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Lower unchecked_div/_rem to MIR's BinOp::Div/Rem #112168

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Merged
merged 5 commits into from
Jun 3, 2023
Merged

Lower unchecked_div/_rem to MIR's BinOp::Div/Rem #112168

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32cc106
Lower unchecked_{div, rem} to BinOp::{Div, Rem}
scottmcm Jun 1, 2023
bfb9233
remove unchecked_div/_rem from cg_cranelift
scottmcm Jun 1, 2023
dc353f1
remove unchecked_div/_rem from cg_ssa
scottmcm Jun 1, 2023
73f104b
remove unchecked_div/_rem from ctfe
scottmcm Jun 1, 2023
adb37d4
Clarify when MIR `Div`/`Rem` trigger UB
scottmcm Jun 2, 2023
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Lower unchecked_{div, rem} to BinOp::{Div, Rem}
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@scottmcm
scottmcm committed Jun 1, 2023
commit 32cc106af3486a6f390b7428dfc2414e7cbccb0c
51 changes: 28 additions & 23 deletions compiler/rustc_mir_transform/src/lower_intrinsics.rs
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Expand Up @@ -82,30 +82,35 @@ impl<'tcx> MirPass<'tcx> for LowerIntrinsics {
drop(args);
terminator.kind = TerminatorKind::Goto { target };
}
sym::wrapping_add | sym::wrapping_sub | sym::wrapping_mul => {
if let Some(target) = *target {
let lhs;
let rhs;
{
let mut args = args.drain(..);
lhs = args.next().unwrap();
rhs = args.next().unwrap();
}
let bin_op = match intrinsic_name {
sym::wrapping_add => BinOp::Add,
sym::wrapping_sub => BinOp::Sub,
sym::wrapping_mul => BinOp::Mul,
_ => bug!("unexpected intrinsic"),
};
block.statements.push(Statement {
source_info: terminator.source_info,
kind: StatementKind::Assign(Box::new((
*destination,
Rvalue::BinaryOp(bin_op, Box::new((lhs, rhs))),
))),
});
terminator.kind = TerminatorKind::Goto { target };
sym::wrapping_add
| sym::wrapping_sub
| sym::wrapping_mul
| sym::unchecked_div
| sym::unchecked_rem => {
let target = target.unwrap();
let lhs;
let rhs;
{
let mut args = args.drain(..);
lhs = args.next().unwrap();
rhs = args.next().unwrap();
}
let bin_op = match intrinsic_name {
sym::wrapping_add => BinOp::Add,
sym::wrapping_sub => BinOp::Sub,
sym::wrapping_mul => BinOp::Mul,
sym::unchecked_div => BinOp::Div,
sym::unchecked_rem => BinOp::Rem,
_ => bug!("unexpected intrinsic"),
};
block.statements.push(Statement {
source_info: terminator.source_info,
kind: StatementKind::Assign(Box::new((
*destination,
Rvalue::BinaryOp(bin_op, Box::new((lhs, rhs))),
))),
});
terminator.kind = TerminatorKind::Goto { target };
}
sym::add_with_overflow | sym::sub_with_overflow | sym::mul_with_overflow => {
if let Some(target) = *target {
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2 changes: 1 addition & 1 deletion tests/mir-opt/lower_intrinsics.align_of.LowerIntrinsics.diff
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Expand Up @@ -7,7 +7,7 @@
bb0: {
- _0 = std::intrinsics::min_align_of::<T>() -> [return: bb1, unwind unreachable]; // scope 0 at $DIR/lower_intrinsics.rs:+1:5: +1:42
