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optimizing Use expressions inside if condition #111644

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849af1b
optimizing Use expressions inside if condition
azizghuloum May 16, 2023
5693a02
Merge branch 'rust-lang:master' into master
azizghuloum May 16, 2023
1a42cdc
Merge branch 'rust-lang:master' into master
azizghuloum May 16, 2023
b735474
added test for "if e0 && e2 && e3 {}" ensuring that drops dont get dr…
azizghuloum May 19, 2023
a1847f9
added test case from issue https://github.com/rust-lang/rust/issues/1…
azizghuloum May 19, 2023
1335983
modified test to remove explicit blocks in if
azizghuloum May 19, 2023
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7 changes: 7 additions & 0 deletions compiler/rustc_mir_build/src/build/matches/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -76,6 +76,13 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
)
})
}
ExprKind::Use { source } => this.then_else_break(
block,
&this.thir[source],
temp_scope_override,
break_scope,
variable_source_info,
),
ExprKind::Let { expr, ref pat } => this.lower_let_expr(
block,
&this.thir[expr],
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3 changes: 2 additions & 1 deletion tests/mir-opt/bool_compare.opt1.InstSimplify.diff
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Original file line number Diff line number Diff line change
Expand Up @@ -13,16 +13,17 @@
_3 = _1; // scope 0 at $DIR/bool_compare.rs:+1:8: +1:9
- _2 = Ne(move _3, const true); // scope 0 at $DIR/bool_compare.rs:+1:8: +1:17
+ _2 = Not(move _3); // scope 0 at $DIR/bool_compare.rs:+1:8: +1:17
StorageDead(_3); // scope 0 at $DIR/bool_compare.rs:+1:16: +1:17
switchInt(move _2) -> [0: bb2, otherwise: bb1]; // scope 0 at $DIR/bool_compare.rs:+1:8: +1:17
}

bb1: {
StorageDead(_3); // scope 0 at $DIR/bool_compare.rs:+1:16: +1:17
_0 = const 0_u32; // scope 0 at $DIR/bool_compare.rs:+1:20: +1:21
goto -> bb3; // scope 0 at $DIR/bool_compare.rs:+1:5: +1:34
}

bb2: {
StorageDead(_3); // scope 0 at $DIR/bool_compare.rs:+1:16: +1:17
_0 = const 1_u32; // scope 0 at $DIR/bool_compare.rs:+1:31: +1:32
goto -> bb3; // scope 0 at $DIR/bool_compare.rs:+1:5: +1:34
}
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3 changes: 2 additions & 1 deletion tests/mir-opt/bool_compare.opt2.InstSimplify.diff
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Original file line number Diff line number Diff line change
Expand Up @@ -13,16 +13,17 @@
_3 = _1; // scope 0 at $DIR/bool_compare.rs:+1:16: +1:17
- _2 = Ne(const true, move _3); // scope 0 at $DIR/bool_compare.rs:+1:8: +1:17
+ _2 = Not(move _3); // scope 0 at $DIR/bool_compare.rs:+1:8: +1:17
StorageDead(_3); // scope 0 at $DIR/bool_compare.rs:+1:16: +1:17
switchInt(move _2) -> [0: bb2, otherwise: bb1]; // scope 0 at $DIR/bool_compare.rs:+1:8: +1:17
}

bb1: {
StorageDead(_3); // scope 0 at $DIR/bool_compare.rs:+1:16: +1:17
_0 = const 0_u32; // scope 0 at $DIR/bool_compare.rs:+1:20: +1:21
goto -> bb3; // scope 0 at $DIR/bool_compare.rs:+1:5: +1:34
}

bb2: {
StorageDead(_3); // scope 0 at $DIR/bool_compare.rs:+1:16: +1:17
_0 = const 1_u32; // scope 0 at $DIR/bool_compare.rs:+1:31: +1:32
goto -> bb3; // scope 0 at $DIR/bool_compare.rs:+1:5: +1:34
}
Expand Down
3 changes: 2 additions & 1 deletion tests/mir-opt/bool_compare.opt3.InstSimplify.diff
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Original file line number Diff line number Diff line change
Expand Up @@ -13,16 +13,17 @@
_3 = _1; // scope 0 at $DIR/bool_compare.rs:+1:8: +1:9
- _2 = Eq(move _3, const false); // scope 0 at $DIR/bool_compare.rs:+1:8: +1:18
+ _2 = Not(move _3); // scope 0 at $DIR/bool_compare.rs:+1:8: +1:18
StorageDead(_3); // scope 0 at $DIR/bool_compare.rs:+1:17: +1:18
switchInt(move _2) -> [0: bb2, otherwise: bb1]; // scope 0 at $DIR/bool_compare.rs:+1:8: +1:18
}

