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Auto merge of #128299 - DianQK:clone-copy, r=cjgillot

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Simplify the canonical clone method and the copy-like forms to copy

Fixes #128081.

The optimized clone method ends up as the following MIR:

```
_2 = copy ((*_1).0: i32);
_3 = copy ((*_1).1: u64);
_4 = copy ((*_1).2: [i8; 3]);
_0 = Foo { a: move _2, b: move _3, c: move _4 };
```

We can transform this to:

```
_0 = copy (*_1);
```

r? `@cjgillot`
This commit is contained in:
bors 2024-09-14 13:30:30 +00:00
commit e7386b361d
28 changed files with 1648 additions and 53 deletions
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98
compiler/rustc_mir_transform/src/gvn.rs
View File

@ -875,6 +875,95 @@ impl<'body, 'tcx> VnState<'body, 'tcx> {
None
}
fn try_as_place_elem(
&mut self,
proj: ProjectionElem<VnIndex, Ty<'tcx>>,
loc: Location,
) -> Option<PlaceElem<'tcx>> {
Some(match proj {
ProjectionElem::Deref => ProjectionElem::Deref,
ProjectionElem::Field(idx, ty) => ProjectionElem::Field(idx, ty),
ProjectionElem::Index(idx) => {
let Some(local) = self.try_as_local(idx, loc) else {
return None;
};
self.reused_locals.insert(local);
ProjectionElem::Index(local)
}
ProjectionElem::ConstantIndex { offset, min_length, from_end } => {
ProjectionElem::ConstantIndex { offset, min_length, from_end }
}
ProjectionElem::Subslice { from, to, from_end } => {
ProjectionElem::Subslice { from, to, from_end }
}
ProjectionElem::Downcast(symbol, idx) => ProjectionElem::Downcast(symbol, idx),
ProjectionElem::OpaqueCast(idx) => ProjectionElem::OpaqueCast(idx),
ProjectionElem::Subtype(idx) => ProjectionElem::Subtype(idx),
})
}
fn simplify_aggregate_to_copy(
&mut self,
rvalue: &mut Rvalue<'tcx>,
location: Location,
fields: &[VnIndex],
variant_index: VariantIdx,
) -> Option<VnIndex> {
let Some(&first_field) = fields.first() else {
return None;
};
let Value::Projection(copy_from_value, _) = *self.get(first_field) else {
return None;
};
// All fields must correspond one-to-one and come from the same aggregate value.
if fields.iter().enumerate().any(|(index, &v)| {
if let Value::Projection(pointer, ProjectionElem::Field(from_index, _)) = *self.get(v)
&& copy_from_value == pointer
&& from_index.index() == index
{
return false;
}
true
}) {
return None;
}
let mut copy_from_local_value = copy_from_value;
if let Value::Projection(pointer, proj) = *self.get(copy_from_value)
&& let ProjectionElem::Downcast(_, read_variant) = proj
{
if variant_index == read_variant {
// When copying a variant, there is no need to downcast.
copy_from_local_value = pointer;
} else {
// The copied variant must be identical.
return None;
}
}
let tcx = self.tcx;
let mut projection = SmallVec::<[PlaceElem<'tcx>; 1]>::new();
loop {
if let Some(local) = self.try_as_local(copy_from_local_value, location) {
projection.reverse();
let place = Place { local, projection: tcx.mk_place_elems(projection.as_slice()) };
if rvalue.ty(self.local_decls, tcx) == place.ty(self.local_decls, tcx).ty {
self.reused_locals.insert(local);
*rvalue = Rvalue::Use(Operand::Copy(place));
return Some(copy_from_value);
}
return None;
} else if let Value::Projection(pointer, proj) = *self.get(copy_from_local_value)
&& let Some(proj) = self.try_as_place_elem(proj, location)
{
projection.push(proj);
copy_from_local_value = pointer;
} else {
return None;
}
}
}
fn simplify_aggregate(
&mut self,
rvalue: &mut Rvalue<'tcx>,
@ -971,6 +1060,13 @@ impl<'body, 'tcx> VnState<'body, 'tcx> {
}
}
if let AggregateTy::Def(_, _) = ty
&& let Some(value) =
self.simplify_aggregate_to_copy(rvalue, location, &fields, variant_index)
{
return Some(value);
}
Some(self.insert(Value::Aggregate(ty, variant_index, fields)))
}
@ -1485,7 +1581,7 @@ impl<'tcx> VnState<'_, 'tcx> {
}
/// If there is a local which is assigned `index`, and its assignment strictly dominates `loc`,
/// return it.
/// return it. If you used this local, add it to `reused_locals` to remove storage statements.
fn try_as_local(&mut self, index: VnIndex, loc: Location) -> Option<Local> {
let other = self.rev_locals.get(index)?;
other

40
tests/codegen/clone_as_copy.rs Normal file
View File

@ -0,0 +1,40 @@
//@ revisions: DEBUGINFO NODEBUGINFO
//@ compile-flags: -O -Cno-prepopulate-passes
//@ [DEBUGINFO] compile-flags: -Cdebuginfo=full
// From https://github.com/rust-lang/rust/issues/128081.
// Ensure that we only generate a memcpy instruction.
#![crate_type = "lib"]
#[derive(Clone)]
struct SubCloneAndCopy {
v1: u32,
v2: u32,
}
#[derive(Clone)]
struct CloneOnly {
v1: u8,
v2: u8,
v3: u8,
v4: u8,
v5: u8,
v6: u8,
v7: u8,
v8: u8,
v9: u8,
v_sub: SubCloneAndCopy,
v_large: [u8; 256],
}
// CHECK-LABEL: define {{.*}}@clone_only(
#[no_mangle]
pub fn clone_only(v: &CloneOnly) -> CloneOnly {
// CHECK-NOT: call {{.*}}clone
// CHECK-NOT: store i8
// CHECK-NOT: store i32
// CHECK: call void @llvm.memcpy
// CHECK-NEXT: ret void
v.clone()
}

6
tests/codegen/enum/unreachable_enum_default_branch.rs
View File

@ -28,11 +28,13 @@ pub fn implicit_match(x: Int) -> bool {
// The code is from https://github.com/rust-lang/rust/issues/110097.
// We expect it to generate the same optimized code as a full match.
// CHECK-LABEL: @if_let(
// CHECK-NEXT: start:
// CHECK: start:
// CHECK-NOT: zext
// CHECK: select
// CHECK-NEXT: insertvalue
// CHECK-NEXT: insertvalue
// CHECK-NEXT: ret
#[no_mangle]
pub fn if_let(val: Result<i32, ()>) -> Result<i32, ()> {
if let Ok(x) = val { Ok(x) } else { Err(()) }
if let Ok(x) = val { Ok(x * 2) } else { Err(()) }
}

7
tests/codegen/try_question_mark_nop.rs
View File

@ -1,5 +1,7 @@
//@ compile-flags: -O -Z merge-functions=disabled --edition=2021
//@ only-x86_64
// FIXME: Remove the `min-llvm-version`.
//@ min-llvm-version: 19
#![crate_type = "lib"]
#![feature(try_blocks)]
@ -7,11 +9,14 @@
use std::ops::ControlFlow::{self, Break, Continue};
use std::ptr::NonNull;
// FIXME: The `trunc` and `select` instructions can be eliminated.
// CHECK-LABEL: @option_nop_match_32
#[no_mangle]
pub fn option_nop_match_32(x: Option<u32>) -> Option<u32> {
// CHECK: start:
// CHECK-NEXT: insertvalue { i32, i32 }
// CHECK-NEXT: [[TRUNC:%.*]] = trunc nuw i32 %0 to i1
// CHECK-NEXT: [[FIRST:%.*]] = select i1 [[TRUNC]], i32 %0
// CHECK-NEXT: insertvalue { i32, i32 } poison, i32 [[FIRST]]
// CHECK-NEXT: insertvalue { i32, i32 }
// CHECK-NEXT: ret { i32, i32 }
match x {