- // mir::Constant
- // + span: $DIR/lower_intrinsics.rs:21:5: 21:40
- // + span: $DIR/lower_intrinsics.rs:27:5: 27:40
- // + literal: Const { ty: extern "rust-intrinsic" fn() -> usize {std::intrinsics::min_align_of::<T>}, val: Value(<ZST>) }
+ _0 = AlignOf(T); // scope 0 at $DIR/lower_intrinsics.rs:+1:5: +1:42
+ goto -> bb1; // scope 0 at $DIR/lower_intrinsics.rs:+1:5: +1:42
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2 changes: 1 addition & 1 deletion tests/mir-opt/lower_intrinsics.assume.LowerIntrinsics.diff
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Expand Up @@ -11,7 +11,7 @@
StorageLive(_1); // scope 1 at $DIR/lower_intrinsics.rs:+2:9: +2:38
- _1 = std::intrinsics::assume(const true) -> [return: bb1, unwind unreachable]; // scope 1 at $DIR/lower_intrinsics.rs:+2:9: +2:38
- // mir::Constant
- // + span: $DIR/lower_intrinsics.rs:106:9: 106:32
- // + span: $DIR/lower_intrinsics.rs:112:9: 112:32
- // + literal: Const { ty: unsafe extern "rust-intrinsic" fn(bool) {std::intrinsics::assume}, val: Value(<ZST>) }
+ assume(const true); // scope 1 at $DIR/lower_intrinsics.rs:+2:9: +2:38
+ goto -> bb1; // scope 1 at $DIR/lower_intrinsics.rs:+2:9: +2:38
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14 changes: 7 additions & 7 deletions tests/mir-opt/lower_intrinsics.discriminant.LowerIntrinsics.diff
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Expand Up @@ -31,7 +31,7 @@
_3 = &(*_4); // scope 0 at $DIR/lower_intrinsics.rs:+1:42: +1:44
- _2 = discriminant_value::<T>(move _3) -> [return: bb1, unwind unreachable]; // scope 0 at $DIR/lower_intrinsics.rs:+1:5: +1:45
- // mir::Constant
- // + span: $DIR/lower_intrinsics.rs:82:5: 82:41
- // + span: $DIR/lower_intrinsics.rs:88:5: 88:41
- // + literal: Const { ty: for<'a> extern "rust-intrinsic" fn(&'a T) -> <T as DiscriminantKind>::Discriminant {discriminant_value::<T>}, val: Value(<ZST>) }
+ _2 = discriminant((*_3)); // scope 0 at $DIR/lower_intrinsics.rs:+1:5: +1:45
+ goto -> bb1; // scope 0 at $DIR/lower_intrinsics.rs:+1:5: +1:45
Expand All @@ -46,13 +46,13 @@
StorageLive(_7); // scope 0 at $DIR/lower_intrinsics.rs:+2:42: +2:44
_19 = const _; // scope 0 at $DIR/lower_intrinsics.rs:+2:42: +2:44
// mir::Constant
// + span: $DIR/lower_intrinsics.rs:83:42: 83:44
// + span: $DIR/lower_intrinsics.rs:89:42: 89:44
// + literal: Const { ty: &i32, val: Unevaluated(discriminant, [T], Some(promoted[2])) }
_7 = &(*_19); // scope 0 at $DIR/lower_intrinsics.rs:+2:42: +2:44
_6 = &(*_7); // scope 0 at $DIR/lower_intrinsics.rs:+2:42: +2:44
- _5 = discriminant_value::<i32>(move _6) -> [return: bb2, unwind unreachable]; // scope 0 at $DIR/lower_intrinsics.rs:+2:5: +2:45
- // mir::Constant
- // + span: $DIR/lower_intrinsics.rs:83:5: 83:41
- // + span: $DIR/lower_intrinsics.rs:89:5: 89:41
- // + literal: Const { ty: for<'a> extern "rust-intrinsic" fn(&'a i32) -> <i32 as DiscriminantKind>::Discriminant {discriminant_value::<i32>}, val: Value(<ZST>) }
