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Auto merge of rust-lang#123256 - saethlin:instsimplify-earlier, r=<try>
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Run InstSimplify before UnreachablePropagation

This is the pass ordering change I was musing about: rust-lang#122975 (comment)

r? `@ghost`
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@bors
bors committed Mar 31, 2024
2 parents 5baf1e1 + 0b77e30 commit 49d1f0a
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Showing 32 changed files with 181 additions and 198 deletions.
2 changes: 1 addition & 1 deletion compiler/rustc_mir_transform/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -581,6 +581,7 @@ fn run_optimization_passes<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
&remove_unneeded_drops::RemoveUnneededDrops,
// Type instantiation may create uninhabited enums.
&uninhabited_enum_branching::UninhabitedEnumBranching,
&instsimplify::InstSimplify,
&unreachable_prop::UnreachablePropagation,
&o1(simplify::SimplifyCfg::AfterUninhabitedEnumBranching),
// Inlining may have introduced a lot of redundant code and a large move pattern.
Expand All @@ -593,7 +594,6 @@ fn run_optimization_passes<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
&match_branches::MatchBranchSimplification,
// inst combine is after MatchBranchSimplification to clean up Ne(_1, false)
&multiple_return_terminators::MultipleReturnTerminators,
&instsimplify::InstSimplify,
&simplify::SimplifyLocals::BeforeConstProp,
&dead_store_elimination::DeadStoreElimination::Initial,
&gvn::GVN,
Expand Down
30 changes: 15 additions & 15 deletions ...opt/dataflow-const-prop/default_boxed_slice.main.DataflowConstProp.32bit.panic-abort.diff
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Original file line number Diff line number Diff line change
Expand Up @@ -23,12 +23,12 @@
debug ptr => _6;
scope 12 (inlined NonNull::<[bool; 0]>::new_unchecked) {
debug ptr => _6;
let mut _8: bool;
let _9: ();
let mut _10: *mut ();
let mut _11: *const [bool; 0];
let _8: ();
let mut _9: *mut ();
let mut _10: *const [bool; 0];
scope 13 {
scope 14 (inlined core::ub_checks::check_language_ub) {
let mut _11: bool;
scope 15 (inlined core::ub_checks::check_language_ub::runtime) {
}
}
Expand All @@ -54,18 +54,18 @@
StorageLive(_1);
StorageLive(_2);
StorageLive(_3);
StorageLive(_9);
StorageLive(_8);
StorageLive(_4);
StorageLive(_5);
StorageLive(_6);
StorageLive(_7);
_7 = const 1_usize;
_6 = const {0x1 as *mut [bool; 0]};
StorageDead(_7);
StorageLive(_10);
StorageLive(_11);
StorageLive(_8);
_8 = UbChecks();
switchInt(move _8) -> [0: bb4, otherwise: bb2];
_11 = UbChecks();
switchInt(_11) -> [0: bb4, otherwise: bb2];
}

bb1: {
Expand All @@ -74,28 +74,28 @@
}

bb2: {
StorageLive(_10);
_10 = const {0x1 as *mut ()};
_9 = NonNull::<T>::new_unchecked::precondition_check(const {0x1 as *mut ()}) -> [return: bb3, unwind unreachable];
StorageLive(_9);
_9 = const {0x1 as *mut ()};
_8 = NonNull::<T>::new_unchecked::precondition_check(const {0x1 as *mut ()}) -> [return: bb3, unwind unreachable];
}