17
tests/mir-opt/gvn_clone.rs Normal file
View File

@ -0,0 +1,17 @@
//@ test-mir-pass: GVN
//@ compile-flags: -Zmir-enable-passes=+InstSimplify-before-inline
// Check if we have transformed the default clone to copy in the specific pipeline.
// EMIT_MIR gvn_clone.{impl#0}-clone.GVN.diff
// CHECK-LABEL: ::clone(
// CHECK-NOT: = AllCopy { {{.*}} };
// CHECK: _0 = copy (*_1);
// CHECK: return;
#[derive(Clone)]
struct AllCopy {
a: i32,
b: u64,
c: [i8; 3],
}

71
tests/mir-opt/gvn_clone.{impl#0}-clone.GVN.diff Normal file
View File

@ -0,0 +1,71 @@
- // MIR for `<impl at $DIR/gvn_clone.rs:12:10: 12:15>::clone` before GVN
+ // MIR for `<impl at $DIR/gvn_clone.rs:12:10: 12:15>::clone` after GVN
fn <impl at $DIR/gvn_clone.rs:12:10: 12:15>::clone(_1: &AllCopy) -> AllCopy {
debug self => _1;
let mut _0: AllCopy;
let mut _2: i32;
let mut _3: &i32;
let _4: &i32;
let mut _5: u64;
let mut _6: &u64;
let _7: &u64;
let mut _8: [i8; 3];
let mut _9: &[i8; 3];
let _10: &[i8; 3];
bb0: {
StorageLive(_2);
StorageLive(_3);
- StorageLive(_4);
+ nop;
_4 = &((*_1).0: i32);
_3 = copy _4;
- _2 = copy (*_3);
+ _2 = copy ((*_1).0: i32);
goto -> bb1;
}
bb1: {
StorageDead(_3);
StorageLive(_5);
StorageLive(_6);
- StorageLive(_7);
+ nop;
_7 = &((*_1).1: u64);
_6 = copy _7;
- _5 = copy (*_6);
+ _5 = copy ((*_1).1: u64);
goto -> bb2;
}
bb2: {
StorageDead(_6);
StorageLive(_8);
StorageLive(_9);
- StorageLive(_10);
+ nop;
_10 = &((*_1).2: [i8; 3]);
_9 = copy _10;
- _8 = copy (*_9);
+ _8 = copy ((*_1).2: [i8; 3]);
goto -> bb3;
}
bb3: {
StorageDead(_9);
- _0 = AllCopy { a: move _2, b: move _5, c: move _8 };
+ _0 = copy (*_1);
StorageDead(_8);
StorageDead(_5);
StorageDead(_2);
- StorageDead(_10);
- StorageDead(_7);
- StorageDead(_4);
+ nop;
+ nop;
+ nop;
return;
}
}

53
tests/mir-opt/gvn_copy_aggregate.all_copy.GVN.diff Normal file
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@ -0,0 +1,53 @@
- // MIR for `all_copy` before GVN
+ // MIR for `all_copy` after GVN
fn all_copy(_1: &AllCopy) -> AllCopy {
debug v => _1;
let mut _0: AllCopy;
let _2: i32;
let mut _5: i32;
let mut _6: u64;
let mut _7: [i8; 3];
scope 1 {
debug a => _2;
let _3: u64;
scope 2 {
debug b => _3;
let _4: [i8; 3];
scope 3 {
debug c => _4;
}
}
}
bb0: {
- StorageLive(_2);
+ nop;
_2 = copy ((*_1).0: i32);
- StorageLive(_3);
+ nop;
_3 = copy ((*_1).1: u64);
- StorageLive(_4);
+ nop;
_4 = copy ((*_1).2: [i8; 3]);
StorageLive(_5);
_5 = copy _2;
StorageLive(_6);
_6 = copy _3;
StorageLive(_7);
_7 = copy _4;
- _0 = AllCopy { a: move _5, b: move _6, c: move _7 };
+ _0 = copy (*_1);
StorageDead(_7);
StorageDead(_6);
StorageDead(_5);
- StorageDead(_4);
- StorageDead(_3);
- StorageDead(_2);
+ nop;
+ nop;
+ nop;
return;
}
}

64
tests/mir-opt/gvn_copy_aggregate.all_copy_2.GVN.diff Normal file
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@ -0,0 +1,64 @@
- // MIR for `all_copy_2` before GVN
+ // MIR for `all_copy_2` after GVN
fn all_copy_2(_1: &&AllCopy) -> AllCopy {
debug v => _1;
let mut _0: AllCopy;
let _2: i32;
let mut _5: i32;
let mut _6: u64;
let mut _7: [i8; 3];
let mut _8: &AllCopy;
let mut _9: &AllCopy;
let mut _10: &AllCopy;
scope 1 {
debug a => _2;
let _3: u64;
scope 2 {
debug b => _3;
let _4: [i8; 3];
scope 3 {
debug c => _4;
}
}
}
bb0: {
- StorageLive(_2);
- _8 = deref_copy (*_1);
+ nop;
+ _8 = copy (*_1);
_2 = copy ((*_8).0: i32);
- StorageLive(_3);
- _9 = deref_copy (*_1);
- _3 = copy ((*_9).1: u64);
- StorageLive(_4);
- _10 = deref_copy (*_1);
- _4 = copy ((*_10).2: [i8; 3]);
+ nop;
+ _9 = copy _8;
+ _3 = copy ((*_8).1: u64);
+ nop;
+ _10 = copy _8;
+ _4 = copy ((*_8).2: [i8; 3]);
StorageLive(_5);
_5 = copy _2;
StorageLive(_6);
_6 = copy _3;
StorageLive(_7);
_7 = copy _4;
- _0 = AllCopy { a: move _5, b: move _6, c: move _7 };
+ _0 = copy (*_8);
StorageDead(_7);
StorageDead(_6);
StorageDead(_5);
- StorageDead(_4);
- StorageDead(_3);
- StorageDead(_2);
+ nop;
+ nop;
+ nop;
return;
}
}

53
tests/mir-opt/gvn_copy_aggregate.all_copy_different_type.GVN.diff Normal file
View File

@ -0,0 +1,53 @@
- // MIR for `all_copy_different_type` before GVN
+ // MIR for `all_copy_different_type` after GVN
fn all_copy_different_type(_1: &AllCopy) -> AllCopy2 {
debug v => _1;
let mut _0: AllCopy2;
let _2: i32;
let mut _5: i32;
let mut _6: u64;
let mut _7: [i8; 3];
scope 1 {
debug a => _2;
let _3: u64;
scope 2 {
debug b => _3;
let _4: [i8; 3];
scope 3 {
debug c => _4;
}
}
}
bb0: {
- StorageLive(_2);
+ nop;
_2 = copy ((*_1).0: i32);
- StorageLive(_3);
+ nop;
_3 = copy ((*_1).1: u64);
- StorageLive(_4);
+ nop;
_4 = copy ((*_1).2: [i8; 3]);
StorageLive(_5);
_5 = copy _2;
StorageLive(_6);
_6 = copy _3;
StorageLive(_7);
_7 = copy _4;
- _0 = AllCopy2 { a: move _5, b: move _6, c: move _7 };
+ _0 = AllCopy2 { a: copy _2, b: copy _3, c: copy _4 };
StorageDead(_7);
StorageDead(_6);
StorageDead(_5);
- StorageDead(_4);
- StorageDead(_3);
- StorageDead(_2);
+ nop;
+ nop;
+ nop;
return;
}
}

