Rollup merge of #73130 - wesleywiser:remove_const_prop_for_indirects, r=oli-obk
Remove const prop for indirects This was only used by one mir-opt test and since it causes buggy behavior under `-Zmir-opt-level=2`, it seems like we should remove it. This was split out from #71946. Closes #72679 Closes #72372 Closes #72285
This commit is contained in:
Ralf Jung
GitHub
commit
098949b504
@ -293,7 +293,6 @@ pub enum InternKind {
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Static(hir::Mutability),
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Constant,
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Promoted,
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ConstProp,
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}
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/// Intern `ret` and everything it references.
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@ -314,9 +313,7 @@ pub fn intern_const_alloc_recursive<M: CompileTimeMachine<'mir, 'tcx>>(
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let base_intern_mode = match intern_kind {
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InternKind::Static(mutbl) => InternMode::Static(mutbl),
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// FIXME: what about array lengths, array initializers?
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InternKind::Constant | InternKind::ConstProp | InternKind::Promoted => {
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InternMode::ConstBase
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}
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InternKind::Constant | InternKind::Promoted => InternMode::ConstBase,
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};
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// Type based interning.
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@ -358,7 +355,10 @@ pub fn intern_const_alloc_recursive<M: CompileTimeMachine<'mir, 'tcx>>(
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Err(error) => {
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ecx.tcx.sess.delay_span_bug(
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ecx.tcx.span,
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"error during interning should later cause validation failure",
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&format!(
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"error during interning should later cause validation failure: {}",
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error
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),
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);
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// Some errors shouldn't come up because creating them causes
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// an allocation, which we should avoid. When that happens,
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@ -399,7 +399,7 @@ pub fn intern_const_alloc_recursive<M: CompileTimeMachine<'mir, 'tcx>>(
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// immutability is so important.
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alloc.mutability = Mutability::Not;
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}
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InternKind::Constant | InternKind::ConstProp => {
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InternKind::Constant => {
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// If it's a constant, we should not have any "leftovers" as everything
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// is tracked by const-checking.
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// FIXME: downgrade this to a warning? It rejects some legitimate consts,
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@ -27,9 +27,9 @@
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use crate::const_eval::error_to_const_error;
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use crate::interpret::{
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self, compile_time_machine, intern_const_alloc_recursive, AllocId, Allocation, Frame, ImmTy,
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Immediate, InternKind, InterpCx, LocalState, LocalValue, Memory, MemoryKind, OpTy,
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Operand as InterpOperand, PlaceTy, Pointer, ScalarMaybeUninit, StackPopCleanup,
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self, compile_time_machine, AllocId, Allocation, Frame, ImmTy, Immediate, InterpCx, LocalState,
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LocalValue, Memory, MemoryKind, OpTy, Operand as InterpOperand, PlaceTy, Pointer,
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ScalarMaybeUninit, StackPopCleanup,
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};
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use crate::transform::{MirPass, MirSource};
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@ -702,11 +702,6 @@ fn should_const_prop(&mut self, op: OpTy<'tcx>) -> bool {
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ScalarMaybeUninit::Scalar(l),
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ScalarMaybeUninit::Scalar(r),
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)) => l.is_bits() && r.is_bits(),
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interpret::Operand::Indirect(_) if mir_opt_level >= 2 => {
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let mplace = op.assert_mem_place(&self.ecx);
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intern_const_alloc_recursive(&mut self.ecx, InternKind::ConstProp, mplace, false);
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true
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}
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_ => false,
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}
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}
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@ -1,5 +1,10 @@
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// compile-flags: -O
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// FIXME(wesleywiser): Ideally, we could const-prop away all of this and just be left with
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// `let x = 42` but that doesn't work because const-prop doesn't support `Operand::Indirect`
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// and `InterpCx::eval_place()` always forces an allocation which creates the `Indirect`.
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// Fixing either of those will allow us to const-prop this away.
