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Introduce a temporary for discriminant value in MatchBranchSimplification

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The optimization introduces additional uses of the discriminant operand, but
does not ensure that it is still valid to evaluate it or that it still
evaluates to the same value.

Evaluate it once at original position, and store the result in a new temporary.
This commit is contained in:
Tomasz Miąsko 2020-10-21 00:00:00 +00:00
parent f965120ad3
commit a4dc92b483
9 changed files with 311 additions and 50 deletions
Download patch file Download diff file Expand all files Collapse all files

8
src/test/mir-opt/matches_reduce_branches.bar.MatchBranchSimplification.32bit.diff
View file

@ -10,6 +10,7 @@
let mut _8: bool; // in scope 0 at $DIR/matches_reduce_branches.rs:35:9: 35:10
let mut _9: bool; // in scope 0 at $DIR/matches_reduce_branches.rs:35:12: 35:13
let mut _10: bool; // in scope 0 at $DIR/matches_reduce_branches.rs:35:15: 35:16
+ let mut _11: i32; // in scope 0 at $DIR/matches_reduce_branches.rs:19:9: 19:10
scope 1 {
debug a => _2; // in scope 1 at $DIR/matches_reduce_branches.rs:13:9: 13:10
let _3: bool; // in scope 1 at $DIR/matches_reduce_branches.rs:14:9: 14:10
@ -33,10 +34,13 @@
StorageLive(_5); // scope 3 at $DIR/matches_reduce_branches.rs:16:9: 16:10
StorageLive(_6); // scope 4 at $DIR/matches_reduce_branches.rs:18:5: 33:6
- switchInt(_1) -> [7_i32: bb2, otherwise: bb1]; // scope 4 at $DIR/matches_reduce_branches.rs:19:9: 19:10
+ _2 = Ne(_1, const 7_i32); // scope 4 at $DIR/matches_reduce_branches.rs:20:13: 20:22
+ _3 = Eq(_1, const 7_i32); // scope 4 at $DIR/matches_reduce_branches.rs:21:13: 21:21
+ StorageLive(_11); // scope 4 at $DIR/matches_reduce_branches.rs:19:9: 19:10
+ _11 = _1; // scope 4 at $DIR/matches_reduce_branches.rs:19:9: 19:10
+ _2 = Ne(_11, const 7_i32); // scope 4 at $DIR/matches_reduce_branches.rs:20:13: 20:22
+ _3 = Eq(_11, const 7_i32); // scope 4 at $DIR/matches_reduce_branches.rs:21:13: 21:21
+ _4 = const false; // scope 4 at $DIR/matches_reduce_branches.rs:22:13: 22:22
+ _5 = const true; // scope 4 at $DIR/matches_reduce_branches.rs:23:13: 23:21
+ StorageDead(_11); // scope 4 at $DIR/matches_reduce_branches.rs:19:9: 19:10
+ goto -> bb3; // scope 4 at $DIR/matches_reduce_branches.rs:19:9: 19:10
}

8
src/test/mir-opt/matches_reduce_branches.bar.MatchBranchSimplification.64bit.diff
View file

@ -10,6 +10,7 @@
let mut _8: bool; // in scope 0 at $DIR/matches_reduce_branches.rs:35:9: 35:10
let mut _9: bool; // in scope 0 at $DIR/matches_reduce_branches.rs:35:12: 35:13
let mut _10: bool; // in scope 0 at $DIR/matches_reduce_branches.rs:35:15: 35:16
+ let mut _11: i32; // in scope 0 at $DIR/matches_reduce_branches.rs:19:9: 19:10
scope 1 {
debug a => _2; // in scope 1 at $DIR/matches_reduce_branches.rs:13:9: 13:10
let _3: bool; // in scope 1 at $DIR/matches_reduce_branches.rs:14:9: 14:10
@ -33,10 +34,13 @@
StorageLive(_5); // scope 3 at $DIR/matches_reduce_branches.rs:16:9: 16:10
StorageLive(_6); // scope 4 at $DIR/matches_reduce_branches.rs:18:5: 33:6
- switchInt(_1) -> [7_i32: bb2, otherwise: bb1]; // scope 4 at $DIR/matches_reduce_branches.rs:19:9: 19:10
+ _2 = Ne(_1, const 7_i32); // scope 4 at $DIR/matches_reduce_branches.rs:20:13: 20:22
+ _3 = Eq(_1, const 7_i32); // scope 4 at $DIR/matches_reduce_branches.rs:21:13: 21:21
+ StorageLive(_11); // scope 4 at $DIR/matches_reduce_branches.rs:19:9: 19:10
+ _11 = _1; // scope 4 at $DIR/matches_reduce_branches.rs:19:9: 19:10
+ _2 = Ne(_11, const 7_i32); // scope 4 at $DIR/matches_reduce_branches.rs:20:13: 20:22
+ _3 = Eq(_11, const 7_i32); // scope 4 at $DIR/matches_reduce_branches.rs:21:13: 21:21
+ _4 = const false; // scope 4 at $DIR/matches_reduce_branches.rs:22:13: 22:22
+ _5 = const true; // scope 4 at $DIR/matches_reduce_branches.rs:23:13: 23:21
+ StorageDead(_11); // scope 4 at $DIR/matches_reduce_branches.rs:19:9: 19:10
+ goto -> bb3; // scope 4 at $DIR/matches_reduce_branches.rs:19:9: 19:10
}

