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Add test.
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‎tests/mir-opt/reference_prop.mut_raw_then_mut_shr.ReferencePropagation.diff

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- // MIR for `mut_raw_then_mut_shr` before ReferencePropagation
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+ // MIR for `mut_raw_then_mut_shr` after ReferencePropagation
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fn mut_raw_then_mut_shr() -> (i32, i32) {
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let mut _0: (i32, i32); // return place in scope 0 at $DIR/reference_prop.rs:+0:30: +0:40
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let mut _1: i32; // in scope 0 at $DIR/reference_prop.rs:+1:9: +1:14
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let mut _4: *mut i32; // in scope 0 at $DIR/reference_prop.rs:+3:16: +3:36
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let mut _5: &mut i32; // in scope 0 at $DIR/reference_prop.rs:+3:16: +3:26
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let _8: (); // in scope 0 at $DIR/reference_prop.rs:+7:5: +7:26
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let mut _9: i32; // in scope 0 at $DIR/reference_prop.rs:+8:6: +8:7
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let mut _10: i32; // in scope 0 at $DIR/reference_prop.rs:+8:9: +8:10
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scope 1 {
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debug x => _1; // in scope 1 at $DIR/reference_prop.rs:+1:9: +1:14
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let _2: &mut i32; // in scope 1 at $DIR/reference_prop.rs:+2:9: +2:13
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scope 2 {
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debug xref => _2; // in scope 2 at $DIR/reference_prop.rs:+2:9: +2:13
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let _3: *mut i32; // in scope 2 at $DIR/reference_prop.rs:+3:9: +3:13
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scope 3 {
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debug xraw => _3; // in scope 3 at $DIR/reference_prop.rs:+3:9: +3:13
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let _6: &i32; // in scope 3 at $DIR/reference_prop.rs:+4:9: +4:13
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scope 4 {
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debug xshr => _6; // in scope 4 at $DIR/reference_prop.rs:+4:9: +4:13
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let _7: i32; // in scope 4 at $DIR/reference_prop.rs:+6:9: +6:10
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scope 5 {
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debug a => _7; // in scope 5 at $DIR/reference_prop.rs:+6:9: +6:10
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scope 6 {
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}
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}
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}
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}
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}
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}
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bb0: {
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StorageLive(_1); // scope 0 at $DIR/reference_prop.rs:+1:9: +1:14
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_1 = const 2_i32; // scope 0 at $DIR/reference_prop.rs:+1:17: +1:18
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- StorageLive(_2); // scope 1 at $DIR/reference_prop.rs:+2:9: +2:13
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_2 = &mut _1; // scope 1 at $DIR/reference_prop.rs:+2:16: +2:22
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StorageLive(_3); // scope 2 at $DIR/reference_prop.rs:+3:9: +3:13
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StorageLive(_4); // scope 2 at $DIR/reference_prop.rs:+3:16: +3:36
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- StorageLive(_5); // scope 2 at $DIR/reference_prop.rs:+3:16: +3:26
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- _5 = &mut (*_2); // scope 2 at $DIR/reference_prop.rs:+3:16: +3:26
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- _4 = &raw mut (*_5); // scope 2 at $DIR/reference_prop.rs:+3:16: +3:26
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+ _5 = &mut _1; // scope 2 at $DIR/reference_prop.rs:+3:16: +3:26
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+ _4 = &raw mut (*_2); // scope 2 at $DIR/reference_prop.rs:+3:16: +3:26
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_3 = _4; // scope 2 at $DIR/reference_prop.rs:+3:16: +3:36
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- StorageDead(_5); // scope 2 at $DIR/reference_prop.rs:+3:36: +3:37
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StorageDead(_4); // scope 2 at $DIR/reference_prop.rs:+3:36: +3:37
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StorageLive(_6); // scope 3 at $DIR/reference_prop.rs:+4:9: +4:13
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- _6 = &(*_2); // scope 3 at $DIR/reference_prop.rs:+4:16: +4:22
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+ _6 = &_1; // scope 3 at $DIR/reference_prop.rs:+4:16: +4:22
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StorageLive(_7); // scope 4 at $DIR/reference_prop.rs:+6:9: +6:10
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- _7 = (*_6); // scope 4 at $DIR/reference_prop.rs:+6:13: +6:18
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- StorageLive(_8); // scope 5 at $DIR/reference_prop.rs:+7:5: +7:26
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- (*_3) = const 4_i32; // scope 6 at $DIR/reference_prop.rs:+7:14: +7:23