54
tests/mir-opt/gvn_copy_aggregate.all_copy_has_changed.GVN.diff Normal file
View File

@ -0,0 +1,54 @@
- // MIR for `all_copy_has_changed` before GVN
+ // MIR for `all_copy_has_changed` after GVN
fn all_copy_has_changed(_1: &mut AllCopy) -> AllCopy {
debug v => _1;
let mut _0: AllCopy;
let _2: i32;
let mut _5: i32;
let mut _6: u64;
let mut _7: [i8; 3];
scope 1 {
debug a => _2;
let _3: u64;
scope 2 {
debug b => _3;
let _4: [i8; 3];
scope 3 {
debug c => _4;
}
}
}
bb0: {
- StorageLive(_2);
+ nop;
_2 = copy ((*_1).0: i32);
- StorageLive(_3);
+ nop;
_3 = copy ((*_1).1: u64);
- StorageLive(_4);
+ nop;
_4 = copy ((*_1).2: [i8; 3]);
((*_1).0: i32) = const 1_i32;
StorageLive(_5);
_5 = copy _2;
StorageLive(_6);
_6 = copy _3;
StorageLive(_7);
_7 = copy _4;
- _0 = AllCopy { a: move _5, b: move _6, c: move _7 };
+ _0 = AllCopy { a: copy _2, b: copy _3, c: copy _4 };
StorageDead(_7);
StorageDead(_6);
StorageDead(_5);
- StorageDead(_4);
- StorageDead(_3);
- StorageDead(_2);
+ nop;
+ nop;
+ nop;
return;
}
}

53
tests/mir-opt/gvn_copy_aggregate.all_copy_move.GVN.diff Normal file
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@ -0,0 +1,53 @@
- // MIR for `all_copy_move` before GVN
+ // MIR for `all_copy_move` after GVN
fn all_copy_move(_1: AllCopy) -> AllCopy {
debug v => _1;
let mut _0: AllCopy;
let _2: i32;
let mut _5: i32;
let mut _6: u64;
let mut _7: [i8; 3];
scope 1 {
debug a => _2;
let _3: u64;
scope 2 {
debug b => _3;
let _4: [i8; 3];
scope 3 {
debug c => _4;
}
}
}
bb0: {
- StorageLive(_2);
+ nop;
_2 = copy (_1.0: i32);
- StorageLive(_3);
+ nop;
_3 = copy (_1.1: u64);
- StorageLive(_4);
+ nop;
_4 = copy (_1.2: [i8; 3]);
StorageLive(_5);
_5 = copy _2;
StorageLive(_6);
_6 = copy _3;
StorageLive(_7);
_7 = copy _4;
- _0 = AllCopy { a: move _5, b: move _6, c: move _7 };
+ _0 = copy _1;
StorageDead(_7);
StorageDead(_6);
StorageDead(_5);
- StorageDead(_4);
- StorageDead(_3);
- StorageDead(_2);
+ nop;
+ nop;
+ nop;
return;
}
}

77
tests/mir-opt/gvn_copy_aggregate.all_copy_ret_2.GVN.diff Normal file
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@ -0,0 +1,77 @@
- // MIR for `all_copy_ret_2` before GVN
+ // MIR for `all_copy_ret_2` after GVN
fn all_copy_ret_2(_1: &AllCopy) -> (AllCopy, AllCopy) {
debug v => _1;
let mut _0: (AllCopy, AllCopy);
let _2: i32;
let mut _5: AllCopy;
let mut _6: i32;
let mut _7: u64;
let mut _8: [i8; 3];
let mut _9: AllCopy;
let mut _10: i32;
let mut _11: u64;
let mut _12: [i8; 3];
scope 1 {
debug a => _2;
let _3: u64;
scope 2 {
debug b => _3;
let _4: [i8; 3];
scope 3 {
debug c => _4;
}
}
}
bb0: {
- StorageLive(_2);
+ nop;
_2 = copy ((*_1).0: i32);
- StorageLive(_3);
+ nop;
_3 = copy ((*_1).1: u64);
- StorageLive(_4);
+ nop;
_4 = copy ((*_1).2: [i8; 3]);
- StorageLive(_5);
+ nop;
StorageLive(_6);
_6 = copy _2;
StorageLive(_7);
_7 = copy _3;
StorageLive(_8);
_8 = copy _4;
- _5 = AllCopy { a: move _6, b: move _7, c: move _8 };
+ _5 = copy (*_1);
StorageDead(_8);
StorageDead(_7);
StorageDead(_6);
StorageLive(_9);
StorageLive(_10);
_10 = copy _2;
StorageLive(_11);
_11 = copy _3;
StorageLive(_12);
_12 = copy _4;
- _9 = AllCopy { a: move _10, b: move _11, c: move _12 };
+ _9 = copy _5;
StorageDead(_12);
StorageDead(_11);
StorageDead(_10);
- _0 = (move _5, move _9);
+ _0 = (copy _5, copy _5);
StorageDead(_9);
- StorageDead(_5);
- StorageDead(_4);
- StorageDead(_3);
- StorageDead(_2);
+ nop;
+ nop;
+ nop;
+ nop;
return;
}
}

57
tests/mir-opt/gvn_copy_aggregate.all_copy_use_changed.GVN.diff Normal file
View File

@ -0,0 +1,57 @@
- // MIR for `all_copy_use_changed` before GVN
+ // MIR for `all_copy_use_changed` after GVN
fn all_copy_use_changed(_1: &mut AllCopy) -> AllCopy {
debug v => _1;
let mut _0: AllCopy;
let mut _2: i32;
let mut _3: i32;
let mut _6: i32;
let mut _7: u64;
let mut _8: [i8; 3];
scope 1 {
debug a => _2;
let _4: u64;
scope 2 {
debug b => _4;
let _5: [i8; 3];
scope 3 {
debug c => _5;
}
}
}
bb0: {
StorageLive(_2);
_2 = copy ((*_1).0: i32);
((*_1).0: i32) = const 1_i32;
StorageLive(_3);
_3 = copy ((*_1).0: i32);
_2 = move _3;
StorageDead(_3);
- StorageLive(_4);
+ nop;
_4 = copy ((*_1).1: u64);
- StorageLive(_5);
+ nop;
_5 = copy ((*_1).2: [i8; 3]);
StorageLive(_6);
_6 = copy _2;
StorageLive(_7);
_7 = copy _4;
StorageLive(_8);
_8 = copy _5;
- _0 = AllCopy { a: move _6, b: move _7, c: move _8 };
+ _0 = AllCopy { a: move _6, b: copy _4, c: copy _5 };
StorageDead(_8);
StorageDead(_7);
StorageDead(_6);
- StorageDead(_5);
- StorageDead(_4);
+ nop;
+ nop;
StorageDead(_2);
return;
}
}

57
tests/mir-opt/gvn_copy_aggregate.all_copy_use_changed_2.GVN.diff Normal file
View File

@ -0,0 +1,57 @@
- // MIR for `all_copy_use_changed_2` before GVN
+ // MIR for `all_copy_use_changed_2` after GVN
fn all_copy_use_changed_2(_1: &mut AllCopy) -> AllCopy {
debug v => _1;
let mut _0: AllCopy;
let mut _2: i32;
let mut _5: i32;
let mut _6: i32;
let mut _7: u64;
let mut _8: [i8; 3];
scope 1 {
debug a => _2;
let _3: u64;
scope 2 {
debug b => _3;
let _4: [i8; 3];
scope 3 {
debug c => _4;
}
}
}
bb0: {
StorageLive(_2);
_2 = copy ((*_1).0: i32);
- StorageLive(_3);
+ nop;
_3 = copy ((*_1).1: u64);
- StorageLive(_4);
+ nop;
_4 = copy ((*_1).2: [i8; 3]);
((*_1).0: i32) = const 1_i32;
StorageLive(_5);
_5 = copy ((*_1).0: i32);
_2 = move _5;
StorageDead(_5);
StorageLive(_6);
_6 = copy _2;
StorageLive(_7);
_7 = copy _3;
StorageLive(_8);
_8 = copy _4;
- _0 = AllCopy { a: move _6, b: move _7, c: move _8 };
+ _0 = AllCopy { a: move _6, b: copy _3, c: copy _4 };
StorageDead(_8);
StorageDead(_7);
StorageDead(_6);
- StorageDead(_4);
- StorageDead(_3);
+ nop;
+ nop;
StorageDead(_2);
return;
}
}