6
src/test/mir-opt/matches_reduce_branches.foo.MatchBranchSimplification.32bit.diff
View file

@ -6,12 +6,16 @@
let mut _0: (); // return place in scope 0 at $DIR/matches_reduce_branches.rs:6:25: 6:25
let mut _2: bool; // in scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
let mut _3: isize; // in scope 0 at $DIR/matches_reduce_branches.rs:7:22: 7:26
+ let mut _4: isize; // in scope 0 at $DIR/matches_reduce_branches.rs:7:22: 7:26
bb0: {
StorageLive(_2); // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
_3 = discriminant(_1); // scope 0 at $DIR/matches_reduce_branches.rs:7:22: 7:26
- switchInt(move _3) -> [0_isize: bb2, otherwise: bb1]; // scope 0 at $DIR/matches_reduce_branches.rs:7:22: 7:26
+ _2 = Eq(_3, const 0_isize); // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
+ StorageLive(_4); // scope 0 at $DIR/matches_reduce_branches.rs:7:22: 7:26
+ _4 = move _3; // scope 0 at $DIR/matches_reduce_branches.rs:7:22: 7:26
+ _2 = Eq(_4, const 0_isize); // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
+ StorageDead(_4); // scope 0 at $DIR/matches_reduce_branches.rs:7:22: 7:26
+ goto -> bb3; // scope 0 at $DIR/matches_reduce_branches.rs:7:22: 7:26
}

6
src/test/mir-opt/matches_reduce_branches.foo.MatchBranchSimplification.64bit.diff
View file

@ -6,12 +6,16 @@
let mut _0: (); // return place in scope 0 at $DIR/matches_reduce_branches.rs:6:25: 6:25
let mut _2: bool; // in scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
let mut _3: isize; // in scope 0 at $DIR/matches_reduce_branches.rs:7:22: 7:26
+ let mut _4: isize; // in scope 0 at $DIR/matches_reduce_branches.rs:7:22: 7:26
bb0: {
StorageLive(_2); // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
_3 = discriminant(_1); // scope 0 at $DIR/matches_reduce_branches.rs:7:22: 7:26
- switchInt(move _3) -> [0_isize: bb2, otherwise: bb1]; // scope 0 at $DIR/matches_reduce_branches.rs:7:22: 7:26
+ _2 = Eq(_3, const 0_isize); // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
+ StorageLive(_4); // scope 0 at $DIR/matches_reduce_branches.rs:7:22: 7:26
+ _4 = move _3; // scope 0 at $DIR/matches_reduce_branches.rs:7:22: 7:26
+ _2 = Eq(_4, const 0_isize); // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
+ StorageDead(_4); // scope 0 at $DIR/matches_reduce_branches.rs:7:22: 7:26
+ goto -> bb3; // scope 0 at $DIR/matches_reduce_branches.rs:7:22: 7:26
}

116
src/test/mir-opt/matches_reduce_branches.match_nested_if.MatchBranchSimplification.32bit.diff Normal file
View file

