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Remove SimplifyBranchSame MIR optimization #77706

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Remove SimplifyBranchSame MIR optimization #77706

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1 change: 0 additions & 1 deletion compiler/rustc_mir/src/transform/mod.rs
View file
Original file line number Diff line number Diff line change
@@ -403,7 +403,6 @@ fn run_optimization_passes<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
&early_otherwise_branch::EarlyOtherwiseBranch,
&simplify_comparison_integral::SimplifyComparisonIntegral,
&simplify_try::SimplifyArmIdentity,
&simplify_try::SimplifyBranchSame,
&dest_prop::DestinationPropagation,
&copy_prop::CopyPropagation,
&simplify_branches::SimplifyBranches::new("after-copy-prop"),
269 changes: 3 additions & 266 deletions compiler/rustc_mir/src/transform/simplify_try.rs
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Original file line number Diff line number Diff line change
@@ -9,14 +9,13 @@
//!
//! into just `x`.
use crate::transform::{simplify, MirPass};
use itertools::Itertools as _;
use crate::transform::MirPass;
use rustc_index::{bit_set::BitSet, vec::IndexVec};
use rustc_middle::mir::visit::{NonUseContext, PlaceContext, Visitor};
use rustc_middle::mir::*;
use rustc_middle::ty::{self, List, Ty, TyCtxt};
use rustc_middle::ty::{List, Ty, TyCtxt};
use rustc_target::abi::VariantIdx;
use std::iter::{once, Enumerate, Peekable};
use std::iter::{Enumerate, Peekable};
use std::slice::Iter;

/// Simplifies arms of form `Variant(x) => Variant(x)` to just a move.
@@ -523,265 +522,3 @@ fn match_variant_field_place<'tcx>(place: Place<'tcx>) -> Option<(Local, VarFiel
_ => None,
}
}

/// Simplifies `SwitchInt(_) -> [targets]`,
/// where all the `targets` have the same form,
/// into `goto -> target_first`.
pub struct SimplifyBranchSame;

impl<'tcx> MirPass<'tcx> for SimplifyBranchSame {
fn run_pass(&self, tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
trace!("Running SimplifyBranchSame on {:?}", body.source);
let finder = SimplifyBranchSameOptimizationFinder { body, tcx };
let opts = finder.find();

let did_remove_blocks = opts.len() > 0;
for opt in opts.iter() {
trace!("SUCCESS: Applying optimization {:?}", opt);
// Replace `SwitchInt(..) -> [bb_first, ..];` with a `goto -> bb_first;`.
body.basic_blocks_mut()[opt.bb_to_opt_terminator].terminator_mut().kind =
TerminatorKind::Goto { target: opt.bb_to_goto };
}

if did_remove_blocks {
// We have dead blocks now, so remove those.
simplify::remove_dead_blocks(body);
}
}
}

#[derive(Debug)]
struct SimplifyBranchSameOptimization {
/// All basic blocks are equal so go to this one
bb_to_goto: BasicBlock,
/// Basic block where the terminator can be simplified to a goto
bb_to_opt_terminator: BasicBlock,
}

struct SwitchTargetAndValue {
target: BasicBlock,
// None in case of the `otherwise` case
value: Option<u128>,
}

struct SimplifyBranchSameOptimizationFinder<'a, 'tcx> {
body: &'a Body<'tcx>,
tcx: TyCtxt<'tcx>,
}

impl<'a, 'tcx> SimplifyBranchSameOptimizationFinder<'a, 'tcx> {
fn find(&self) -> Vec<SimplifyBranchSameOptimization> {
self.body
.basic_blocks()
.iter_enumerated()
.filter_map(|(bb_idx, bb)| {
let (discr_switched_on, targets_and_values) = match &bb.terminator().kind {
TerminatorKind::SwitchInt { targets, discr, values, .. } => {
// if values.len() == targets.len() - 1, we need to include None where no value is present
// such that the zip does not throw away targets. If no `otherwise` case is in targets, the zip will simply throw away the added None
let values_extended = values.iter().map(|x|Some(*x)).chain(once(None));
let targets_and_values:Vec<_> = targets.iter().zip(values_extended)
.map(|(target, value)| SwitchTargetAndValue{target:*target, value})
.collect();
assert_eq!(targets.len(), targets_and_values.len());
(discr, targets_and_values)},
_ => return None,
};

// find the adt that has its discriminant read
// assuming this must be the last statement of the block
let adt_matched_on = match &bb.statements.last()?.kind {
StatementKind::Assign(box (place, rhs))
if Some(*place) == discr_switched_on.place() =>
{
match rhs {
Rvalue::Discriminant(adt_place) if adt_place.ty(self.body, self.tcx).ty.is_enum() => adt_place,
_ => {
trace!("NO: expected a discriminant read of an enum instead of: {:?}", rhs);
return None;
}
}
}
other => {
trace!("NO: expected an assignment of a discriminant read to a place. Found: {:?}", other);
return None
},
};

let mut iter_bbs_reachable = targets_and_values
.iter()
.map(|target_and_value| (target_and_value, &self.body.basic_blocks()[target_and_value.target]))
.filter(|(_, bb)| {
// Reaching `unreachable` is UB so assume it doesn't happen.
bb.terminator().kind != TerminatorKind::Unreachable
// But `asm!(...)` could abort the program,
// so we cannot assume that the `unreachable` terminator itself is reachable.
// FIXME(Centril): use a normalization pass instead of a check.
|| bb.statements.iter().any(|stmt| match stmt.kind {
StatementKind::LlvmInlineAsm(..) => true,
_ => false,
})
})
.peekable();

let bb_first = iter_bbs_reachable.peek().map(|(idx, _)| *idx).unwrap_or(&targets_and_values[0]);
let mut all_successors_equivalent = StatementEquality::TrivialEqual;

// All successor basic blocks must be equal or contain statements that are pairwise considered equal.
for ((target_and_value_l,bb_l), (target_and_value_r,bb_r)) in iter_bbs_reachable.tuple_windows() {
let trivial_checks = bb_l.is_cleanup == bb_r.is_cleanup
&& bb_l.terminator().kind == bb_r.terminator().kind
&& bb_l.statements.len() == bb_r.statements.len();
let statement_check = || {
bb_l.statements.iter().zip(&bb_r.statements).try_fold(StatementEquality::TrivialEqual, |acc,(l,r)| {
let stmt_equality = self.statement_equality(*adt_matched_on, &l, target_and_value_l, &r, target_and_value_r);
if matches!(stmt_equality, StatementEquality::NotEqual) {
// short circuit
None
} else {
Some(acc.combine(&stmt_equality))
}
})
.unwrap_or(StatementEquality::NotEqual)
};
if !trivial_checks {
all_successors_equivalent = StatementEquality::NotEqual;
break;
}
all_successors_equivalent = all_successors_equivalent.combine(&statement_check());
};

match all_successors_equivalent{
StatementEquality::TrivialEqual => {
// statements are trivially equal, so just take first
trace!("Statements are trivially equal");
Some(SimplifyBranchSameOptimization {
bb_to_goto: bb_first.target,
bb_to_opt_terminator: bb_idx,
})
}
StatementEquality::ConsideredEqual(bb_to_choose) => {
trace!("Statements are considered equal");
Some(SimplifyBranchSameOptimization {
bb_to_goto: bb_to_choose,
bb_to_opt_terminator: bb_idx,
})
}
StatementEquality::NotEqual => {
trace!("NO: not all successors of basic block {:?} were equivalent", bb_idx);
None
}
}
})
.collect()
}