162
tests/mir-opt/gvn_copy_aggregate.enum_different_variant.GVN.diff Normal file
View File

@ -0,0 +1,162 @@
- // MIR for `enum_different_variant` before GVN
+ // MIR for `enum_different_variant` after GVN
fn enum_different_variant(_1: &Enum1) -> Enum1 {
debug v => _1;
let mut _0: Enum1;
let mut _2: isize;
let _3: &AllCopy;
let mut _8: i32;
let mut _9: u64;
let mut _10: [i8; 3];
let mut _11: AllCopy;
let _12: &AllCopy;
let mut _17: i32;
let mut _18: u64;
let mut _19: [i8; 3];
let mut _20: AllCopy;
scope 1 {
debug v => _3;
let _4: i32;
scope 2 {
debug a => _4;
let _5: u64;
scope 3 {
debug b => _5;
let _6: [i8; 3];
scope 4 {
debug c => _6;
let _7: AllCopy;
scope 5 {
debug all_copy => _7;
}
}
}
}
}
scope 6 {
debug v => _12;
let _13: i32;
scope 7 {
debug a => _13;
let _14: u64;
scope 8 {
debug b => _14;
let _15: [i8; 3];
scope 9 {
debug c => _15;
let _16: AllCopy;
scope 10 {
debug all_copy => _16;
}
}
}
}
}
bb0: {
_2 = discriminant((*_1));
switchInt(move _2) -> [0: bb3, 1: bb2, otherwise: bb1];
}
bb1: {
unreachable;
}
bb2: {
StorageLive(_12);
_12 = &(((*_1) as B).0: AllCopy);
- StorageLive(_13);
- _13 = copy ((*_12).0: i32);
- StorageLive(_14);
- _14 = copy ((*_12).1: u64);
- StorageLive(_15);
- _15 = copy ((*_12).2: [i8; 3]);
- StorageLive(_16);
+ nop;
+ _13 = copy ((((*_1) as B).0: AllCopy).0: i32);
+ nop;
+ _14 = copy ((((*_1) as B).0: AllCopy).1: u64);
+ nop;
+ _15 = copy ((((*_1) as B).0: AllCopy).2: [i8; 3]);
+ nop;
StorageLive(_17);
_17 = copy _13;
StorageLive(_18);
_18 = copy _14;
StorageLive(_19);
_19 = copy _15;
- _16 = AllCopy { a: move _17, b: move _18, c: move _19 };
+ _16 = copy (((*_1) as B).0: AllCopy);
StorageDead(_19);
StorageDead(_18);
StorageDead(_17);
StorageLive(_20);
- _20 = move _16;
- _0 = Enum1::A(move _20);
+ _20 = copy _16;
+ _0 = Enum1::A(copy _16);
StorageDead(_20);
- StorageDead(_16);
- StorageDead(_15);
- StorageDead(_14);
- StorageDead(_13);
+ nop;
+ nop;
+ nop;
+ nop;
StorageDead(_12);
goto -> bb4;
}
bb3: {
StorageLive(_3);
_3 = &(((*_1) as A).0: AllCopy);
- StorageLive(_4);
- _4 = copy ((*_3).0: i32);
- StorageLive(_5);
- _5 = copy ((*_3).1: u64);
- StorageLive(_6);
- _6 = copy ((*_3).2: [i8; 3]);
- StorageLive(_7);
+ nop;
+ _4 = copy ((((*_1) as A).0: AllCopy).0: i32);
+ nop;
+ _5 = copy ((((*_1) as A).0: AllCopy).1: u64);
+ nop;
+ _6 = copy ((((*_1) as A).0: AllCopy).2: [i8; 3]);
+ nop;
StorageLive(_8);
_8 = copy _4;
StorageLive(_9);
_9 = copy _5;
StorageLive(_10);
_10 = copy _6;
- _7 = AllCopy { a: move _8, b: move _9, c: move _10 };
+ _7 = copy (((*_1) as A).0: AllCopy);
StorageDead(_10);
StorageDead(_9);
StorageDead(_8);
StorageLive(_11);
- _11 = move _7;
- _0 = Enum1::B(move _11);
+ _11 = copy _7;
+ _0 = Enum1::B(copy _7);
StorageDead(_11);
- StorageDead(_7);
- StorageDead(_6);
- StorageDead(_5);
- StorageDead(_4);
+ nop;
+ nop;
+ nop;
+ nop;
StorageDead(_3);
goto -> bb4;
}
bb4: {
return;
}
}

162
tests/mir-opt/gvn_copy_aggregate.enum_identical_variant.GVN.diff Normal file
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@ -0,0 +1,162 @@
- // MIR for `enum_identical_variant` before GVN
+ // MIR for `enum_identical_variant` after GVN
fn enum_identical_variant(_1: &Enum1) -> Enum1 {
debug v => _1;
let mut _0: Enum1;
let mut _2: isize;
let _3: &AllCopy;
let mut _8: i32;
let mut _9: u64;
let mut _10: [i8; 3];
let mut _11: AllCopy;
let _12: &AllCopy;
let mut _17: i32;
let mut _18: u64;
let mut _19: [i8; 3];
let mut _20: AllCopy;
scope 1 {
debug v => _3;
let _4: i32;
scope 2 {
debug a => _4;
let _5: u64;
scope 3 {
debug b => _5;
let _6: [i8; 3];
scope 4 {
debug c => _6;
let _7: AllCopy;
scope 5 {
debug all_copy => _7;
}
}
}
}
}
scope 6 {
debug v => _12;
let _13: i32;
scope 7 {
debug a => _13;
let _14: u64;
scope 8 {
debug b => _14;
let _15: [i8; 3];
scope 9 {
debug c => _15;
let _16: AllCopy;
scope 10 {
debug all_copy => _16;
}
}
}
}
}
bb0: {
_2 = discriminant((*_1));
switchInt(move _2) -> [0: bb3, 1: bb2, otherwise: bb1];
}
bb1: {
unreachable;
}
bb2: {
StorageLive(_12);
_12 = &(((*_1) as B).0: AllCopy);
- StorageLive(_13);
- _13 = copy ((*_12).0: i32);
- StorageLive(_14);
- _14 = copy ((*_12).1: u64);
- StorageLive(_15);
- _15 = copy ((*_12).2: [i8; 3]);
- StorageLive(_16);
+ nop;
+ _13 = copy ((((*_1) as B).0: AllCopy).0: i32);
+ nop;
+ _14 = copy ((((*_1) as B).0: AllCopy).1: u64);
+ nop;
+ _15 = copy ((((*_1) as B).0: AllCopy).2: [i8; 3]);
+ nop;
StorageLive(_17);
_17 = copy _13;
StorageLive(_18);
_18 = copy _14;
StorageLive(_19);
_19 = copy _15;
- _16 = AllCopy { a: move _17, b: move _18, c: move _19 };
+ _16 = copy (((*_1) as B).0: AllCopy);
StorageDead(_19);
StorageDead(_18);
StorageDead(_17);
StorageLive(_20);
- _20 = move _16;
- _0 = Enum1::B(move _20);
+ _20 = copy _16;
+ _0 = copy (*_1);
StorageDead(_20);
- StorageDead(_16);
- StorageDead(_15);
- StorageDead(_14);
- StorageDead(_13);
+ nop;
+ nop;
+ nop;
+ nop;
StorageDead(_12);
goto -> bb4;
}
bb3: {
StorageLive(_3);
_3 = &(((*_1) as A).0: AllCopy);
- StorageLive(_4);
- _4 = copy ((*_3).0: i32);
- StorageLive(_5);
- _5 = copy ((*_3).1: u64);
- StorageLive(_6);
- _6 = copy ((*_3).2: [i8; 3]);
- StorageLive(_7);
+ nop;
+ _4 = copy ((((*_1) as A).0: AllCopy).0: i32);
+ nop;
+ _5 = copy ((((*_1) as A).0: AllCopy).1: u64);
+ nop;
+ _6 = copy ((((*_1) as A).0: AllCopy).2: [i8; 3]);
+ nop;
StorageLive(_8);
_8 = copy _4;
StorageLive(_9);
_9 = copy _5;
StorageLive(_10);
_10 = copy _6;
- _7 = AllCopy { a: move _8, b: move _9, c: move _10 };
+ _7 = copy (((*_1) as A).0: AllCopy);
StorageDead(_10);
StorageDead(_9);
StorageDead(_8);
StorageLive(_11);
- _11 = move _7;
- _0 = Enum1::A(move _11);
+ _11 = copy _7;
+ _0 = copy (*_1);
StorageDead(_11);
- StorageDead(_7);
- StorageDead(_6);
- StorageDead(_5);
- StorageDead(_4);
+ nop;
+ nop;
+ nop;
+ nop;
StorageDead(_3);
goto -> bb4;
}
bb4: {
return;
}
}