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// EMIT_MIR_FOR_EACH_BIT_WIDTH
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// EMIT_MIR rustc.main.ConstProp.diff
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fn main() {
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@ -2,100 +2,93 @@
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+ // MIR for `main` after ConstProp
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fn main() -> () {
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let mut _0: (); // return place in scope 0 at $DIR/discriminant.rs:5:11: 5:11
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let _1: i32; // in scope 0 at $DIR/discriminant.rs:6:9: 6:10
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let mut _2: i32; // in scope 0 at $DIR/discriminant.rs:6:13: 6:64
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let mut _3: std::option::Option<bool>; // in scope 0 at $DIR/discriminant.rs:6:34: 6:44
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let mut _4: isize; // in scope 0 at $DIR/discriminant.rs:6:21: 6:31
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let mut _0: (); // return place in scope 0 at $DIR/discriminant.rs:10:11: 10:11
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let _1: i32; // in scope 0 at $DIR/discriminant.rs:11:9: 11:10
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let mut _2: i32; // in scope 0 at $DIR/discriminant.rs:11:13: 11:64
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let mut _3: std::option::Option<bool>; // in scope 0 at $DIR/discriminant.rs:11:34: 11:44
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let mut _4: isize; // in scope 0 at $DIR/discriminant.rs:11:21: 11:31
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scope 1 {
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debug x => _1; // in scope 1 at $DIR/discriminant.rs:6:9: 6:10
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debug x => _1; // in scope 1 at $DIR/discriminant.rs:11:9: 11:10
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}
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bb0: {
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StorageLive(_1); // scope 0 at $DIR/discriminant.rs:6:9: 6:10
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StorageLive(_2); // scope 0 at $DIR/discriminant.rs:6:13: 6:64
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StorageLive(_3); // scope 0 at $DIR/discriminant.rs:6:34: 6:44
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- _3 = std::option::Option::<bool>::Some(const true); // scope 0 at $DIR/discriminant.rs:6:34: 6:44
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+ _3 = const std::option::Option::<bool>::Some(true); // scope 0 at $DIR/discriminant.rs:6:34: 6:44
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StorageLive(_1); // scope 0 at $DIR/discriminant.rs:11:9: 11:10
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StorageLive(_2); // scope 0 at $DIR/discriminant.rs:11:13: 11:64
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StorageLive(_3); // scope 0 at $DIR/discriminant.rs:11:34: 11:44
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- _3 = std::option::Option::<bool>::Some(const true); // scope 0 at $DIR/discriminant.rs:11:34: 11:44
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+ _3 = const std::option::Option::<bool>::Some(true); // scope 0 at $DIR/discriminant.rs:11:34: 11:44
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// ty::Const
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- // + ty: bool
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+ // + ty: std::option::Option<bool>
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// + val: Value(Scalar(0x01))
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// mir::Constant
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- // + span: $DIR/discriminant.rs:6:39: 6:43
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- // + span: $DIR/discriminant.rs:11:39: 11:43
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- // + literal: Const { ty: bool, val: Value(Scalar(0x01)) }
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- _4 = discriminant(_3); // scope 0 at $DIR/discriminant.rs:6:21: 6:31