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- _8 = const (); // scope 6 at $DIR/reference_prop.rs:+7:5: +7:26
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- StorageDead(_8); // scope 5 at $DIR/reference_prop.rs:+7:25: +7:26
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+ _7 = (*_2); // scope 4 at $DIR/reference_prop.rs:+6:13: +6:18
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+ (*_5) = const 4_i32; // scope 6 at $DIR/reference_prop.rs:+7:14: +7:23
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StorageLive(_9); // scope 5 at $DIR/reference_prop.rs:+8:6: +8:7
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_9 = _7; // scope 5 at $DIR/reference_prop.rs:+8:6: +8:7
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StorageLive(_10); // scope 5 at $DIR/reference_prop.rs:+8:9: +8:10
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_10 = _1; // scope 5 at $DIR/reference_prop.rs:+8:9: +8:10
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_0 = (move _9, move _10); // scope 5 at $DIR/reference_prop.rs:+8:5: +8:11
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StorageDead(_10); // scope 5 at $DIR/reference_prop.rs:+8:10: +8:11
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StorageDead(_9); // scope 5 at $DIR/reference_prop.rs:+8:10: +8:11
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StorageDead(_7); // scope 4 at $DIR/reference_prop.rs:+9:1: +9:2
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StorageDead(_6); // scope 3 at $DIR/reference_prop.rs:+9:1: +9:2
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StorageDead(_3); // scope 2 at $DIR/reference_prop.rs:+9:1: +9:2
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- StorageDead(_2); // scope 1 at $DIR/reference_prop.rs:+9:1: +9:2
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StorageDead(_1); // scope 0 at $DIR/reference_prop.rs:+9:1: +9:2
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return; // scope 0 at $DIR/reference_prop.rs:+9:2: +9:2
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}
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}
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‎tests/mir-opt/reference_prop.rs

Lines changed: 27 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -433,6 +433,29 @@ fn maybe_dead(m: bool) {
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)
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}
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fn mut_raw_then_mut_shr() -> (i32, i32) {
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let mut x = 2;
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let xref = &mut x;
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let xraw = &mut *xref as *mut _;
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let xshr = &*xref;
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// Verify that we completely replace with `x` in both cases.
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let a = *xshr;
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unsafe { *xraw = 4; }
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(a, x)
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}
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fn unique_with_copies() {
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let y = {
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let mut a = 0;
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let x = &raw mut a;
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// `*y` is not replacable below, so we must not replace `*x`.
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unsafe { opaque(*x) };
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x
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};
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// But rewriting as `*x` is ok.
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unsafe { opaque(*y) };
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}
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fn main() {
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let mut x = 5_usize;
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let mut y = 7_usize;
@@ -444,6 +467,8 @@ fn main() {
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multiple_storage();
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dominate_storage();
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maybe_dead(true);
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mut_raw_then_mut_shr();
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unique_with_copies();
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}
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// EMIT_MIR reference_prop.reference_propagation.ReferencePropagation.diff
@@ -454,3 +479,5 @@ fn main() {
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// EMIT_MIR reference_prop.multiple_storage.ReferencePropagation.diff
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// EMIT_MIR reference_prop.dominate_storage.ReferencePropagation.diff
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// EMIT_MIR reference_prop.maybe_dead.ReferencePropagation.diff
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// EMIT_MIR reference_prop.mut_raw_then_mut_shr.ReferencePropagation.diff
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// EMIT_MIR reference_prop.unique_with_copies.ReferencePropagation.diff

‎tests/mir-opt/reference_prop.unique_with_copies.ReferencePropagation.diff

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- // MIR for `unique_with_copies` before ReferencePropagation
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+ // MIR for `unique_with_copies` after ReferencePropagation
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fn unique_with_copies() -> () {
