1:12
}
bb0: {
StorageLive(_1); // scope 0 at $DIR/enum_opt.rs:+1:7: +1:12
_1 = NotTrunctable::A; // scope 0 at $DIR/enum_opt.rs:+1:15: +1:31
StorageLive(_2); // scope 1 at $DIR/enum_opt.rs:+2:7: +2:34
StorageLive(_3); // scope 1 at $DIR/enum_opt.rs:+2:24: +2:33
_3 = [const 0_u8; 1024]; // scope 1 at $DIR/enum_opt.rs:+2:24: +2:33
_2 = NotTrunctable::B(move _3); // scope 1 at $DIR/enum_opt.rs:+2:7: +2:34
StorageDead(_3); // scope 1 at $DIR/enum_opt.rs:+2:33: +2:34
_1 = move _2; // scope 1 at $DIR/enum_opt.rs:+2:3: +2:34
StorageDead(_2); // scope 1 at $DIR/enum_opt.rs:+2:33: +2:34
StorageLive(_4); // scope 1 at $DIR/enum_opt.rs:+3:7: +3:34
StorageLive(_5); // scope 1 at $DIR/enum_opt.rs:+3:24: +3:33
_5 = [const 0_u8; 4096]; // scope 1 at $DIR/enum_opt.rs:+3:24: +3:33
_4 = NotTrunctable::C(move _5); // scope 1 at $DIR/enum_opt.rs:+3:7: +3:34
StorageDead(_5); // scope 1 at $DIR/enum_opt.rs:+3:33: +3:34
_1 = move _4; // scope 1 at $DIR/enum_opt.rs:+3:3: +3:34
StorageDead(_4); // scope 1 at $DIR/enum_opt.rs:+3:33: +3:34
_0 = move _1; // scope 1 at $DIR/enum_opt.rs:+4:3: +4:4
StorageDead(_1); // scope 0 at $DIR/enum_opt.rs:+5:1: +5:2
return; // scope 0 at $DIR/enum_opt.rs:+5:2: +5:2
}
}

68
tests/mir-opt/enum_opt.unin.EnumSizeOpt.32bit.diff Normal file
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@ -0,0 +1,68 @@
- // MIR for `unin` before EnumSizeOpt
+ // MIR for `unin` after EnumSizeOpt
fn unin() -> NoData {
let mut _0: NoData; // return place in scope 0 at $DIR/enum_opt.rs:+0:18: +0:24
let mut _1: NoData; // in scope 0 at $DIR/enum_opt.rs:+1:7: +1:12
let mut _2: NoData; // in scope 0 at $DIR/enum_opt.rs:+2:7: +2:31
let mut _3: [u8; 8196]; // in scope 0 at $DIR/enum_opt.rs:+2:21: +2:30
+ let mut _4: [usize; 2]; // in scope 0 at $DIR/enum_opt.rs:+2:3: +2:31
+ let mut _5: isize; // in scope 0 at $DIR/enum_opt.rs:+2:3: +2:31
+ let mut _6: usize; // in scope 0 at $DIR/enum_opt.rs:+2:3: +2:31
+ let mut _7: usize; // in scope 0 at $DIR/enum_opt.rs:+2:3: +2:31
+ let mut _8: *mut NoData; // in scope 0 at $DIR/enum_opt.rs:+2:3: +2:31
+ let mut _9: *mut u8; // in scope 0 at $DIR/enum_opt.rs:+2:3: +2:31
+ let mut _10: *const NoData; // in scope 0 at $DIR/enum_opt.rs:+2:3: +2:31
+ let mut _11: *const u8; // in scope 0 at $DIR/enum_opt.rs:+2:3: +2:31
+ let mut _12: [usize; 2]; // in scope 0 at $DIR/enum_opt.rs:+3:3: +3:4
+ let mut _13: isize; // in scope 0 at $DIR/enum_opt.rs:+3:3: +3:4
+ let mut _14: usize; // in scope 0 at $DIR/enum_opt.rs:+3:3: +3:4
+ let mut _15: usize; // in scope 0 at $DIR/enum_opt.rs:+3:3: +3:4
+ let mut _16: *mut NoData; // in scope 0 at $DIR/enum_opt.rs:+3:3: +3:4
+ let mut _17: *mut u8; // in scope 0 at $DIR/enum_opt.rs:+3:3: +3:4
+ let mut _18: *const NoData; // in scope 0 at $DIR/enum_opt.rs:+3:3: +3:4
+ let mut _19: *const u8; // in scope 0 at $DIR/enum_opt.rs:+3:3: +3:4
scope 1 {
debug a => _1; // in scope 1 at $DIR/enum_opt.rs:+1:7: +1:12
}
bb0: {
StorageLive(_1); // scope 0 at $DIR/enum_opt.rs:+1:7: +1:12
_1 = NoData::None; // scope 0 at $DIR/enum_opt.rs:+1:15: +1:27
StorageLive(_2); // scope 1 at $DIR/enum_opt.rs:+2:7: +2:31
StorageLive(_3); // scope 1 at $DIR/enum_opt.rs:+2:21: +2:30
_3 = [const 1_u8; 8196]; // scope 1 at $DIR/enum_opt.rs:+2:21: +2:30
