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//@ test-mir-pass: GVN
#![feature(custom_mir, core_intrinsics)]
use std::intrinsics::mir::*;
// EMIT_MIR gvn_overlapping.overlapping.GVN.diff
/// Check that we do not create overlapping assignments.
#[custom_mir(dialect = "runtime")]
fn overlapping(_17: Adt) {
// CHECK-LABEL: fn overlapping(
// CHECK: let mut [[PTR:.*]]: *mut Adt;
// CHECK: (*[[PTR]]) = Adt::Some(copy {{.*}});
mir! {
let _33: *mut Adt;
let _48: u32;
let _73: &Adt;
{
_33 = core::ptr::addr_of_mut!(_17);
_73 = &(*_33);
_48 = Field(Variant((*_73), 1), 0);
(*_33) = Adt::Some(_48);
Return()
}
}
}
// EMIT_MIR gvn_overlapping.stable_projection.GVN.diff
/// Check that we allow dereferences in the RHS if the LHS is a stable projection.
#[custom_mir(dialect = "runtime")]
fn stable_projection(_1: (Adt,)) {
// CHECK-LABEL: fn stable_projection(
// CHECK: let mut _2: *mut Adt;
// CHECK: let mut _4: &Adt;
// CHECK: (_1.0: Adt) = copy (*_4);
mir! {
let _2: *mut Adt;
let _3: u32;
let _4: &Adt;
{
_2 = core::ptr::addr_of_mut!(_1.0);
_4 = &(*_2);
_3 = Field(Variant((*_4), 1), 0);
_1.0 = Adt::Some(_3);
Return()
}
}
}
// EMIT_MIR gvn_overlapping.fields.GVN.diff
/// Check that we do not create assignments between different fields of the same local.
#[custom_mir(dialect = "runtime")]
fn fields(_1: (Adt, Adt)) {
// CHECK-LABEL: fn fields(
// CHECK: _2 = copy (((_1.0: Adt) as variant#1).0: u32);
// CHECK-NEXT: (_1.1: Adt) = Adt::Some(copy _2);
mir! {
let _2: u32;
{
_2 = Field(Variant(_1.0, 1), 0);
_1.1 = Adt::Some(_2);
Return()
}
}
}
fn main() {
overlapping(Adt::Some(0));
}
enum Adt {
None,
Some(u32),
}
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