diff options
Diffstat (limited to 'src/test/mir-opt/dest-prop')
13 files changed, 403 insertions, 0 deletions
diff --git a/src/test/mir-opt/dest-prop/branch.main.DestinationPropagation.diff b/src/test/mir-opt/dest-prop/branch.main.DestinationPropagation.diff new file mode 100644 index 000000000..8929f2cc7 --- /dev/null +++ b/src/test/mir-opt/dest-prop/branch.main.DestinationPropagation.diff @@ -0,0 +1,65 @@ +- // MIR for `main` before DestinationPropagation ++ // MIR for `main` after DestinationPropagation + + fn main() -> () { + let mut _0: (); // return place in scope 0 at $DIR/branch.rs:+0:11: +0:11 + let _1: i32; // in scope 0 at $DIR/branch.rs:+1:9: +1:10 + let mut _3: bool; // in scope 0 at $DIR/branch.rs:+3:16: +3:22 + let _4: i32; // in scope 0 at $DIR/branch.rs:+6:9: +6:14 + scope 1 { + debug x => _1; // in scope 1 at $DIR/branch.rs:+1:9: +1:10 + let _2: i32; // in scope 1 at $DIR/branch.rs:+3:9: +3:10 + scope 2 { + debug y => _2; // in scope 2 at $DIR/branch.rs:+3:9: +3:10 + } + } + + bb0: { + StorageLive(_1); // scope 0 at $DIR/branch.rs:+1:9: +1:10 + _1 = val() -> bb1; // scope 0 at $DIR/branch.rs:+1:13: +1:18 + // mir::Constant + // + span: $DIR/branch.rs:13:13: 13:16 + // + literal: Const { ty: fn() -> i32 {val}, val: Value(<ZST>) } + } + + bb1: { + StorageLive(_2); // scope 1 at $DIR/branch.rs:+3:9: +3:10 + StorageLive(_3); // scope 1 at $DIR/branch.rs:+3:16: +3:22 + _3 = cond() -> bb2; // scope 1 at $DIR/branch.rs:+3:16: +3:22 + // mir::Constant + // + span: $DIR/branch.rs:15:16: 15:20 + // + literal: Const { ty: fn() -> bool {cond}, val: Value(<ZST>) } + } + + bb2: { + switchInt(move _3) -> [false: bb4, otherwise: bb3]; // scope 1 at $DIR/branch.rs:+3:16: +3:22 + } + + bb3: { + nop; // scope 1 at $DIR/branch.rs:+4:9: +4:10 + goto -> bb6; // scope 1 at $DIR/branch.rs:+3:13: +8:6 + } + + bb4: { + StorageLive(_4); // scope 1 at $DIR/branch.rs:+6:9: +6:14 + _4 = val() -> bb5; // scope 1 at $DIR/branch.rs:+6:9: +6:14 + // mir::Constant + // + span: $DIR/branch.rs:18:9: 18:12 + // + literal: Const { ty: fn() -> i32 {val}, val: Value(<ZST>) } + } + + bb5: { + StorageDead(_4); // scope 1 at $DIR/branch.rs:+6:14: +6:15 + nop; // scope 1 at $DIR/branch.rs:+7:9: +7:10 + goto -> bb6; // scope 1 at $DIR/branch.rs:+3:13: +8:6 + } + + bb6: { + StorageDead(_3); // scope 1 at $DIR/branch.rs:+8:5: +8:6 + nop; // scope 0 at $DIR/branch.rs:+0:11: +9:2 + StorageDead(_2); // scope 1 at $DIR/branch.rs:+9:1: +9:2 + StorageDead(_1); // scope 0 at $DIR/branch.rs:+9:1: +9:2 + return; // scope 0 at $DIR/branch.rs:+9:2: +9:2 + } + } + diff --git a/src/test/mir-opt/dest-prop/branch.rs b/src/test/mir-opt/dest-prop/branch.rs new file mode 100644 index 000000000..fffcf82b3 --- /dev/null +++ b/src/test/mir-opt/dest-prop/branch.rs @@ -0,0 +1,21 @@ +//! Tests that assignment in both branches of an `if` are eliminated. +// compile-flags: -Zunsound-mir-opts +fn val() -> i32 { + 1 +} + +fn cond() -> bool { + true +} + +// EMIT_MIR branch.main.DestinationPropagation.diff +fn main() { + let x = val(); + + let y = if