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- switchInt(move _4) -> [1isize: bb2, otherwise: bb1]; // scope 0 at $DIR/discriminant.rs:6:21: 6:31
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+ // + span: $DIR/discriminant.rs:6:34: 6:44
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- _4 = discriminant(_3); // scope 0 at $DIR/discriminant.rs:11:21: 11:31
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- switchInt(move _4) -> [1isize: bb2, otherwise: bb1]; // scope 0 at $DIR/discriminant.rs:11:21: 11:31
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+ // + span: $DIR/discriminant.rs:11:34: 11:44
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+ // + literal: Const { ty: std::option::Option<bool>, val: Value(Scalar(0x01)) }
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+ _4 = const 1isize; // scope 0 at $DIR/discriminant.rs:6:21: 6:31
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+ _4 = const 1isize; // scope 0 at $DIR/discriminant.rs:11:21: 11:31
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+ // ty::Const
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+ // + ty: isize
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+ // + val: Value(Scalar(0x00000001))
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+ // mir::Constant
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+ // + span: $DIR/discriminant.rs:6:21: 6:31
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+ // + span: $DIR/discriminant.rs:11:21: 11:31
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+ // + literal: Const { ty: isize, val: Value(Scalar(0x00000001)) }
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+ switchInt(const 1isize) -> [1isize: bb2, otherwise: bb1]; // scope 0 at $DIR/discriminant.rs:6:21: 6:31
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+ switchInt(const 1isize) -> [1isize: bb2, otherwise: bb1]; // scope 0 at $DIR/discriminant.rs:11:21: 11:31
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+ // ty::Const
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+ // + ty: isize
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+ // + val: Value(Scalar(0x00000001))
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+ // mir::Constant
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+ // + span: $DIR/discriminant.rs:6:21: 6:31
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+ // + span: $DIR/discriminant.rs:11:21: 11:31
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+ // + literal: Const { ty: isize, val: Value(Scalar(0x00000001)) }
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}
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bb1: {
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_2 = const 10i32; // scope 0 at $DIR/discriminant.rs:6:59: 6:61
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_2 = const 10i32; // scope 0 at $DIR/discriminant.rs:11:59: 11:61
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// ty::Const
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// + ty: i32
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// + val: Value(Scalar(0x0000000a))
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// mir::Constant
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// + span: $DIR/discriminant.rs:6:59: 6:61
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// + span: $DIR/discriminant.rs:11:59: 11:61
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// + literal: Const { ty: i32, val: Value(Scalar(0x0000000a)) }
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goto -> bb4; // scope 0 at $DIR/discriminant.rs:6:13: 6:64
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goto -> bb4; // scope 0 at $DIR/discriminant.rs:11:13: 11:64
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}
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bb2: {
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- switchInt(((_3 as Some).0: bool)) -> [false: bb1, otherwise: bb3]; // scope 0 at $DIR/discriminant.rs:6:26: 6:30
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+ switchInt(const true) -> [false: bb1, otherwise: bb3]; // scope 0 at $DIR/discriminant.rs:6:26: 6:30
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+ // ty::Const
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+ // + ty: bool
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+ // + val: Value(Scalar(0x01))