/// Tests if two statements can be considered equal
///
/// Statements can be trivially equal if the kinds match.
/// But they can also be considered equal in the following case A:
/// ```
/// discriminant(_0) = 0; // bb1
/// _0 = move _1; // bb2
/// ```
/// In this case the two statements are equal iff
/// 1: _0 is an enum where the variant index 0 is fieldless, and
/// 2: bb1 was targeted by a switch where the discriminant of _1 was switched on
fn statement_equality(
&self,
adt_matched_on: Place<'tcx>,
x: &Statement<'tcx>,
x_target_and_value: &SwitchTargetAndValue,
y: &Statement<'tcx>,
y_target_and_value: &SwitchTargetAndValue,
) -> StatementEquality {
let helper = |rhs: &Rvalue<'tcx>,
place: &Place<'tcx>,
variant_index: &VariantIdx,
side_to_choose| {
let place_type = place.ty(self.body, self.tcx).ty;
let adt = match *place_type.kind() {
ty::Adt(adt, _) if adt.is_enum() => adt,
_ => return StatementEquality::NotEqual,
};
let variant_is_fieldless = adt.variants[*variant_index].fields.is_empty();
if !variant_is_fieldless {
trace!("NO: variant {:?} was not fieldless", variant_index);
return StatementEquality::NotEqual;
}

match rhs {
Rvalue::Use(operand) if operand.place() == Some(adt_matched_on) => {
StatementEquality::ConsideredEqual(side_to_choose)
}
_ => {
trace!(
"NO: RHS of assignment was {:?}, but expected it to match the adt being matched on in the switch, which is {:?}",
rhs,
adt_matched_on
);
StatementEquality::NotEqual
}
}
};
match (&x.kind, &y.kind) {
// trivial case
(x, y) if x == y => StatementEquality::TrivialEqual,

// check for case A
(
StatementKind::Assign(box (_, rhs)),
StatementKind::SetDiscriminant { place, variant_index },
)
// we need to make sure that the switch value that targets the bb with SetDiscriminant (y), is the same as the variant index
if Some(variant_index.index() as u128) == y_target_and_value.value => {
// choose basic block of x, as that has the assign
helper(rhs, place, variant_index, x_target_and_value.target)
}
(
StatementKind::SetDiscriminant { place, variant_index },
StatementKind::Assign(box (_, rhs)),
)
// we need to make sure that the switch value that targets the bb with SetDiscriminant (x), is the same as the variant index
if Some(variant_index.index() as u128) == x_target_and_value.value => {
// choose basic block of y, as that has the assign
helper(rhs, place, variant_index, y_target_and_value.target)
}
_ => {
trace!("NO: statements `{:?}` and `{:?}` not considered equal", x, y);
StatementEquality::NotEqual
}
}
}
}

#[derive(Copy, Clone, Eq, PartialEq)]
enum StatementEquality {
/// The two statements are trivially equal; same kind
TrivialEqual,
/// The two statements are considered equal, but may be of different kinds. The BasicBlock field is the basic block to jump to when performing the branch-same optimization.
/// For example, `_0 = _1` and `discriminant(_0) = discriminant(0)` are considered equal if 0 is a fieldless variant of an enum. But we don't want to jump to the basic block with the SetDiscriminant, as that is not legal if _1 is not the 0 variant index
ConsideredEqual(BasicBlock),
/// The two statements are not equal
NotEqual,
}

impl StatementEquality {
fn combine(&self, other: &StatementEquality) -> StatementEquality {
use StatementEquality::*;
match (self, other) {
(TrivialEqual, TrivialEqual) => TrivialEqual,
(TrivialEqual, ConsideredEqual(b)) | (ConsideredEqual(b), TrivialEqual) => {
ConsideredEqual(*b)
}
(ConsideredEqual(b1), ConsideredEqual(b2)) => {
if b1 == b2 {
ConsideredEqual(*b1)
} else {
NotEqual
}
}
(_, NotEqual) | (NotEqual, _) => NotEqual,
}
}
}
17 changes: 0 additions & 17 deletions src/test/codegen/try_identity.rs
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28 changes: 0 additions & 28 deletions src/test/mir-opt/76803_regression.encode.SimplifyBranchSame.diff
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19 changes: 0 additions & 19 deletions src/test/mir-opt/76803_regression.rs
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This file was deleted.

3 changes: 0 additions & 3 deletions src/test/mir-opt/simplify-arm.rs
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Original file line number Diff line number Diff line change
@@ -1,10 +1,7 @@
// compile-flags: -Z mir-opt-level=2 -Zunsound-mir-opts
// EMIT_MIR simplify_arm.id.SimplifyArmIdentity.diff
// EMIT_MIR simplify_arm.id.SimplifyBranchSame.diff
// EMIT_MIR simplify_arm.id_result.SimplifyArmIdentity.diff
// EMIT_MIR simplify_arm.id_result.SimplifyBranchSame.diff
// EMIT_MIR simplify_arm.id_try.SimplifyArmIdentity.diff
// EMIT_MIR simplify_arm.id_try.SimplifyBranchSame.diff

fn id(o: Option<u8>) -> Option<u8> {
match o {
46 changes: 23 additions & 23 deletions src/test/mir-opt/simplify_arm.id.SimplifyArmIdentity.diff
View file
Original file line number Diff line number Diff line change
@@ -2,45 +2,45 @@
+ // MIR for `id` after SimplifyArmIdentity

fn id(_1: Option<u8>) -> Option<u8> {
debug o => _1; // in scope 0 at $DIR/simplify-arm.rs:9:7: 9:8
let mut _0: std::option::Option<u8>; // return place in scope 0 at $DIR/simplify-arm.rs:9:25: 9:35
let mut _2: isize; // in scope 0 at $DIR/simplify-arm.rs:11:9: 11:16
let _3: u8; // in scope 0 at $DIR/simplify-arm.rs:11:14: 11:15
let mut _4: u8; // in scope 0 at $DIR/simplify-arm.rs:11:25: 11:26
debug o => _1; // in scope 0 at $DIR/simplify-arm.rs:6:7: 6:8
let mut _0: std::option::Option<u8>; // return place in scope 0 at $DIR/simplify-arm.rs:6:25: 6:35
let mut _2: isize; // in scope 0 at $DIR/simplify-arm.rs:8:9: 8:16
let _3: u8; // in scope 0 at $DIR/simplify-arm.rs:8:14: 8:15
let mut _4: u8; // in scope 0 at $DIR/simplify-arm.rs:8:25: 8:26
scope 1 {
- debug v => _3; // in scope 1 at $DIR/simplify-arm.rs:11:14: 11:15
+ debug v => ((_0 as Some).0: u8); // in scope 1 at $DIR/simplify-arm.rs:11:14: 11:15
- debug v => _3; // in scope 1 at $DIR/simplify-arm.rs:8:14: 8:15
+ debug v => ((_0 as Some).0: u8); // in scope 1 at $DIR/simplify-arm.rs:8:14: 8:15
}

bb0: {
_2 = discriminant(_1); // scope 0 at $DIR/simplify-arm.rs:11:9: 11:16
switchInt(move _2) -> [0_isize: bb1, 1_isize: bb3, otherwise: bb2]; // scope 0 at $DIR/simplify-arm.rs:11:9: 11:16
_2 = discriminant(_1); // scope 0 at $DIR/simplify-arm.rs:8:9: 8:16
switchInt(move _2) -> [0_isize: bb1, 1_isize: bb3, otherwise: bb2]; // scope 0 at $DIR/simplify-arm.rs:8:9: 8:16
}

bb1: {
discriminant(_0) = 0; // scope 0 at $DIR/simplify-arm.rs:12:17: 12:21
goto -> bb4; // scope 0 at $DIR/simplify-arm.rs:10:5: 13:6
discriminant(_0) = 0; // scope 0 at $DIR/simplify-arm.rs:9:17: 9:21
goto -> bb4; // scope 0 at $DIR/simplify-arm.rs:7:5: 10:6
}

bb2: {
unreachable; // scope 0 at $DIR/simplify-arm.rs:10:11: 10:12
unreachable; // scope 0 at $DIR/simplify-arm.rs:7:11: 7:12
}