cond() { + x + } else { + val(); + x + }; +} diff --git a/src/test/mir-opt/dest-prop/copy_propagation_arg.arg_src.DestinationPropagation.diff b/src/test/mir-opt/dest-prop/copy_propagation_arg.arg_src.DestinationPropagation.diff new file mode 100644 index 000000000..f28bc72df --- /dev/null +++ b/src/test/mir-opt/dest-prop/copy_propagation_arg.arg_src.DestinationPropagation.diff @@ -0,0 +1,26 @@ +- // MIR for `arg_src` before DestinationPropagation ++ // MIR for `arg_src` after DestinationPropagation + + fn arg_src(_1: i32) -> i32 { + debug x => const 123_i32; // in scope 0 at $DIR/copy_propagation_arg.rs:+0:12: +0:17 + let mut _0: i32; // return place in scope 0 at $DIR/copy_propagation_arg.rs:+0:27: +0:30 + let _2: i32; // in scope 0 at $DIR/copy_propagation_arg.rs:+1:9: +1:10 + scope 1 { +- debug y => _2; // in scope 1 at $DIR/copy_propagation_arg.rs:+1:9: +1:10 ++ debug y => _0; // in scope 1 at $DIR/copy_propagation_arg.rs:+1:9: +1:10 + } + + bb0: { +- StorageLive(_2); // scope 0 at $DIR/copy_propagation_arg.rs:+1:9: +1:10 +- _2 = _1; // scope 0 at $DIR/copy_propagation_arg.rs:+1:13: +1:14 ++ nop; // scope 0 at $DIR/copy_propagation_arg.rs:+1:9: +1:10 ++ _0 = _1; // scope 0 at $DIR/copy_propagation_arg.rs:+1:13: +1:14 + nop; // scope 1 at $DIR/copy_propagation_arg.rs:+2:5: +2:12 +- _0 = _2; // scope 1 at $DIR/copy_propagation_arg.rs:+3:5: +3:6 +- StorageDead(_2); // scope 0 at $DIR/copy_propagation_arg.rs:+4:1: +4:2 ++ nop; // scope 1 at $DIR/copy_propagation_arg.rs:+3:5: +3:6 ++ nop; // scope 0 at $DIR/copy_propagation_arg.rs:+4:1: +4:2 + return; // scope 0 at $DIR/copy_propagation_arg.rs:+4:2: +4:2 + } + } + diff --git a/src/test/mir-opt/dest-prop/copy_propagation_arg.bar.DestinationPropagation.diff b/src/test/mir-opt/dest-prop/copy_propagation_arg.bar.DestinationPropagation.diff new file mode 100644 index 000000000..a8a7e9ab6 --- /dev/null +++ b/src/test/mir-opt/dest-prop/copy_propagation_arg.bar.DestinationPropagation.diff @@ -0,0 +1,28 @@ +- // MIR for `bar` before DestinationPropagation ++ // MIR for `bar` after DestinationPropagation + + fn bar(_1: u8) -> () { + debug x => const 5_u8; // in scope 0 at $DIR/copy_propagation_arg.rs:+0:8: +0:13 + let mut _0: (); // return place in scope 0 at $DIR/copy_propagation_arg.rs:+0:19: +0:19 + let _2: u8; // in scope 0 at $DIR/copy_propagation_arg.rs:+1:5: +1:13 + let mut _3: u8; // in scope 0 at $DIR/copy_propagation_arg.rs:+1:11: +1:12 + + bb0: { + StorageLive(_2); // scope 0 at $DIR/copy_propagation_arg.rs:+1:5: +1:13 + StorageLive(_3); // scope 0 at $DIR/copy_propagation_arg.rs:+1:11: +1:12 + _3 = _1; // scope 0 at $DIR/copy_propagation_arg.rs:+1:11: +1:12 + _2 = dummy(move _3) -> bb1; // scope 0 at $DIR/copy_propagation_arg.rs:+1:5: +1:13 + // mir::Constant + // + span: $DIR/copy_propagation_arg.rs:16:5: 16:10 + // + literal: Const { ty: fn(u8) -> u8 {dummy}, val: Value(<ZST>) } + } + + bb1: { + StorageDead(_3); // scope 0 at $DIR/copy_propagation_arg.rs:+1:12: +1:13 + StorageDead(_2); // scope 0 at $DIR/copy_propagation_arg.rs:+1:13: +1:14 + nop; // scope 0 at $DIR/copy_propagation_arg.rs:+2:5: +2:10 + nop; // scope 0 at $DIR/copy_propagation_arg.rs:+0:19: +3:2 + return; // scope 0 at $DIR/copy_propagation_arg.rs:+3:2: +3:2 + } + } + diff --git a/src/test/mir-opt/dest-prop/copy_propagation_arg.baz.DestinationPropagation.diff b/src/test/mir-opt/dest-prop/copy_propagation_arg.baz.DestinationPropagation.diff new file mode 100644 index 000000000..ce9be4c27 --- /dev/null +++ b/src/test/mir-opt/dest-prop/copy_propagation_arg.baz.DestinationPropagation.diff @@ -0,0 +1,18 @@ +- // MIR for `baz` before DestinationPropagation ++ // MIR for `baz` after DestinationPropagation + + fn baz(_1: i32) -> () { + debug x => _1; // in scope 0 at $DIR/copy_propagation_arg.rs:+0:8: +0:13 + let mut _0: (); // return place in scope 0 at $DIR/copy_propagation_arg.rs:+0:20: +0:20 + let mut _2: i32; // in scope 0 at $DIR/copy_propagation_arg.rs:+2:9: +2:10 + + bb0: { + StorageLive(_2); // scope 0 at $DIR/copy_propagation_arg.rs:+2:9: +2:10 + nop; // scope 0 at $DIR/copy_propagation_arg.rs:+2:9: +2:10 + nop; // scope 0 at $DIR/copy_propagation_arg.rs:+2:5: +2:10 + StorageDead(_2); // scope 0 at $DIR/copy_propagation_arg.rs:+2:9: +2:10 + nop; // scope 0 at $DIR/copy_propagation_arg.rs:+0:20: +3:2 + return; // scope 0 at $DIR/copy_propagation_arg.rs:+3:2: +3:2 + } + } + diff --git a/src/test/mir-opt/dest-prop/copy_propagation_arg.foo.DestinationPropagation.diff b/src/test/mir-opt/dest-prop/copy_propagation_arg.foo.DestinationPropagation.diff new file mode 100644 index 000000000..d7a0b950f --- /dev/null +++ b/src/test/mir-opt/dest-prop/copy_propagation_arg.foo.DestinationPropagation.diff @@ -0,0 +1,28 @@ +- // MIR for `foo` before DestinationPropagation ++ // MIR for `foo` after DestinationPropagation + + fn foo(_1: u8) -> () { + debug x => _1; // in scope 0 at $DIR/copy_propagation_arg.rs:+0:8: +0:13 + let mut _0: (); // return place in scope 0 at $DIR/copy_propagation_arg.rs:+0:19: +0:19 + let mut _2: u8; // in scope 0 at $DIR/copy_propagation_arg.rs:+2:9: +2:17 + let mut _3: u8; // in scope 0 at $DIR/copy_propagation_arg.rs:+2:15: +2:16 + + bb0: { + StorageLive(_2); // scope 0 at $DIR/copy_propagation_arg.rs:+2:9: +2:17 + StorageLive(_3); // scope 0 at $DIR/copy_propagation_arg.rs:+2:15: +2:16 + _3 = _1; // scope 0 at $DIR/copy_propagation_arg.rs:+2:15: +2:16 + _2 = dummy(move _3) -> bb1; // scope 0 at $DIR/copy_propagation_arg.rs:+2:9: +2:17 + // mir::Constant + // + span: $DIR/copy_propagation_arg.rs:11:9: 11:14 + // + literal: Const { ty: fn(u8) -> u8 {dummy}, val: Value(<ZST>) } + } + + bb1: { + StorageDead(_3); // scope 0 at $DIR/copy_propagation_arg.rs:+2:16: +2:17 + nop; // scope 0 at $DIR/copy_propagation_arg.rs:+2:5: +2:17 + StorageDead(_2); // scope 0 at $DIR/copy_propagation_arg.rs:+2:16: +2:17 + nop; // scope 0 at $DIR/copy_propagation_arg.rs:+0:19: +3:2 + return; // scope 0 at $DIR/copy_propagation_arg.rs:+3:2: +3:2 + } + } + diff --git a/src/test/mir-opt/dest-prop/copy_propagation_arg.rs b/src/test/mir-opt/dest-prop/copy_propagation_arg.rs new file mode 