rust/tests/codegen/mir-aggregate-no-alloca.rs

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//@ compile-flags: -O -C no-prepopulate-passes
#![crate_type = "lib"]
#[repr(transparent)]
struct Transparent32(u32);
// CHECK: i32 @make_transparent(i32 noundef %x)
#[no_mangle]
pub fn make_transparent(x: u32) -> Transparent32 {
// CHECK: %a = alloca i32
// CHECK: store i32 %x, ptr %a
// CHECK: %[[TEMP:.+]] = load i32, ptr %a
// CHECK: ret i32 %[[TEMP]]
let a = Transparent32(x);
a
}
// CHECK: i32 @make_closure(i32 noundef %x)
#[no_mangle]
pub fn make_closure(x: i32) -> impl Fn(i32) -> i32 {
// CHECK: %[[ALLOCA:.+]] = alloca i32
// CHECK: store i32 %x, ptr %[[ALLOCA]]
// CHECK: %[[TEMP:.+]] = load i32, ptr %[[ALLOCA]]
// CHECK: ret i32 %[[TEMP]]
move |y| x + y
}
// CHECK-LABEL: { i32, i32 } @make_2_tuple(i32 noundef %x)
#[no_mangle]
pub fn make_2_tuple(x: u32) -> (u32, u32) {
// CHECK: %pair = alloca { i32, i32 }
// CHECK: store i32
// CHECK: store i32
// CHECK: load i32
// CHECK: load i32
let pair = (x, x);
pair
}