81
tests/mir-opt/gvn_copy_aggregate.nest_copy.GVN.diff Normal file
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@ -0,0 +1,81 @@
- // MIR for `nest_copy` before GVN
+ // MIR for `nest_copy` after GVN
fn nest_copy(_1: &NestCopy) -> NestCopy {
debug v => _1;
let mut _0: NestCopy;
let _2: i32;
let mut _6: i32;
let mut _7: u64;
let mut _8: [i8; 3];
let mut _10: i32;
let mut _11: AllCopy;
scope 1 {
debug a => _2;
let _3: u64;
scope 2 {
debug b => _3;
let _4: [i8; 3];
scope 3 {
debug c => _4;
let _5: AllCopy;
scope 4 {
debug all_copy => _5;
let _9: i32;
scope 5 {
debug d => _9;
}
}
}
}
}
bb0: {
- StorageLive(_2);
+ nop;
_2 = copy (((*_1).1: AllCopy).0: i32);
- StorageLive(_3);
+ nop;
_3 = copy (((*_1).1: AllCopy).1: u64);
- StorageLive(_4);
+ nop;
_4 = copy (((*_1).1: AllCopy).2: [i8; 3]);
- StorageLive(_5);
+ nop;
StorageLive(_6);
_6 = copy _2;
StorageLive(_7);
_7 = copy _3;
StorageLive(_8);
_8 = copy _4;
- _5 = AllCopy { a: move _6, b: move _7, c: move _8 };
+ _5 = copy ((*_1).1: AllCopy);
StorageDead(_8);
StorageDead(_7);
StorageDead(_6);
- StorageLive(_9);
+ nop;
_9 = copy ((*_1).0: i32);
StorageLive(_10);
_10 = copy _9;
StorageLive(_11);
- _11 = move _5;
- _0 = NestCopy { d: move _10, all_copy: move _11 };
+ _11 = copy _5;
+ _0 = copy (*_1);
StorageDead(_11);
StorageDead(_10);
- StorageDead(_9);
- StorageDead(_5);
- StorageDead(_4);
- StorageDead(_3);
- StorageDead(_2);
+ nop;
+ nop;
+ nop;
+ nop;
+ nop;
return;
}
}

54
tests/mir-opt/gvn_copy_aggregate.remove_storage_dead.GVN.diff Normal file
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@ -0,0 +1,54 @@
- // MIR for `remove_storage_dead` before GVN
+ // MIR for `remove_storage_dead` after GVN
fn remove_storage_dead(_1: fn() -> AlwaysSome<T>) -> AlwaysSome<T> {
debug f => _1;
let mut _0: AlwaysSome<T>;
let _2: T;
let mut _3: AlwaysSome<T>;
let mut _4: fn() -> AlwaysSome<T>;
let _5: T;
let mut _6: T;
let mut _7: isize;
let mut _8: isize;
scope 1 {
debug v => _2;
}
scope 2 {
debug v => _5;
}
bb0: {
StorageLive(_2);
- StorageLive(_3);
+ nop;
StorageLive(_4);
_4 = copy _1;
- _3 = move _4() -> [return: bb1, unwind unreachable];
+ _3 = copy _1() -> [return: bb1, unwind unreachable];
}
bb1: {
StorageDead(_4);
- StorageLive(_5);
- _5 = move ((_3 as Some).0: T);
- _2 = move _5;
- StorageDead(_5);
+ nop;
+ _5 = copy ((_3 as Some).0: T);
+ _2 = copy _5;
+ nop;
_7 = discriminant(_3);
- StorageDead(_3);
+ nop;
StorageLive(_6);
- _6 = move _2;
- _0 = AlwaysSome::<T>::Some(move _6);
+ _6 = copy _5;
+ _0 = copy _3;
StorageDead(_6);
StorageDead(_2);
return;
}
}

26
tests/mir-opt/gvn_copy_aggregate.remove_storage_dead_from_index.GVN.diff Normal file
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@ -0,0 +1,26 @@
- // MIR for `remove_storage_dead_from_index` before GVN
+ // MIR for `remove_storage_dead_from_index` after GVN
fn remove_storage_dead_from_index(_1: fn() -> usize, _2: [SameType; 5]) -> SameType {
let mut _0: SameType;
let mut _3: usize;
let mut _4: i32;
let mut _5: i32;
bb0: {
- StorageLive(_3);
+ nop;
_3 = copy _1() -> [return: bb1, unwind unreachable];
}
bb1: {
_4 = copy (_2[_3].0: i32);
_5 = copy (_2[_3].1: i32);
- StorageDead(_3);
- _0 = SameType { a: copy _4, b: copy _5 };
+ nop;
+ _0 = copy _2[_3];
return;
}
}