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+ // mir::Constant
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+ // + span: $DIR/discriminant.rs:6:26: 6:30
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+ // + literal: Const { ty: bool, val: Value(Scalar(0x01)) }
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switchInt(((_3 as Some).0: bool)) -> [false: bb1, otherwise: bb3]; // scope 0 at $DIR/discriminant.rs:11:26: 11:30
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}
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bb3: {
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_2 = const 42i32; // scope 0 at $DIR/discriminant.rs:6:47: 6:49
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_2 = const 42i32; // scope 0 at $DIR/discriminant.rs:11:47: 11:49
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// ty::Const
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// + ty: i32
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// + val: Value(Scalar(0x0000002a))
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// mir::Constant
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// + span: $DIR/discriminant.rs:6:47: 6:49
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// + span: $DIR/discriminant.rs:11:47: 11:49
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// + literal: Const { ty: i32, val: Value(Scalar(0x0000002a)) }
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goto -> bb4; // scope 0 at $DIR/discriminant.rs:6:13: 6:64
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goto -> bb4; // scope 0 at $DIR/discriminant.rs:11:13: 11:64
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}
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bb4: {
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_1 = Add(move _2, const 0i32); // scope 0 at $DIR/discriminant.rs:6:13: 6:68
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_1 = Add(move _2, const 0i32); // scope 0 at $DIR/discriminant.rs:11:13: 11:68
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// ty::Const
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// + ty: i32
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// + val: Value(Scalar(0x00000000))
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// mir::Constant
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// + span: $DIR/discriminant.rs:6:67: 6:68
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// + span: $DIR/discriminant.rs:11:67: 11:68
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// + literal: Const { ty: i32, val: Value(Scalar(0x00000000)) }
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StorageDead(_2); // scope 0 at $DIR/discriminant.rs:6:67: 6:68
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StorageDead(_3); // scope 0 at $DIR/discriminant.rs:6:68: 6:69
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_0 = const (); // scope 0 at $DIR/discriminant.rs:5:11: 7:2
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StorageDead(_2); // scope 0 at $DIR/discriminant.rs:11:67: 11:68
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StorageDead(_3); // scope 0 at $DIR/discriminant.rs:11:68: 11:69
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_0 = const (); // scope 0 at $DIR/discriminant.rs:10:11: 12:2
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// ty::Const
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// + ty: ()
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// + val: Value(Scalar(<ZST>))
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// mir::Constant
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// + span: $DIR/discriminant.rs:5:11: 7:2
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// + span: $DIR/discriminant.rs:10:11: 12:2
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// + literal: Const { ty: (), val: Value(Scalar(<ZST>)) }
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StorageDead(_1); // scope 0 at $DIR/discriminant.rs:7:1: 7:2
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return; // scope 0 at $DIR/discriminant.rs:7:2: 7:2
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StorageDead(_1); // scope 0 at $DIR/discriminant.rs:12:1: 12:2
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return; // scope 0 at $DIR/discriminant.rs:12:2: 12:2