+ _5 = discriminant((*_6)); // scope 0 at $DIR/lower_intrinsics.rs:+2:5: +2:45
+ goto -> bb2; // scope 0 at $DIR/lower_intrinsics.rs:+2:5: +2:45
Expand All @@ -67,13 +67,13 @@
StorageLive(_11); // scope 0 at $DIR/lower_intrinsics.rs:+3:42: +3:45
_18 = const _; // scope 0 at $DIR/lower_intrinsics.rs:+3:42: +3:45
// mir::Constant
// + span: $DIR/lower_intrinsics.rs:84:42: 84:45
// + span: $DIR/lower_intrinsics.rs:90:42: 90:45
// + literal: Const { ty: &(), val: Unevaluated(discriminant, [T], Some(promoted[1])) }
_11 = &(*_18); // scope 0 at $DIR/lower_intrinsics.rs:+3:42: +3:45
_10 = &(*_11); // scope 0 at $DIR/lower_intrinsics.rs:+3:42: +3:45
- _9 = discriminant_value::<()>(move _10) -> [return: bb3, unwind unreachable]; // scope 0 at $DIR/lower_intrinsics.rs:+3:5: +3:46
- // mir::Constant
- // + span: $DIR/lower_intrinsics.rs:84:5: 84:41
- // + span: $DIR/lower_intrinsics.rs:90:5: 90:41
- // + literal: Const { ty: for<'a> extern "rust-intrinsic" fn(&'a ()) -> <() as DiscriminantKind>::Discriminant {discriminant_value::<()>}, val: Value(<ZST>) }
+ _9 = discriminant((*_10)); // scope 0 at $DIR/lower_intrinsics.rs:+3:5: +3:46
+ goto -> bb3; // scope 0 at $DIR/lower_intrinsics.rs:+3:5: +3:46
Expand All @@ -88,13 +88,13 @@
StorageLive(_15); // scope 0 at $DIR/lower_intrinsics.rs:+4:42: +4:47
_17 = const _; // scope 0 at $DIR/lower_intrinsics.rs:+4:42: +4:47
// mir::Constant
// + span: $DIR/lower_intrinsics.rs:85:42: 85:47
// + span: $DIR/lower_intrinsics.rs:91:42: 91:47
// + literal: Const { ty: &E, val: Unevaluated(discriminant, [T], Some(promoted[0])) }
_15 = &(*_17); // scope 0 at $DIR/lower_intrinsics.rs:+4:42: +4:47
_14 = &(*_15); // scope 0 at $DIR/lower_intrinsics.rs:+4:42: +4:47
- _13 = discriminant_value::<E>(move _14) -> [return: bb4, unwind unreachable]; // scope 0 at $DIR/lower_intrinsics.rs:+4:5: +4:48
- // mir::Constant
- // + span: $DIR/lower_intrinsics.rs:85:5: 85:41
- // + span: $DIR/lower_intrinsics.rs:91:5: 91:41
- // + literal: Const { ty: for<'a> extern "rust-intrinsic" fn(&'a E) -> <E as DiscriminantKind>::Discriminant {discriminant_value::<E>}, val: Value(<ZST>) }
+ _13 = discriminant((*_14)); // scope 0 at $DIR/lower_intrinsics.rs:+4:5: +4:48
+ goto -> bb4; // scope 0 at $DIR/lower_intrinsics.rs:+4:5: +4:48
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2 changes: 1 addition & 1 deletion tests/mir-opt/lower_intrinsics.f_copy_nonoverlapping.LowerIntrinsics.diff
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Expand Up @@ -49,7 +49,7 @@
StorageDead(_9); // scope 3 at $DIR/lower_intrinsics.rs:+4:90: +4:91
- _3 = copy_nonoverlapping::<i32>(move _4, move _8, const 0_usize) -> [return: bb1, unwind unreachable]; // scope 3 at $DIR/lower_intrinsics.rs:+4:9: +4:95
- // mir::Constant
- // + span: $DIR/lower_intrinsics.rs:99:9: 99:28
- // + span: $DIR/lower_intrinsics.rs:105:9: 105:28
- // + literal: Const { ty: unsafe extern "rust-intrinsic" fn(*const i32, *mut i32, usize) {copy_nonoverlapping::<i32>}, val: Value(<ZST>) }
