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Disable MIR SROA optimization by default #115140

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Aug 23, 2023
+293 −213
Merged

Disable MIR SROA optimization by default #115140

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2 changes: 1 addition & 1 deletion compiler/rustc_mir_transform/src/sroa.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -12,7 +12,7 @@ pub struct ScalarReplacementOfAggregates;

impl<'tcx> MirPass<'tcx> for ScalarReplacementOfAggregates {
fn is_enabled(&self, sess: &rustc_session::Session) -> bool {
sess.mir_opt_level() >= 2
sess.mir_opt_level() >= 3
}

#[instrument(level = "debug", skip(self, tcx, body))]
Expand Down
2 changes: 1 addition & 1 deletion tests/incremental/hashes/match_expressions.rs
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Expand Up @@ -227,7 +227,7 @@ pub fn change_mutability_of_binding_in_pattern(x: u32) -> u32 {

// Ignore optimized_mir in cfail2, the only change to optimized MIR is a span.
#[cfg(not(any(cfail1,cfail4)))]
#[rustc_clean(cfg="cfail2", except="hir_owner_nodes,typeck")]
#[rustc_clean(cfg="cfail2", except="hir_owner_nodes,optimized_mir,typeck")]
#[rustc_clean(cfg="cfail3")]
#[rustc_clean(cfg="cfail5", except="hir_owner_nodes,optimized_mir,typeck")]
#[rustc_clean(cfg="cfail6")]
Expand Down
70 changes: 38 additions & 32 deletions tests/mir-opt/inline/inline_into_box_place.main.Inline.panic-abort.diff
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Expand Up @@ -33,36 +33,37 @@
+ debug ptr => _11;
+ scope 18 (inlined NonNull::<[u8]>::as_mut_ptr) {
+ debug self => _11;
+ let mut _15: std::ptr::NonNull<u8>;
+ let mut _16: std::ptr::NonNull<u8>;
+ scope 19 (inlined NonNull::<[u8]>::as_non_null_ptr) {
+ debug self => _11;
+ let mut _16: *mut u8;
+ let mut _17: *mut [u8];
+ let mut _17: *mut u8;
+ let mut _18: *mut [u8];
+ scope 20 {
+ scope 21 (inlined NonNull::<[u8]>::as_ptr) {
+ debug self => _11;
+ let mut _18: *const [u8];
+ let mut _19: *const [u8];
+ }
+ scope 22 (inlined ptr::mut_ptr::<impl *mut [u8]>::as_mut_ptr) {
+ debug self => _17;
+ debug self => _18;
+ }
+ scope 23 (inlined NonNull::<u8>::new_unchecked) {
+ debug ptr => _16;
+ let mut _19: *const u8;
+ debug ptr => _17;
+ let mut _20: *const u8;
+ let mut _21: *mut u8;
+ scope 24 {
+ scope 25 (inlined NonNull::<T>::new_unchecked::runtime::<u8>) {
+ debug ptr => _16;
+ debug ptr => _21;
+ scope 26 (inlined ptr::mut_ptr::<impl *mut u8>::is_null) {
+ debug self => _16;
+ let mut _20: *mut u8;
+ debug self => _21;
+ let mut _22: *mut u8;
+ scope 27 {
+ scope 28 (inlined ptr::mut_ptr::<impl *mut T>::is_null::runtime_impl) {
+ debug ptr => _20;
+ debug ptr => _22;
+ scope 29 (inlined ptr::mut_ptr::<impl *mut u8>::addr) {
+ debug self => _20;
+ debug self => _22;
+ scope 30 {
+ scope 31 (inlined ptr::mut_ptr::<impl *mut u8>::cast::<()>) {
+ debug self => _20;
+ debug self => _22;
+ }
+ }
+ }
Expand All @@ -75,8 +76,8 @@
+ }
+ }
+ scope 32 (inlined NonNull::<u8>::as_ptr) {
+ debug self => _15;
+ let mut _21: *const u8;
+ debug self => _16;
+ let mut _23: *const u8;
+ }
+ }
+ }
Expand All @@ -93,13 +94,14 @@
+ scope 10 {
