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Enable the SimplifyArmIdentity MIR optimization at mir-opt-level=1 #76308

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Merged
merged 1 commit into from
Sep 8, 2020
+9 −11
Merged

Enable the SimplifyArmIdentity MIR optimization at mir-opt-level=1 #76308

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6 changes: 1 addition & 5 deletions compiler/rustc_mir/src/transform/simplify_try.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -367,11 +367,7 @@ fn optimization_applies<'tcx>(
}

impl<'tcx> MirPass<'tcx> for SimplifyArmIdentity {
fn run_pass(&self, tcx: TyCtxt<'tcx>, source: MirSource<'tcx>, body: &mut Body<'tcx>) {
if tcx.sess.opts.debugging_opts.mir_opt_level < 2 {
return;
}

fn run_pass(&self, _tcx: TyCtxt<'tcx>, source: MirSource<'tcx>, body: &mut Body<'tcx>) {
trace!("running SimplifyArmIdentity on {:?}", source);
let local_uses = LocalUseCounter::get_local_uses(body);
let (basic_blocks, local_decls, debug_info) =
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14 changes: 8 additions & 6 deletions src/test/mir-opt/simplify_try_if_let.{{impl}}-append.SimplifyArmIdentity.diff
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Expand Up @@ -18,7 +18,8 @@
debug tail => _4; // in scope 1 at $DIR/simplify_try_if_let.rs:23:18: 23:26
let _8: std::ptr::NonNull<Node>; // in scope 1 at $DIR/simplify_try_if_let.rs:26:29: 26:39
scope 2 {
debug other_head => _8; // in scope 2 at $DIR/simplify_try_if_let.rs:26:29: 26:39
- debug other_head => _8; // in scope 2 at $DIR/simplify_try_if_let.rs:26:29: 26:39
+ debug other_head => ((_9 as Some).0: std::ptr::NonNull<Node>); // in scope 2 at $DIR/simplify_try_if_let.rs:26:29: 26:39
scope 3 {
}
}
Expand Down Expand Up @@ -65,11 +66,12 @@
StorageLive(_8); // scope 1 at $DIR/simplify_try_if_let.rs:26:29: 26:39
_8 = ((_5 as Some).0: std::ptr::NonNull<Node>); // scope 1 at $DIR/simplify_try_if_let.rs:26:29: 26:39
StorageLive(_9); // scope 3 at $DIR/simplify_try_if_let.rs:28:46: 28:62
StorageLive(_10); // scope 3 at $DIR/simplify_try_if_let.rs:28:51: 28:61
_10 = _8; // scope 3 at $DIR/simplify_try_if_let.rs:28:51: 28:61
((_9 as Some).0: std::ptr::NonNull<Node>) = move _10; // scope 3 at $DIR/simplify_try_if_let.rs:28:46: 28:62
discriminant(_9) = 1; // scope 3 at $DIR/simplify_try_if_let.rs:28:46: 28:62
StorageDead(_10); // scope 3 at $DIR/simplify_try_if_let.rs:28:61: 28:62
- StorageLive(_10); // scope 3 at $DIR/simplify_try_if_let.rs:28:51: 28:61
- _10 = _8; // scope 3 at $DIR/simplify_try_if_let.rs:28:51: 28:61
- ((_9 as Some).0: std::ptr::NonNull<Node>) = move _10; // scope 3 at $DIR/simplify_try_if_let.rs:28:46: 28:62
- discriminant(_9) = 1; // scope 3 at $DIR/simplify_try_if_let.rs:28:46: 28:62
- StorageDead(_10); // scope 3 at $DIR/simplify_try_if_let.rs:28:61: 28:62
+ _9 = move _5; // scope 3 at $DIR/simplify_try_if_let.rs:28:46: 28:62
StorageLive(_11); // scope 3 at $DIR/simplify_try_if_let.rs:28:25: 28:38
StorageLive(_12); // scope 3 at $DIR/simplify_try_if_let.rs:28:25: 28:29
_12 = &mut _4; // scope 3 at $DIR/simplify_try_if_let.rs:28:25: 28:29
Expand Down