+ copy_nonoverlapping(dst = move _8, src = move _4, count = const 0_usize); // scope 3 at $DIR/lower_intrinsics.rs:+4:9: +4:95
+ goto -> bb1; // scope 3 at $DIR/lower_intrinsics.rs:+4:9: +4:95
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2 changes: 1 addition & 1 deletion tests/mir-opt/lower_intrinsics.forget.LowerIntrinsics.diff
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Expand Up @@ -11,7 +11,7 @@
_2 = move _1; // scope 0 at $DIR/lower_intrinsics.rs:+1:30: +1:31
- _0 = std::intrinsics::forget::<T>(move _2) -> [return: bb1, unwind unreachable]; // scope 0 at $DIR/lower_intrinsics.rs:+1:5: +1:32
- // mir::Constant
- // + span: $DIR/lower_intrinsics.rs:26:5: 26:29
- // + span: $DIR/lower_intrinsics.rs:32:5: 32:29
- // + literal: Const { ty: extern "rust-intrinsic" fn(T) {std::intrinsics::forget::<T>}, val: Value(<ZST>) }
+ _0 = const (); // scope 0 at $DIR/lower_intrinsics.rs:+1:5: +1:32
+ goto -> bb1; // scope 0 at $DIR/lower_intrinsics.rs:+1:5: +1:32
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2 changes: 1 addition & 1 deletion tests/mir-opt/lower_intrinsics.non_const.LowerIntrinsics.diff
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Expand Up @@ -13,7 +13,7 @@
StorageLive(_1); // scope 0 at $DIR/lower_intrinsics.rs:+2:9: +2:18
_1 = std::intrinsics::size_of::<T>; // scope 0 at $DIR/lower_intrinsics.rs:+2:21: +2:51
// mir::Constant
// + span: $DIR/lower_intrinsics.rs:37:21: 37:51
// + span: $DIR/lower_intrinsics.rs:43:21: 43:51
// + literal: Const { ty: extern "rust-intrinsic" fn() -> usize {std::intrinsics::size_of::<T>}, val: Value(<ZST>) }
StorageLive(_2); // scope 1 at $DIR/lower_intrinsics.rs:+3:5: +3:14
_2 = _1; // scope 1 at $DIR/lower_intrinsics.rs:+3:5: +3:14
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4 changes: 2 additions & 2 deletions tests/mir-opt/lower_intrinsics.option_payload.LowerIntrinsics.diff
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Expand Up @@ -24,7 +24,7 @@
_4 = &raw const (*_1); // scope 1 at $DIR/lower_intrinsics.rs:+2:55: +2:56
- _3 = option_payload_ptr::<usize>(move _4) -> [return: bb1, unwind unreachable]; // scope 1 at $DIR/lower_intrinsics.rs:+2:18: +2:57
- // mir::Constant
- // + span: $DIR/lower_intrinsics.rs:137:18: 137:54
- // + span: $DIR/lower_intrinsics.rs:143:18: 143:54
- // + literal: Const { ty: unsafe extern "rust-intrinsic" fn(*const Option<usize>) -> *const usize {option_payload_ptr::<usize>}, val: Value(<ZST>) }
+ _3 = &raw const (((*_4) as Some).0: usize); // scope 1 at $DIR/lower_intrinsics.rs:+2:18: +2:57
+ goto -> bb1; // scope 1 at $DIR/lower_intrinsics.rs:+2:18: +2:57
Expand All @@ -37,7 +37,7 @@
_6 = &raw const (*_2); // scope 2 at $DIR/lower_intrinsics.rs:+3:55: +3:56
- _5 = option_payload_ptr::<String>(move _6) -> [return: bb2, unwind unreachable]; // scope 2 at $DIR/lower_intrinsics.rs:+3:18: +3:57
- // mir::Constant
- // + span: $DIR/lower_intrinsics.rs:138:18: 138:54