100644 index 000000000..a5fb0f640 --- /dev/null +++ b/src/test/mir-opt/dest-prop/copy_propagation_arg.rs @@ -0,0 +1,39 @@ +// Check that DestinationPropagation does not propagate an assignment to a function argument +// (doing so can break usages of the original argument value) +// compile-flags: -Zunsound-mir-opts +fn dummy(x: u8) -> u8 { + x +} + +// EMIT_MIR copy_propagation_arg.foo.DestinationPropagation.diff +fn foo(mut x: u8) { + // calling `dummy` to make a use of `x` that copyprop cannot eliminate + x = dummy(x); // this will assign a local to `x` +} + +// EMIT_MIR copy_propagation_arg.bar.DestinationPropagation.diff +fn bar(mut x: u8) { + dummy(x); + x = 5; +} + +// EMIT_MIR copy_propagation_arg.baz.DestinationPropagation.diff +fn baz(mut x: i32) { + // self-assignment to a function argument should be eliminated + x = x; +} + +// EMIT_MIR copy_propagation_arg.arg_src.DestinationPropagation.diff +fn arg_src(mut x: i32) -> i32 { + let y = x; + x = 123; // Don't propagate this assignment to `y` + y +} + +fn main() { + // Make sure the function actually gets instantiated. + foo(0); + bar(0); + baz(0); + arg_src(0); +} diff --git a/src/test/mir-opt/dest-prop/cycle.main.DestinationPropagation.diff b/src/test/mir-opt/dest-prop/cycle.main.DestinationPropagation.diff new file mode 100644 index 000000000..8eeb0d354 --- /dev/null +++ b/src/test/mir-opt/dest-prop/cycle.main.DestinationPropagation.diff @@ -0,0 +1,53 @@ +- // MIR for `main` before DestinationPropagation ++ // MIR for `main` after DestinationPropagation + + fn main() -> () { + let mut _0: (); // return place in scope 0 at $DIR/cycle.rs:+0:11: +0:11 + let mut _1: i32; // in scope 0 at $DIR/cycle.rs:+1:9: +1:14 + let mut _4: i32; // in scope 0 at $DIR/cycle.rs:+4:9: +4:10 + let _5: (); // in scope 0 at $DIR/cycle.rs:+6:5: +6:12 + let mut _6: i32; // in scope 0 at $DIR/cycle.rs:+6:10: +6:11 + scope 1 { + debug x => _1; // in scope 1 at $DIR/cycle.rs:+1:9: +1:14 + let _2: i32; // in scope 1 at $DIR/cycle.rs:+2:9: +2:10 + scope 2 { + debug y => _2; // in scope 2 at $DIR/cycle.rs:+2:9: +2:10 + let _3: i32; // in scope 2 at $DIR/cycle.rs:+3:9: +3:10 + scope 3 { + debug z => _3; // in scope 3 at $DIR/cycle.rs:+3:9: +3:10 + scope 4 (inlined std::mem::drop::<i32>) { // at $DIR/cycle.rs:14:5: 14:12 + debug _x => _6; // in scope 4 at $SRC_DIR/core/src/mem/mod.rs:LL:COL + } + } + } + } + + bb0: { + StorageLive(_1); // scope 0 at $DIR/cycle.rs:+1:9: +1:14 + _1 = val() -> bb1; // scope 0 at $DIR/cycle.rs:+1:17: +1:22 + // mir::Constant + // + span: $DIR/cycle.rs:9:17: 9:20 + // + literal: Const { ty: fn() -> i32 {val}, val: Value(<ZST>) } + } + + bb1: { + StorageLive(_2); // scope 1 at $DIR/cycle.rs:+2:9: +2:10 + nop; // scope 1 at $DIR/cycle.rs:+2:13: +2:14 + StorageLive(_3); // scope 2 at $DIR/cycle.rs:+3:9: +3:10 + nop; // scope 2 at $DIR/cycle.rs:+3:13: +3:14 + StorageLive(_4); // scope 3 at $DIR/cycle.rs:+4:9: +4:10 + nop; // scope 3 at $DIR/cycle.rs:+4:9: +4:10 + nop; // scope 3 at $DIR/cycle.rs:+4:5: +4:10 + StorageDead(_4); // scope 3 at $DIR/cycle.rs:+4:9: +4:10 + StorageLive(_5); // scope 3 at $DIR/cycle.rs:+6:5: +6:12 + StorageLive(_6); // scope 3 at $DIR/cycle.rs:+6:10: +6:11 + nop; // scope 3 at $DIR/cycle.rs:+6:10: +6:11 + StorageDead(_6); // scope 3 at $DIR/cycle.rs:+6:11: +6:12 + StorageDead(_5); // scope 3 at $DIR/cycle.rs:+6:12: +6:13 + StorageDead(_3); // scope 2 at $DIR/cycle.rs:+7:1: +7:2 + StorageDead(_2); // scope 1 at $DIR/cycle.rs:+7:1: +7:2 + StorageDead(_1); // scope 0 at $DIR/cycle.rs:+7:1: +7:2 + return; // scope 0 at $DIR/cycle.rs:+7:2: +7:2 + } + } + diff --git a/src/test/mir-opt/dest-prop/cycle.rs b/src/test/mir-opt/dest-prop/cycle.rs new file mode 100644 index 000000000..c9187d408 --- /dev/null +++ b/src/test/mir-opt/dest-prop/cycle.rs @@ -0,0 +1,15 @@ +//! Tests that cyclic assignments don't hang DestinationPropagation, and result in reasonable code. +// compile-flags: -Zunsound-mir-opts +fn val() -> i32 { + 1 +} + +// EMIT_MIR cycle.main.DestinationPropagation.diff +fn main() { + let mut x = val(); + let y = x; + let z = y; + x = z; + + drop(x); +} diff --git a/src/test/mir-opt/dest-prop/simple.nrvo.DestinationPropagation.diff b/src/test/mir-opt/dest-prop/simple.nrvo.DestinationPropagation.diff new file mode 100644 index 000000000..a20a172af --- /dev/null +++ b/src/test/mir-opt/dest-prop/simple.nrvo.DestinationPropagation.diff @@ -0,0 +1,39 @@ +- // MIR for `nrvo` before DestinationPropagation ++ // MIR for `nrvo` after DestinationPropagation + + fn nrvo(_1: for<'r> fn(&'r mut [u8; 1024])) -> [u8; 1024] { + debug init => _1; // in scope 0 at $DIR/simple.rs:+0:9: +0:13 + let mut _0: [u8; 1024]; // return place in scope 0 at $DIR/simple.rs:+0:39: +0:49 + let mut _2: [u8; 1024]; // in scope 0 at $DIR/simple.rs:+1:9: +1:16 + let _3: (); // in scope 0 at $DIR/simple.rs:+2:5: +2:19 + let mut _4: for<'r> fn(&'r mut [u8; 1024]); // in scope 0 at $DIR/simple.rs:+2:5: +2:9 + let mut _5: &mut [u8; 1024]; // in scope 0 at $DIR/simple.rs:+2:10: +2:18 + let mut _6: &mut [u8; 1024]; // in scope 0 at $DIR/simple.rs:+2:10: +2:18 + scope 1 { + debug buf => _2; // in scope 1 at $DIR/simple.rs:+1:9: +1:16 + } + + bb0: { + StorageLive(_2); // scope 0 at $DIR/simple.rs:+1:9: +1:16 + _2 = [const 0_u8; 1024]; // scope 0 at $DIR/simple.rs:+1:19: +1:28 + StorageLive(_3); // scope 1 at $DIR/simple.rs:+2:5: +2:19 + StorageLive(_4); // scope 1 at $DIR/simple.rs:+2:5: +2:9 + _4 = _1; // scope 1 at $DIR/simple.rs:+2:5: +2:9 + StorageLive(_5); // scope 1 at $DIR/simple.rs:+2:10: +2:18 + StorageLive(_6); // scope 1 at $DIR/simple.rs:+2:10: +2:18 + _6 = &mut _2; // scope 1 at $DIR/simple.rs:+2:10: +2:18 + _5 = &mut (*_6); // scope 1 at $DIR/simple.rs:+2:10: +2:18 + _3 = move _4(move _5) -> bb1; // scope 1 at $DIR/simple.rs:+2:5: +2:19 + } + + bb1: { + StorageDead(_5); // scope 1 at $DIR/simple.rs:+2:18: +2:19 + StorageDead(_4); // scope 1 at $DIR/simple.rs:+2:18: +2:19 + StorageDead(_6); // scope 1 at $DIR/simple.rs:+2:19: +2:20 + StorageDead(_3); // scope 1 at $DIR/simple.rs:+2:19: +2:20 + _0 = _2; // scope 1 at $DIR/simple.rs:+3:5: +3:8 + StorageDead(_2); // scope 0 at $DIR/simple.rs:+4:1: +4:2 + return; // scope 0 at $DIR/simple.rs:+4:2: +4:2 + } + } + diff --git a/src/test/mir-opt/dest-prop/simple.rs b/src/test/mir-opt/dest-prop/simple.rs new file mode 100644 index 000000000..3627d479a --- /dev/null +++ b/src/test/mir-opt/dest-prop/simple.rs @@ -0,0 +1,14 @@ +//! Copy of `nrvo-simple.rs`, to ensure that full dest-prop handles it too. +// compile-flags: -Zunsound-mir-opts +// EMIT_MIR simple.nrvo.DestinationPropagation.diff +fn nrvo(init: fn(&mut [u8; 1024])) -> [u8; 1024] { + let mut buf = [0; 1024]; + init(&mut buf); + buf +} + +fn main() { + let _ = nrvo(|buf| { + buf[4] = 4; + }); +} diff --git a/src/test/mir-opt/dest-prop/union.main.DestinationPropagation.diff b/src/test/mir-opt/dest-prop/union.main.DestinationPropagation.diff new file mode 100644 index 000000000..accdb0085 --- /dev/null +++ b/src/test/mir-opt/dest-prop/union.main.DestinationPropagation.diff @@ -0,0 +1,41 @@ +- // MIR for `main` before DestinationPropagation ++ // MIR for `main` after DestinationPropagation + + fn main() -> () { + let mut _0: (); // return place in scope 0 at $DIR/union.rs:+0:11: +0:11 + let _1: main::Un; // in scope 0 at $DIR/union.rs:+5:9: +5:11 + let mut _2: u32; // in scope 0 at $DIR/union.rs:+5:23: +5:28 + let _3: (); // in scope 0 at $DIR/union.rs:+7:5: +7:27 + let mut _4: u32; // in scope 0 at $DIR/union.rs:+7:10: +7:26 + scope 1 { + debug un => _1; // in scope 1 at $DIR/union.rs:+5:9: +5:11 + scope 2 { + } + scope 3 (inlined std::mem::drop::<u32>) { // at $DIR/union.rs:15:5: 15:27 + debug _x => _4; // in scope 3 at $SRC_DIR/core/src/mem/mod.rs:LL:COL + } + } + + bb0: { + StorageLive(_1); // scope 0 at $DIR/union.rs:+5:9: +5:11 + StorageLive(_2); // scope 0 at $DIR/union.rs:+5:23: +5:28 + _2 = val() -> bb1; // scope 0 at $DIR/union.rs:+5:23: +5:28 + // mir::Constant + // + span: $DIR/union.rs:13:23: 13:26 + // + literal: Const { ty: fn() -> u32 {val}, val: Value(<ZST>) } + } + + bb1: { + nop; // scope 0 at $DIR/union.rs:+5:14: +5:30 + nop; // scope 0 at $DIR/union.rs:+5:14: +5:30 + StorageDead(_2); // scope 0 at $DIR/union.rs:+5:29: +5:30 + StorageLive(_3); // scope 1 at $DIR/union.rs:+7:5: +7:27 + StorageLive(_4); // scope 1 at $DIR/union.rs:+7:10: +7:26 + nop; // scope 2 at $DIR/union.rs:+7:19: +7:24 + StorageDead(_4); // scope 1 at $DIR/union.rs:+7:26: +7:27 + StorageDead(_3); // scope 1 at $DIR/union.rs:+7:27: +7:28 + StorageDead(_1); // scope 0 at $DIR/union.rs:+8:1: +8:2 + return; // scope 0 at $DIR/union.rs:+8:2: +8:2 + } + } + diff --git a/src/test/mir-opt/dest-prop/union.rs b/src/test/mir-opt/dest-prop/union.rs new file mode 100644 index 000000000..68c834dfb --- /dev/null +++ b/src/test/mir-opt/dest-prop/union.rs @@ -0,0 +1,16 @@ +//! Tests that we can propogate into places that are projections into unions +// compile-flags: -Zunsound-mir-opts +fn val() -> u32 { + 1 +} + +// EMIT_MIR union.main.DestinationPropagation.diff +fn main() { + union Un { + us: u32, + } + + let un = Un { us: val() }; + + drop(unsafe { un.us }); +} |