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Auto merge of rust-lang#74746 - wesleywiser:stable_backport_73669, r=…
…Mark-Simulacrum Stable backport of rust-lang#73613 This is the backport of rust-lang#73613 to stable. r? @ghost cc @Mark-Simulacrum In addition the tests added in the original PR passing, I've also confirmed that the test case in rust-lang#74739 works correctly.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,22 @@ | ||
| #![feature(raw_ref_op)] | ||
|
|
||
| // EMIT_MIR rustc.foo.ConstProp.diff | ||
| fn foo() { | ||
| let mut u = (1,); | ||
| *&mut u.0 = 5; | ||
| let y = { u.0 } == 5; | ||
| } | ||
|
|
||
| // EMIT_MIR rustc.bar.ConstProp.diff | ||
| fn bar() { | ||
| let mut v = (1,); | ||
| unsafe { | ||
| *&raw mut v.0 = 5; | ||
| } | ||
| let y = { v.0 } == 5; | ||
| } | ||
|
|
||
| fn main() { | ||
| foo(); | ||
| bar(); | ||
| } |
75 changes: 75 additions & 0 deletions
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src/test/mir-opt/const_prop_miscompile/rustc.bar.ConstProp.diff
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| - // MIR for `bar` before ConstProp | ||
| + // MIR for `bar` after ConstProp | ||
|
|
||
| fn bar() -> () { | ||
| let mut _0: (); // return place in scope 0 at $DIR/const_prop_miscompile.rs:11:10: 11:10 | ||
| let mut _1: (i32,); // in scope 0 at $DIR/const_prop_miscompile.rs:12:9: 12:14 | ||
| let _2: (); // in scope 0 at $DIR/const_prop_miscompile.rs:13:5: 15:6 | ||
| let mut _3: *mut i32; // in scope 0 at $DIR/const_prop_miscompile.rs:14:10: 14:22 | ||
| let mut _5: i32; // in scope 0 at $DIR/const_prop_miscompile.rs:16:13: 16:20 | ||
| scope 1 { | ||
| debug v => _1; // in scope 1 at $DIR/const_prop_miscompile.rs:12:9: 12:14 | ||
| let _4: bool; // in scope 1 at $DIR/const_prop_miscompile.rs:16:9: 16:10 | ||
| scope 2 { | ||
| } | ||
| scope 3 { | ||
| debug y => _4; // in scope 3 at $DIR/const_prop_miscompile.rs:16:9: 16:10 | ||
| } | ||
| } | ||
|
|
||
| bb0: { | ||
| StorageLive(_1); // scope 0 at $DIR/const_prop_miscompile.rs:12:9: 12:14 | ||
| - _1 = (const 1i32,); // scope 0 at $DIR/const_prop_miscompile.rs:12:17: 12:21 | ||
| + _1 = const (1i32,); // scope 0 at $DIR/const_prop_miscompile.rs:12:17: 12:21 | ||
| // ty::Const | ||
| - // + ty: i32 | ||
| + // + ty: (i32,) | ||
| // + val: Value(Scalar(0x00000001)) | ||
| // mir::Constant | ||
| - // + span: $DIR/const_prop_miscompile.rs:12:18: 12:19 | ||
| - // + literal: Const { ty: i32, val: Value(Scalar(0x00000001)) } | ||
| + // + span: $DIR/const_prop_miscompile.rs:12:17: 12:21 | ||
| + // + literal: Const { ty: (i32,), val: Value(Scalar(0x00000001)) } | ||
| StorageLive(_2); // scope 1 at $DIR/const_prop_miscompile.rs:13:5: 15:6 | ||
| StorageLive(_3); // scope 2 at $DIR/const_prop_miscompile.rs:14:10: 14:22 | ||
| _3 = &raw mut (_1.0: i32); // scope 2 at $DIR/const_prop_miscompile.rs:14:10: 14:22 | ||
| (*_3) = const 5i32; // scope 2 at $DIR/const_prop_miscompile.rs:14:9: 14:26 | ||
| // ty::Const | ||
| // + ty: i32 | ||
| // + val: Value(Scalar(0x00000005)) | ||
| // mir::Constant | ||
| // + span: $DIR/const_prop_miscompile.rs:14:25: 14:26 | ||
| // + literal: Const { ty: i32, val: Value(Scalar(0x00000005)) } | ||
| StorageDead(_3); // scope 2 at $DIR/const_prop_miscompile.rs:14:26: 14:27 | ||
| _2 = const (); // scope 2 at $DIR/const_prop_miscompile.rs:13:5: 15:6 | ||
| // ty::Const | ||
| // + ty: () | ||
| // + val: Value(Scalar(<ZST>)) | ||
| // mir::Constant | ||
| // + span: $DIR/const_prop_miscompile.rs:13:5: 15:6 | ||
| // + literal: Const { ty: (), val: Value(Scalar(<ZST>)) } | ||
| StorageDead(_2); // scope 1 at $DIR/const_prop_miscompile.rs:15:5: 15:6 | ||
| StorageLive(_4); // scope 1 at $DIR/const_prop_miscompile.rs:16:9: 16:10 | ||
| StorageLive(_5); // scope 1 at $DIR/const_prop_miscompile.rs:16:13: 16:20 | ||
| _5 = (_1.0: i32); // scope 1 at $DIR/const_prop_miscompile.rs:16:15: 16:18 | ||
| _4 = Eq(move _5, const 5i32); // scope 1 at $DIR/const_prop_miscompile.rs:16:13: 16:25 | ||
| // ty::Const | ||
| // + ty: i32 | ||
| // + val: Value(Scalar(0x00000005)) | ||
| // mir::Constant | ||
| // + span: $DIR/const_prop_miscompile.rs:16:24: 16:25 | ||
| // + literal: Const { ty: i32, val: Value(Scalar(0x00000005)) } | ||
| StorageDead(_5); // scope 1 at $DIR/const_prop_miscompile.rs:16:24: 16:25 | ||
| _0 = const (); // scope 0 at $DIR/const_prop_miscompile.rs:11:10: 17:2 | ||
| // ty::Const | ||
| // + ty: () | ||
| // + val: Value(Scalar(<ZST>)) | ||
| // mir::Constant | ||
| // + span: $DIR/const_prop_miscompile.rs:11:10: 17:2 | ||
| // + literal: Const { ty: (), val: Value(Scalar(<ZST>)) } | ||
| StorageDead(_4); // scope 1 at $DIR/const_prop_miscompile.rs:17:1: 17:2 | ||
| StorageDead(_1); // scope 0 at $DIR/const_prop_miscompile.rs:17:1: 17:2 | ||
| return; // scope 0 at $DIR/const_prop_miscompile.rs:17:2: 17:2 | ||
| } | ||
| } | ||
|
|
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