Rollup merge of #144875 - scottmcm:more-mir-tests, r=cjgillot

Add some pre-codegen MIR tests for debug mode

No functional changes; just some tests.

I made these for rust-lang/rust#144483, but that's going in a different direction, so I wanted to propose we just add them to help see the impact of other related changes in the future.

r? mir
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Stuart Cook 2025-08-04 14:58:09 +10:00 committed by GitHub
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//@ compile-flags: -Copt-level=0 -Zmir-opt-level=1 -Cdebuginfo=limited
// EMIT_MIR_FOR_EACH_PANIC_STRATEGY
#![crate_type = "lib"]
#[derive(PartialOrd, Ord, PartialEq, Eq)]
pub struct MultiField(char, i16);
// EMIT_MIR derived_ord_debug.{impl#0}-partial_cmp.PreCodegen.after.mir
// EMIT_MIR derived_ord_debug.{impl#1}-cmp.PreCodegen.after.mir
// CHECK-LABEL: partial_cmp(_1: &MultiField, _2: &MultiField) -> Option<std::cmp::Ordering>
// CHECK: = <char as PartialOrd>::partial_cmp(
// CHECK: = <i16 as PartialOrd>::partial_cmp(
// CHECK-LABEL: cmp(_1: &MultiField, _2: &MultiField) -> std::cmp::Ordering
// CHECK: = <char as Ord>::cmp(
// CHECK: = <i16 as Ord>::cmp(

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// MIR for `<impl at $DIR/derived_ord_debug.rs:6:10: 6:20>::partial_cmp` after PreCodegen
fn <impl at $DIR/derived_ord_debug.rs:6:10: 6:20>::partial_cmp(_1: &MultiField, _2: &MultiField) -> Option<std::cmp::Ordering> {
debug self => _1;
debug other => _2;
let mut _0: std::option::Option<std::cmp::Ordering>;
let _3: &char;
let _4: &char;
let mut _5: std::option::Option<std::cmp::Ordering>;
let mut _6: isize;
let mut _7: i8;
let _8: &i16;
let _9: &i16;
scope 1 {
debug cmp => _5;
}
bb0: {
_3 = &((*_1).0: char);
_4 = &((*_2).0: char);
_5 = <char as PartialOrd>::partial_cmp(copy _3, copy _4) -> [return: bb1, unwind unreachable];
}
bb1: {
_6 = discriminant(_5);
switchInt(move _6) -> [1: bb2, 0: bb4, otherwise: bb6];
}
bb2: {
_7 = discriminant(((_5 as Some).0: std::cmp::Ordering));
switchInt(move _7) -> [0: bb3, otherwise: bb4];
}
bb3: {
_8 = &((*_1).1: i16);
_9 = &((*_2).1: i16);
_0 = <i16 as PartialOrd>::partial_cmp(copy _8, copy _9) -> [return: bb5, unwind unreachable];
}
bb4: {
_0 = copy _5;
goto -> bb5;
}
bb5: {
return;
}
bb6: {
unreachable;
}
}

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// MIR for `<impl at $DIR/derived_ord_debug.rs:6:10: 6:20>::partial_cmp` after PreCodegen
fn <impl at $DIR/derived_ord_debug.rs:6:10: 6:20>::partial_cmp(_1: &MultiField, _2: &MultiField) -> Option<std::cmp::Ordering> {
debug self => _1;
debug other => _2;
let mut _0: std::option::Option<std::cmp::Ordering>;
let _3: &char;
let _4: &char;
let mut _5: std::option::Option<std::cmp::Ordering>;
let mut _6: isize;
let mut _7: i8;
let _8: &i16;
let _9: &i16;
scope 1 {
debug cmp => _5;
}
bb0: {
_3 = &((*_1).0: char);
_4 = &((*_2).0: char);
_5 = <char as PartialOrd>::partial_cmp(copy _3, copy _4) -> [return: bb1, unwind continue];
}
bb1: {
_6 = discriminant(_5);
switchInt(move _6) -> [1: bb2, 0: bb4, otherwise: bb6];
}
bb2: {
_7 = discriminant(((_5 as Some).0: std::cmp::Ordering));
switchInt(move _7) -> [0: bb3, otherwise: bb4];
}
bb3: {
_8 = &((*_1).1: i16);
_9 = &((*_2).1: i16);
_0 = <i16 as PartialOrd>::partial_cmp(copy _8, copy _9) -> [return: bb5, unwind continue];
}
bb4: {
_0 = copy _5;
goto -> bb5;
}
bb5: {
return;
}
bb6: {
unreachable;
}
}