+ scope 11 (inlined std::ptr::Alignment::new_unchecked) {
+ debug align => _5;
+ let mut _15: usize;
+ scope 12 {
+ scope 14 (inlined std::ptr::Alignment::new_unchecked::runtime) {
+ debug align => _5;
+ debug align => _15;
+ scope 15 (inlined core::num::<impl usize>::is_power_of_two) {
+ debug self => _5;
+ debug self => _15;
+ scope 16 (inlined core::num::<impl usize>::count_ones) {
+ debug self => _5;
+ debug self => _15;
+ }
+ }
+ }
Expand Down Expand Up @@ -129,7 +131,9 @@
+ StorageLive(_12);
+ StorageLive(_13);
+ StorageLive(_14);
+ StorageLive(_15);
+ _14 = _5 as std::ptr::Alignment (Transmute);
+ StorageDead(_15);
+ _8 = Layout { size: _4, align: move _14 };
+ StorageDead(_14);
+ StorageLive(_9);
Expand All @@ -153,27 +157,29 @@
+
+ bb4: {
+ _11 = ((_9 as Ok).0: std::ptr::NonNull<[u8]>);
+ StorageLive(_15);
+ StorageLive(_16);
+ StorageLive(_17);
+ StorageLive(_18);
+ _18 = (_11.0: *const [u8]);
+ _17 = move _18 as *mut [u8] (PtrToPtr);
+ StorageDead(_18);
+ _16 = _17 as *mut u8 (PtrToPtr);
+ StorageDead(_17);
+ StorageLive(_19);
+ StorageLive(_20);
+ _19 = _16 as *const u8 (PointerCoercion(MutToConstPointer));
+ _15 = NonNull::<u8> { pointer: _19 };
+ StorageDead(_20);
+ _19 = (_11.0: *const [u8]);
+ _18 = move _19 as *mut [u8] (PtrToPtr);
+ StorageDead(_19);
+ StorageDead(_16);
+ _17 = _18 as *mut u8 (PtrToPtr);
+ StorageDead(_18);
+ StorageLive(_20);
+ StorageLive(_21);
+ _21 = (_15.0: *const u8);
+ _6 = move _21 as *mut u8 (PtrToPtr);
+ StorageLive(_22);
+ _20 = _17 as *const u8 (PointerCoercion(MutToConstPointer));
+ _16 = NonNull::<u8> { pointer: _20 };
+ StorageDead(_22);
+ StorageDead(_21);
+ StorageDead(_15);
+ StorageDead(_20);
+ StorageDead(_17);
+ StorageLive(_23);
+ _23 = (_16.0: *const u8);
+ _6 = move _23 as *mut u8 (PtrToPtr);
+ StorageDead(_23);
+ StorageDead(_16);
+ StorageDead(_9);
+ StorageDead(_13);
+ StorageDead(_12);
Expand Down
70 changes: 38 additions & 32 deletions tests/mir-opt/inline/inline_into_box_place.main.Inline.panic-unwind.diff
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Original file line number Diff line number Diff line change
Expand Up @@ -33,36 +33,37 @@
+ debug ptr => _11;
+ scope 18 (inlined NonNull::<[u8]>::as_mut_ptr) {
+ debug self => _11;
+ let mut _15: std::ptr::NonNull<u8>;
+ let mut _16: std::ptr::NonNull<u8>;
+ scope 19 (inlined NonNull::<[u8]>::as_non_null_ptr) {
+ debug self => _11;
+ let mut _16: *mut u8;
+ let mut _17: *mut [u8];
+ let mut _17: *mut u8;
+ let mut _18: *mut [u8];
+ scope 20 {
+ scope 21 (inlined NonNull::<[u8]>::as_ptr) {
+ debug self => _11;
+ let mut _18: *const [u8];
+ let mut _19: *const [u8];
+ }
+ scope 22 (inlined ptr::mut_ptr::<impl *mut [u8]>::as_mut_ptr) {
+ debug self => _17;
+ debug self => _18;
+ }
+ scope 23 (inlined NonNull::<u8>::new_unchecked) {
+ debug ptr => _16;
+ let mut _19: *const u8;
+ debug ptr => _17;
+ let mut _20: *const u8;
+ let mut _21: *mut u8;
+ scope 24 {
+ scope 25 (inlined NonNull::<T>::new_unchecked::runtime::<u8>) {
+ debug ptr => _16;
+ debug ptr => _21;
+ scope 26 (inlined ptr::mut_ptr::<impl *mut u8>::is_null) {
+ debug self => _16;
+ let mut _20: *mut u8;
+ debug self => _21;