bb3: {
StorageDead(_10);
StorageDead(_9);
goto -> bb4;
}

bb4: {
StorageDead(_8);
_11 = const {0x1 as *const [bool; 0]};
_10 = const {0x1 as *const [bool; 0]};
_5 = const NonNull::<[bool; 0]> {{ pointer: {0x1 as *const [bool; 0]} }};
StorageDead(_11);
StorageDead(_10);
StorageDead(_6);
_4 = const Unique::<[bool; 0]> {{ pointer: NonNull::<[bool; 0]> {{ pointer: {0x1 as *const [bool; 0]} }}, _marker: PhantomData::<[bool; 0]> }};
StorageDead(_5);
_3 = const Unique::<[bool]> {{ pointer: NonNull::<[bool]> {{ pointer: Indirect { alloc_id: ALLOC0, offset: Size(0 bytes) }: *const [bool] }}, _marker: PhantomData::<[bool]> }};
StorageDead(_4);
_2 = const Box::<[bool]>(Unique::<[bool]> {{ pointer: NonNull::<[bool]> {{ pointer: Indirect { alloc_id: ALLOC1, offset: Size(0 bytes) }: *const [bool] }}, _marker: PhantomData::<[bool]> }}, std::alloc::Global);
StorageDead(_9);
StorageDead(_8);
StorageDead(_3);
_1 = const A {{ foo: Box::<[bool]>(Unique::<[bool]> {{ pointer: NonNull::<[bool]> {{ pointer: Indirect { alloc_id: ALLOC2, offset: Size(0 bytes) }: *const [bool] }}, _marker: PhantomData::<[bool]> }}, std::alloc::Global) }};
StorageDead(_2);
Expand Down
30 changes: 15 additions & 15 deletions ...pt/dataflow-const-prop/default_boxed_slice.main.DataflowConstProp.32bit.panic-unwind.diff
View file
Original file line number Diff line number Diff line change
Expand Up @@ -23,12 +23,12 @@
debug ptr => _6;
scope 12 (inlined NonNull::<[bool; 0]>::new_unchecked) {
debug ptr => _6;
let mut _8: bool;
let _9: ();
let mut _10: *mut ();
let mut _11: *const [bool; 0];
let _8: ();
let mut _9: *mut ();
let mut _10: *const [bool; 0];
scope 13 {
scope 14 (inlined core::ub_checks::check_language_ub) {
let mut _11: bool;
scope 15 (inlined core::ub_checks::check_language_ub::runtime) {
}
}
Expand All @@ -54,18 +54,18 @@
StorageLive(_1);
StorageLive(_2);
StorageLive(_3);
StorageLive(_9);
StorageLive(_8);
StorageLive(_4);
StorageLive(_5);
StorageLive(_6);
StorageLive(_7);
_7 = const 1_usize;
_6 = const {0x1 as *mut [bool; 0]};
StorageDead(_7);
StorageLive(_10);
StorageLive(_11);
StorageLive(_8);
_8 = UbChecks();
switchInt(move _8) -> [0: bb5, otherwise: bb3];
_11 = UbChecks();
switchInt(_11) -> [0: bb5, otherwise: bb3];
}

bb1: {
Expand All @@ -78,28 +78,28 @@
}

bb3: {
StorageLive(_10);
_10 = const {0x1 as *mut ()};
_9 = NonNull::<T>::new_unchecked::precondition_check(const {0x1 as *mut ()}) -> [return: bb4, unwind unreachable];
StorageLive(_9);
_9 = const {0x1 as *mut ()};
_8 = NonNull::<T>::new_unchecked::precondition_check(const {0x1 as *mut ()}) -> [return: bb4, unwind unreachable];
}