@ -0,0 +1,116 @@
- // MIR for `match_nested_if` before MatchBranchSimplification
+ // MIR for `match_nested_if` after MatchBranchSimplification
fn match_nested_if() -> bool {
let mut _0: bool; // return place in scope 0 at $DIR/matches_reduce_branches.rs:38:25: 38:29
let _1: bool; // in scope 0 at $DIR/matches_reduce_branches.rs:39:9: 39:12
let mut _2: (); // in scope 0 at $DIR/matches_reduce_branches.rs:39:21: 39:23
let mut _3: bool; // in scope 0 at $DIR/matches_reduce_branches.rs:40:15: 40:88
let mut _4: bool; // in scope 0 at $DIR/matches_reduce_branches.rs:40:18: 40:68
let mut _5: bool; // in scope 0 at $DIR/matches_reduce_branches.rs:40:21: 40:48
let mut _6: bool; // in scope 0 at $DIR/matches_reduce_branches.rs:40:24: 40:28
+ let mut _7: bool; // in scope 0 at $DIR/matches_reduce_branches.rs:40:21: 40:48
+ let mut _8: bool; // in scope 0 at $DIR/matches_reduce_branches.rs:40:18: 40:68
+ let mut _9: bool; // in scope 0 at $DIR/matches_reduce_branches.rs:40:15: 40:88
+ let mut _10: bool; // in scope 0 at $DIR/matches_reduce_branches.rs:40:15: 40:88
scope 1 {
debug val => _1; // in scope 1 at $DIR/matches_reduce_branches.rs:39:9: 39:12
}
bb0: {
StorageLive(_1); // scope 0 at $DIR/matches_reduce_branches.rs:39:9: 39:12
StorageLive(_2); // scope 0 at $DIR/matches_reduce_branches.rs:39:21: 39:23
StorageLive(_3); // scope 0 at $DIR/matches_reduce_branches.rs:40:15: 40:88
StorageLive(_4); // scope 0 at $DIR/matches_reduce_branches.rs:40:18: 40:68
StorageLive(_5); // scope 0 at $DIR/matches_reduce_branches.rs:40:21: 40:48
StorageLive(_6); // scope 0 at $DIR/matches_reduce_branches.rs:40:24: 40:28
_6 = const true; // scope 0 at $DIR/matches_reduce_branches.rs:40:24: 40:28
- switchInt(_6) -> [false: bb2, otherwise: bb1]; // scope 0 at $DIR/matches_reduce_branches.rs:40:21: 40:48
+ StorageLive(_7); // scope 0 at $DIR/matches_reduce_branches.rs:40:21: 40:48
+ _7 = _6; // scope 0 at $DIR/matches_reduce_branches.rs:40:21: 40:48
+ _5 = Ne(_7, const false); // scope 0 at $DIR/matches_reduce_branches.rs:40:42: 40:47
+ StorageDead(_7); // scope 0 at $DIR/matches_reduce_branches.rs:40:21: 40:48
+ goto -> bb3; // scope 0 at $DIR/matches_reduce_branches.rs:40:21: 40:48
}
bb1: {
_5 = const true; // scope 0 at $DIR/matches_reduce_branches.rs:40:30: 40:34
goto -> bb3; // scope 0 at $DIR/matches_reduce_branches.rs:40:21: 40:48
}
bb2: {
_5 = const false; // scope 0 at $DIR/matches_reduce_branches.rs:40:42: 40:47
goto -> bb3; // scope 0 at $DIR/matches_reduce_branches.rs:40:21: 40:48
}
bb3: {
StorageDead(_6); // scope 0 at $DIR/matches_reduce_branches.rs:40:47: 40:48
- switchInt(_5) -> [false: bb4, otherwise: bb5]; // scope 0 at $DIR/matches_reduce_branches.rs:40:18: 40:68
+ StorageLive(_8); // scope 0 at $DIR/matches_reduce_branches.rs:40:18: 40:68
+ _8 = _5; // scope 0 at $DIR/matches_reduce_branches.rs:40:18: 40:68
