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[mir-opt] Introduce a new flag to enable experimental/unsound mir opts #76899

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Merged
merged 2 commits into from
Sep 28, 2020
Merged

[mir-opt] Introduce a new flag to enable experimental/unsound mir opts #76899

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b9d0ea9
[mir-opt] Introduce a new flag to enable experimental/unsound mir opts
wesleywiser Sep 19, 2020
c653af8
Remove unnecessary -Zunsound-mir-opts uses in tests
wesleywiser Sep 19, 2020
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[mir-opt] Introduce a new flag to enable experimental/unsound mir opts
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@wesleywiser
wesleywiser committed Sep 27, 2020
commit b9d0ea95c8d87310262f6f6cb88c16f6d3d323cc
4 changes: 3 additions & 1 deletion compiler/rustc_mir/src/transform/copy_prop.rs
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Expand Up @@ -31,9 +31,11 @@ pub struct CopyPropagation;

impl<'tcx> MirPass<'tcx> for CopyPropagation {
fn run_pass(&self, tcx: TyCtxt<'tcx>, _source: MirSource<'tcx>, body: &mut Body<'tcx>) {
let opts = &tcx.sess.opts.debugging_opts;
// We only run when the MIR optimization level is > 1.
// This avoids a slow pass, and messing up debug info.
if tcx.sess.opts.debugging_opts.mir_opt_level <= 1 {
// FIXME(76740): This optimization is buggy and can cause unsoundness.
if opts.mir_opt_level <= 1 || !opts.unsound_mir_opts {
return;
}

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2 changes: 2 additions & 0 deletions compiler/rustc_session/src/options.rs
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Expand Up @@ -1115,6 +1115,8 @@ options! {DebuggingOptions, DebuggingSetter, basic_debugging_options,
`hir,typed` (HIR with types for each node),
`hir-tree` (dump the raw HIR),
`mir` (the MIR), or `mir-cfg` (graphviz formatted MIR)"),
unsound_mir_opts: bool = (false, parse_bool, [TRACKED],
"enable unsound and buggy MIR optimizations (default: no)"),
unstable_options: bool = (false, parse_bool, [UNTRACKED],
"adds unstable command line options to rustc interface (default: no)"),
use_ctors_section: Option<bool> = (None, parse_opt_bool, [TRACKED],
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1 change: 1 addition & 0 deletions src/test/mir-opt/copy_propagation.rs
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@@ -1,3 +1,4 @@
// compile-flags: -Zunsound-mir-opts
// EMIT_MIR copy_propagation.test.CopyPropagation.diff

fn test(x: u32) -> u32 {
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18 changes: 9 additions & 9 deletions src/test/mir-opt/copy_propagation.test.CopyPropagation.diff
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Expand Up @@ -2,19 +2,19 @@
+ // MIR for `test` after CopyPropagation

fn test(_1: u32) -> u32 {
debug x => _1; // in scope 0 at $DIR/copy_propagation.rs:3:9: 3:10
let mut _0: u32; // return place in scope 0 at $DIR/copy_propagation.rs:3:20: 3:23
let _2: u32; // in scope 0 at $DIR/copy_propagation.rs:4:9: 4:10
debug x => _1; // in scope 0 at $DIR/copy_propagation.rs:4:9: 4:10
let mut _0: u32; // return place in scope 0 at $DIR/copy_propagation.rs:4:20: 4:23
let _2: u32; // in scope 0 at $DIR/copy_propagation.rs:5:9: 5:10
scope 1 {
debug y => _0; // in scope 1 at $DIR/copy_propagation.rs:4:9: 4:10
debug y => _0; // in scope 1 at $DIR/copy_propagation.rs:5:9: 5:10
}

bb0: {
nop; // scope 0 at $DIR/copy_propagation.rs:4:9: 4:10
_0 = _1; // scope 0 at $DIR/copy_propagation.rs:4:13: 4:14
nop; // scope 1 at $DIR/copy_propagation.rs:5:5: 5:6
nop; // scope 0 at $DIR/copy_propagation.rs:6:1: 6:2
return; // scope 0 at $DIR/copy_propagation.rs:6:2: 6:2
nop; // scope 0 at $DIR/copy_propagation.rs:5:9: 5:10
_0 = _1; // scope 0 at $DIR/copy_propagation.rs:5:13: 5:14
nop; // scope 1 at $DIR/copy_propagation.rs:6:5: 6:6
nop; // scope 0 at $DIR/copy_propagation.rs:7:1: 7:2
return; // scope 0 at $DIR/copy_propagation.rs:7:2: 7:2
}
}