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let mut _0: (); // return place in scope 0 at $DIR/reference_prop.rs:+0:25: +0:25
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let _1: *mut i32; // in scope 0 at $DIR/reference_prop.rs:+1:9: +1:10
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let mut _2: i32; // in scope 0 at $DIR/reference_prop.rs:+2:13: +2:18
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let _4: (); // in scope 0 at $DIR/reference_prop.rs:+5:18: +5:28
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let mut _5: i32; // in scope 0 at $DIR/reference_prop.rs:+5:25: +5:27
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let _6: (); // in scope 0 at $DIR/reference_prop.rs:+9:14: +9:24
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let mut _7: i32; // in scope 0 at $DIR/reference_prop.rs:+9:21: +9:23
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scope 1 {
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debug y => _1; // in scope 1 at $DIR/reference_prop.rs:+1:9: +1:10
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scope 5 {
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}
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}
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scope 2 {
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debug a => _2; // in scope 2 at $DIR/reference_prop.rs:+2:13: +2:18
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let _3: *mut i32; // in scope 2 at $DIR/reference_prop.rs:+3:13: +3:14
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scope 3 {
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debug x => _3; // in scope 3 at $DIR/reference_prop.rs:+3:13: +3:14
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scope 4 {
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}
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}
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}
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bb0: {
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StorageLive(_1); // scope 0 at $DIR/reference_prop.rs:+1:9: +1:10
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StorageLive(_2); // scope 0 at $DIR/reference_prop.rs:+2:13: +2:18
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_2 = const 0_i32; // scope 0 at $DIR/reference_prop.rs:+2:21: +2:22
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StorageLive(_3); // scope 2 at $DIR/reference_prop.rs:+3:13: +3:14
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_3 = &raw mut _2; // scope 2 at $DIR/reference_prop.rs:+3:17: +3:27
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StorageLive(_4); // scope 3 at $DIR/reference_prop.rs:+5:9: +5:30
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StorageLive(_5); // scope 4 at $DIR/reference_prop.rs:+5:25: +5:27
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- _5 = (*_3); // scope 4 at $DIR/reference_prop.rs:+5:25: +5:27
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+ _5 = _2; // scope 4 at $DIR/reference_prop.rs:+5:25: +5:27
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_4 = opaque::<i32>(move _5) -> bb1; // scope 4 at $DIR/reference_prop.rs:+5:18: +5:28
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// mir::Constant
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// + span: $DIR/reference_prop.rs:452:18: 452:24
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// + literal: Const { ty: fn(i32) {opaque::<i32>}, val: Value(<ZST>) }
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}
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bb1: {
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StorageDead(_5); // scope 4 at $DIR/reference_prop.rs:+5:27: +5:28
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StorageDead(_4); // scope 3 at $DIR/reference_prop.rs:+5:30: +5:31
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_1 = _3; // scope 3 at $DIR/reference_prop.rs:+6:9: +6:10
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StorageDead(_3); // scope 2 at $DIR/reference_prop.rs:+7:5: +7:6
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StorageDead(_2); // scope 0 at $DIR/reference_prop.rs:+7:5: +7:6
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StorageLive(_6); // scope 1 at $DIR/reference_prop.rs:+9:5: +9:26
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StorageLive(_7); // scope 5 at $DIR/reference_prop.rs:+9:21: +9:23
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_7 = (*_1); // scope 5 at $DIR/reference_prop.rs:+9:21: +9:23
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_6 = opaque::<i32>(move _7) -> bb2; // scope 5 at $DIR/reference_prop.rs:+9:14: +9:24
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// mir::Constant
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// + span: $DIR/reference_prop.rs:456:14: 456:20
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// + literal: Const { ty: fn(i32) {opaque::<i32>}, val: Value(<ZST>) }
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}
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bb2: {
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StorageDead(_7); // scope 5 at $DIR/reference_prop.rs:+9:23: +9:24
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StorageDead(_6); // scope 1 at $DIR/reference_prop.rs:+9:26: +9:27
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_0 = const (); // scope 0 at $DIR/reference_prop.rs:+0:25: +10:2
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StorageDead(_1); // scope 0 at $DIR/reference_prop.rs:+10:1: +10:2
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return; // scope 0 at $DIR/reference_prop.rs:+10:2: +10:2
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}
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}
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