+ _4 = Ne(_8, const false); // scope 0 at $DIR/matches_reduce_branches.rs:40:62: 40:67
+ StorageDead(_8); // scope 0 at $DIR/matches_reduce_branches.rs:40:18: 40:68
+ goto -> bb6; // scope 0 at $DIR/matches_reduce_branches.rs:40:18: 40:68
}
bb4: {
_4 = const false; // scope 0 at $DIR/matches_reduce_branches.rs:40:62: 40:67
goto -> bb6; // scope 0 at $DIR/matches_reduce_branches.rs:40:18: 40:68
}
bb5: {
_4 = const true; // scope 0 at $DIR/matches_reduce_branches.rs:40:50: 40:54
goto -> bb6; // scope 0 at $DIR/matches_reduce_branches.rs:40:18: 40:68
}
bb6: {
StorageDead(_5); // scope 0 at $DIR/matches_reduce_branches.rs:40:67: 40:68
- switchInt(_4) -> [false: bb7, otherwise: bb8]; // scope 0 at $DIR/matches_reduce_branches.rs:40:15: 40:88
+ StorageLive(_9); // scope 0 at $DIR/matches_reduce_branches.rs:40:15: 40:88
+ _9 = _4; // scope 0 at $DIR/matches_reduce_branches.rs:40:15: 40:88
+ _3 = Ne(_9, const false); // scope 0 at $DIR/matches_reduce_branches.rs:40:82: 40:87
+ StorageDead(_9); // scope 0 at $DIR/matches_reduce_branches.rs:40:15: 40:88
+ goto -> bb9; // scope 0 at $DIR/matches_reduce_branches.rs:40:15: 40:88
}
bb7: {
_3 = const false; // scope 0 at $DIR/matches_reduce_branches.rs:40:82: 40:87
goto -> bb9; // scope 0 at $DIR/matches_reduce_branches.rs:40:15: 40:88
}
bb8: {
_3 = const true; // scope 0 at $DIR/matches_reduce_branches.rs:40:70: 40:74
goto -> bb9; // scope 0 at $DIR/matches_reduce_branches.rs:40:15: 40:88
}
bb9: {
StorageDead(_4); // scope 0 at $DIR/matches_reduce_branches.rs:40:87: 40:88
- switchInt(move _3) -> [false: bb11, otherwise: bb10]; // scope 0 at $DIR/matches_reduce_branches.rs:40:15: 40:88
+ StorageLive(_10); // scope 0 at $DIR/matches_reduce_branches.rs:40:15: 40:88
+ _10 = move _3; // scope 0 at $DIR/matches_reduce_branches.rs:40:15: 40:88
+ StorageDead(_3); // scope 0 at $DIR/matches_reduce_branches.rs:40:95: 40:96
+ _1 = Ne(_10, const false); // scope 0 at $DIR/matches_reduce_branches.rs:41:14: 41:19
+ StorageDead(_10); // scope 0 at $DIR/matches_reduce_branches.rs:40:15: 40:88
+ goto -> bb12; // scope 0 at $DIR/matches_reduce_branches.rs:40:15: 40:88
}
bb10: {
StorageDead(_3); // scope 0 at $DIR/matches_reduce_branches.rs:40:95: 40:96
_1 = const true; // scope 0 at $DIR/matches_reduce_branches.rs:40:92: 40:96
goto -> bb12; // scope 0 at $DIR/matches_reduce_branches.rs:39:15: 42:6
}
bb11: {
StorageDead(_3); // scope 0 at $DIR/matches_reduce_branches.rs:40:95: 40:96
_1 = const false; // scope 0 at $DIR/matches_reduce_branches.rs:41:14: 41:19
goto -> bb12; // scope 0 at $DIR/matches_reduce_branches.rs:39:15: 42:6
}
bb12: {
StorageDead(_2); // scope 0 at $DIR/matches_reduce_branches.rs:42:6: 42:7
_0 = _1; // scope 1 at $DIR/matches_reduce_branches.rs:43:5: 43:8
StorageDead(_1); // scope 0 at $DIR/matches_reduce_branches.rs:44:1: 44:2
return; // scope 0 at $DIR/matches_reduce_branches.rs:44:2: 44:2
}
}