2 changes: 1 addition & 1 deletion src/test/mir-opt/early_otherwise_branch_68867.rs
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@@ -1,5 +1,5 @@
// ignore-tidy-linelength
// compile-flags: -Z mir-opt-level=3
// compile-flags: -Z mir-opt-level=3 -Zunsound-mir-opts

// example from #68867
type CSSFloat = f32;
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2 changes: 1 addition & 1 deletion src/test/mir-opt/inline/inline-any-operand.rs
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@@ -1,4 +1,4 @@
// compile-flags: -Z span_free_formats
// compile-flags: -Z span_free_formats -Zunsound-mir-opts

// Tests that MIR inliner works for any operand

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2 changes: 1 addition & 1 deletion src/test/mir-opt/inline/inline-closure-borrows-arg.rs
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@@ -1,4 +1,4 @@
// compile-flags: -Z span_free_formats
// compile-flags: -Z span_free_formats -Zunsound-mir-opts

// Tests that MIR inliner can handle closure arguments,
// even when (#45894)
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2 changes: 1 addition & 1 deletion src/test/mir-opt/inline/inline-trait-method_2.rs
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@@ -1,4 +1,4 @@
// compile-flags: -Z span_free_formats -Z mir-opt-level=3
// compile-flags: -Z span_free_formats -Z mir-opt-level=3 -Zunsound-mir-opts

// EMIT_MIR inline_trait_method_2.test2.Inline.after.mir
fn test2(x: &dyn X) -> bool {
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207 changes: 111 additions & 96 deletions src/test/mir-opt/issue_73223.main.PreCodegen.32bit.diff
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207 changes: 111 additions & 96 deletions src/test/mir-opt/issue_73223.main.PreCodegen.64bit.diff
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2 changes: 1 addition & 1 deletion src/test/mir-opt/nrvo-simple.rs
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@@ -1,4 +1,4 @@
// compile-flags: -Zmir-opt-level=1
// compile-flags: -Zmir-opt-level=1 -Zunsound-mir-opts

// EMIT_MIR nrvo_simple.nrvo.RenameReturnPlace.diff
fn nrvo(init: fn(&mut [u8; 1024])) -> [u8; 1024] {
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2 changes: 2 additions & 0 deletions src/test/mir-opt/simplify-locals-removes-unused-discriminant-reads.rs
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@@ -1,3 +1,5 @@
// compile-flags: -Zunsound-mir-opts

fn map(x: Option<Box<()>>) -> Option<Box<()>> {
match x {
None => None,
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30 changes: 15 additions & 15 deletions ...t/mir-opt/simplify_locals_removes_unused_discriminant_reads.map.SimplifyLocals.32bit.diff
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Expand Up @@ -2,25 +2,25 @@
+ // MIR for `map` after SimplifyLocals

fn map(_1: Option<Box<()>>) -> Option<Box<()>> {
debug x => _1; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:1:8: 1:9
let mut _0: std::option::Option<std::boxed::Box<()>>; // return place in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:1:31: 1:46
- let mut _2: isize; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:3:9: 3:13
- let _3: std::boxed::Box<()>; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:4:14: 4:15
- let mut _4: std::boxed::Box<()>; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:4:25: 4:26
- let mut _5: bool; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:6:1: 6:2
- let mut _6: isize; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:6:1: 6:2
- let mut _7: isize; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:6:1: 6:2
debug x => _1; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:3:8: 3:9
let mut _0: std::option::Option<std::boxed::Box<()>>; // return place in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:3:31: 3:46
- let mut _2: isize; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:5:9: 5:13
- let _3: std::boxed::Box<()>; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:6:14: 6:15
- let mut _4: std::boxed::Box<()>; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:6:25: 6:26
- let mut _5: bool; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:8:1: 8:2
- let mut _6: isize; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:8:1: 8:2
- let mut _7: isize; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:8:1: 8:2
scope 1 {
debug x => ((_0 as Some).0: std::boxed::Box<()>); // in scope 1 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:4:14: 4:15
debug x => ((_0 as Some).0: std::boxed::Box<()>); // in scope 1 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:6:14: 6:15
}