261
tests/mir-opt/gvn_copy_aggregate.rs Normal file
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@ -0,0 +1,261 @@
//@ test-mir-pass: GVN
//@ compile-flags: -Cpanic=abort
#![feature(core_intrinsics, custom_mir)]
#![allow(internal_features)]
use std::intrinsics::mir::*;
struct AllCopy {
a: i32,
b: u64,
c: [i8; 3],
}
// EMIT_MIR gvn_copy_aggregate.all_copy.GVN.diff
fn all_copy(v: &AllCopy) -> AllCopy {
// CHECK-LABEL: fn all_copy(
// CHECK: bb0: {
// CHECK-NOT: = AllCopy { {{.*}} };
// CHECK: _0 = copy (*_1);
let a = v.a;
let b = v.b;
let c = v.c;
AllCopy { a, b, c }
}
// EMIT_MIR gvn_copy_aggregate.all_copy_2.GVN.diff
fn all_copy_2(v: &&AllCopy) -> AllCopy {
// CHECK-LABEL: fn all_copy_2(
// CHECK: bb0: {
// CHECK-NOT: = AllCopy { {{.*}} };
// CHECK: [[V1:_.*]] = copy (*_1);
// CHECK: _0 = copy (*[[V1]]);
let a = v.a;
let b = v.b;
let c = v.c;
AllCopy { a, b, c }
}
// EMIT_MIR gvn_copy_aggregate.all_copy_move.GVN.diff
fn all_copy_move(v: AllCopy) -> AllCopy {
// CHECK-LABEL: fn all_copy_move(
// CHECK: bb0: {
// CHECK-NOT: = AllCopy { {{.*}} };
// CHECK: _0 = copy _1;
let a = v.a;
let b = v.b;
let c = v.c;
AllCopy { a, b, c }
}
// EMIT_MIR gvn_copy_aggregate.all_copy_ret_2.GVN.diff
fn all_copy_ret_2(v: &AllCopy) -> (AllCopy, AllCopy) {
// CHECK-LABEL: fn all_copy_ret_2(
// CHECK: bb0: {
// CHECK-NOT: = AllCopy { {{.*}} };
// CHECK: [[V1:_.*]] = copy (*_1);
// CHECK: [[V2:_.*]] = copy [[V1]];
// CHECK: _0 = (copy [[V1]], copy [[V1]]);
let a = v.a;
let b = v.b;
let c = v.c;
(AllCopy { a, b, c }, AllCopy { a, b, c })
}
struct AllCopy2 {
a: i32,
b: u64,
c: [i8; 3],
}
// EMIT_MIR gvn_copy_aggregate.all_copy_different_type.GVN.diff
fn all_copy_different_type(v: &AllCopy) -> AllCopy2 {
// CHECK-LABEL: fn all_copy_different_type(
// CHECK: bb0: {
// CHECK: _0 = AllCopy2 { {{.*}} };
let a = v.a;
let b = v.b;
let c = v.c;
AllCopy2 { a, b, c }
}
struct SameType {
a: i32,
b: i32,
}
// EMIT_MIR gvn_copy_aggregate.same_type_different_index.GVN.diff
fn same_type_different_index(v: &SameType) -> SameType {
// CHECK-LABEL: fn same_type_different_index(
// CHECK: bb0: {
// CHECK: _0 = SameType { {{.*}} };
let a = v.b;
let b = v.a;
SameType { a, b }
}
// EMIT_MIR gvn_copy_aggregate.all_copy_has_changed.GVN.diff
fn all_copy_has_changed(v: &mut AllCopy) -> AllCopy {
// CHECK-LABEL: fn all_copy_has_changed(
// CHECK: bb0: {
// CHECK: _0 = AllCopy { {{.*}} };
let a = v.a;
let b = v.b;
let c = v.c;
v.a = 1;
AllCopy { a, b, c }
}
// FIXME: This can be simplified to `Copy`.
// EMIT_MIR gvn_copy_aggregate.all_copy_use_changed.GVN.diff
fn all_copy_use_changed(v: &mut AllCopy) -> AllCopy {
// CHECK-LABEL: fn all_copy_use_changed(
// CHECK: bb0: {
// CHECK-NOT: _0 = copy (*_1);
// CHECK: = AllCopy { {{.*}} };
let mut a = v.a;
v.a = 1;
a = v.a;
let b = v.b;
let c = v.c;
AllCopy { a, b, c }
}
// FIXME: This can be simplified to `Copy`.
// EMIT_MIR gvn_copy_aggregate.all_copy_use_changed_2.GVN.diff
fn all_copy_use_changed_2(v: &mut AllCopy) -> AllCopy {
// CHECK-LABEL: fn all_copy_use_changed_2(
// CHECK: bb0: {
// CHECK-NOT: _0 = (*_1);
// CHECK: = AllCopy { {{.*}} };
let mut a = v.a;
let b = v.b;
let c = v.c;
v.a = 1;
a = v.a;
AllCopy { a, b, c }
}
struct NestCopy {
d: i32,
all_copy: AllCopy,
}
// EMIT_MIR gvn_copy_aggregate.nest_copy.GVN.diff
fn nest_copy(v: &NestCopy) -> NestCopy {
// CHECK-LABEL: fn nest_copy(
// CHECK: bb0: {
// CHECK-NOT: = AllCopy { {{.*}} };
// CHECK-NOT: = NestCopy { {{.*}} };
let a = v.all_copy.a;
let b = v.all_copy.b;
let c = v.all_copy.c;
let all_copy = AllCopy { a, b, c };
let d = v.d;
NestCopy { d, all_copy }
}
enum Enum1 {
A(AllCopy),
B(AllCopy),
}
// EMIT_MIR gvn_copy_aggregate.enum_identical_variant.GVN.diff
fn enum_identical_variant(v: &Enum1) -> Enum1 {
// CHECK-LABEL: fn enum_identical_variant(
// CHECK-NOT: = AllCopy { {{.*}} };
// CHECK: _0 = copy (*_1);
// CHECK-NOT: = AllCopy { {{.*}} };
// CHECK: _0 = copy (*_1);
match v {
Enum1::A(v) => {
let a = v.a;
let b = v.b;
let c = v.c;
let all_copy = AllCopy { a, b, c };
Enum1::A(all_copy)
}
Enum1::B(v) => {
let a = v.a;
let b = v.b;
let c = v.c;
let all_copy = AllCopy { a, b, c };
Enum1::B(all_copy)
}
}
}
// EMIT_MIR gvn_copy_aggregate.enum_different_variant.GVN.diff
fn enum_different_variant(v: &Enum1) -> Enum1 {
// CHECK-LABEL: fn enum_different_variant(
// CHECK-NOT: = AllCopy { {{.*}} };
// CHECK: [[V1:_.*]] = copy (((*_1) as [[VARIANT1:.*]]).0: AllCopy);
// CHECK: _0 = Enum1::[[VARIANT2:.*]](copy [[V1]]);
// CHECK-NOT: = AllCopy { {{.*}} };
// CHECK: [[V2:_.*]] = copy (((*_1) as [[VARIANT2]]).0: AllCopy);
// CHECK: _0 = Enum1::[[VARIANT1]](copy [[V2]]);
match v {
Enum1::A(v) => {
let a = v.a;
let b = v.b;
let c = v.c;
let all_copy = AllCopy { a, b, c };
Enum1::B(all_copy)
}
Enum1::B(v) => {
let a = v.a;
let b = v.b;
let c = v.c;
let all_copy = AllCopy { a, b, c };
Enum1::A(all_copy)
}
}
}
enum AlwaysSome<T> {
Some(T),
}
// Ensure that we do not access this local after `StorageDead`.
// EMIT_MIR gvn_copy_aggregate.remove_storage_dead.GVN.diff
fn remove_storage_dead<T>(f: fn() -> AlwaysSome<T>) -> AlwaysSome<T> {
// CHECK-LABEL: fn remove_storage_dead(
// CHECK: [[V1:_.*]] = copy _1() -> [return: [[BB1:bb.*]],
// CHECK: [[BB1]]: {
// CHECK-NOT: StorageDead([[V1]]);
// CHECK: _0 = copy [[V1]];
let v = {
match f() {
AlwaysSome::Some(v) => v,
}
};
AlwaysSome::Some(v)
}
// EMIT_MIR gvn_copy_aggregate.remove_storage_dead_from_index.GVN.diff
#[custom_mir(dialect = "analysis")]
fn remove_storage_dead_from_index(f: fn() -> usize, v: [SameType; 5]) -> SameType {
// CHECK-LABEL: fn remove_storage_dead_from_index(
// CHECK: [[V1:_.*]] = copy _1() -> [return: [[BB1:bb.*]],
// CHECK: [[BB1]]: {
// CHECK-NOT: StorageDead([[V1]]);
// CHECK-NOT: = SameType { {{.*}} };
// CHECK: _0 = copy _2[[[V1]]];
mir! {
let index: usize;
let a: i32;
let b: i32;
{
StorageLive(index);
Call(index = f(), ReturnTo(bb1), UnwindUnreachable())
}
bb1 = {
a = v[index].a;
b = v[index].b;
StorageDead(index);
RET = SameType { a, b };
Return()
}
}
}