116
src/test/mir-opt/matches_reduce_branches.match_nested_if.MatchBranchSimplification.64bit.diff Normal file
View file

@ -0,0 +1,116 @@
- // MIR for `match_nested_if` before MatchBranchSimplification
+ // MIR for `match_nested_if` after MatchBranchSimplification
fn match_nested_if() -> bool {
let mut _0: bool; // return place in scope 0 at $DIR/matches_reduce_branches.rs:38:25: 38:29
let _1: bool; // in scope 0 at $DIR/matches_reduce_branches.rs:39:9: 39:12
let mut _2: (); // in scope 0 at $DIR/matches_reduce_branches.rs:39:21: 39:23
let mut _3: bool; // in scope 0 at $DIR/matches_reduce_branches.rs:40:15: 40:88
let mut _4: bool; // in scope 0 at $DIR/matches_reduce_branches.rs:40:18: 40:68
let mut _5: bool; // in scope 0 at $DIR/matches_reduce_branches.rs:40:21: 40:48
let mut _6: bool; // in scope 0 at $DIR/matches_reduce_branches.rs:40:24: 40:28
+ let mut _7: bool; // in scope 0 at $DIR/matches_reduce_branches.rs:40:21: 40:48
+ let mut _8: bool; // in scope 0 at $DIR/matches_reduce_branches.rs:40:18: 40:68
+ let mut _9: bool; // in scope 0 at $DIR/matches_reduce_branches.rs:40:15: 40:88
+ let mut _10: bool; // in scope 0 at $DIR/matches_reduce_branches.rs:40:15: 40:88
scope 1 {
debug val => _1; // in scope 1 at $DIR/matches_reduce_branches.rs:39:9: 39:12
}
bb0: {
StorageLive(_1); // scope 0 at $DIR/matches_reduce_branches.rs:39:9: 39:12
StorageLive(_2); // scope 0 at $DIR/matches_reduce_branches.rs:39:21: 39:23
StorageLive(_3); // scope 0 at $DIR/matches_reduce_branches.rs:40:15: 40:88
StorageLive(_4); // scope 0 at $DIR/matches_reduce_branches.rs:40:18: 40:68
StorageLive(_5); // scope 0 at $DIR/matches_reduce_branches.rs:40:21: 40:48
StorageLive(_6); // scope 0 at $DIR/matches_reduce_branches.rs:40:24: 40:28
_6 = const true; // scope 0 at $DIR/matches_reduce_branches.rs:40:24: 40:28
- switchInt(_6) -> [false: bb2, otherwise: bb1]; // scope 0 at $DIR/matches_reduce_branches.rs:40:21: 40:48
+ StorageLive(_7); // scope 0 at $DIR/matches_reduce_branches.rs:40:21: 40:48
+ _7 = _6; // scope 0 at $DIR/matches_reduce_branches.rs:40:21: 40:48
+ _5 = Ne(_7, const false); // scope 0 at $DIR/matches_reduce_branches.rs:40:42: 40:47
+ StorageDead(_7); // scope 0 at $DIR/matches_reduce_branches.rs:40:21: 40:48
+ goto -> bb3; // scope 0 at $DIR/matches_reduce_branches.rs:40:21: 40:48
}
bb1: {
_5 = const true; // scope 0 at $DIR/matches_reduce_branches.rs:40:30: 40:34
goto -> bb3; // scope 0 at $DIR/matches_reduce_branches.rs:40:21: 40:48
}
bb2: {
_5 = const false; // scope 0 at $DIR/matches_reduce_branches.rs:40:42: 40:47
goto -> bb3; // scope 0 at $DIR/matches_reduce_branches.rs:40:21: 40:48
}
bb3: {
StorageDead(_6); // scope 0 at $DIR/matches_reduce_branches.rs:40:47: 40:48
- switchInt(_5) -> [false: bb4, otherwise: bb5]; // scope 0 at $DIR/matches_reduce_branches.rs:40:18: 40:68
+ StorageLive(_8); // scope 0 at $DIR/matches_reduce_branches.rs:40:18: 40:68