_2 = NoData::Large(move _3); // scope 1 at $DIR/enum_opt.rs:+2:7: +2:31
StorageDead(_3); // scope 1 at $DIR/enum_opt.rs:+2:30: +2:31
- _1 = move _2; // scope 1 at $DIR/enum_opt.rs:+2:3: +2:31
+ StorageLive(_4); // scope 1 at $DIR/enum_opt.rs:+2:3: +2:31
+ _4 = const [8197_usize, 1_usize]; // scope 1 at $DIR/enum_opt.rs:+2:3: +2:31
+ _5 = discriminant(_2); // scope 1 at $DIR/enum_opt.rs:+2:3: +2:31
+ _6 = _5 as usize (IntToInt); // scope 1 at $DIR/enum_opt.rs:+2:3: +2:31
+ _7 = _4[_6]; // scope 1 at $DIR/enum_opt.rs:+2:3: +2:31
+ _8 = &raw mut _1; // scope 1 at $DIR/enum_opt.rs:+2:3: +2:31
+ _9 = _8 as *mut u8 (PtrToPtr); // scope 1 at $DIR/enum_opt.rs:+2:3: +2:31
+ _10 = &raw const _2; // scope 1 at $DIR/enum_opt.rs:+2:3: +2:31
+ _11 = _10 as *const u8 (PtrToPtr); // scope 1 at $DIR/enum_opt.rs:+2:3: +2:31
+ Deinit(_8); // scope 1 at $DIR/enum_opt.rs:+2:3: +2:31
+ copy_nonoverlapping(dst = _9, src = _11, count = _7); // scope 1 at $DIR/enum_opt.rs:+2:3: +2:31
+ StorageDead(_4); // scope 1 at $DIR/enum_opt.rs:+2:3: +2:31
StorageDead(_2); // scope 1 at $DIR/enum_opt.rs:+2:30: +2:31
- _0 = move _1; // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ StorageLive(_12); // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ _12 = const [8197_usize, 1_usize]; // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ _13 = discriminant(_1); // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ _14 = _13 as usize (IntToInt); // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ _15 = _12[_14]; // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ _16 = &raw mut _0; // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ _17 = _16 as *mut u8 (PtrToPtr); // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ _18 = &raw const _1; // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ _19 = _18 as *const u8 (PtrToPtr); // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ Deinit(_16); // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ copy_nonoverlapping(dst = _17, src = _19, count = _15); // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ StorageDead(_12); // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
StorageDead(_1); // scope 0 at $DIR/enum_opt.rs:+4:1: +4:2
return; // scope 0 at $DIR/enum_opt.rs:+4:2: +4:2
}
}

68
tests/mir-opt/enum_opt.unin.EnumSizeOpt.64bit.diff Normal file
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@ -0,0 +1,68 @@
- // MIR for `unin` before EnumSizeOpt
+ // MIR for `unin` after EnumSizeOpt
fn unin() -> NoData {
let mut _0: NoData; // return place in scope 0 at $DIR/enum_opt.rs:+0:18: +0:24
let mut _1: NoData; // in scope 0 at $DIR/enum_opt.rs:+1:7: +1:12
let mut _2: NoData; // in scope 0 at $DIR/enum_opt.rs:+2:7: +2:31
let mut _3: [u8; 8196]; // in scope 0 at $DIR/enum_opt.rs:+2:21: +2:30
+ let mut _4: [usize; 2]; // in scope 0 at $DIR/enum_opt.rs:+2:3: +2:31
+ let mut _5: isize; // in scope 0 at $DIR/enum_opt.rs:+2:3: +2:31
+ let mut _6: usize; // in scope 0 at $DIR/enum_opt.rs:+2:3: +2:31
+ let mut _7: usize; // in scope 0 at $DIR/enum_opt.rs:+2:3: +2:31
+ let mut _8: *mut NoData; // in scope 0 at $DIR/enum_opt.rs:+2:3: +2:31
+ let mut _9: *mut u8; // in scope 0 at $DIR/enum_opt.rs:+2:3: +2:31
+ let mut _10: *const NoData; // in scope 0 at $DIR/enum_opt.rs:+2:3: +2:31
