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// unit-test: ScalarReplacementOfAggregates
// compile-flags: -Cpanic=abort
// no-prefer-dynamic
struct Tag(usize);
#[repr(C)]
struct S(Tag, Tag, Tag);
impl Drop for Tag {
#[inline(never)]
fn drop(&mut self) {}
}
// EMIT_MIR sroa.dropping.ScalarReplacementOfAggregates.diff
pub fn dropping() {
S(Tag(0), Tag(1), Tag(2)).1;
}
// EMIT_MIR sroa.enums.ScalarReplacementOfAggregates.diff
pub fn enums(a: usize) -> usize {
if let Some(a) = Some(a) { a } else { 0 }
}
// EMIT_MIR sroa.structs.ScalarReplacementOfAggregates.diff
pub fn structs(a: f32) -> f32 {
struct U {
_foo: usize,
a: f32,
}
U { _foo: 0, a }.a
}
// EMIT_MIR sroa.unions.ScalarReplacementOfAggregates.diff
pub fn unions(a: f32) -> u32 {
union Repr {
f: f32,
u: u32,
}
unsafe { Repr { f: a }.u }
}
struct Foo {
a: u8,
b: (),
c: &'static str,
d: Option<isize>,
}
fn g() -> u32 {
3
}
// EMIT_MIR sroa.flat.ScalarReplacementOfAggregates.diff
pub fn flat() {
let Foo { a, b, c, d } = Foo { a: 5, b: (), c: "a", d: Some(-4) };
let _ = a;
let _ = b;
let _ = c;
let _ = d;
}
#[repr(C)]
struct Escaping {
a: u32,
b: u32,
c: u32,
}
fn f(a: *const u32) {
println!("{}", unsafe { *a.add(2) });
}
// EMIT_MIR sroa.escaping.ScalarReplacementOfAggregates.diff
pub fn escaping() {
// Verify this struct is not flattened.
f(&Escaping { a: 1, b: 2, c: g() }.a);
}
fn main() {
dropping();
enums(5);
structs(5.);
unions(5.);
flat();
escaping();
}
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