40
tests/mir-opt/gvn_copy_aggregate.same_type_different_index.GVN.diff Normal file
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@ -0,0 +1,40 @@
- // MIR for `same_type_different_index` before GVN
+ // MIR for `same_type_different_index` after GVN
fn same_type_different_index(_1: &SameType) -> SameType {
debug v => _1;
let mut _0: SameType;
let _2: i32;
let mut _4: i32;
let mut _5: i32;
scope 1 {
debug a => _2;
let _3: i32;
scope 2 {
debug b => _3;
}
}
bb0: {
- StorageLive(_2);
+ nop;
_2 = copy ((*_1).1: i32);
- StorageLive(_3);
+ nop;
_3 = copy ((*_1).0: i32);
StorageLive(_4);
_4 = copy _2;
StorageLive(_5);
_5 = copy _3;
- _0 = SameType { a: move _4, b: move _5 };
+ _0 = SameType { a: copy _2, b: copy _3 };
StorageDead(_5);
StorageDead(_4);
- StorageDead(_3);
- StorageDead(_2);
+ nop;
+ nop;
return;
}
}

21
tests/mir-opt/pre-codegen/clone_as_copy.clone_as_copy.PreCodegen.after.mir Normal file
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@ -0,0 +1,21 @@
// MIR for `clone_as_copy` after PreCodegen
fn clone_as_copy(_1: &NestCopy) -> NestCopy {
debug v => _1;
let mut _0: NestCopy;
scope 1 (inlined <NestCopy as Clone>::clone) {
debug self => _1;
let _2: &AllCopy;
scope 2 (inlined <AllCopy as Clone>::clone) {
debug self => _2;
}
}
bb0: {
StorageLive(_2);
_2 = &((*_1).1: AllCopy);
_0 = copy (*_1);
StorageDead(_2);
return;
}
}

62
tests/mir-opt/pre-codegen/clone_as_copy.enum_clone_as_copy.PreCodegen.after.mir Normal file
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@ -0,0 +1,62 @@
// MIR for `enum_clone_as_copy` after PreCodegen
fn enum_clone_as_copy(_1: &Enum1) -> Enum1 {
debug v => _1;
let mut _0: Enum1;
scope 1 (inlined <Enum1 as Clone>::clone) {
debug self => _1;
let mut _2: isize;
let mut _3: &AllCopy;
let mut _4: &NestCopy;
scope 2 {
debug __self_0 => _3;
scope 6 (inlined <AllCopy as Clone>::clone) {
debug self => _3;
}
}
scope 3 {
debug __self_0 => _4;
scope 4 (inlined <NestCopy as Clone>::clone) {
debug self => _4;
let _5: &AllCopy;
scope 5 (inlined <AllCopy as Clone>::clone) {
debug self => _5;
}
}
}
}
bb0: {
StorageLive(_2);
StorageLive(_3);
StorageLive(_4);
_2 = discriminant((*_1));
switchInt(move _2) -> [0: bb1, 1: bb2, otherwise: bb4];
}
bb1: {
_3 = &(((*_1) as A).0: AllCopy);
_0 = copy (*_1);
goto -> bb3;
}
bb2: {
_4 = &(((*_1) as B).0: NestCopy);
StorageLive(_5);
_5 = &((((*_1) as B).0: NestCopy).1: AllCopy);
StorageDead(_5);
_0 = copy (*_1);
goto -> bb3;
}
bb3: {
StorageDead(_4);
StorageDead(_3);
StorageDead(_2);
return;
}
bb4: {
unreachable;
}
}

43
tests/mir-opt/pre-codegen/clone_as_copy.rs Normal file
View File

@ -0,0 +1,43 @@
//@ compile-flags: -Cdebuginfo=full
// Check if we have transformed the nested clone to the copy in the complete pipeline.
#[derive(Clone)]
struct AllCopy {
a: i32,
b: u64,
c: [i8; 3],
}
#[derive(Clone)]
struct NestCopy {
a: i32,
b: AllCopy,
c: [i8; 3],
}
#[derive(Clone)]
enum Enum1 {
A(AllCopy),
B(NestCopy),
}
// EMIT_MIR clone_as_copy.clone_as_copy.PreCodegen.after.mir
fn clone_as_copy(v: &NestCopy) -> NestCopy {
// CHECK-LABEL: fn clone_as_copy(
// CHECK-NOT: = AllCopy { {{.*}} };
// CHECK-NOT: = NestCopy { {{.*}} };
// CHECK: _0 = copy (*_1);
// CHECK: return;
v.clone()
}
// FIXME: We can merge into exactly one assignment statement.
// EMIT_MIR clone_as_copy.enum_clone_as_copy.PreCodegen.after.mir
fn enum_clone_as_copy(v: &Enum1) -> Enum1 {
// CHECK-LABEL: fn enum_clone_as_copy(
// CHECK-NOT: = Enum1::
// CHECK: _0 = copy (*_1);
// CHECK: _0 = copy (*_1);
v.clone()
}

6
tests/mir-opt/pre-codegen/no_inlined_clone.{impl#0}-clone.PreCodegen.after.mir
View File

@ -3,13 +3,9 @@
fn <impl at $DIR/no_inlined_clone.rs:9:10: 9:15>::clone(_1: &Foo) -> Foo {
debug self => _1;
let mut _0: Foo;
let mut _2: i32;
bb0: {
StorageLive(_2);
_2 = copy ((*_1).0: i32);
_0 = Foo { a: move _2 };
StorageDead(_2);
_0 = copy (*_1);
return;
}
}

8
tests/mir-opt/pre-codegen/try_identity.old.PreCodegen.after.mir
View File

@ -19,14 +19,14 @@ fn old(_1: Result<T, E>) -> Result<T, E> {
}
bb1: {
_3 = move ((_1 as Ok).0: T);
_0 = Result::<T, E>::Ok(copy _3);
_3 = copy ((_1 as Ok).0: T);
_0 = copy _1;
goto -> bb3;
}
bb2: {
_4 = move ((_1 as Err).0: E);
_0 = Result::<T, E>::Err(copy _4);
_4 = copy ((_1 as Err).0: E);
_0 = copy _1;
goto -> bb3;
}

34
tests/mir-opt/pre-codegen/vec_deref.vec_deref_to_slice.PreCodegen.after.panic-abort.mir
View File