bb3: {
- StorageLive(_3); // scope 0 at $DIR/simplify-arm.rs:11:14: 11:15
- _3 = ((_1 as Some).0: u8); // scope 0 at $DIR/simplify-arm.rs:11:14: 11:15
- StorageLive(_4); // scope 1 at $DIR/simplify-arm.rs:11:25: 11:26
- _4 = _3; // scope 1 at $DIR/simplify-arm.rs:11:25: 11:26
- ((_0 as Some).0: u8) = move _4; // scope 1 at $DIR/simplify-arm.rs:11:20: 11:27
- discriminant(_0) = 1; // scope 1 at $DIR/simplify-arm.rs:11:20: 11:27
- StorageDead(_4); // scope 1 at $DIR/simplify-arm.rs:11:26: 11:27
- StorageDead(_3); // scope 0 at $DIR/simplify-arm.rs:11:26: 11:27
+ _0 = move _1; // scope 1 at $DIR/simplify-arm.rs:11:20: 11:27
goto -> bb4; // scope 0 at $DIR/simplify-arm.rs:10:5: 13:6
- StorageLive(_3); // scope 0 at $DIR/simplify-arm.rs:8:14: 8:15
- _3 = ((_1 as Some).0: u8); // scope 0 at $DIR/simplify-arm.rs:8:14: 8:15
- StorageLive(_4); // scope 1 at $DIR/simplify-arm.rs:8:25: 8:26
- _4 = _3; // scope 1 at $DIR/simplify-arm.rs:8:25: 8:26
- ((_0 as Some).0: u8) = move _4; // scope 1 at $DIR/simplify-arm.rs:8:20: 8:27
- discriminant(_0) = 1; // scope 1 at $DIR/simplify-arm.rs:8:20: 8:27
- StorageDead(_4); // scope 1 at $DIR/simplify-arm.rs:8:26: 8:27
- StorageDead(_3); // scope 0 at $DIR/simplify-arm.rs:8:26: 8:27
+ _0 = move _1; // scope 1 at $DIR/simplify-arm.rs:8:20: 8:27
goto -> bb4; // scope 0 at $DIR/simplify-arm.rs:7:5: 10:6
}

bb4: {
return; // scope 0 at $DIR/simplify-arm.rs:14:2: 14:2
return; // scope 0 at $DIR/simplify-arm.rs:11:2: 11:2
}
}

40 changes: 0 additions & 40 deletions src/test/mir-opt/simplify_arm.id.SimplifyBranchSame.diff
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This file was deleted.

70 changes: 35 additions & 35 deletions src/test/mir-opt/simplify_arm.id_result.SimplifyArmIdentity.diff
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Original file line number Diff line number Diff line change
@@ -2,59 +2,59 @@
+ // MIR for `id_result` after SimplifyArmIdentity

fn id_result(_1: std::result::Result<u8, i32>) -> std::result::Result<u8, i32> {
debug r => _1; // in scope 0 at $DIR/simplify-arm.rs:16:14: 16:15
let mut _0: std::result::Result<u8, i32>; // return place in scope 0 at $DIR/simplify-arm.rs:16:37: 16:52
let mut _2: isize; // in scope 0 at $DIR/simplify-arm.rs:18:9: 18:14
let _3: u8; // in scope 0 at $DIR/simplify-arm.rs:18:12: 18:13
let mut _4: u8; // in scope 0 at $DIR/simplify-arm.rs:18:21: 18:22
let _5: i32; // in scope 0 at $DIR/simplify-arm.rs:19:13: 19:14
let mut _6: i32; // in scope 0 at $DIR/simplify-arm.rs:19:23: 19:24
debug r => _1; // in scope 0 at $DIR/simplify-arm.rs:13:14: 13:15
let mut _0: std::result::Result<u8, i32>; // return place in scope 0 at $DIR/simplify-arm.rs:13:37: 13:52
let mut _2: isize; // in scope 0 at $DIR/simplify-arm.rs:15:9: 15:14
let _3: u8; // in scope 0 at $DIR/simplify-arm.rs:15:12: 15:13
let mut _4: u8; // in scope 0 at $DIR/simplify-arm.rs:15:21: 15:22
let _5: i32; // in scope 0 at $DIR/simplify-arm.rs:16:13: 16:14
let mut _6: i32; // in scope 0 at $DIR/simplify-arm.rs:16:23: 16:24
scope 1 {
- debug x => _3; // in scope 1 at $DIR/simplify-arm.rs:18:12: 18:13
+ debug x => ((_0 as Ok).0: u8); // in scope 1 at $DIR/simplify-arm.rs:18:12: 18:13
- debug x => _3; // in scope 1 at $DIR/simplify-arm.rs:15:12: 15:13
+ debug x => ((_0 as Ok).0: u8); // in scope 1 at $DIR/simplify-arm.rs:15:12: 15:13
}
scope 2 {
- debug y => _5; // in scope 2 at $DIR/simplify-arm.rs:19:13: 19:14
+ debug y => ((_0 as Err).0: i32); // in scope 2 at $DIR/simplify-arm.rs:19:13: 19:14
- debug y => _5; // in scope 2 at $DIR/simplify-arm.rs:16:13: 16:14
+ debug y => ((_0 as Err).0: i32); // in scope 2 at $DIR/simplify-arm.rs:16:13: 16:14
}

bb0: {
_2 = discriminant(_1); // scope 0 at $DIR/simplify-arm.rs:18:9: 18:14
switchInt(move _2) -> [0_isize: bb3, 1_isize: bb1, otherwise: bb2]; // scope 0 at $DIR/simplify-arm.rs:18:9: 18:14
_2 = discriminant(_1); // scope 0 at $DIR/simplify-arm.rs:15:9: 15:14
switchInt(move _2) -> [0_isize: bb3, 1_isize: bb1, otherwise: bb2]; // scope 0 at $DIR/simplify-arm.rs:15:9: 15:14
}

bb1: {
- StorageLive(_5); // scope 0 at $DIR/simplify-arm.rs:19:13: 19:14
- _5 = ((_1 as Err).0: i32); // scope 0 at $DIR/simplify-arm.rs:19:13: 19:14
- StorageLive(_6); // scope 2 at $DIR/simplify-arm.rs:19:23: 19:24
- _6 = _5; // scope 2 at $DIR/simplify-arm.rs:19:23: 19:24
- ((_0 as Err).0: i32) = move _6; // scope 2 at $DIR/simplify-arm.rs:19:19: 19:25
- discriminant(_0) = 1; // scope 2 at $DIR/simplify-arm.rs:19:19: 19:25
- StorageDead(_6); // scope 2 at $DIR/simplify-arm.rs:19:24: 19:25
- StorageDead(_5); // scope 0 at $DIR/simplify-arm.rs:19:24: 19:25
+ _0 = move _1; // scope 2 at $DIR/simplify-arm.rs:19:19: 19:25
goto -> bb4; // scope 0 at $DIR/simplify-arm.rs:17:5: 20:6
- StorageLive(_5); // scope 0 at $DIR/simplify-arm.rs:16:13: 16:14
- _5 = ((_1 as Err).0: i32); // scope 0 at $DIR/simplify-arm.rs:16:13: 16:14
- StorageLive(_6); // scope 2 at $DIR/simplify-arm.rs:16:23: 16:24
- _6 = _5; // scope 2 at $DIR/simplify-arm.rs:16:23: 16:24
- ((_0 as Err).0: i32) = move _6; // scope 2 at $DIR/simplify-arm.rs:16:19: 16:25
- discriminant(_0) = 1; // scope 2 at $DIR/simplify-arm.rs:16:19: 16:25
- StorageDead(_6); // scope 2 at $DIR/simplify-arm.rs:16:24: 16:25
- StorageDead(_5); // scope 0 at $DIR/simplify-arm.rs:16:24: 16:25
+ _0 = move _1; // scope 2 at $DIR/simplify-arm.rs:16:19: 16:25
goto -> bb4; // scope 0 at $DIR/simplify-arm.rs:14:5: 17:6
}

bb2: {
unreachable; // scope 0 at $DIR/simplify-arm.rs:17:11: 17:12
unreachable; // scope 0 at $DIR/simplify-arm.rs:14:11: 14:12
}

bb3: {
- StorageLive(_3); // scope 0 at $DIR/simplify-arm.rs:18:12: 18:13
- _3 = ((_1 as Ok).0: u8); // scope 0 at $DIR/simplify-arm.rs:18:12: 18:13
- StorageLive(_4); // scope 1 at $DIR/simplify-arm.rs:18:21: 18:22
- _4 = _3; // scope 1 at $DIR/simplify-arm.rs:18:21: 18:22
- ((_0 as Ok).0: u8) = move _4; // scope 1 at $DIR/simplify-arm.rs:18:18: 18:23
- discriminant(_0) = 0; // scope 1 at $DIR/simplify-arm.rs:18:18: 18:23
- StorageDead(_4); // scope 1 at $DIR/simplify-arm.rs:18:22: 18:23
- StorageDead(_3); // scope 0 at $DIR/simplify-arm.rs:18:22: 18:23
+ _0 = move _1; // scope 1 at $DIR/simplify-arm.rs:18:18: 18:23
goto -> bb4; // scope 0 at $DIR/simplify-arm.rs:17:5: 20:6
- StorageLive(_3); // scope 0 at $DIR/simplify-arm.rs:15:12: 15:13
- _3 = ((_1 as Ok).0: u8); // scope 0 at $DIR/simplify-arm.rs:15:12: 15:13
- StorageLive(_4); // scope 1 at $DIR/simplify-arm.rs:15:21: 15:22
- _4 = _3; // scope 1 at $DIR/simplify-arm.rs:15:21: 15:22
- ((_0 as Ok).0: u8) = move _4; // scope 1 at $DIR/simplify-arm.rs:15:18: 15:23
- discriminant(_0) = 0; // scope 1 at $DIR/simplify-arm.rs:15:18: 15:23
- StorageDead(_4); // scope 1 at $DIR/simplify-arm.rs:15:22: 15:23
- StorageDead(_3); // scope 0 at $DIR/simplify-arm.rs:15:22: 15:23
+ _0 = move _1; // scope 1 at $DIR/simplify-arm.rs:15:18: 15:23
goto -> bb4; // scope 0 at $DIR/simplify-arm.rs:14:5: 17:6
}

bb4: {
return; // scope 0 at $DIR/simplify-arm.rs:21:2: 21:2
return; // scope 0 at $DIR/simplify-arm.rs:18:2: 18:2
}
}

