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[mir-opt] Allow debuginfo to be generated for a constant or a Place Prior to this commit, debuginfo was always generated by mapping a name to a Place. This has the side-effect that `SimplifyLocals` cannot remove locals that are only used for debuginfo because their other uses have been const-propagated. To allow these locals to be removed, we now allow debuginfo to point to a constant value. The `ConstProp` pass detects when debuginfo points to a local with a known constant value and replaces it with the value. This allows the later `SimplifyLocals` pass to remove the local.
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- // MIR for `main` before ConstDebugInfo
+ // MIR for `main` after ConstDebugInfo
fn main() -> () {
Remove comments from mir-opt MIR dumps
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let mut _0: ();
let _1: u8;
[mir-opt] Allow debuginfo to be generated for a constant or a Place Prior to this commit, debuginfo was always generated by mapping a name to a Place. This has the side-effect that `SimplifyLocals` cannot remove locals that are only used for debuginfo because their other uses have been const-propagated. To allow these locals to be removed, we now allow debuginfo to point to a constant value. The `ConstProp` pass detects when debuginfo points to a local with a known constant value and replaces it with the value. This allows the later `SimplifyLocals` pass to remove the local.
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scope 1 {
Remove comments from mir-opt MIR dumps
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- debug x => _1;
+ debug x => const 1_u8;
let _2: u8;
[mir-opt] Allow debuginfo to be generated for a constant or a Place Prior to this commit, debuginfo was always generated by mapping a name to a Place. This has the side-effect that `SimplifyLocals` cannot remove locals that are only used for debuginfo because their other uses have been const-propagated. To allow these locals to be removed, we now allow debuginfo to point to a constant value. The `ConstProp` pass detects when debuginfo points to a local with a known constant value and replaces it with the value. This allows the later `SimplifyLocals` pass to remove the local.
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scope 2 {
Remove comments from mir-opt MIR dumps
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- debug y => _2;
+ debug y => const 2_u8;
let _3: u8;
[mir-opt] Allow debuginfo to be generated for a constant or a Place Prior to this commit, debuginfo was always generated by mapping a name to a Place. This has the side-effect that `SimplifyLocals` cannot remove locals that are only used for debuginfo because their other uses have been const-propagated. To allow these locals to be removed, we now allow debuginfo to point to a constant value. The `ConstProp` pass detects when debuginfo points to a local with a known constant value and replaces it with the value. This allows the later `SimplifyLocals` pass to remove the local.
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scope 3 {
Remove comments from mir-opt MIR dumps
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- debug z => _3;
+ debug z => const 3_u8;
let _4: u8;
[mir-opt] Allow debuginfo to be generated for a constant or a Place Prior to this commit, debuginfo was always generated by mapping a name to a Place. This has the side-effect that `SimplifyLocals` cannot remove locals that are only used for debuginfo because their other uses have been const-propagated. To allow these locals to be removed, we now allow debuginfo to point to a constant value. The `ConstProp` pass detects when debuginfo points to a local with a known constant value and replaces it with the value. This allows the later `SimplifyLocals` pass to remove the local.
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scope 4 {
Remove comments from mir-opt MIR dumps
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- debug sum => _4;
+ debug sum => const 6_u8;
Do not remove unused definitions inside GVN.
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let _5: &str;
[mir-opt] Allow debuginfo to be generated for a constant or a Place Prior to this commit, debuginfo was always generated by mapping a name to a Place. This has the side-effect that `SimplifyLocals` cannot remove locals that are only used for debuginfo because their other uses have been const-propagated. To allow these locals to be removed, we now allow debuginfo to point to a constant value. The `ConstProp` pass detects when debuginfo points to a local with a known constant value and replaces it with the value. This allows the later `SimplifyLocals` pass to remove the local.
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scope 5 {
Do not remove unused definitions inside GVN.
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- debug s => _5;
Remove comments from mir-opt MIR dumps
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+ debug s => const "hello, world!";
Do not remove unused definitions inside GVN.
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let _8: bool;
let _9: bool;
let _10: u32;
[mir-opt] Allow debuginfo to be generated for a constant or a Place Prior to this commit, debuginfo was always generated by mapping a name to a Place. This has the side-effect that `SimplifyLocals` cannot remove locals that are only used for debuginfo because their other uses have been const-propagated. To allow these locals to be removed, we now allow debuginfo to point to a constant value. The `ConstProp` pass detects when debuginfo points to a local with a known constant value and replaces it with the value. This allows the later `SimplifyLocals` pass to remove the local.
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scope 6 {
Do not remove unused definitions inside GVN.
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- debug ((f: (bool, bool, u32)).0: bool) => _8;
- debug ((f: (bool, bool, u32)).1: bool) => _9;
- debug ((f: (bool, bool, u32)).2: u32) => _10;
Refactor how MIR represents composite debuginfo.