bb4: {
StorageDead(_10);
StorageDead(_9);
goto -> bb5;
}

bb5: {
StorageDead(_8);
_11 = const {0x1 as *const [bool; 0]};
_10 = const {0x1 as *const [bool; 0]};
_5 = const NonNull::<[bool; 0]> {{ pointer: {0x1 as *const [bool; 0]} }};
StorageDead(_11);
StorageDead(_10);
StorageDead(_6);
_4 = const Unique::<[bool; 0]> {{ pointer: NonNull::<[bool; 0]> {{ pointer: {0x1 as *const [bool; 0]} }}, _marker: PhantomData::<[bool; 0]> }};
StorageDead(_5);
_3 = const Unique::<[bool]> {{ pointer: NonNull::<[bool]> {{ pointer: Indirect { alloc_id: ALLOC0, offset: Size(0 bytes) }: *const [bool] }}, _marker: PhantomData::<[bool]> }};
StorageDead(_4);
_2 = const Box::<[bool]>(Unique::<[bool]> {{ pointer: NonNull::<[bool]> {{ pointer: Indirect { alloc_id: ALLOC1, offset: Size(0 bytes) }: *const [bool] }}, _marker: PhantomData::<[bool]> }}, std::alloc::Global);
StorageDead(_9);
StorageDead(_8);
StorageDead(_3);
_1 = const A {{ foo: Box::<[bool]>(Unique::<[bool]> {{ pointer: NonNull::<[bool]> {{ pointer: Indirect { alloc_id: ALLOC2, offset: Size(0 bytes) }: *const [bool] }}, _marker: PhantomData::<[bool]> }}, std::alloc::Global) }};
StorageDead(_2);
Expand Down
30 changes: 15 additions & 15 deletions ...opt/dataflow-const-prop/default_boxed_slice.main.DataflowConstProp.64bit.panic-abort.diff
View file
Original file line number Diff line number Diff line change
Expand Up @@ -23,12 +23,12 @@
debug ptr => _6;
scope 12 (inlined NonNull::<[bool; 0]>::new_unchecked) {
debug ptr => _6;
let mut _8: bool;
let _9: ();
let mut _10: *mut ();
let mut _11: *const [bool; 0];
let _8: ();
let mut _9: *mut ();
let mut _10: *const [bool; 0];
scope 13 {
scope 14 (inlined core::ub_checks::check_language_ub) {
let mut _11: bool;
scope 15 (inlined core::ub_checks::check_language_ub::runtime) {
}
}
Expand All @@ -54,18 +54,18 @@
StorageLive(_1);
StorageLive(_2);
StorageLive(_3);
StorageLive(_9);
StorageLive(_8);
StorageLive(_4);
StorageLive(_5);
StorageLive(_6);
StorageLive(_7);
_7 = const 1_usize;
_6 = const {0x1 as *mut [bool; 0]};
StorageDead(_7);
StorageLive(_10);
StorageLive(_11);
StorageLive(_8);
_8 = UbChecks();
switchInt(move _8) -> [0: bb4, otherwise: bb2];
_11 = UbChecks();
switchInt(_11) -> [0: bb4, otherwise: bb2];
}

bb1: {
Expand All @@ -74,28 +74,28 @@
}

bb2: {
StorageLive(_10);
_10 = const {0x1 as *mut ()};
_9 = NonNull::<T>::new_unchecked::precondition_check(const {0x1 as *mut ()}) -> [return: bb3, unwind unreachable];
StorageLive(_9);
_9 = const {0x1 as *mut ()};
_8 = NonNull::<T>::new_unchecked::precondition_check(const {0x1 as *mut ()}) -> [return: bb3, unwind unreachable];
}