45 changes: 0 additions & 45 deletions src/test/mir-opt/simplify_arm.id_result.SimplifyBranchSame.diff
View file

This file was deleted.

104 changes: 52 additions & 52 deletions src/test/mir-opt/simplify_arm.id_try.SimplifyArmIdentity.diff
View file
Original file line number Diff line number Diff line change
@@ -2,25 +2,25 @@
+ // MIR for `id_try` after SimplifyArmIdentity

fn id_try(_1: std::result::Result<u8, i32>) -> std::result::Result<u8, i32> {
debug r => _1; // in scope 0 at $DIR/simplify-arm.rs:23:11: 23:12
let mut _0: std::result::Result<u8, i32>; // return place in scope 0 at $DIR/simplify-arm.rs:23:34: 23:49
let _2: u8; // in scope 0 at $DIR/simplify-arm.rs:24:9: 24:10
let mut _3: std::result::Result<u8, i32>; // in scope 0 at $DIR/simplify-arm.rs:24:13: 24:15
let mut _4: std::result::Result<u8, i32>; // in scope 0 at $DIR/simplify-arm.rs:24:13: 24:14
let mut _5: isize; // in scope 0 at $DIR/simplify-arm.rs:24:14: 24:15
let _6: i32; // in scope 0 at $DIR/simplify-arm.rs:24:14: 24:15
let mut _7: !; // in scope 0 at $DIR/simplify-arm.rs:24:14: 24:15
let mut _8: i32; // in scope 0 at $DIR/simplify-arm.rs:24:14: 24:15
let mut _9: i32; // in scope 0 at $DIR/simplify-arm.rs:24:14: 24:15
let _10: u8; // in scope 0 at $DIR/simplify-arm.rs:24:13: 24:15
let mut _11: u8; // in scope 0 at $DIR/simplify-arm.rs:25:8: 25:9
debug r => _1; // in scope 0 at $DIR/simplify-arm.rs:20:11: 20:12
let mut _0: std::result::Result<u8, i32>; // return place in scope 0 at $DIR/simplify-arm.rs:20:34: 20:49
let _2: u8; // in scope 0 at $DIR/simplify-arm.rs:21:9: 21:10
let mut _3: std::result::Result<u8, i32>; // in scope 0 at $DIR/simplify-arm.rs:21:13: 21:15
let mut _4: std::result::Result<u8, i32>; // in scope 0 at $DIR/simplify-arm.rs:21:13: 21:14
let mut _5: isize; // in scope 0 at $DIR/simplify-arm.rs:21:14: 21:15
let _6: i32; // in scope 0 at $DIR/simplify-arm.rs:21:14: 21:15
let mut _7: !; // in scope 0 at $DIR/simplify-arm.rs:21:14: 21:15
let mut _8: i32; // in scope 0 at $DIR/simplify-arm.rs:21:14: 21:15
let mut _9: i32; // in scope 0 at $DIR/simplify-arm.rs:21:14: 21:15
let _10: u8; // in scope 0 at $DIR/simplify-arm.rs:21:13: 21:15
let mut _11: u8; // in scope 0 at $DIR/simplify-arm.rs:22:8: 22:9
scope 1 {
- debug x => _2; // in scope 1 at $DIR/simplify-arm.rs:24:9: 24:10
+ debug x => ((_0 as Ok).0: u8); // in scope 1 at $DIR/simplify-arm.rs:24:9: 24:10
- debug x => _2; // in scope 1 at $DIR/simplify-arm.rs:21:9: 21:10
+ debug x => ((_0 as Ok).0: u8); // in scope 1 at $DIR/simplify-arm.rs:21:9: 21:10
}
scope 2 {
- debug err => _6; // in scope 2 at $DIR/simplify-arm.rs:24:14: 24:15
+ debug err => ((_0 as Err).0: i32); // in scope 2 at $DIR/simplify-arm.rs:24:14: 24:15
- debug err => _6; // in scope 2 at $DIR/simplify-arm.rs:21:14: 21:15
+ debug err => ((_0 as Err).0: i32); // in scope 2 at $DIR/simplify-arm.rs:21:14: 21:15
scope 3 {
scope 7 {
- debug t => _9; // in scope 7 at $SRC_DIR/core/src/convert/mod.rs:LL:COL
@@ -29,13 +29,13 @@
scope 8 {
- debug v => _8; // in scope 8 at $SRC_DIR/core/src/result.rs:LL:COL
+ debug v => ((_0 as Err).0: i32); // in scope 8 at $SRC_DIR/core/src/result.rs:LL:COL
let mut _12: i32; // in scope 8 at $DIR/simplify-arm.rs:24:13: 24:15
let mut _12: i32; // in scope 8 at $DIR/simplify-arm.rs:21:13: 21:15
}
}
}
scope 4 {
- debug val => _10; // in scope 4 at $DIR/simplify-arm.rs:24:13: 24:15
+ debug val => ((_0 as Ok).0: u8); // in scope 4 at $DIR/simplify-arm.rs:24:13: 24:15
- debug val => _10; // in scope 4 at $DIR/simplify-arm.rs:21:13: 21:15
+ debug val => ((_0 as Ok).0: u8); // in scope 4 at $DIR/simplify-arm.rs:21:13: 21:15
scope 5 {
}
}
@@ -44,59 +44,59 @@
}

bb0: {
StorageLive(_2); // scope 0 at $DIR/simplify-arm.rs:24:9: 24:10
StorageLive(_3); // scope 0 at $DIR/simplify-arm.rs:24:13: 24:15
StorageLive(_4); // scope 0 at $DIR/simplify-arm.rs:24:13: 24:14
_4 = _1; // scope 0 at $DIR/simplify-arm.rs:24:13: 24:14
StorageLive(_2); // scope 0 at $DIR/simplify-arm.rs:21:9: 21:10
StorageLive(_3); // scope 0 at $DIR/simplify-arm.rs:21:13: 21:15
StorageLive(_4); // scope 0 at $DIR/simplify-arm.rs:21:13: 21:14
_4 = _1; // scope 0 at $DIR/simplify-arm.rs:21:13: 21:14
_3 = move _4; // scope 6 at $SRC_DIR/core/src/result.rs:LL:COL
StorageDead(_4); // scope 0 at $DIR/simplify-arm.rs:24:14: 24:15
_5 = discriminant(_3); // scope 0 at $DIR/simplify-arm.rs:24:14: 24:15
switchInt(move _5) -> [0_isize: bb1, 1_isize: bb3, otherwise: bb2]; // scope 0 at $DIR/simplify-arm.rs:24:14: 24:15
StorageDead(_4); // scope 0 at $DIR/simplify-arm.rs:21:14: 21:15
_5 = discriminant(_3); // scope 0 at $DIR/simplify-arm.rs:21:14: 21:15
switchInt(move _5) -> [0_isize: bb1, 1_isize: bb3, otherwise: bb2]; // scope 0 at $DIR/simplify-arm.rs:21:14: 21:15
}