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+ debug ((f: (bool, bool, u32)).0: bool) => const true;
+ debug ((f: (bool, bool, u32)).1: bool) => const false;
+ debug ((f: (bool, bool, u32)).2: u32) => const 123_u32;
Do not remove unused definitions inside GVN.
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let _6: std::option::Option<u16>;
[mir-opt] Allow debuginfo to be generated for a constant or a Place Prior to this commit, debuginfo was always generated by mapping a name to a Place. This has the side-effect that `SimplifyLocals` cannot remove locals that are only used for debuginfo because their other uses have been const-propagated. To allow these locals to be removed, we now allow debuginfo to point to a constant value. The `ConstProp` pass detects when debuginfo points to a local with a known constant value and replaces it with the value. This allows the later `SimplifyLocals` pass to remove the local.
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scope 7 {
Do not remove unused definitions inside GVN.
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- debug o => _6;
Use a ConstValue instead.
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+ debug o => const Option::<u16>::Some(99_u16);
Do not remove unused definitions inside GVN.
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let _11: u32;
let _12: u32;
[mir-opt] Allow debuginfo to be generated for a constant or a Place Prior to this commit, debuginfo was always generated by mapping a name to a Place. This has the side-effect that `SimplifyLocals` cannot remove locals that are only used for debuginfo because their other uses have been const-propagated. To allow these locals to be removed, we now allow debuginfo to point to a constant value. The `ConstProp` pass detects when debuginfo points to a local with a known constant value and replaces it with the value. This allows the later `SimplifyLocals` pass to remove the local.
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scope 8 {
Do not remove unused definitions inside GVN.
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- debug ((p: Point).0: u32) => _11;
- debug ((p: Point).1: u32) => _12;
Refactor how MIR represents composite debuginfo.
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+ debug ((p: Point).0: u32) => const 32_u32;
+ debug ((p: Point).1: u32) => const 32_u32;
Do not remove unused definitions inside GVN.
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let _7: u32;
[mir-opt] Allow debuginfo to be generated for a constant or a Place Prior to this commit, debuginfo was always generated by mapping a name to a Place. This has the side-effect that `SimplifyLocals` cannot remove locals that are only used for debuginfo because their other uses have been const-propagated. To allow these locals to be removed, we now allow debuginfo to point to a constant value. The `ConstProp` pass detects when debuginfo points to a local with a known constant value and replaces it with the value. This allows the later `SimplifyLocals` pass to remove the local.
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scope 9 {
Do not remove unused definitions inside GVN.
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- debug a => _7;
Remove comments from mir-opt MIR dumps
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+ debug a => const 64_u32;
[mir-opt] Allow debuginfo to be generated for a constant or a Place Prior to this commit, debuginfo was always generated by mapping a name to a Place. This has the side-effect that `SimplifyLocals` cannot remove locals that are only used for debuginfo because their other uses have been const-propagated. To allow these locals to be removed, we now allow debuginfo to point to a constant value. The `ConstProp` pass detects when debuginfo points to a local with a known constant value and replaces it with the value. This allows the later `SimplifyLocals` pass to remove the local.
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}
}
}
}
}
}
}
}
}
bb0: {
Remove comments from mir-opt MIR dumps
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_1 = const 1_u8;
_2 = const 2_u8;
_3 = const 3_u8;
StorageLive(_4);
_4 = const 6_u8;
Do not remove unused definitions inside GVN.
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StorageLive(_5);
_5 = const "hello, world!";
StorageLive(_8);
Remove comments from mir-opt MIR dumps
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StorageLive(_9);
StorageLive(_10);
Do not remove unused definitions inside GVN.
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_8 = const true;
_9 = const false;
_10 = const 123_u32;
StorageLive(_6);
_6 = const Option::<u16>::Some(99_u16);
_11 = const 32_u32;
_12 = const 32_u32;
StorageLive(_7);
_7 = const 64_u32;
StorageDead(_7);
StorageDead(_6);
StorageDead(_8);
Remove comments from mir-opt MIR dumps
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StorageDead(_9);
Do not remove unused definitions inside GVN.
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StorageDead(_10);
StorageDead(_5);
Remove comments from mir-opt MIR dumps
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StorageDead(_4);
return;
[mir-opt] Allow debuginfo to be generated for a constant or a Place Prior to this commit, debuginfo was always generated by mapping a name to a Place. This has the side-effect that `SimplifyLocals` cannot remove locals that are only used for debuginfo because their other uses have been const-propagated. To allow these locals to be removed, we now allow debuginfo to point to a constant value. The `ConstProp` pass detects when debuginfo points to a local with a known constant value and replaces it with the value. This allows the later `SimplifyLocals` pass to remove the local.
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}
}
Use a ConstValue instead.
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ALLOC0 (size: 4, align: 2) {
01 00 63 00 │ ..c.
}