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}
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}
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@ -2,100 +2,93 @@
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+ // MIR for `main` after ConstProp
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fn main() -> () {
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let mut _0: (); // return place in scope 0 at $DIR/discriminant.rs:5:11: 5:11
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let _1: i32; // in scope 0 at $DIR/discriminant.rs:6:9: 6:10
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let mut _2: i32; // in scope 0 at $DIR/discriminant.rs:6:13: 6:64
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let mut _3: std::option::Option<bool>; // in scope 0 at $DIR/discriminant.rs:6:34: 6:44
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let mut _4: isize; // in scope 0 at $DIR/discriminant.rs:6:21: 6:31
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let mut _0: (); // return place in scope 0 at $DIR/discriminant.rs:10:11: 10:11
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let _1: i32; // in scope 0 at $DIR/discriminant.rs:11:9: 11:10
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let mut _2: i32; // in scope 0 at $DIR/discriminant.rs:11:13: 11:64
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let mut _3: std::option::Option<bool>; // in scope 0 at $DIR/discriminant.rs:11:34: 11:44
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let mut _4: isize; // in scope 0 at $DIR/discriminant.rs:11:21: 11:31
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scope 1 {
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debug x => _1; // in scope 1 at $DIR/discriminant.rs:6:9: 6:10
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debug x => _1; // in scope 1 at $DIR/discriminant.rs:11:9: 11:10
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||||
}
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bb0: {
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StorageLive(_1); // scope 0 at $DIR/discriminant.rs:6:9: 6:10
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||||
StorageLive(_2); // scope 0 at $DIR/discriminant.rs:6:13: 6:64
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||||
StorageLive(_3); // scope 0 at $DIR/discriminant.rs:6:34: 6:44
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- _3 = std::option::Option::<bool>::Some(const true); // scope 0 at $DIR/discriminant.rs:6:34: 6:44
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+ _3 = const std::option::Option::<bool>::Some(true); // scope 0 at $DIR/discriminant.rs:6:34: 6:44
|
||||
StorageLive(_1); // scope 0 at $DIR/discriminant.rs:11:9: 11:10
|
||||
StorageLive(_2); // scope 0 at $DIR/discriminant.rs:11:13: 11:64
|
||||
StorageLive(_3); // scope 0 at $DIR/discriminant.rs:11:34: 11:44
|
||||
- _3 = std::option::Option::<bool>::Some(const true); // scope 0 at $DIR/discriminant.rs:11:34: 11:44
|
||||
+ _3 = const std::option::Option::<bool>::Some(true); // scope 0 at $DIR/discriminant.rs:11:34: 11:44
|
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// ty::Const
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- // + ty: bool
|
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+ // + ty: std::option::Option<bool>
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// + val: Value(Scalar(0x01))
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// mir::Constant
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- // + span: $DIR/discriminant.rs:6:39: 6:43
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||||
- // + span: $DIR/discriminant.rs:11:39: 11:43
|
||||
- // + literal: Const { ty: bool, val: Value(Scalar(0x01)) }
|
||||
- _4 = discriminant(_3); // scope 0 at $DIR/discriminant.rs:6:21: 6:31
|
||||
- switchInt(move _4) -> [1isize: bb2, otherwise: bb1]; // scope 0 at $DIR/discriminant.rs:6:21: 6:31
|
||||
+ // + span: $DIR/discriminant.rs:6:34: 6:44
|
||||
- _4 = discriminant(_3); // scope 0 at $DIR/discriminant.rs:11:21: 11:31
|
||||
- switchInt(move _4) -> [1isize: bb2, otherwise: bb1]; // scope 0 at $DIR/discriminant.rs:11:21: 11:31
|
||||
+ // + span: $DIR/discriminant.rs:11:34: 11:44
|
||||