+ let mut _22: *mut u8;
+ scope 27 {
+ scope 28 (inlined ptr::mut_ptr::<impl *mut T>::is_null::runtime_impl) {
+ debug ptr => _20;
+ debug ptr => _22;
+ scope 29 (inlined ptr::mut_ptr::<impl *mut u8>::addr) {
+ debug self => _20;
+ debug self => _22;
+ scope 30 {
+ scope 31 (inlined ptr::mut_ptr::<impl *mut u8>::cast::<()>) {
+ debug self => _20;
+ debug self => _22;
+ }
+ }
+ }
Expand All @@ -75,8 +76,8 @@
+ }
+ }
+ scope 32 (inlined NonNull::<u8>::as_ptr) {
+ debug self => _15;
+ let mut _21: *const u8;
+ debug self => _16;
+ let mut _23: *const u8;
+ }
+ }
+ }
Expand All @@ -93,13 +94,14 @@
+ scope 10 {
+ scope 11 (inlined std::ptr::Alignment::new_unchecked) {
+ debug align => _5;
+ let mut _15: usize;
+ scope 12 {
+ scope 14 (inlined std::ptr::Alignment::new_unchecked::runtime) {
+ debug align => _5;
+ debug align => _15;
+ scope 15 (inlined core::num::<impl usize>::is_power_of_two) {
+ debug self => _5;
+ debug self => _15;
+ scope 16 (inlined core::num::<impl usize>::count_ones) {
+ debug self => _5;
+ debug self => _15;
+ }
+ }
+ }
Expand Down Expand Up @@ -129,7 +131,9 @@
+ StorageLive(_12);
+ StorageLive(_13);
+ StorageLive(_14);
+ StorageLive(_15);
+ _14 = _5 as std::ptr::Alignment (Transmute);
+ StorageDead(_15);
+ _8 = Layout { size: _4, align: move _14 };
+ StorageDead(_14);
+ StorageLive(_9);
Expand Down Expand Up @@ -170,27 +174,29 @@
+
+ bb6: {
+ _11 = ((_9 as Ok).0: std::ptr::NonNull<[u8]>);
+ StorageLive(_15);
+ StorageLive(_16);
+ StorageLive(_17);
+ StorageLive(_18);
+ _18 = (_11.0: *const [u8]);
+ _17 = move _18 as *mut [u8] (PtrToPtr);
+ StorageDead(_18);
+ _16 = _17 as *mut u8 (PtrToPtr);
+ StorageDead(_17);
+ StorageLive(_19);
+ StorageLive(_20);
+ _19 = _16 as *const u8 (PointerCoercion(MutToConstPointer));
+ _15 = NonNull::<u8> { pointer: _19 };
+ StorageDead(_20);
+ _19 = (_11.0: *const [u8]);
+ _18 = move _19 as *mut [u8] (PtrToPtr);
+ StorageDead(_19);
+ StorageDead(_16);
+ _17 = _18 as *mut u8 (PtrToPtr);
+ StorageDead(_18);
+ StorageLive(_20);
+ StorageLive(_21);
+ _21 = (_15.0: *const u8);
+ _6 = move _21 as *mut u8 (PtrToPtr);
+ StorageLive(_22);
+ _20 = _17 as *const u8 (PointerCoercion(MutToConstPointer));
+ _16 = NonNull::<u8> { pointer: _20 };
+ StorageDead(_22);
+ StorageDead(_21);
+ StorageDead(_15);
+ StorageDead(_20);
+ StorageDead(_17);
+ StorageLive(_23);
+ _23 = (_16.0: *const u8);
+ _6 = move _23 as *mut u8 (PtrToPtr);
+ StorageDead(_23);
+ StorageDead(_16);
+ StorageDead(_9);
+ StorageDead(_13);
+ StorageDead(_12);
Expand Down
34 changes: 23 additions & 11 deletions tests/mir-opt/pre-codegen/checked_ops.checked_shl.PreCodegen.after.mir
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Expand Up @@ -7,10 +7,13 @@ fn checked_shl(_1: u32, _2: u32) -> Option<u32> {
scope 1 (inlined core::num::<impl u32>::checked_shl) {
debug self => _1;
debug rhs => _2;
let mut _7: bool;
let mut _7: (u32, bool);
let _8: u32;
let _9: bool;
let mut _10: bool;
scope 2 {
debug a => _5;
debug b => _6;
debug a => _8;
debug b => _9;
}
scope 3 (inlined core::num::<impl u32>::overflowing_shl) {
debug self => _1;
Expand All @@ -35,26 +38,35 @@ fn checked_shl(_1: u32, _2: u32) -> Option<u32> {
}