bb3: {
StorageDead(_10);
StorageDead(_9);
goto -> bb4;
}

bb4: {
StorageDead(_8);
_11 = const {0x1 as *const [bool; 0]};
_10 = const {0x1 as *const [bool; 0]};
_5 = const NonNull::<[bool; 0]> {{ pointer: {0x1 as *const [bool; 0]} }};
StorageDead(_11);
StorageDead(_10);
StorageDead(_6);
_4 = const Unique::<[bool; 0]> {{ pointer: NonNull::<[bool; 0]> {{ pointer: {0x1 as *const [bool; 0]} }}, _marker: PhantomData::<[bool; 0]> }};
StorageDead(_5);
_3 = const Unique::<[bool]> {{ pointer: NonNull::<[bool]> {{ pointer: Indirect { alloc_id: ALLOC0, offset: Size(0 bytes) }: *const [bool] }}, _marker: PhantomData::<[bool]> }};
StorageDead(_4);
_2 = const Box::<[bool]>(Unique::<[bool]> {{ pointer: NonNull::<[bool]> {{ pointer: Indirect { alloc_id: ALLOC1, offset: Size(0 bytes) }: *const [bool] }}, _marker: PhantomData::<[bool]> }}, std::alloc::Global);
StorageDead(_9);
StorageDead(_8);
StorageDead(_3);
_1 = const A {{ foo: Box::<[bool]>(Unique::<[bool]> {{ pointer: NonNull::<[bool]> {{ pointer: Indirect { alloc_id: ALLOC2, offset: Size(0 bytes) }: *const [bool] }}, _marker: PhantomData::<[bool]> }}, std::alloc::Global) }};
StorageDead(_2);
Expand Down
30 changes: 15 additions & 15 deletions ...pt/dataflow-const-prop/default_boxed_slice.main.DataflowConstProp.64bit.panic-unwind.diff
View file
Original file line number Diff line number Diff line change
Expand Up @@ -23,12 +23,12 @@
debug ptr => _6;
scope 12 (inlined NonNull::<[bool; 0]>::new_unchecked) {
debug ptr => _6;
let mut _8: bool;
let _9: ();
let mut _10: *mut ();
let mut _11: *const [bool; 0];
let _8: ();
let mut _9: *mut ();
let mut _10: *const [bool; 0];
scope 13 {
scope 14 (inlined core::ub_checks::check_language_ub) {
let mut _11: bool;
scope 15 (inlined core::ub_checks::check_language_ub::runtime) {
}
}
Expand All @@ -54,18 +54,18 @@
StorageLive(_1);
StorageLive(_2);
StorageLive(_3);
StorageLive(_9);
StorageLive(_8);
StorageLive(_4);
StorageLive(_5);
StorageLive(_6);
StorageLive(_7);
_7 = const 1_usize;
_6 = const {0x1 as *mut [bool; 0]};
StorageDead(_7);
StorageLive(_10);
StorageLive(_11);
StorageLive(_8);
_8 = UbChecks();
switchInt(move _8) -> [0: bb5, otherwise: bb3];
_11 = UbChecks();
switchInt(_11) -> [0: bb5, otherwise: bb3];
}

bb1: {
Expand All @@ -78,28 +78,28 @@
}

bb3: {
StorageLive(_10);
_10 = const {0x1 as *mut ()};
_9 = NonNull::<T>::new_unchecked::precondition_check(const {0x1 as *mut ()}) -> [return: bb4, unwind unreachable];
StorageLive(_9);
_9 = const {0x1 as *mut ()};
_8 = NonNull::<T>::new_unchecked::precondition_check(const {0x1 as *mut ()}) -> [return: bb4, unwind unreachable];
}

bb4: {
StorageDead(_10);
StorageDead(_9);
goto -> bb5;
}

bb5: {
StorageDead(_8);
_11 = const {0x1 as *const [bool; 0]};
_10 = const {0x1 as *const [bool; 0]};
_5 = const NonNull::<[bool; 0]> {{ pointer: {0x1 as *const [bool; 0]} }};
StorageDead(_11);
StorageDead(_10);
StorageDead(_6);
_4 = const Unique::<[bool; 0]> {{ pointer: NonNull::<[bool; 0]> {{ pointer: {0x1 as *const [bool; 0]} }}, _marker: PhantomData::<[bool; 0]> }};
StorageDead(_5);
_3 = const Unique::<[bool]> {{ pointer: NonNull::<[bool]> {{ pointer: Indirect { alloc_id: ALLOC0, offset: Size(0 bytes) }: *const [bool] }}, _marker: PhantomData::<[bool]> }};
StorageDead(_4);
_2 = const Box::<[bool]>(Unique::<[bool]> {{ pointer: NonNull::<[bool]> {{ pointer: Indirect { alloc_id: ALLOC1, offset: Size(0 bytes) }: *const [bool] }}, _marker: PhantomData::<[bool]> }}, std::alloc::Global);
StorageDead(_9);
StorageDead(_8);
StorageDead(_3);
_1 = const A {{ foo: Box::<[bool]>(Unique::<[bool]> {{ pointer: NonNull::<[bool]> {{ pointer: Indirect { alloc_id: ALLOC2, offset: Size(0 bytes) }: *const [bool] }}, _marker: PhantomData::<[bool]> }}, std::alloc::Global) }};
StorageDead(_2);
Expand Down
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