bb1: {
StorageDead(_3); // scope 0 at $DIR/bool_compare.rs:+1:17: +1:18
_0 = const 0_u32; // scope 0 at $DIR/bool_compare.rs:+1:21: +1:22
goto -> bb3; // scope 0 at $DIR/bool_compare.rs:+1:5: +1:35
}

bb2: {
StorageDead(_3); // scope 0 at $DIR/bool_compare.rs:+1:17: +1:18
_0 = const 1_u32; // scope 0 at $DIR/bool_compare.rs:+1:32: +1:33
goto -> bb3; // scope 0 at $DIR/bool_compare.rs:+1:5: +1:35
}
Expand Down
3 changes: 2 additions & 1 deletion tests/mir-opt/bool_compare.opt4.InstSimplify.diff
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Original file line number Diff line number Diff line change
Expand Up @@ -13,16 +13,17 @@
_3 = _1; // scope 0 at $DIR/bool_compare.rs:+1:17: +1:18
- _2 = Eq(const false, move _3); // scope 0 at $DIR/bool_compare.rs:+1:8: +1:18
+ _2 = Not(move _3); // scope 0 at $DIR/bool_compare.rs:+1:8: +1:18
StorageDead(_3); // scope 0 at $DIR/bool_compare.rs:+1:17: +1:18
switchInt(move _2) -> [0: bb2, otherwise: bb1]; // scope 0 at $DIR/bool_compare.rs:+1:8: +1:18
}

bb1: {
StorageDead(_3); // scope 0 at $DIR/bool_compare.rs:+1:17: +1:18
_0 = const 0_u32; // scope 0 at $DIR/bool_compare.rs:+1:21: +1:22
goto -> bb3; // scope 0 at $DIR/bool_compare.rs:+1:5: +1:35
}

bb2: {
StorageDead(_3); // scope 0 at $DIR/bool_compare.rs:+1:17: +1:18
_0 = const 1_u32; // scope 0 at $DIR/bool_compare.rs:+1:32: +1:33
goto -> bb3; // scope 0 at $DIR/bool_compare.rs:+1:5: +1:35
}
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113 changes: 113 additions & 0 deletions tests/mir-opt/building/logical_and_in_conditional.function_from_issue_111583.built.after.mir
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Original file line number Diff line number Diff line change
@@ -0,0 +1,113 @@
// MIR for `function_from_issue_111583` after built

fn function_from_issue_111583(_1: f64) -> () {
debug z => _1; // in scope 0 at $DIR/logical_and_in_conditional.rs:+0:31: +0:32
let mut _0: (); // return place in scope 0 at $DIR/logical_and_in_conditional.rs:+0:39: +0:39
let _2: u64; // in scope 0 at $DIR/logical_and_in_conditional.rs:+1:9: +1:13
let mut _3: u64; // in scope 0 at $DIR/logical_and_in_conditional.rs:+1:16: +1:25
let mut _5: bool; // in scope 0 at $DIR/logical_and_in_conditional.rs:+3:8: +3:38
let mut _6: u64; // in scope 0 at $DIR/logical_and_in_conditional.rs:+3:8: +3:33
let mut _7: u64; // in scope 0 at $DIR/logical_and_in_conditional.rs:+3:8: +3:26
let mut _8: u64; // in scope 0 at $DIR/logical_and_in_conditional.rs:+3:9: +3:20
let mut _9: f64; // in scope 0 at $DIR/logical_and_in_conditional.rs:+3:9: +3:10
let mut _10: u64; // in scope 0 at $DIR/logical_and_in_conditional.rs:+3:29: +3:33
let mut _11: bool; // in scope 0 at $DIR/logical_and_in_conditional.rs:+3:42: +3:60
let mut _12: f64; // in scope 0 at $DIR/logical_and_in_conditional.rs:+3:42: +3:52
let mut _13: f64; // in scope 0 at $DIR/logical_and_in_conditional.rs:+3:42: +3:43
scope 1 {
debug mask => _2; // in scope 1 at $DIR/logical_and_in_conditional.rs:+1:9: +1:13
let mut _4: i32; // in scope 1 at $DIR/logical_and_in_conditional.rs:+2:9: +2:16
scope 2 {
debug ret => _4; // in scope 2 at $DIR/logical_and_in_conditional.rs:+2:9: +2:16
}
}