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// MIR for `<impl at $DIR/derived_ord_debug.rs:6:22: 6:25>::cmp` after PreCodegen
fn <impl at $DIR/derived_ord_debug.rs:6:22: 6:25>::cmp(_1: &MultiField, _2: &MultiField) -> std::cmp::Ordering {
debug self => _1;
debug other => _2;
let mut _0: std::cmp::Ordering;
let _3: &char;
let _4: &char;
let mut _5: std::cmp::Ordering;
let mut _6: i8;
let _7: &i16;
let _8: &i16;
scope 1 {
debug cmp => _5;
}
bb0: {
_3 = &((*_1).0: char);
_4 = &((*_2).0: char);
_5 = <char as Ord>::cmp(copy _3, copy _4) -> [return: bb1, unwind unreachable];
}
bb1: {
_6 = discriminant(_5);
switchInt(move _6) -> [0: bb2, otherwise: bb3];
}
bb2: {
_7 = &((*_1).1: i16);
_8 = &((*_2).1: i16);
_0 = <i16 as Ord>::cmp(copy _7, copy _8) -> [return: bb4, unwind unreachable];
}
bb3: {
_0 = copy _5;
goto -> bb4;
}
bb4: {
return;
}
}

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// MIR for `<impl at $DIR/derived_ord_debug.rs:6:22: 6:25>::cmp` after PreCodegen
fn <impl at $DIR/derived_ord_debug.rs:6:22: 6:25>::cmp(_1: &MultiField, _2: &MultiField) -> std::cmp::Ordering {
debug self => _1;
debug other => _2;
let mut _0: std::cmp::Ordering;
let _3: &char;
let _4: &char;
let mut _5: std::cmp::Ordering;
let mut _6: i8;
let _7: &i16;
let _8: &i16;
scope 1 {
debug cmp => _5;
}
bb0: {
_3 = &((*_1).0: char);
_4 = &((*_2).0: char);
_5 = <char as Ord>::cmp(copy _3, copy _4) -> [return: bb1, unwind continue];
}
bb1: {
_6 = discriminant(_5);
switchInt(move _6) -> [0: bb2, otherwise: bb3];
}
bb2: {
_7 = &((*_1).1: i16);
_8 = &((*_2).1: i16);
_0 = <i16 as Ord>::cmp(copy _7, copy _8) -> [return: bb4, unwind continue];
}
bb3: {
_0 = copy _5;
goto -> bb4;
}
bb4: {
return;
}
}

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// MIR for `option_direct` after PreCodegen
fn option_direct(_1: Option<u32>) -> Option<u32> {
debug x => _1;
let mut _0: std::option::Option<u32>;
let mut _2: isize;
let _3: u32;
let mut _4: u32;
scope 1 {
debug x => _3;
}
bb0: {
_2 = discriminant(_1);
switchInt(move _2) -> [0: bb1, 1: bb2, otherwise: bb4];
}
bb1: {
_0 = Option::<u32>::None;
goto -> bb3;
}
bb2: {
_3 = copy ((_1 as Some).0: u32);
_4 = Not(copy _3);
_0 = Option::<u32>::Some(move _4);
goto -> bb3;
}
bb3: {
return;
}
bb4: {
unreachable;
}
}

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// MIR for `option_direct` after PreCodegen
fn option_direct(_1: Option<u32>) -> Option<u32> {
debug x => _1;
let mut _0: std::option::Option<u32>;
let mut _2: isize;
let _3: u32;
let mut _4: u32;
scope 1 {
debug x => _3;
}
bb0: {
_2 = discriminant(_1);
switchInt(move _2) -> [0: bb1, 1: bb2, otherwise: bb4];
}
bb1: {
_0 = Option::<u32>::None;
goto -> bb3;
}
bb2: {
_3 = copy ((_1 as Some).0: u32);
_4 = Not(copy _3);
_0 = Option::<u32>::Some(move _4);
goto -> bb3;
}
bb3: {
return;
}
bb4: {
unreachable;
}
}