bb1: {
- StorageLive(_10); // scope 0 at $DIR/simplify-arm.rs:24:13: 24:15
- _10 = ((_3 as Ok).0: u8); // scope 0 at $DIR/simplify-arm.rs:24:13: 24:15
- _2 = _10; // scope 5 at $DIR/simplify-arm.rs:24:13: 24:15
- StorageDead(_10); // scope 0 at $DIR/simplify-arm.rs:24:14: 24:15
+ _0 = move _3; // scope 1 at $DIR/simplify-arm.rs:25:5: 25:10
StorageDead(_3); // scope 0 at $DIR/simplify-arm.rs:24:15: 24:16
- StorageLive(_11); // scope 1 at $DIR/simplify-arm.rs:25:8: 25:9
- _11 = _2; // scope 1 at $DIR/simplify-arm.rs:25:8: 25:9
- ((_0 as Ok).0: u8) = move _11; // scope 1 at $DIR/simplify-arm.rs:25:5: 25:10
- discriminant(_0) = 0; // scope 1 at $DIR/simplify-arm.rs:25:5: 25:10
- StorageDead(_11); // scope 1 at $DIR/simplify-arm.rs:25:9: 25:10
StorageDead(_2); // scope 0 at $DIR/simplify-arm.rs:26:1: 26:2
goto -> bb4; // scope 0 at $DIR/simplify-arm.rs:26:2: 26:2
- StorageLive(_10); // scope 0 at $DIR/simplify-arm.rs:21:13: 21:15
- _10 = ((_3 as Ok).0: u8); // scope 0 at $DIR/simplify-arm.rs:21:13: 21:15
- _2 = _10; // scope 5 at $DIR/simplify-arm.rs:21:13: 21:15
- StorageDead(_10); // scope 0 at $DIR/simplify-arm.rs:21:14: 21:15
+ _0 = move _3; // scope 1 at $DIR/simplify-arm.rs:22:5: 22:10
StorageDead(_3); // scope 0 at $DIR/simplify-arm.rs:21:15: 21:16
- StorageLive(_11); // scope 1 at $DIR/simplify-arm.rs:22:8: 22:9
- _11 = _2; // scope 1 at $DIR/simplify-arm.rs:22:8: 22:9
- ((_0 as Ok).0: u8) = move _11; // scope 1 at $DIR/simplify-arm.rs:22:5: 22:10
- discriminant(_0) = 0; // scope 1 at $DIR/simplify-arm.rs:22:5: 22:10
- StorageDead(_11); // scope 1 at $DIR/simplify-arm.rs:22:9: 22:10
StorageDead(_2); // scope 0 at $DIR/simplify-arm.rs:23:1: 23:2
goto -> bb4; // scope 0 at $DIR/simplify-arm.rs:23:2: 23:2
}

bb2: {
unreachable; // scope 0 at $DIR/simplify-arm.rs:24:13: 24:15
unreachable; // scope 0 at $DIR/simplify-arm.rs:21:13: 21:15
}

bb3: {
- StorageLive(_6); // scope 0 at $DIR/simplify-arm.rs:24:14: 24:15
- _6 = ((_3 as Err).0: i32); // scope 0 at $DIR/simplify-arm.rs:24:14: 24:15
- StorageLive(_8); // scope 3 at $DIR/simplify-arm.rs:24:14: 24:15
- StorageLive(_9); // scope 3 at $DIR/simplify-arm.rs:24:14: 24:15
- _9 = _6; // scope 3 at $DIR/simplify-arm.rs:24:14: 24:15
- StorageLive(_6); // scope 0 at $DIR/simplify-arm.rs:21:14: 21:15
- _6 = ((_3 as Err).0: i32); // scope 0 at $DIR/simplify-arm.rs:21:14: 21:15
- StorageLive(_8); // scope 3 at $DIR/simplify-arm.rs:21:14: 21:15
- StorageLive(_9); // scope 3 at $DIR/simplify-arm.rs:21:14: 21:15
- _9 = _6; // scope 3 at $DIR/simplify-arm.rs:21:14: 21:15
- _8 = move _9; // scope 7 at $SRC_DIR/core/src/convert/mod.rs:LL:COL
- StorageDead(_9); // scope 3 at $DIR/simplify-arm.rs:24:14: 24:15
- StorageDead(_9); // scope 3 at $DIR/simplify-arm.rs:21:14: 21:15
- StorageLive(_12); // scope 8 at $SRC_DIR/core/src/result.rs:LL:COL
- _12 = move _8; // scope 8 at $SRC_DIR/core/src/result.rs:LL:COL
- ((_0 as Err).0: i32) = move _12; // scope 8 at $SRC_DIR/core/src/result.rs:LL:COL
- discriminant(_0) = 1; // scope 8 at $SRC_DIR/core/src/result.rs:LL:COL
- StorageDead(_12); // scope 8 at $SRC_DIR/core/src/result.rs:LL:COL
- StorageDead(_8); // scope 3 at $DIR/simplify-arm.rs:24:14: 24:15
- StorageDead(_6); // scope 0 at $DIR/simplify-arm.rs:24:14: 24:15
- StorageDead(_8); // scope 3 at $DIR/simplify-arm.rs:21:14: 21:15
- StorageDead(_6); // scope 0 at $DIR/simplify-arm.rs:21:14: 21:15
+ _0 = move _3; // scope 8 at $SRC_DIR/core/src/result.rs:LL:COL
StorageDead(_3); // scope 0 at $DIR/simplify-arm.rs:24:15: 24:16
StorageDead(_2); // scope 0 at $DIR/simplify-arm.rs:26:1: 26:2
goto -> bb4; // scope 0 at $DIR/simplify-arm.rs:26:2: 26:2
StorageDead(_3); // scope 0 at $DIR/simplify-arm.rs:21:15: 21:16
StorageDead(_2); // scope 0 at $DIR/simplify-arm.rs:23:1: 23:2
goto -> bb4; // scope 0 at $DIR/simplify-arm.rs:23:2: 23:2
}

bb4: {
return; // scope 0 at $DIR/simplify-arm.rs:26:2: 26:2
return; // scope 0 at $DIR/simplify-arm.rs:23:2: 23:2
}
}

76 changes: 0 additions & 76 deletions src/test/mir-opt/simplify_arm.id_try.SimplifyBranchSame.diff
View file

This file was deleted.

17 changes: 15 additions & 2 deletions ...t/mir-opt/simplify_locals_removes_unused_discriminant_reads.map.SimplifyLocals.32bit.diff
View file
Original file line number Diff line number Diff line change
@@ -4,7 +4,7 @@
fn map(_1: Option<Box<()>>) -> Option<Box<()>> {
debug x => _1; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:3:8: 3:9
let mut _0: std::option::Option<std::boxed::Box<()>>; // return place in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:3:31: 3:46
- let mut _2: isize; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:5:9: 5:13
let mut _2: isize; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:5:9: 5:13
- let _3: std::boxed::Box<()>; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:6:14: 6:15
- let mut _4: std::boxed::Box<()>; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:6:25: 6:26
- let mut _5: bool; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:8:1: 8:2
@@ -17,8 +17,21 @@
bb0: {
- _5 = const false; // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:5:9: 5:13
- _5 = const true; // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:5:9: 5:13
- _2 = discriminant(_1); // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:5:9: 5:13
_2 = discriminant(_1); // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:5:9: 5:13
switchInt(move _2) -> [0_isize: bb2, otherwise: bb1]; // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:5:9: 5:13
}

bb1: {
_0 = move _1; // scope 1 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:6:20: 6:27
goto -> bb3; // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:4:5: 7:6
}

bb2: {
discriminant(_0) = 0; // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:5:17: 5:21
goto -> bb3; // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:4:5: 7:6
}

bb3: {
- _6 = discriminant(_1); // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:8:1: 8:2
return; // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:8:2: 8:2
}
17 changes: 15 additions & 2 deletions ...t/mir-opt/simplify_locals_removes_unused_discriminant_reads.map.SimplifyLocals.64bit.diff
View file
Original file line number Diff line number Diff line change
@@ -4,7 +4,7 @@
fn map(_1: Option<Box<()>>) -> Option<Box<()>> {
debug x => _1; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:3:8: 3:9
let mut _0: std::option::Option<std::boxed::Box<()>>; // return place in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:3:31: 3:46
- let mut _2: isize; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:5:9: 5:13
let mut _2: isize; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:5:9: 5:13
- let _3: std::boxed::Box<()>; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:6:14: 6:15
- let mut _4: std::boxed::Box<()>; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:6:25: 6:26
- let mut _5: bool; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:8:1: 8:2
@@ -17,8 +17,21 @@
bb0: {
- _5 = const false; // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:5:9: 5:13
- _5 = const true; // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:5:9: 5:13
- _2 = discriminant(_1); // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:5:9: 5:13
_2 = discriminant(_1); // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:5:9: 5:13
switchInt(move _2) -> [0_isize: bb2, otherwise: bb1]; // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:5:9: 5:13
}