+ // + literal: Const { ty: std::option::Option<bool>, val: Value(Scalar(0x01)) }
|
||||
+ _4 = const 1isize; // scope 0 at $DIR/discriminant.rs:6:21: 6:31
|
||||
+ _4 = const 1isize; // scope 0 at $DIR/discriminant.rs:11:21: 11:31
|
||||
+ // ty::Const
|
||||
+ // + ty: isize
|
||||
+ // + val: Value(Scalar(0x0000000000000001))
|
||||
+ // mir::Constant
|
||||
+ // + span: $DIR/discriminant.rs:6:21: 6:31
|
||||
+ // + span: $DIR/discriminant.rs:11:21: 11:31
|
||||
+ // + literal: Const { ty: isize, val: Value(Scalar(0x0000000000000001)) }
|
||||
+ switchInt(const 1isize) -> [1isize: bb2, otherwise: bb1]; // scope 0 at $DIR/discriminant.rs:6:21: 6:31
|
||||
+ switchInt(const 1isize) -> [1isize: bb2, otherwise: bb1]; // scope 0 at $DIR/discriminant.rs:11:21: 11:31
|
||||
+ // ty::Const
|
||||
+ // + ty: isize
|
||||
+ // + val: Value(Scalar(0x0000000000000001))
|
||||
+ // mir::Constant
|
||||
+ // + span: $DIR/discriminant.rs:6:21: 6:31
|
||||
+ // + span: $DIR/discriminant.rs:11:21: 11:31
|
||||
+ // + literal: Const { ty: isize, val: Value(Scalar(0x0000000000000001)) }
|
||||
}
|
||||
|
||||
bb1: {
|
||||
_2 = const 10i32; // scope 0 at $DIR/discriminant.rs:6:59: 6:61
|
||||
_2 = const 10i32; // scope 0 at $DIR/discriminant.rs:11:59: 11:61
|
||||
// ty::Const
|
||||
// + ty: i32
|
||||
// + val: Value(Scalar(0x0000000a))
|
||||
// mir::Constant
|
||||
// + span: $DIR/discriminant.rs:6:59: 6:61
|
||||
// + span: $DIR/discriminant.rs:11:59: 11:61
|
||||
// + literal: Const { ty: i32, val: Value(Scalar(0x0000000a)) }
|
||||
goto -> bb4; // scope 0 at $DIR/discriminant.rs:6:13: 6:64
|
||||
goto -> bb4; // scope 0 at $DIR/discriminant.rs:11:13: 11:64
|
||||
}
|
||||
|
||||
bb2: {
|
||||
- switchInt(((_3 as Some).0: bool)) -> [false: bb1, otherwise: bb3]; // scope 0 at $DIR/discriminant.rs:6:26: 6:30
|
||||
+ switchInt(const true) -> [false: bb1, otherwise: bb3]; // scope 0 at $DIR/discriminant.rs:6:26: 6:30
|
||||
+ // ty::Const
|
||||
+ // + ty: bool
|
||||
+ // + val: Value(Scalar(0x01))
|
||||
+ // mir::Constant
|
||||
+ // + span: $DIR/discriminant.rs:6:26: 6:30
|
||||
+ // + literal: Const { ty: bool, val: Value(Scalar(0x01)) }
|
||||
switchInt(((_3 as Some).0: bool)) -> [false: bb1, otherwise: bb3]; // scope 0 at $DIR/discriminant.rs:11:26: 11:30
|
||||
}
|
||||
|
||||
bb3: {
|
||||
_2 = const 42i32; // scope 0 at $DIR/discriminant.rs:6:47: 6:49
|
||||
_2 = const 42i32; // scope 0 at $DIR/discriminant.rs:11:47: 11:49
|
||||
// ty::Const
|
||||
// + ty: i32
|
||||
// + val: Value(Scalar(0x0000002a))
|
||||
// mir::Constant
|
||||
// + span: $DIR/discriminant.rs:6:47: 6:49
|
||||
// + span: $DIR/discriminant.rs:11:47: 11:49
|
||||
// + literal: Const { ty: i32, val: Value(Scalar(0x0000002a)) }
|
||||
goto -> bb4; // scope 0 at $DIR/discriminant.rs:6:13: 6:64
|
||||
goto -> bb4; // scope 0 at $DIR/discriminant.rs:11:13: 11:64
|
||||
}
|
||||
|
||||
bb4: {
|
||||
_1 = Add(move _2, const 0i32); // scope 0 at $DIR/discriminant.rs:6:13: 6:68
|
||||
_1 = Add(move _2, const 0i32); // scope 0 at $DIR/discriminant.rs:11:13: 11:68
|
||||
// ty::Const
|
||||
// + ty: i32
|
||||
// + val: Value(Scalar(0x00000000))
|
||||
// mir::Constant
|
||||
// + span: $DIR/discriminant.rs:6:67: 6:68
|
||||
// + span: $DIR/discriminant.rs:11:67: 11:68
|
||||
// + literal: Const { ty: i32, val: Value(Scalar(0x00000000)) }
|
||||
StorageDead(_2); // scope 0 at $DIR/discriminant.rs:6:67: 6:68
|
||||
StorageDead(_3); // scope 0 at $DIR/discriminant.rs:6:68: 6:69
|
||||
_0 = const (); // scope 0 at $DIR/discriminant.rs:5:11: 7:2
|
||||
StorageDead(_2); // scope 0 at $DIR/discriminant.rs:11:67: 11:68
|
||||
StorageDead(_3); // scope 0 at $DIR/discriminant.rs:11:68: 11:69
|
||||
_0 = const (); // scope 0 at $DIR/discriminant.rs:10:11: 12:2
|
||||
// ty::Const
|
||||
// + ty: ()
|
||||
// + val: Value(Scalar(<ZST>))
|
||||
// mir::Constant
|
||||
// + span: $DIR/discriminant.rs:5:11: 7:2
|
||||
// + span: $DIR/discriminant.rs:10:11: 12:2
|
||||
// + literal: Const { ty: (), val: Value(Scalar(<ZST>)) }
|
||||
StorageDead(_1); // scope 0 at $DIR/discriminant.rs:7:1: 7:2
|
||||
return; // scope 0 at $DIR/discriminant.rs:7:2: 7:2
|
||||
StorageDead(_1); // scope 0 at $DIR/discriminant.rs:12:1: 12:2
|
||||
return; // scope 0 at $DIR/discriminant.rs:12:2: 12:2
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user