+ _8 = _5; // scope 0 at $DIR/matches_reduce_branches.rs:40:18: 40:68
+ _4 = Ne(_8, const false); // scope 0 at $DIR/matches_reduce_branches.rs:40:62: 40:67
+ StorageDead(_8); // scope 0 at $DIR/matches_reduce_branches.rs:40:18: 40:68
+ goto -> bb6; // scope 0 at $DIR/matches_reduce_branches.rs:40:18: 40:68
}
bb4: {
_4 = const false; // scope 0 at $DIR/matches_reduce_branches.rs:40:62: 40:67
goto -> bb6; // scope 0 at $DIR/matches_reduce_branches.rs:40:18: 40:68
}
bb5: {
_4 = const true; // scope 0 at $DIR/matches_reduce_branches.rs:40:50: 40:54
goto -> bb6; // scope 0 at $DIR/matches_reduce_branches.rs:40:18: 40:68
}
bb6: {
StorageDead(_5); // scope 0 at $DIR/matches_reduce_branches.rs:40:67: 40:68
- switchInt(_4) -> [false: bb7, otherwise: bb8]; // scope 0 at $DIR/matches_reduce_branches.rs:40:15: 40:88
+ StorageLive(_9); // scope 0 at $DIR/matches_reduce_branches.rs:40:15: 40:88
+ _9 = _4; // scope 0 at $DIR/matches_reduce_branches.rs:40:15: 40:88
+ _3 = Ne(_9, const false); // scope 0 at $DIR/matches_reduce_branches.rs:40:82: 40:87
+ StorageDead(_9); // scope 0 at $DIR/matches_reduce_branches.rs:40:15: 40:88
+ goto -> bb9; // scope 0 at $DIR/matches_reduce_branches.rs:40:15: 40:88
}
bb7: {
_3 = const false; // scope 0 at $DIR/matches_reduce_branches.rs:40:82: 40:87
goto -> bb9; // scope 0 at $DIR/matches_reduce_branches.rs:40:15: 40:88
}
bb8: {
_3 = const true; // scope 0 at $DIR/matches_reduce_branches.rs:40:70: 40:74
goto -> bb9; // scope 0 at $DIR/matches_reduce_branches.rs:40:15: 40:88
}
bb9: {
StorageDead(_4); // scope 0 at $DIR/matches_reduce_branches.rs:40:87: 40:88
- switchInt(move _3) -> [false: bb11, otherwise: bb10]; // scope 0 at $DIR/matches_reduce_branches.rs:40:15: 40:88
+ StorageLive(_10); // scope 0 at $DIR/matches_reduce_branches.rs:40:15: 40:88
+ _10 = move _3; // scope 0 at $DIR/matches_reduce_branches.rs:40:15: 40:88
+ StorageDead(_3); // scope 0 at $DIR/matches_reduce_branches.rs:40:95: 40:96
+ _1 = Ne(_10, const false); // scope 0 at $DIR/matches_reduce_branches.rs:41:14: 41:19
+ StorageDead(_10); // scope 0 at $DIR/matches_reduce_branches.rs:40:15: 40:88
+ goto -> bb12; // scope 0 at $DIR/matches_reduce_branches.rs:40:15: 40:88
}
bb10: {
StorageDead(_3); // scope 0 at $DIR/matches_reduce_branches.rs:40:95: 40:96
_1 = const true; // scope 0 at $DIR/matches_reduce_branches.rs:40:92: 40:96
goto -> bb12; // scope 0 at $DIR/matches_reduce_branches.rs:39:15: 42:6
}
bb11: {
StorageDead(_3); // scope 0 at $DIR/matches_reduce_branches.rs:40:95: 40:96
_1 = const false; // scope 0 at $DIR/matches_reduce_branches.rs:41:14: 41:19
goto -> bb12; // scope 0 at $DIR/matches_reduce_branches.rs:39:15: 42:6
}
bb12: {
StorageDead(_2); // scope 0 at $DIR/matches_reduce_branches.rs:42:6: 42:7
_0 = _1; // scope 1 at $DIR/matches_reduce_branches.rs:43:5: 43:8
StorageDead(_1); // scope 0 at $DIR/matches_reduce_branches.rs:44:1: 44:2
return; // scope 0 at $DIR/matches_reduce_branches.rs:44:2: 44:2
}
}