- // + span: $DIR/lower_intrinsics.rs:144:18: 144:54
- // + literal: Const { ty: unsafe extern "rust-intrinsic" fn(*const Option<String>) -> *const String {option_payload_ptr::<String>}, val: Value(<ZST>) }
+ _5 = &raw const (((*_6) as Some).0: std::string::String); // scope 2 at $DIR/lower_intrinsics.rs:+3:18: +3:57
+ goto -> bb2; // scope 2 at $DIR/lower_intrinsics.rs:+3:18: +3:57
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2 changes: 1 addition & 1 deletion tests/mir-opt/lower_intrinsics.ptr_offset.LowerIntrinsics.diff
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Expand Up @@ -15,7 +15,7 @@
_4 = _2; // scope 0 at $DIR/lower_intrinsics.rs:+1:33: +1:34
- _0 = offset::<*const i32, isize>(move _3, move _4) -> [return: bb1, unwind unreachable]; // scope 0 at $DIR/lower_intrinsics.rs:+1:5: +1:35
- // mir::Constant
- // + span: $DIR/lower_intrinsics.rs:144:5: 144:29
- // + span: $DIR/lower_intrinsics.rs:150:5: 150:29
- // + literal: Const { ty: unsafe extern "rust-intrinsic" fn(*const i32, isize) -> *const i32 {offset::<*const i32, isize>}, val: Value(<ZST>) }
+ _0 = Offset(move _3, move _4); // scope 0 at $DIR/lower_intrinsics.rs:+1:5: +1:35
+ goto -> bb1; // scope 0 at $DIR/lower_intrinsics.rs:+1:5: +1:35
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2 changes: 1 addition & 1 deletion tests/mir-opt/lower_intrinsics.read_via_copy_primitive.LowerIntrinsics.diff
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Expand Up @@ -13,7 +13,7 @@
_2 = &raw const (*_1); // scope 1 at $DIR/lower_intrinsics.rs:+1:46: +1:47
- _0 = read_via_copy::<i32>(move _2) -> [return: bb1, unwind unreachable]; // scope 1 at $DIR/lower_intrinsics.rs:+1:14: +1:48
- // mir::Constant
- // + span: $DIR/lower_intrinsics.rs:119:14: 119:45
- // + span: $DIR/lower_intrinsics.rs:125:14: 125:45
- // + literal: Const { ty: unsafe extern "rust-intrinsic" fn(*const i32) -> i32 {read_via_copy::<i32>}, val: Value(<ZST>) }
+ _0 = (*_2); // scope 1 at $DIR/lower_intrinsics.rs:+1:14: +1:48
+ goto -> bb1; // scope 1 at $DIR/lower_intrinsics.rs:+1:14: +1:48
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2 changes: 1 addition & 1 deletion tests/mir-opt/lower_intrinsics.read_via_copy_uninhabited.LowerIntrinsics.diff
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Expand Up @@ -13,7 +13,7 @@
_2 = &raw const (*_1); // scope 1 at $DIR/lower_intrinsics.rs:+1:46: +1:47
- _0 = read_via_copy::<Never>(move _2) -> unwind unreachable; // scope 1 at $DIR/lower_intrinsics.rs:+1:14: +1:48
- // mir::Constant
- // + span: $DIR/lower_intrinsics.rs:124:14: 124:45
- // + span: $DIR/lower_intrinsics.rs:130:14: 130:45
- // + literal: Const { ty: unsafe extern "rust-intrinsic" fn(*const Never) -> Never {read_via_copy::<Never>}, val: Value(<ZST>) }
+ unreachable; // scope 1 at $DIR/lower_intrinsics.rs:+1:14: +1:48
}
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6 changes: 6 additions & 0 deletions tests/mir-opt/lower_intrinsics.rs