bb0: {
StorageLive(_2); // scope 0 at $DIR/logical_and_in_conditional.rs:+1:9: +1:13
StorageLive(_3); // scope 0 at $DIR/logical_and_in_conditional.rs:+1:16: +1:25
_3 = Shl(const 1_u64, const 38_i32); // scope 0 at $DIR/logical_and_in_conditional.rs:+1:16: +1:25
_2 = Sub(move _3, const 1_u64); // scope 0 at $DIR/logical_and_in_conditional.rs:+1:16: +1:29
StorageDead(_3); // scope 0 at $DIR/logical_and_in_conditional.rs:+1:28: +1:29
FakeRead(ForLet(None), _2); // scope 0 at $DIR/logical_and_in_conditional.rs:+1:9: +1:13
StorageLive(_4); // scope 1 at $DIR/logical_and_in_conditional.rs:+2:9: +2:16
_4 = const 0_i32; // scope 1 at $DIR/logical_and_in_conditional.rs:+2:19: +2:20
FakeRead(ForLet(None), _4); // scope 1 at $DIR/logical_and_in_conditional.rs:+2:9: +2:16
StorageLive(_5); // scope 2 at $DIR/logical_and_in_conditional.rs:+3:8: +3:38
StorageLive(_6); // scope 2 at $DIR/logical_and_in_conditional.rs:+3:8: +3:33
StorageLive(_7); // scope 2 at $DIR/logical_and_in_conditional.rs:+3:8: +3:26
StorageLive(_8); // scope 2 at $DIR/logical_and_in_conditional.rs:+3:9: +3:20
StorageLive(_9); // scope 2 at $DIR/logical_and_in_conditional.rs:+3:9: +3:10
_9 = _1; // scope 2 at $DIR/logical_and_in_conditional.rs:+3:9: +3:10
_8 = core::f64::<impl f64>::to_bits(move _9) -> [return: bb1, unwind: bb10]; // scope 2 at $DIR/logical_and_in_conditional.rs:+3:9: +3:20
// mir::Constant
// + span: $DIR/logical_and_in_conditional.rs:28:11: 28:18
// + literal: Const { ty: fn(f64) -> u64 {core::f64::<impl f64>::to_bits}, val: Value(<ZST>) }
}

bb1: {
StorageDead(_9); // scope 2 at $DIR/logical_and_in_conditional.rs:+3:19: +3:20
_7 = Shr(move _8, const 8_i32); // scope 2 at $DIR/logical_and_in_conditional.rs:+3:8: +3:26
StorageDead(_8); // scope 2 at $DIR/logical_and_in_conditional.rs:+3:25: +3:26
StorageLive(_10); // scope 2 at $DIR/logical_and_in_conditional.rs:+3:29: +3:33
_10 = _2; // scope 2 at $DIR/logical_and_in_conditional.rs:+3:29: +3:33
_6 = BitAnd(move _7, move _10); // scope 2 at $DIR/logical_and_in_conditional.rs:+3:8: +3:33
StorageDead(_10); // scope 2 at $DIR/logical_and_in_conditional.rs:+3:32: +3:33
StorageDead(_7); // scope 2 at $DIR/logical_and_in_conditional.rs:+3:32: +3:33
_5 = Eq(move _6, const 0_u64); // scope 2 at $DIR/logical_and_in_conditional.rs:+3:8: +3:38
switchInt(move _5) -> [0: bb3, otherwise: bb2]; // scope 2 at $DIR/logical_and_in_conditional.rs:+3:8: +3:38
}