bb0: {
- _5 = const false; // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:3:9: 3:13
- _5 = const true; // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:3:9: 3:13
- _2 = discriminant(_1); // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:3:9: 3:13
_0 = move _1; // scope 1 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:4:20: 4:27
- _6 = discriminant(_1); // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:6:1: 6:2
return; // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:6:2: 6:2
- _5 = const false; // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:5:9: 5:13
- _5 = const true; // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:5:9: 5:13
- _2 = discriminant(_1); // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:5:9: 5:13
_0 = move _1; // scope 1 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:6:20: 6:27
- _6 = discriminant(_1); // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:8:1: 8:2
return; // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:8:2: 8:2
}
}

30 changes: 15 additions & 15 deletions ...t/mir-opt/simplify_locals_removes_unused_discriminant_reads.map.SimplifyLocals.64bit.diff
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Expand Up @@ -2,25 +2,25 @@
+ // MIR for `map` after SimplifyLocals

fn map(_1: Option<Box<()>>) -> Option<Box<()>> {
debug x => _1; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:1:8: 1:9
let mut _0: std::option::Option<std::boxed::Box<()>>; // return place in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:1:31: 1:46
- let mut _2: isize; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:3:9: 3:13
- let _3: std::boxed::Box<()>; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:4:14: 4:15
- let mut _4: std::boxed::Box<()>; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:4:25: 4:26
- let mut _5: bool; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:6:1: 6:2
- let mut _6: isize; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:6:1: 6:2
- let mut _7: isize; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:6:1: 6:2
debug x => _1; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:3:8: 3:9
let mut _0: std::option::Option<std::boxed::Box<()>>; // return place in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:3:31: 3:46
- let mut _2: isize; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:5:9: 5:13
- let _3: std::boxed::Box<()>; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:6:14: 6:15
- let mut _4: std::boxed::Box<()>; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:6:25: 6:26
- let mut _5: bool; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:8:1: 8:2
- let mut _6: isize; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:8:1: 8:2
- let mut _7: isize; // in scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:8:1: 8:2
scope 1 {
debug x => ((_0 as Some).0: std::boxed::Box<()>); // in scope 1 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:4:14: 4:15
debug x => ((_0 as Some).0: std::boxed::Box<()>); // in scope 1 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:6:14: 6:15
}

bb0: {
- _5 = const false; // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:3:9: 3:13
- _5 = const true; // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:3:9: 3:13
- _2 = discriminant(_1); // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:3:9: 3:13
_0 = move _1; // scope 1 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:4:20: 4:27
- _6 = discriminant(_1); // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:6:1: 6:2
return; // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:6:2: 6:2
- _5 = const false; // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:5:9: 5:13
- _5 = const true; // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:5:9: 5:13
- _2 = discriminant(_1); // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:5:9: 5:13
_0 = move _1; // scope 1 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:6:20: 6:27
- _6 = discriminant(_1); // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:8:1: 8:2
return; // scope 0 at $DIR/simplify-locals-removes-unused-discriminant-reads.rs:8:2: 8:2
}
}