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Expand Up @@ -11,6 +11,12 @@ pub fn wrapping(a: i32, b: i32) {
let _z = core::intrinsics::wrapping_mul(a, b);
}

// EMIT_MIR lower_intrinsics.unchecked.LowerIntrinsics.diff
pub unsafe fn unchecked(a: i32, b: i32) {
let _x = core::intrinsics::unchecked_div(a, b);
let _y = core::intrinsics::unchecked_rem(a, b);
}

// EMIT_MIR lower_intrinsics.size_of.LowerIntrinsics.diff
pub fn size_of<T>() -> usize {
core::intrinsics::size_of::<T>()
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2 changes: 1 addition & 1 deletion tests/mir-opt/lower_intrinsics.size_of.LowerIntrinsics.diff
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Expand Up @@ -7,7 +7,7 @@
bb0: {
- _0 = std::intrinsics::size_of::<T>() -> [return: bb1, unwind unreachable]; // scope 0 at $DIR/lower_intrinsics.rs:+1:5: +1:37
- // mir::Constant
- // + span: $DIR/lower_intrinsics.rs:16:5: 16:35
- // + span: $DIR/lower_intrinsics.rs:22:5: 22:35
- // + literal: Const { ty: extern "rust-intrinsic" fn() -> usize {std::intrinsics::size_of::<T>}, val: Value(<ZST>) }
+ _0 = SizeOf(T); // scope 0 at $DIR/lower_intrinsics.rs:+1:5: +1:37
+ goto -> bb1; // scope 0 at $DIR/lower_intrinsics.rs:+1:5: +1:37
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2 changes: 1 addition & 1 deletion tests/mir-opt/lower_intrinsics.transmute_inhabited.LowerIntrinsics.diff
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Expand Up @@ -13,7 +13,7 @@
_2 = _1; // scope 1 at $DIR/lower_intrinsics.rs:+1:34: +1:35
- _0 = transmute::<std::cmp::Ordering, i8>(move _2) -> [return: bb1, unwind unreachable]; // scope 1 at $DIR/lower_intrinsics.rs:+1:14: +1:36
- // mir::Constant
- // + span: $DIR/lower_intrinsics.rs:43:14: 43:33
- // + span: $DIR/lower_intrinsics.rs:49:14: 49:33
- // + literal: Const { ty: unsafe extern "rust-intrinsic" fn(std::cmp::Ordering) -> i8 {transmute::<std::cmp::Ordering, i8>}, val: Value(<ZST>) }
+ _0 = move _2 as i8 (Transmute); // scope 1 at $DIR/lower_intrinsics.rs:+1:14: +1:36
+ goto -> bb1; // scope 1 at $DIR/lower_intrinsics.rs:+1:14: +1:36
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2 changes: 1 addition & 1 deletion tests/mir-opt/lower_intrinsics.transmute_ref_dst.LowerIntrinsics.diff
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Expand Up @@ -13,7 +13,7 @@
_2 = _1; // scope 1 at $DIR/lower_intrinsics.rs:+1:34: +1:35
- _0 = transmute::<&T, *const T>(move _2) -> [return: bb1, unwind unreachable]; // scope 1 at $DIR/lower_intrinsics.rs:+1:14: +1:36
- // mir::Constant
- // + span: $DIR/lower_intrinsics.rs:53:14: 53:33
- // + span: $DIR/lower_intrinsics.rs:59:14: 59:33
- // + literal: Const { ty: unsafe extern "rust-intrinsic" fn(&T) -> *const T {transmute::<&T, *const T>}, val: Value(<ZST>) }
+ _0 = move _2 as *const T (Transmute); // scope 1 at $DIR/lower_intrinsics.rs:+1:14: +1:36
+ goto -> bb1; // scope 1 at $DIR/lower_intrinsics.rs:+1:14: +1:36
Expand Down
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