@ -5,7 +5,7 @@ fn vec_deref_to_slice(_1: &Vec<u8>) -> &[u8] {
let mut _0: &[u8];
scope 1 (inlined <Vec<u8> as Deref>::deref) {
debug self => _1;
let mut _7: usize;
let mut _6: usize;
scope 2 (inlined Vec::<u8>::as_ptr) {
debug self => _1;
let mut _2: &alloc::raw_vec::RawVec<u8>;
@ -14,7 +14,6 @@ fn vec_deref_to_slice(_1: &Vec<u8>) -> &[u8] {
let mut _3: &alloc::raw_vec::RawVecInner;
scope 4 (inlined alloc::raw_vec::RawVecInner::ptr::<u8>) {
debug self => _3;
let mut _6: std::ptr::NonNull<u8>;
scope 5 (inlined alloc::raw_vec::RawVecInner::non_null::<u8>) {
debug self => _3;
let mut _4: std::ptr::NonNull<u8>;
@ -30,28 +29,28 @@ fn vec_deref_to_slice(_1: &Vec<u8>) -> &[u8] {
}
}
scope 9 (inlined #[track_caller] <Unique<u8> as Into<NonNull<u8>>>::into) {
debug ((self: Unique<u8>).0: std::ptr::NonNull<u8>) => _6;
debug ((self: Unique<u8>).0: std::ptr::NonNull<u8>) => _4;
debug ((self: Unique<u8>).1: std::marker::PhantomData<u8>) => const PhantomData::<u8>;
scope 10 (inlined <NonNull<u8> as From<Unique<u8>>>::from) {
debug ((unique: Unique<u8>).0: std::ptr::NonNull<u8>) => _6;
debug ((unique: Unique<u8>).0: std::ptr::NonNull<u8>) => _4;
debug ((unique: Unique<u8>).1: std::marker::PhantomData<u8>) => const PhantomData::<u8>;
scope 11 (inlined Unique::<u8>::as_non_null_ptr) {
debug ((self: Unique<u8>).0: std::ptr::NonNull<u8>) => _6;
debug ((self: Unique<u8>).0: std::ptr::NonNull<u8>) => _4;
debug ((self: Unique<u8>).1: std::marker::PhantomData<u8>) => const PhantomData::<u8>;
}
}
}
}
scope 12 (inlined NonNull::<u8>::as_ptr) {
debug self => _6;
debug self => _4;
}
}
}
}
scope 13 (inlined std::slice::from_raw_parts::<'_, u8>) {
debug data => _5;
debug len => _7;
let _8: *const [u8];
debug len => _6;
let _7: *const [u8];
scope 14 (inlined core::ub_checks::check_language_ub) {
scope 15 (inlined core::ub_checks::check_language_ub::runtime) {
}
@ -62,10 +61,10 @@ fn vec_deref_to_slice(_1: &Vec<u8>) -> &[u8] {
}
scope 18 (inlined slice_from_raw_parts::<u8>) {
debug data => _5;
debug len => _7;
debug len => _6;
scope 19 (inlined std::ptr::from_raw_parts::<[u8], u8>) {
debug data_pointer => _5;
debug metadata => _7;
debug metadata => _6;
}
}
}
@ -76,22 +75,17 @@ fn vec_deref_to_slice(_1: &Vec<u8>) -> &[u8] {
_2 = &((*_1).0: alloc::raw_vec::RawVec<u8>);
StorageLive(_3);
_3 = &(((*_1).0: alloc::raw_vec::RawVec<u8>).0: alloc::raw_vec::RawVecInner);
StorageLive(_6);
StorageLive(_4);
_4 = copy (((((*_1).0: alloc::raw_vec::RawVec<u8>).0: alloc::raw_vec::RawVecInner).0: std::ptr::Unique<u8>).0: std::ptr::NonNull<u8>);
_5 = copy (_4.0: *const u8);
_6 = NonNull::<u8> { pointer: copy _5 };
StorageDead(_4);
StorageDead(_6);
StorageDead(_3);
StorageDead(_2);
StorageLive(_6);
_6 = copy ((*_1).1: usize);
StorageLive(_7);
_7 = copy ((*_1).1: usize);
StorageLive(_8);
_8 = *const [u8] from (copy _5, copy _7);
_0 = &(*_8);
StorageDead(_8);
_7 = *const [u8] from (copy _5, copy _6);
_0 = &(*_7);
StorageDead(_7);
StorageDead(_6);
return;
}
}

34
tests/mir-opt/pre-codegen/vec_deref.vec_deref_to_slice.PreCodegen.after.panic-unwind.mir
View File

@ -5,7 +5,7 @@ fn vec_deref_to_slice(_1: &Vec<u8>) -> &[u8] {
let mut _0: &[u8];
scope 1 (inlined <Vec<u8> as Deref>::deref) {
debug self => _1;
let mut _7: usize;
let mut _6: usize;
scope 2 (inlined Vec::<u8>::as_ptr) {
debug self => _1;
let mut _2: &alloc::raw_vec::RawVec<u8>;
@ -14,7 +14,6 @@ fn vec_deref_to_slice(_1: &Vec<u8>) -> &[u8] {
let mut _3: &alloc::raw_vec::RawVecInner;
scope 4 (inlined alloc::raw_vec::RawVecInner::ptr::<u8>) {
debug self => _3;
let mut _6: std::ptr::NonNull<u8>;
scope 5 (inlined alloc::raw_vec::RawVecInner::non_null::<u8>) {
debug self => _3;
let mut _4: std::ptr::NonNull<u8>;
@ -30,28 +29,28 @@ fn vec_deref_to_slice(_1: &Vec<u8>) -> &[u8] {
}
}
scope 9 (inlined #[track_caller] <Unique<u8> as Into<NonNull<u8>>>::into) {
debug ((self: Unique<u8>).0: std::ptr::NonNull<u8>) => _6;
debug ((self: Unique<u8>).0: std::ptr::NonNull<u8>) => _4;
debug ((self: Unique<u8>).1: std::marker::PhantomData<u8>) => const PhantomData::<u8>;
scope 10 (inlined <NonNull<u8> as From<Unique<u8>>>::from) {
debug ((unique: Unique<u8>).0: std::ptr::NonNull<u8>) => _6;
debug ((unique: Unique<u8>).0: std::ptr::NonNull<u8>) => _4;
debug ((unique: Unique<u8>).1: std::marker::PhantomData<u8>) => const PhantomData::<u8>;
scope 11 (inlined Unique::<u8>::as_non_null_ptr) {
debug ((self: Unique<u8>).0: std::ptr::NonNull<u8>) => _6;
debug ((self: Unique<u8>).0: std::ptr::NonNull<u8>) => _4;
debug ((self: Unique<u8>).1: std::marker::PhantomData<u8>) => const PhantomData::<u8>;
}
}
}
}
scope 12 (inlined NonNull::<u8>::as_ptr) {
debug self => _6;
debug self => _4;
}
}
}
}
scope 13 (inlined std::slice::from_raw_parts::<'_, u8>) {
debug data => _5;
debug len => _7;
let _8: *const [u8];
debug len => _6;
let _7: *const [u8];
scope 14 (inlined core::ub_checks::check_language_ub) {
scope 15 (inlined core::ub_checks::check_language_ub::runtime) {
}
@ -62,10 +61,10 @@ fn vec_deref_to_slice(_1: &Vec<u8>) -> &[u8] {
}
scope 18 (inlined slice_from_raw_parts::<u8>) {
debug data => _5;
debug len => _7;
debug len => _6;
scope 19 (inlined std::ptr::from_raw_parts::<[u8], u8>) {
debug data_pointer => _5;
debug metadata => _7;
debug metadata => _6;
}
}
}
@ -76,22 +75,17 @@ fn vec_deref_to_slice(_1: &Vec<u8>) -> &[u8] {
_2 = &((*_1).0: alloc::raw_vec::RawVec<u8>);
StorageLive(_3);
_3 = &(((*_1).0: alloc::raw_vec::RawVec<u8>).0: alloc::raw_vec::RawVecInner);
StorageLive(_6);
StorageLive(_4);
_4 = copy (((((*_1).0: alloc::raw_vec::RawVec<u8>).0: alloc::raw_vec::RawVecInner).0: std::ptr::Unique<u8>).0: std::ptr::NonNull<u8>);
_5 = copy (_4.0: *const u8);
_6 = NonNull::<u8> { pointer: copy _5 };
StorageDead(_4);
StorageDead(_6);
StorageDead(_3);
StorageDead(_2);
StorageLive(_6);
_6 = copy ((*_1).1: usize);
StorageLive(_7);
_7 = copy ((*_1).1: usize);
StorageLive(_8);
_8 = *const [u8] from (copy _5, copy _7);
_0 = &(*_8);
StorageDead(_8);
_7 = *const [u8] from (copy _5, copy _6);
_0 = &(*_7);
StorageDead(_7);
StorageDead(_6);
return;
}
}