bb2: {
StorageDead(_6); // scope 2 at $DIR/logical_and_in_conditional.rs:+3:37: +3:38
StorageLive(_11); // scope 2 at $DIR/logical_and_in_conditional.rs:+3:42: +3:60
StorageLive(_12); // scope 2 at $DIR/logical_and_in_conditional.rs:+3:42: +3:52
StorageLive(_13); // scope 2 at $DIR/logical_and_in_conditional.rs:+3:42: +3:43
_13 = _1; // scope 2 at $DIR/logical_and_in_conditional.rs:+3:42: +3:43
_12 = Rem(move _13, const 0.0625f64); // scope 2 at $DIR/logical_and_in_conditional.rs:+3:42: +3:52
StorageDead(_13); // scope 2 at $DIR/logical_and_in_conditional.rs:+3:51: +3:52
_11 = Lt(move _12, const 1.0E-13f64); // scope 2 at $DIR/logical_and_in_conditional.rs:+3:42: +3:60
switchInt(move _11) -> [0: bb5, otherwise: bb4]; // scope 2 at $DIR/logical_and_in_conditional.rs:+3:42: +3:60
}

bb3: {
goto -> bb7; // scope 2 at $DIR/logical_and_in_conditional.rs:+3:8: +3:38
}

bb4: {
StorageDead(_12); // scope 2 at $DIR/logical_and_in_conditional.rs:+3:59: +3:60
_4 = Add(_4, const 1_i32); // scope 2 at $DIR/logical_and_in_conditional.rs:+4:9: +4:17
_0 = const (); // scope 2 at $DIR/logical_and_in_conditional.rs:+3:61: +5:6
goto -> bb9; // scope 2 at $DIR/logical_and_in_conditional.rs:+3:5: +5:6
}

bb5: {
goto -> bb6; // scope 2 at $DIR/logical_and_in_conditional.rs:+3:42: +3:60
}

bb6: {
StorageDead(_12); // scope 2 at $DIR/logical_and_in_conditional.rs:+3:59: +3:60
goto -> bb8; // scope 2 at no-location
}

bb7: {
StorageDead(_6); // scope 2 at $DIR/logical_and_in_conditional.rs:+3:37: +3:38
goto -> bb8; // scope 2 at no-location
}

bb8: {
_0 = const (); // scope 2 at $DIR/logical_and_in_conditional.rs:+5:6: +5:6
goto -> bb9; // scope 2 at $DIR/logical_and_in_conditional.rs:+3:5: +5:6
}

bb9: {
StorageDead(_11); // scope 2 at $DIR/logical_and_in_conditional.rs:+5:5: +5:6
StorageDead(_5); // scope 2 at $DIR/logical_and_in_conditional.rs:+5:5: +5:6
StorageDead(_4); // scope 1 at $DIR/logical_and_in_conditional.rs:+6:1: +6:2
StorageDead(_2); // scope 0 at $DIR/logical_and_in_conditional.rs:+6:1: +6:2
return; // scope 0 at $DIR/logical_and_in_conditional.rs:+6:2: +6:2
}

bb10 (cleanup): {
resume; // scope 0 at $DIR/logical_and_in_conditional.rs:+0:1: +6:2
}
}
42 changes: 42 additions & 0 deletions tests/mir-opt/building/logical_and_in_conditional.rs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,42 @@
struct Droppy;

impl Drop for Droppy {
fn drop(&mut self) {
println!("drop");
}
}

// EMIT_MIR logical_and_in_conditional.test_and.built.after.mir
fn test_and(a: i32, b: i32, c: i32) {
if {
let _t = Droppy;
a == 0
} && {
let _t = Droppy;
b == 0
} && {
let _t = Droppy;
c == 0
} {}
}

// https://github.com/rust-lang/rust/issues/111583
// EMIT_MIR logical_and_in_conditional.function_from_issue_111583.built.after.mir
fn function_from_issue_111583(z: f64) {
let mask = (1 << 38) - 1;
let mut ret = 0;
if (z.to_bits() >> 8) & mask == 0 && z % 0.0625 < 1e-13 {
ret += 1;
}
}

fn main() {
function_from_issue_111583(0.0);
for a in 0..1 {
for b in 0..1 {
for c in 0..1 {
test_and(a, b, c);
}
}
}
}
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