bb1: {
_0 = move _1; // scope 1 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:6:20: 6:27
goto -> bb3; // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:4:5: 7:6
}

bb2: {
discriminant(_0) = 0; // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:5:17: 5:21
goto -> bb3; // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:4:5: 7:6
}

bb3: {
- _6 = discriminant(_1); // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:8:1: 8:2
return; // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:8:2: 8:2
}
1 change: 0 additions & 1 deletion src/test/mir-opt/simplify_try.rs
View file
Original file line number Diff line number Diff line change
@@ -1,6 +1,5 @@
// compile-flags: -Zunsound-mir-opts
// EMIT_MIR simplify_try.try_identity.SimplifyArmIdentity.diff
// EMIT_MIR simplify_try.try_identity.SimplifyBranchSame.after.mir
// EMIT_MIR simplify_try.try_identity.SimplifyLocals.after.mir
// EMIT_MIR simplify_try.try_identity.DestinationPropagation.diff

77 changes: 43 additions & 34 deletions src/test/mir-opt/simplify_try.try_identity.DestinationPropagation.diff
View file
Original file line number Diff line number Diff line change
@@ -2,35 +2,35 @@
+ // MIR for `try_identity` after DestinationPropagation

fn try_identity(_1: std::result::Result<u32, i32>) -> std::result::Result<u32, i32> {
debug x => _1; // in scope 0 at $DIR/simplify_try.rs:7:17: 7:18
let mut _0: std::result::Result<u32, i32>; // return place in scope 0 at $DIR/simplify_try.rs:7:41: 7:57
let _2: u32; // in scope 0 at $DIR/simplify_try.rs:8:9: 8:10
let mut _3: std::result::Result<u32, i32>; // in scope 0 at $DIR/simplify_try.rs:8:13: 8:15
let mut _4: std::result::Result<u32, i32>; // in scope 0 at $DIR/simplify_try.rs:8:13: 8:14
let mut _5: isize; // in scope 0 at $DIR/simplify_try.rs:8:14: 8:15
let _6: i32; // in scope 0 at $DIR/simplify_try.rs:8:14: 8:15
let mut _7: !; // in scope 0 at $DIR/simplify_try.rs:8:14: 8:15
let mut _8: i32; // in scope 0 at $DIR/simplify_try.rs:8:14: 8:15
let mut _9: i32; // in scope 0 at $DIR/simplify_try.rs:8:14: 8:15
let _10: u32; // in scope 0 at $DIR/simplify_try.rs:8:13: 8:15
let mut _11: u32; // in scope 0 at $DIR/simplify_try.rs:9:8: 9:9
debug x => _1; // in scope 0 at $DIR/simplify_try.rs:6:17: 6:18
let mut _0: std::result::Result<u32, i32>; // return place in scope 0 at $DIR/simplify_try.rs:6:41: 6:57
let _2: u32; // in scope 0 at $DIR/simplify_try.rs:7:9: 7:10
let mut _3: std::result::Result<u32, i32>; // in scope 0 at $DIR/simplify_try.rs:7:13: 7:15
let mut _4: std::result::Result<u32, i32>; // in scope 0 at $DIR/simplify_try.rs:7:13: 7:14
let mut _5: isize; // in scope 0 at $DIR/simplify_try.rs:7:14: 7:15
let _6: i32; // in scope 0 at $DIR/simplify_try.rs:7:14: 7:15
let mut _7: !; // in scope 0 at $DIR/simplify_try.rs:7:14: 7:15
let mut _8: i32; // in scope 0 at $DIR/simplify_try.rs:7:14: 7:15
let mut _9: i32; // in scope 0 at $DIR/simplify_try.rs:7:14: 7:15
let _10: u32; // in scope 0 at $DIR/simplify_try.rs:7:13: 7:15
let mut _11: u32; // in scope 0 at $DIR/simplify_try.rs:8:8: 8:9
scope 1 {
debug y => ((_0 as Ok).0: u32); // in scope 1 at $DIR/simplify_try.rs:8:9: 8:10
debug y => ((_0 as Ok).0: u32); // in scope 1 at $DIR/simplify_try.rs:7:9: 7:10
}
scope 2 {
debug err => ((_0 as Err).0: i32); // in scope 2 at $DIR/simplify_try.rs:8:14: 8:15
debug err => ((_0 as Err).0: i32); // in scope 2 at $DIR/simplify_try.rs:7:14: 7:15
scope 3 {
scope 7 {
debug t => ((_0 as Err).0: i32); // in scope 7 at $SRC_DIR/core/src/convert/mod.rs:LL:COL
}
scope 8 {
debug v => ((_0 as Err).0: i32); // in scope 8 at $SRC_DIR/core/src/result.rs:LL:COL
let mut _12: i32; // in scope 8 at $DIR/simplify_try.rs:8:13: 8:15
let mut _12: i32; // in scope 8 at $DIR/simplify_try.rs:7:13: 7:15
}
}
}
scope 4 {
debug val => ((_0 as Ok).0: u32); // in scope 4 at $DIR/simplify_try.rs:8:13: 8:15
debug val => ((_0 as Ok).0: u32); // in scope 4 at $DIR/simplify_try.rs:7:13: 7:15
scope 5 {
}
}
@@ -40,29 +40,38 @@
}

bb0: {
StorageLive(_2); // scope 0 at $DIR/simplify_try.rs:8:9: 8:10
- StorageLive(_3); // scope 0 at $DIR/simplify_try.rs:8:13: 8:15
- StorageLive(_4); // scope 0 at $DIR/simplify_try.rs:8:13: 8:14
- _4 = _1; // scope 0 at $DIR/simplify_try.rs:8:13: 8:14
StorageLive(_2); // scope 0 at $DIR/simplify_try.rs:7:9: 7:10
- StorageLive(_3); // scope 0 at $DIR/simplify_try.rs:7:13: 7:15
- StorageLive(_4); // scope 0 at $DIR/simplify_try.rs:7:13: 7:14
- _4 = _1; // scope 0 at $DIR/simplify_try.rs:7:13: 7:14
- _3 = move _4; // scope 6 at $SRC_DIR/core/src/result.rs:LL:COL
- StorageDead(_4); // scope 0 at $DIR/simplify_try.rs:8:14: 8:15
- _5 = discriminant(_3); // scope 0 at $DIR/simplify_try.rs:8:14: 8:15
+ nop; // scope 0 at $DIR/simplify_try.rs:8:13: 8:15
+ nop; // scope 0 at $DIR/simplify_try.rs:8:13: 8:14
+ _0 = _1; // scope 0 at $DIR/simplify_try.rs:8:13: 8:14
- StorageDead(_4); // scope 0 at $DIR/simplify_try.rs:7:14: 7:15
- _5 = discriminant(_3); // scope 0 at $DIR/simplify_try.rs:7:14: 7:15
+ nop; // scope 0 at $DIR/simplify_try.rs:7:13: 7:15
+ nop; // scope 0 at $DIR/simplify_try.rs:7:13: 7:14
+ _0 = _1; // scope 0 at $DIR/simplify_try.rs:7:13: 7:14
+ nop; // scope 6 at $SRC_DIR/core/src/result.rs:LL:COL
+ nop; // scope 0 at $DIR/simplify_try.rs:8:14: 8:15
+ _5 = discriminant(_0); // scope 0 at $DIR/simplify_try.rs:8:14: 8:15
goto -> bb1; // scope 0 at $DIR/simplify_try.rs:8:14: 8:15
+ nop; // scope 0 at $DIR/simplify_try.rs:7:14: 7:15
+ _5 = discriminant(_0); // scope 0 at $DIR/simplify_try.rs:7:14: 7:15
switchInt(move _5) -> [0_isize: bb1, otherwise: bb2]; // scope 0 at $DIR/simplify_try.rs:7:14: 7:15
}