1 change: 1 addition & 0 deletions src/test/mir-opt/simplify_try.rs
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@@ -1,3 +1,4 @@
// compile-flags: -Zunsound-mir-opts
// EMIT_MIR simplify_try.try_identity.SimplifyArmIdentity.diff
// EMIT_MIR simplify_try.try_identity.SimplifyBranchSame.after.mir
// EMIT_MIR simplify_try.try_identity.SimplifyLocals.after.mir
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70 changes: 35 additions & 35 deletions src/test/mir-opt/simplify_try.try_identity.DestinationPropagation.diff
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Expand Up @@ -2,35 +2,35 @@
+ // MIR for `try_identity` after DestinationPropagation

fn try_identity(_1: std::result::Result<u32, i32>) -> std::result::Result<u32, i32> {
debug x => _1; // in scope 0 at $DIR/simplify_try.rs:6:17: 6:18
let mut _0: std::result::Result<u32, i32>; // return place in scope 0 at $DIR/simplify_try.rs:6:41: 6:57
let _2: u32; // in scope 0 at $DIR/simplify_try.rs:7:9: 7:10
let mut _3: std::result::Result<u32, i32>; // in scope 0 at $DIR/simplify_try.rs:7:13: 7:15
let mut _4: std::result::Result<u32, i32>; // in scope 0 at $DIR/simplify_try.rs:7:13: 7:14
let mut _5: isize; // in scope 0 at $DIR/simplify_try.rs:7:14: 7:15
let _6: i32; // in scope 0 at $DIR/simplify_try.rs:7:14: 7:15
let mut _7: !; // in scope 0 at $DIR/simplify_try.rs:7:14: 7:15
let mut _8: i32; // in scope 0 at $DIR/simplify_try.rs:7:14: 7:15
let mut _9: i32; // in scope 0 at $DIR/simplify_try.rs:7:14: 7:15
let _10: u32; // in scope 0 at $DIR/simplify_try.rs:7:13: 7:15
let mut _11: u32; // in scope 0 at $DIR/simplify_try.rs:8:8: 8:9
debug x => _1; // in scope 0 at $DIR/simplify_try.rs:7:17: 7:18
let mut _0: std::result::Result<u32, i32>; // return place in scope 0 at $DIR/simplify_try.rs:7:41: 7:57
let _2: u32; // in scope 0 at $DIR/simplify_try.rs:8:9: 8:10
let mut _3: std::result::Result<u32, i32>; // in scope 0 at $DIR/simplify_try.rs:8:13: 8:15
let mut _4: std::result::Result<u32, i32>; // in scope 0 at $DIR/simplify_try.rs:8:13: 8:14
let mut _5: isize; // in scope 0 at $DIR/simplify_try.rs:8:14: 8:15
let _6: i32; // in scope 0 at $DIR/simplify_try.rs:8:14: 8:15
let mut _7: !; // in scope 0 at $DIR/simplify_try.rs:8:14: 8:15
let mut _8: i32; // in scope 0 at $DIR/simplify_try.rs:8:14: 8:15
let mut _9: i32; // in scope 0 at $DIR/simplify_try.rs:8:14: 8:15
let _10: u32; // in scope 0 at $DIR/simplify_try.rs:8:13: 8:15
let mut _11: u32; // in scope 0 at $DIR/simplify_try.rs:9:8: 9:9
scope 1 {
debug y => ((_0 as Ok).0: u32); // in scope 1 at $DIR/simplify_try.rs:7:9: 7:10
debug y => ((_0 as Ok).0: u32); // in scope 1 at $DIR/simplify_try.rs:8:9: 8:10
}
scope 2 {
debug err => ((_0 as Err).0: i32); // in scope 2 at $DIR/simplify_try.rs:7:14: 7:15
debug err => ((_0 as Err).0: i32); // in scope 2 at $DIR/simplify_try.rs:8:14: 8:15
scope 3 {
scope 7 {
debug t => ((_0 as Err).0: i32); // in scope 7 at $SRC_DIR/core/src/convert/mod.rs:LL:COL
}
scope 8 {
debug v => ((_0 as Err).0: i32); // in scope 8 at $SRC_DIR/core/src/result.rs:LL:COL
let mut _12: i32; // in scope 8 at $DIR/simplify_try.rs:7:14: 7:15
let mut _12: i32; // in scope 8 at $DIR/simplify_try.rs:8:14: 8:15
}
}
}
scope 4 {
debug val => ((_0 as Ok).0: u32); // in scope 4 at $DIR/simplify_try.rs:7:13: 7:15
debug val => ((_0 as Ok).0: u32); // in scope 4 at $DIR/simplify_try.rs:8:13: 8:15
scope 5 {
}
}
Expand All @@ -40,33 +40,33 @@
}