10
src/test/mir-opt/matches_reduce_branches.rs
View file

@ -1,7 +1,7 @@
// compile-flags: -Zunsound-mir-opts
// EMIT_MIR_FOR_EACH_BIT_WIDTH
// EMIT_MIR matches_reduce_branches.foo.MatchBranchSimplification.diff
// EMIT_MIR matches_reduce_branches.bar.MatchBranchSimplification.diff
// EMIT_MIR matches_reduce_branches.match_nested_if.MatchBranchSimplification.diff
fn foo(bar: Option<()>) {
if matches!(bar, None) {
@ -35,9 +35,17 @@ fn bar(i: i32) -> (bool, bool, bool, bool) {
(a, b, c, d)
}
fn match_nested_if() -> bool {
let val = match () {
() if if if if true {true} else {false} {true} else {false} {true} else {false} => true,
_ => false,
};
val
}
fn main() {
let _ = foo(None);
let _ = foo(Some(()));
let _ = bar(0);
let _ = match_nested_if();
}

61
src/test/mir-opt/not_equal_false.opt.InstCombine.diff
View file

@ -8,61 +8,52 @@
let mut _3: isize; // in scope 0 at $DIR/not_equal_false.rs:4:17: 4:21
let mut _4: bool; // in scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
let mut _5: isize; // in scope 0 at $DIR/not_equal_false.rs:4:38: 4:45
let mut _6: isize; // in scope 0 at $DIR/not_equal_false.rs:4:17: 4:21
let mut _7: isize; // in scope 0 at $DIR/not_equal_false.rs:4:38: 4:45
let mut _8: bool; // in scope 0 at $DIR/not_equal_false.rs:4:5: 4:46
bb0: {
StorageLive(_2); // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
_3 = discriminant(_1); // scope 0 at $DIR/not_equal_false.rs:4:17: 4:21
switchInt(move _3) -> [0_isize: bb6, otherwise: bb5]; // scope 0 at $DIR/not_equal_false.rs:4:17: 4:21
StorageLive(_6); // scope 0 at $DIR/not_equal_false.rs:4:17: 4:21
_6 = move _3; // scope 0 at $DIR/not_equal_false.rs:4:17: 4:21
_2 = Eq(_6, const 0_isize); // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
StorageDead(_6); // scope 0 at $DIR/not_equal_false.rs:4:17: 4:21
goto -> bb4; // scope 0 at $DIR/not_equal_false.rs:4:17: 4:21
}
bb1: {
_0 = const true; // scope 0 at $DIR/not_equal_false.rs:4:5: 4:46
goto -> bb4; // scope 0 at $DIR/not_equal_false.rs:4:5: 4:46
goto -> bb3; // scope 0 at $DIR/not_equal_false.rs:4:5: 4:46
}
bb2: {
_0 = const false; // scope 0 at $DIR/not_equal_false.rs:4:5: 4:46
goto -> bb4; // scope 0 at $DIR/not_equal_false.rs:4:5: 4:46
StorageLive(_4); // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
_5 = discriminant(_1); // scope 0 at $DIR/not_equal_false.rs:4:38: 4:45
StorageLive(_7); // scope 0 at $DIR/not_equal_false.rs:4:38: 4:45
_7 = move _5; // scope 0 at $DIR/not_equal_false.rs:4:38: 4:45
_4 = Eq(_7, const 1_isize); // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
StorageDead(_7); // scope 0 at $DIR/not_equal_false.rs:4:38: 4:45
goto -> bb5; // scope 0 at $DIR/not_equal_false.rs:4:38: 4:45
}
bb3: {
StorageLive(_4); // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
_5 = discriminant(_1); // scope 0 at $DIR/not_equal_false.rs:4:38: 4:45
switchInt(move _5) -> [1_isize: bb9, otherwise: bb8]; // scope 0 at $DIR/not_equal_false.rs:4:38: 4:45
}
bb4: {
StorageDead(_4); // scope 0 at $DIR/not_equal_false.rs:4:45: 4:46
StorageDead(_2); // scope 0 at $DIR/not_equal_false.rs:4:45: 4:46
return; // scope 0 at $DIR/not_equal_false.rs:5:2: 5:2
}
bb4: {
switchInt(move _2) -> [false: bb2, otherwise: bb1]; // scope 0 at $DIR/not_equal_false.rs:4:5: 4:46
}
bb5: {
_2 = const false; // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
goto -> bb7; // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
}
bb6: {
_2 = const true; // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
goto -> bb7; // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
}
bb7: {
switchInt(move _2) -> [false: bb3, otherwise: bb1]; // scope 0 at $DIR/not_equal_false.rs:4:5: 4:46
}
bb8: {
_4 = const false; // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
goto -> bb10; // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
}
bb9: {
_4 = const true; // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
goto -> bb10; // scope 0 at $SRC_DIR/core/src/macros/mod.rs:LL:COL
}
bb10: {
switchInt(move _4) -> [false: bb2, otherwise: bb1]; // scope 0 at $DIR/not_equal_false.rs:4:5: 4:46
StorageLive(_8); // scope 0 at $DIR/not_equal_false.rs:4:5: 4:46
_8 = move _4; // scope 0 at $DIR/not_equal_false.rs:4:5: 4:46
- _0 = Ne(_8, const false); // scope 0 at $DIR/not_equal_false.rs:4:5: 4:46
+ _0 = _8; // scope 0 at $DIR/not_equal_false.rs:4:5: 4:46
StorageDead(_8); // scope 0 at $DIR/not_equal_false.rs:4:5: 4:46
goto -> bb3; // scope 0 at $DIR/not_equal_false.rs:4:5: 4:46
}
}