bb0: {
StorageLive(_8);
StorageLive(_9);
StorageLive(_7);
StorageLive(_5);
StorageLive(_6);
StorageLive(_4);
StorageLive(_3);
_3 = const 31_u32;
_4 = BitAnd(_2, move _3);
StorageDead(_3);
_5 = ShlUnchecked(_1, _4);
StorageDead(_4);
StorageLive(_6);
_6 = Ge(_2, const _);
StorageLive(_7);
_7 = unlikely(_6) -> [return: bb1, unwind unreachable];
_7 = (move _5, move _6);
StorageDead(_6);
StorageDead(_5);
_8 = (_7.0: u32);
_9 = (_7.1: bool);
StorageDead(_7);
StorageLive(_10);
_10 = unlikely(_9) -> [return: bb1, unwind unreachable];
}

bb1: {
switchInt(move _7) -> [0: bb2, otherwise: bb3];
switchInt(move _10) -> [0: bb2, otherwise: bb3];
}

bb2: {
_0 = Option::<u32>::Some(_5);
_0 = Option::<u32>::Some(_8);
goto -> bb4;
}

Expand All @@ -64,9 +76,9 @@ fn checked_shl(_1: u32, _2: u32) -> Option<u32> {
}

bb4: {
StorageDead(_7);
StorageDead(_6);
StorageDead(_5);
StorageDead(_10);
StorageDead(_9);
StorageDead(_8);
return;
}
}
10 changes: 8 additions & 2 deletions tests/mir-opt/pre-codegen/mem_replace.mem_replace.PreCodegen.after.mir
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Expand Up @@ -15,18 +15,20 @@ fn mem_replace(_1: &mut u32, _2: u32) -> u32 {
scope 7 (inlined std::ptr::write::<u32>) {
debug dst => _4;
debug src => _2;
let mut _6: *mut u32;
scope 8 {
scope 9 (inlined std::ptr::write::runtime::<u32>) {
debug dst => _4;
debug dst => _6;
}
}
}
}
scope 4 (inlined std::ptr::read::<u32>) {
debug src => _3;
let mut _5: *const u32;
scope 5 {
scope 6 (inlined std::ptr::read::runtime::<u32>) {
debug src => _3;
debug src => _5;
}
}
}
Expand All @@ -36,11 +38,15 @@ fn mem_replace(_1: &mut u32, _2: u32) -> u32 {
bb0: {
StorageLive(_3);
_3 = &raw const (*_1);
StorageLive(_5);
_0 = (*_3);
StorageDead(_5);
StorageDead(_3);
StorageLive(_4);
_4 = &raw mut (*_1);
StorageLive(_6);
(*_4) = _2;
StorageDead(_6);
StorageDead(_4);
return;
}
Expand Down
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