bb1: {
- _0 = move _3; // scope 1 at $DIR/simplify_try.rs:9:5: 9:10
- StorageDead(_3); // scope 0 at $DIR/simplify_try.rs:8:15: 8:16
+ nop; // scope 1 at $DIR/simplify_try.rs:9:5: 9:10
+ nop; // scope 0 at $DIR/simplify_try.rs:8:15: 8:16
StorageDead(_2); // scope 0 at $DIR/simplify_try.rs:10:1: 10:2
return; // scope 0 at $DIR/simplify_try.rs:10:2: 10:2
- _0 = move _3; // scope 1 at $DIR/simplify_try.rs:8:5: 8:10
- StorageDead(_3); // scope 0 at $DIR/simplify_try.rs:7:15: 7:16
+ nop; // scope 1 at $DIR/simplify_try.rs:8:5: 8:10
+ nop; // scope 0 at $DIR/simplify_try.rs:7:15: 7:16
StorageDead(_2); // scope 0 at $DIR/simplify_try.rs:9:1: 9:2
return; // scope 0 at $DIR/simplify_try.rs:9:2: 9:2
}

bb2: {
- _0 = move _3; // scope 8 at $SRC_DIR/core/src/result.rs:LL:COL
- StorageDead(_3); // scope 0 at $DIR/simplify_try.rs:7:15: 7:16
+ nop; // scope 8 at $SRC_DIR/core/src/result.rs:LL:COL
+ nop; // scope 0 at $DIR/simplify_try.rs:7:15: 7:16
StorageDead(_2); // scope 0 at $DIR/simplify_try.rs:9:1: 9:2
return; // scope 0 at $DIR/simplify_try.rs:9:2: 9:2
}
}

100 changes: 50 additions & 50 deletions src/test/mir-opt/simplify_try.try_identity.SimplifyArmIdentity.diff
View file
Original file line number Diff line number Diff line change
@@ -2,25 +2,25 @@
+ // MIR for `try_identity` after SimplifyArmIdentity

fn try_identity(_1: std::result::Result<u32, i32>) -> std::result::Result<u32, i32> {
debug x => _1; // in scope 0 at $DIR/simplify_try.rs:7:17: 7:18
let mut _0: std::result::Result<u32, i32>; // return place in scope 0 at $DIR/simplify_try.rs:7:41: 7:57
let _2: u32; // in scope 0 at $DIR/simplify_try.rs:8:9: 8:10
let mut _3: std::result::Result<u32, i32>; // in scope 0 at $DIR/simplify_try.rs:8:13: 8:15
let mut _4: std::result::Result<u32, i32>; // in scope 0 at $DIR/simplify_try.rs:8:13: 8:14
let mut _5: isize; // in scope 0 at $DIR/simplify_try.rs:8:14: 8:15
let _6: i32; // in scope 0 at $DIR/simplify_try.rs:8:14: 8:15
let mut _7: !; // in scope 0 at $DIR/simplify_try.rs:8:14: 8:15
let mut _8: i32; // in scope 0 at $DIR/simplify_try.rs:8:14: 8:15
let mut _9: i32; // in scope 0 at $DIR/simplify_try.rs:8:14: 8:15
let _10: u32; // in scope 0 at $DIR/simplify_try.rs:8:13: 8:15
let mut _11: u32; // in scope 0 at $DIR/simplify_try.rs:9:8: 9:9
debug x => _1; // in scope 0 at $DIR/simplify_try.rs:6:17: 6:18
let mut _0: std::result::Result<u32, i32>; // return place in scope 0 at $DIR/simplify_try.rs:6:41: 6:57
let _2: u32; // in scope 0 at $DIR/simplify_try.rs:7:9: 7:10
let mut _3: std::result::Result<u32, i32>; // in scope 0 at $DIR/simplify_try.rs:7:13: 7:15
let mut _4: std::result::Result<u32, i32>; // in scope 0 at $DIR/simplify_try.rs:7:13: 7:14
let mut _5: isize; // in scope 0 at $DIR/simplify_try.rs:7:14: 7:15
let _6: i32; // in scope 0 at $DIR/simplify_try.rs:7:14: 7:15
let mut _7: !; // in scope 0 at $DIR/simplify_try.rs:7:14: 7:15
let mut _8: i32; // in scope 0 at $DIR/simplify_try.rs:7:14: 7:15
let mut _9: i32; // in scope 0 at $DIR/simplify_try.rs:7:14: 7:15
let _10: u32; // in scope 0 at $DIR/simplify_try.rs:7:13: 7:15
let mut _11: u32; // in scope 0 at $DIR/simplify_try.rs:8:8: 8:9
scope 1 {
- debug y => _2; // in scope 1 at $DIR/simplify_try.rs:8:9: 8:10
+ debug y => ((_0 as Ok).0: u32); // in scope 1 at $DIR/simplify_try.rs:8:9: 8:10
- debug y => _2; // in scope 1 at $DIR/simplify_try.rs:7:9: 7:10
+ debug y => ((_0 as Ok).0: u32); // in scope 1 at $DIR/simplify_try.rs:7:9: 7:10
}
scope 2 {
- debug err => _6; // in scope 2 at $DIR/simplify_try.rs:8:14: 8:15
+ debug err => ((_0 as Err).0: i32); // in scope 2 at $DIR/simplify_try.rs:8:14: 8:15
- debug err => _6; // in scope 2 at $DIR/simplify_try.rs:7:14: 7:15
+ debug err => ((_0 as Err).0: i32); // in scope 2 at $DIR/simplify_try.rs:7:14: 7:15
scope 3 {
scope 7 {
- debug t => _9; // in scope 7 at $SRC_DIR/core/src/convert/mod.rs:LL:COL
@@ -29,13 +29,13 @@
scope 8 {
- debug v => _8; // in scope 8 at $SRC_DIR/core/src/result.rs:LL:COL
+ debug v => ((_0 as Err).0: i32); // in scope 8 at $SRC_DIR/core/src/result.rs:LL:COL
let mut _12: i32; // in scope 8 at $DIR/simplify_try.rs:8:13: 8:15
let mut _12: i32; // in scope 8 at $DIR/simplify_try.rs:7:13: 7:15
}
}
}
scope 4 {
- debug val => _10; // in scope 4 at $DIR/simplify_try.rs:8:13: 8:15
+ debug val => ((_0 as Ok).0: u32); // in scope 4 at $DIR/simplify_try.rs:8:13: 8:15
- debug val => _10; // in scope 4 at $DIR/simplify_try.rs:7:13: 7:15
+ debug val => ((_0 as Ok).0: u32); // in scope 4 at $DIR/simplify_try.rs:7:13: 7:15
scope 5 {
}
}
@@ -44,51 +44,51 @@
}

bb0: {
StorageLive(_2); // scope 0 at $DIR/simplify_try.rs:8:9: 8:10
StorageLive(_3); // scope 0 at $DIR/simplify_try.rs:8:13: 8:15
StorageLive(_4); // scope 0 at $DIR/simplify_try.rs:8:13: 8:14
_4 = _1; // scope 0 at $DIR/simplify_try.rs:8:13: 8:14
StorageLive(_2); // scope 0 at $DIR/simplify_try.rs:7:9: 7:10
StorageLive(_3); // scope 0 at $DIR/simplify_try.rs:7:13: 7:15
StorageLive(_4); // scope 0 at $DIR/simplify_try.rs:7:13: 7:14
_4 = _1; // scope 0 at $DIR/simplify_try.rs:7:13: 7:14
_3 = move _4; // scope 6 at $SRC_DIR/core/src/result.rs:LL:COL
StorageDead(_4); // scope 0 at $DIR/simplify_try.rs:8:14: 8:15
_5 = discriminant(_3); // scope 0 at $DIR/simplify_try.rs:8:14: 8:15
switchInt(move _5) -> [0_isize: bb1, otherwise: bb2]; // scope 0 at $DIR/simplify_try.rs:8:14: 8:15
StorageDead(_4); // scope 0 at $DIR/simplify_try.rs:7:14: 7:15
_5 = discriminant(_3); // scope 0 at $DIR/simplify_try.rs:7:14: 7:15
switchInt(move _5) -> [0_isize: bb1, otherwise: bb2]; // scope 0 at $DIR/simplify_try.rs:7:14: 7:15
}