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// MIR for `option_traits` after PreCodegen
fn option_traits(_1: Option<u32>) -> Option<u32> {
debug x => _1;
let mut _0: std::option::Option<u32>;
let mut _2: std::ops::ControlFlow<std::option::Option<std::convert::Infallible>, u32>;
let mut _3: isize;
let _4: u32;
let mut _5: u32;
scope 1 {
debug residual => const Option::<Infallible>::None;
scope 2 {
}
}
scope 3 {
debug val => _4;
scope 4 {
}
}
bb0: {
_2 = <Option<u32> as Try>::branch(copy _1) -> [return: bb1, unwind unreachable];
}
bb1: {
_3 = discriminant(_2);
switchInt(move _3) -> [0: bb2, 1: bb3, otherwise: bb5];
}
bb2: {
_4 = copy ((_2 as Continue).0: u32);
_5 = Not(copy _4);
_0 = <Option<u32> as Try>::from_output(move _5) -> [return: bb4, unwind unreachable];
}
bb3: {
_0 = <Option<u32> as FromResidual<Option<Infallible>>>::from_residual(const Option::<Infallible>::None) -> [return: bb4, unwind unreachable];
}
bb4: {
return;
}
bb5: {
unreachable;
}
}

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// MIR for `option_traits` after PreCodegen
fn option_traits(_1: Option<u32>) -> Option<u32> {
debug x => _1;
let mut _0: std::option::Option<u32>;
let mut _2: std::ops::ControlFlow<std::option::Option<std::convert::Infallible>, u32>;
let mut _3: isize;
let _4: u32;
let mut _5: u32;
scope 1 {
debug residual => const Option::<Infallible>::None;
scope 2 {
}
}
scope 3 {
debug val => _4;
scope 4 {
}
}
bb0: {
_2 = <Option<u32> as Try>::branch(copy _1) -> [return: bb1, unwind continue];
}
bb1: {
_3 = discriminant(_2);
switchInt(move _3) -> [0: bb2, 1: bb3, otherwise: bb5];
}
bb2: {
_4 = copy ((_2 as Continue).0: u32);
_5 = Not(copy _4);
_0 = <Option<u32> as Try>::from_output(move _5) -> [return: bb4, unwind continue];
}
bb3: {
_0 = <Option<u32> as FromResidual<Option<Infallible>>>::from_residual(const Option::<Infallible>::None) -> [return: bb4, unwind continue];
}
bb4: {
return;
}
bb5: {
unreachable;
}
}

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//@ compile-flags: -Copt-level=0 -Zmir-opt-level=1 -Cdebuginfo=limited
//@ edition: 2024
// EMIT_MIR_FOR_EACH_PANIC_STRATEGY
#![crate_type = "lib"]
#![feature(try_blocks)]
// EMIT_MIR option_bubble_debug.option_direct.PreCodegen.after.mir
pub fn option_direct(x: Option<u32>) -> Option<u32> {
// CHECK-LABEL: fn option_direct(_1: Option<u32>) -> Option<u32>
// CHECK: = discriminant(_1);
// CHECK: [[TEMP:_.+]] = Not({{.+}});
// CHECK: _0 = Option::<u32>::Some(move [[TEMP]]);
match x {
Some(x) => Some(!x),
None => None,
}
}
// EMIT_MIR option_bubble_debug.option_traits.PreCodegen.after.mir
pub fn option_traits(x: Option<u32>) -> Option<u32> {
// CHECK-LABEL: fn option_traits(_1: Option<u32>) -> Option<u32>
// CHECK: = <Option<u32> as Try>::branch(copy _1)
// CHECK: [[TEMP:_.+]] = Not({{.+}});
// CHECK: _0 = <Option<u32> as Try>::from_output(move [[TEMP]])
try { !(x?) }
}