bb0: {
StorageLive(_2); // scope 0 at $DIR/simplify_try.rs:7:9: 7:10
- StorageLive(_3); // scope 0 at $DIR/simplify_try.rs:7:13: 7:15
- StorageLive(_4); // scope 0 at $DIR/simplify_try.rs:7:13: 7:14
- _4 = _1; // scope 0 at $DIR/simplify_try.rs:7:13: 7:14
StorageLive(_2); // scope 0 at $DIR/simplify_try.rs:8:9: 8:10
- StorageLive(_3); // scope 0 at $DIR/simplify_try.rs:8:13: 8:15
- StorageLive(_4); // scope 0 at $DIR/simplify_try.rs:8:13: 8:14
- _4 = _1; // scope 0 at $DIR/simplify_try.rs:8:13: 8:14
- _3 = move _4; // scope 6 at $SRC_DIR/core/src/result.rs:LL:COL
- StorageDead(_4); // scope 0 at $DIR/simplify_try.rs:7:14: 7:15
- _5 = discriminant(_3); // scope 0 at $DIR/simplify_try.rs:7:14: 7:15
+ nop; // scope 0 at $DIR/simplify_try.rs:7:13: 7:15
+ nop; // scope 0 at $DIR/simplify_try.rs:7:13: 7:14
+ _0 = _1; // scope 0 at $DIR/simplify_try.rs:7:13: 7:14
- StorageDead(_4); // scope 0 at $DIR/simplify_try.rs:8:14: 8:15
- _5 = discriminant(_3); // scope 0 at $DIR/simplify_try.rs:8:14: 8:15
+ nop; // scope 0 at $DIR/simplify_try.rs:8:13: 8:15
+ nop; // scope 0 at $DIR/simplify_try.rs:8:13: 8:14
+ _0 = _1; // scope 0 at $DIR/simplify_try.rs:8:13: 8:14
+ nop; // scope 6 at $SRC_DIR/core/src/result.rs:LL:COL
+ nop; // scope 0 at $DIR/simplify_try.rs:7:14: 7:15
+ _5 = discriminant(_0); // scope 0 at $DIR/simplify_try.rs:7:14: 7:15
goto -> bb1; // scope 0 at $DIR/simplify_try.rs:7:14: 7:15
+ nop; // scope 0 at $DIR/simplify_try.rs:8:14: 8:15
+ _5 = discriminant(_0); // scope 0 at $DIR/simplify_try.rs:8:14: 8:15
goto -> bb1; // scope 0 at $DIR/simplify_try.rs:8:14: 8:15
}

bb1: {
- _0 = move _3; // scope 1 at $DIR/simplify_try.rs:8:5: 8:10
- StorageDead(_3); // scope 0 at $DIR/simplify_try.rs:7:15: 7:16
+ nop; // scope 1 at $DIR/simplify_try.rs:8:5: 8:10
+ nop; // scope 0 at $DIR/simplify_try.rs:7:15: 7:16
StorageDead(_2); // scope 0 at $DIR/simplify_try.rs:9:1: 9:2
goto -> bb2; // scope 0 at $DIR/simplify_try.rs:9:2: 9:2
- _0 = move _3; // scope 1 at $DIR/simplify_try.rs:9:5: 9:10
- StorageDead(_3); // scope 0 at $DIR/simplify_try.rs:8:15: 8:16
+ nop; // scope 1 at $DIR/simplify_try.rs:9:5: 9:10
+ nop; // scope 0 at $DIR/simplify_try.rs:8:15: 8:16
StorageDead(_2); // scope 0 at $DIR/simplify_try.rs:10:1: 10:2
goto -> bb2; // scope 0 at $DIR/simplify_try.rs:10:2: 10:2
}

bb2: {
return; // scope 0 at $DIR/simplify_try.rs:9:2: 9:2
return; // scope 0 at $DIR/simplify_try.rs:10:2: 10:2
}
}

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