bb1: {
- StorageLive(_10); // scope 0 at $DIR/simplify_try.rs:8:13: 8:15
- _10 = ((_3 as Ok).0: u32); // scope 0 at $DIR/simplify_try.rs:8:13: 8:15
- _2 = _10; // scope 5 at $DIR/simplify_try.rs:8:13: 8:15
- StorageDead(_10); // scope 0 at $DIR/simplify_try.rs:8:14: 8:15
+ _0 = move _3; // scope 1 at $DIR/simplify_try.rs:9:5: 9:10
StorageDead(_3); // scope 0 at $DIR/simplify_try.rs:8:15: 8:16
- StorageLive(_11); // scope 1 at $DIR/simplify_try.rs:9:8: 9:9
- _11 = _2; // scope 1 at $DIR/simplify_try.rs:9:8: 9:9
- ((_0 as Ok).0: u32) = move _11; // scope 1 at $DIR/simplify_try.rs:9:5: 9:10
- discriminant(_0) = 0; // scope 1 at $DIR/simplify_try.rs:9:5: 9:10
- StorageDead(_11); // scope 1 at $DIR/simplify_try.rs:9:9: 9:10
StorageDead(_2); // scope 0 at $DIR/simplify_try.rs:10:1: 10:2
return; // scope 0 at $DIR/simplify_try.rs:10:2: 10:2
- StorageLive(_10); // scope 0 at $DIR/simplify_try.rs:7:13: 7:15
- _10 = ((_3 as Ok).0: u32); // scope 0 at $DIR/simplify_try.rs:7:13: 7:15
- _2 = _10; // scope 5 at $DIR/simplify_try.rs:7:13: 7:15
- StorageDead(_10); // scope 0 at $DIR/simplify_try.rs:7:14: 7:15
+ _0 = move _3; // scope 1 at $DIR/simplify_try.rs:8:5: 8:10
StorageDead(_3); // scope 0 at $DIR/simplify_try.rs:7:15: 7:16
- StorageLive(_11); // scope 1 at $DIR/simplify_try.rs:8:8: 8:9
- _11 = _2; // scope 1 at $DIR/simplify_try.rs:8:8: 8:9
- ((_0 as Ok).0: u32) = move _11; // scope 1 at $DIR/simplify_try.rs:8:5: 8:10
- discriminant(_0) = 0; // scope 1 at $DIR/simplify_try.rs:8:5: 8:10
- StorageDead(_11); // scope 1 at $DIR/simplify_try.rs:8:9: 8:10
StorageDead(_2); // scope 0 at $DIR/simplify_try.rs:9:1: 9:2
return; // scope 0 at $DIR/simplify_try.rs:9:2: 9:2
}

bb2: {
- StorageLive(_6); // scope 0 at $DIR/simplify_try.rs:8:14: 8:15
- _6 = ((_3 as Err).0: i32); // scope 0 at $DIR/simplify_try.rs:8:14: 8:15
- StorageLive(_8); // scope 3 at $DIR/simplify_try.rs:8:14: 8:15
- StorageLive(_9); // scope 3 at $DIR/simplify_try.rs:8:14: 8:15
- _9 = _6; // scope 3 at $DIR/simplify_try.rs:8:14: 8:15
- StorageLive(_6); // scope 0 at $DIR/simplify_try.rs:7:14: 7:15
- _6 = ((_3 as Err).0: i32); // scope 0 at $DIR/simplify_try.rs:7:14: 7:15
- StorageLive(_8); // scope 3 at $DIR/simplify_try.rs:7:14: 7:15
- StorageLive(_9); // scope 3 at $DIR/simplify_try.rs:7:14: 7:15
- _9 = _6; // scope 3 at $DIR/simplify_try.rs:7:14: 7:15
- _8 = move _9; // scope 7 at $SRC_DIR/core/src/convert/mod.rs:LL:COL
- StorageDead(_9); // scope 3 at $DIR/simplify_try.rs:8:14: 8:15
- StorageDead(_9); // scope 3 at $DIR/simplify_try.rs:7:14: 7:15
- StorageLive(_12); // scope 8 at $SRC_DIR/core/src/result.rs:LL:COL
- _12 = move _8; // scope 8 at $SRC_DIR/core/src/result.rs:LL:COL
- ((_0 as Err).0: i32) = move _12; // scope 8 at $SRC_DIR/core/src/result.rs:LL:COL
- discriminant(_0) = 1; // scope 8 at $SRC_DIR/core/src/result.rs:LL:COL
- StorageDead(_12); // scope 8 at $SRC_DIR/core/src/result.rs:LL:COL
- StorageDead(_8); // scope 3 at $DIR/simplify_try.rs:8:14: 8:15
- StorageDead(_6); // scope 0 at $DIR/simplify_try.rs:8:14: 8:15
- StorageDead(_8); // scope 3 at $DIR/simplify_try.rs:7:14: 7:15
- StorageDead(_6); // scope 0 at $DIR/simplify_try.rs:7:14: 7:15
+ _0 = move _3; // scope 8 at $SRC_DIR/core/src/result.rs:LL:COL
StorageDead(_3); // scope 0 at $DIR/simplify_try.rs:8:15: 8:16
StorageDead(_2); // scope 0 at $DIR/simplify_try.rs:10:1: 10:2
return; // scope 0 at $DIR/simplify_try.rs:10:2: 10:2
StorageDead(_3); // scope 0 at $DIR/simplify_try.rs:7:15: 7:16
StorageDead(_2); // scope 0 at $DIR/simplify_try.rs:9:1: 9:2
return; // scope 0 at $DIR/simplify_try.rs:9:2: 9:2
}
}

57 changes: 0 additions & 57 deletions src/test/mir-opt/simplify_try.try_identity.SimplifyBranchSame.after.mir
View file

This file was deleted.

24 changes: 17 additions & 7 deletions src/test/mir-opt/simplify_try.try_identity.SimplifyLocals.after.mir
View file
Original file line number Diff line number Diff line change
@@ -1,13 +1,14 @@
// MIR for `try_identity` after SimplifyLocals

fn try_identity(_1: std::result::Result<u32, i32>) -> std::result::Result<u32, i32> {
debug x => _1; // in scope 0 at $DIR/simplify_try.rs:7:17: 7:18
let mut _0: std::result::Result<u32, i32>; // return place in scope 0 at $DIR/simplify_try.rs:7:41: 7:57
debug x => _1; // in scope 0 at $DIR/simplify_try.rs:6:17: 6:18
let mut _0: std::result::Result<u32, i32>; // return place in scope 0 at $DIR/simplify_try.rs:6:41: 6:57
let mut _2: isize; // in scope 0 at $DIR/simplify_try.rs:7:14: 7:15
scope 1 {
debug y => ((_0 as Ok).0: u32); // in scope 1 at $DIR/simplify_try.rs:8:9: 8:10
debug y => ((_0 as Ok).0: u32); // in scope 1 at $DIR/simplify_try.rs:7:9: 7:10
}
scope 2 {
debug err => ((_0 as Err).0: i32); // in scope 2 at $DIR/simplify_try.rs:8:14: 8:15
debug err => ((_0 as Err).0: i32); // in scope 2 at $DIR/simplify_try.rs:7:14: 7:15
scope 3 {
scope 7 {
debug t => ((_0 as Err).0: i32); // in scope 7 at $SRC_DIR/core/src/convert/mod.rs:LL:COL
@@ -18,7 +19,7 @@ fn try_identity(_1: std::result::Result<u32, i32>) -> std::result::Result<u32, i
}
}
scope 4 {
debug val => ((_0 as Ok).0: u32); // in scope 4 at $DIR/simplify_try.rs:8:13: 8:15
debug val => ((_0 as Ok).0: u32); // in scope 4 at $DIR/simplify_try.rs:7:13: 7:15
scope 5 {
}
}
@@ -27,7 +28,16 @@ fn try_identity(_1: std::result::Result<u32, i32>) -> std::result::Result<u32, i
}

bb0: {
_0 = _1; // scope 0 at $DIR/simplify_try.rs:8:13: 8:14
return; // scope 0 at $DIR/simplify_try.rs:10:2: 10:2
_0 = _1; // scope 0 at $DIR/simplify_try.rs:7:13: 7:14
_2 = discriminant(_0); // scope 0 at $DIR/simplify_try.rs:7:14: 7:15
switchInt(move _2) -> [0_isize: bb1, otherwise: bb2]; // scope 0 at $DIR/simplify_try.rs:7:14: 7:15
}

bb1: {
return; // scope 0 at $DIR/simplify_try.rs:9:2: 9:2
}

bb2: {
return; // scope 0 at $DIR/simplify_try.rs:9:2: 9:2
}
}