+ let mut _11: *const u8; // in scope 0 at $DIR/enum_opt.rs:+2:3: +2:31
+ let mut _12: [usize; 2]; // in scope 0 at $DIR/enum_opt.rs:+3:3: +3:4
+ let mut _13: isize; // in scope 0 at $DIR/enum_opt.rs:+3:3: +3:4
+ let mut _14: usize; // in scope 0 at $DIR/enum_opt.rs:+3:3: +3:4
+ let mut _15: usize; // in scope 0 at $DIR/enum_opt.rs:+3:3: +3:4
+ let mut _16: *mut NoData; // in scope 0 at $DIR/enum_opt.rs:+3:3: +3:4
+ let mut _17: *mut u8; // in scope 0 at $DIR/enum_opt.rs:+3:3: +3:4
+ let mut _18: *const NoData; // in scope 0 at $DIR/enum_opt.rs:+3:3: +3:4
+ let mut _19: *const u8; // in scope 0 at $DIR/enum_opt.rs:+3:3: +3:4
scope 1 {
debug a => _1; // in scope 1 at $DIR/enum_opt.rs:+1:7: +1:12
}
bb0: {
StorageLive(_1); // scope 0 at $DIR/enum_opt.rs:+1:7: +1:12
_1 = NoData::None; // scope 0 at $DIR/enum_opt.rs:+1:15: +1:27
StorageLive(_2); // scope 1 at $DIR/enum_opt.rs:+2:7: +2:31
StorageLive(_3); // scope 1 at $DIR/enum_opt.rs:+2:21: +2:30
_3 = [const 1_u8; 8196]; // scope 1 at $DIR/enum_opt.rs:+2:21: +2:30
_2 = NoData::Large(move _3); // scope 1 at $DIR/enum_opt.rs:+2:7: +2:31
StorageDead(_3); // scope 1 at $DIR/enum_opt.rs:+2:30: +2:31
- _1 = move _2; // scope 1 at $DIR/enum_opt.rs:+2:3: +2:31
+ StorageLive(_4); // scope 1 at $DIR/enum_opt.rs:+2:3: +2:31
+ _4 = const [8197_usize, 1_usize]; // scope 1 at $DIR/enum_opt.rs:+2:3: +2:31
+ _5 = discriminant(_2); // scope 1 at $DIR/enum_opt.rs:+2:3: +2:31
+ _6 = _5 as usize (IntToInt); // scope 1 at $DIR/enum_opt.rs:+2:3: +2:31
+ _7 = _4[_6]; // scope 1 at $DIR/enum_opt.rs:+2:3: +2:31
+ _8 = &raw mut _1; // scope 1 at $DIR/enum_opt.rs:+2:3: +2:31
+ _9 = _8 as *mut u8 (PtrToPtr); // scope 1 at $DIR/enum_opt.rs:+2:3: +2:31
+ _10 = &raw const _2; // scope 1 at $DIR/enum_opt.rs:+2:3: +2:31
+ _11 = _10 as *const u8 (PtrToPtr); // scope 1 at $DIR/enum_opt.rs:+2:3: +2:31
+ Deinit(_8); // scope 1 at $DIR/enum_opt.rs:+2:3: +2:31
+ copy_nonoverlapping(dst = _9, src = _11, count = _7); // scope 1 at $DIR/enum_opt.rs:+2:3: +2:31
+ StorageDead(_4); // scope 1 at $DIR/enum_opt.rs:+2:3: +2:31
StorageDead(_2); // scope 1 at $DIR/enum_opt.rs:+2:30: +2:31
- _0 = move _1; // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ StorageLive(_12); // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ _12 = const [8197_usize, 1_usize]; // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ _13 = discriminant(_1); // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ _14 = _13 as usize (IntToInt); // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ _15 = _12[_14]; // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ _16 = &raw mut _0; // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ _17 = _16 as *mut u8 (PtrToPtr); // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ _18 = &raw const _1; // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ _19 = _18 as *const u8 (PtrToPtr); // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ Deinit(_16); // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ copy_nonoverlapping(dst = _17, src = _19, count = _15); // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
+ StorageDead(_12); // scope 1 at $DIR/enum_opt.rs:+3:3: +3:4
StorageDead(_1); // scope 0 at $DIR/enum_opt.rs:+4:1: +4:2
return; // scope 0 at $DIR/enum_opt.rs:+4:2: +4:2
}
}