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//@ min-llvm-version: 21
//@ compile-flags: -Copt-level=3 -Zmerge-functions=disabled
//! Tests that matching + eq on `Option<FieldlessEnum>` produces a simple compare with no branching
#![crate_type = "lib"]
#[derive(PartialEq)]
pub enum TwoNum {
A,
B,
}
#[derive(PartialEq)]
pub enum ThreeNum {
A,
B,
C,
}
// CHECK-LABEL: @match_two
#[no_mangle]
pub fn match_two(a: Option<TwoNum>, b: Option<TwoNum>) -> bool {
// CHECK-NEXT: start:
// CHECK-NEXT: icmp eq i8
// CHECK-NEXT: ret
match (a, b) {
(Some(x), Some(y)) => x == y,
(Some(_), None) => false,
(None, Some(_)) => false,
(None, None) => true,
}
}
// CHECK-LABEL: @match_three
#[no_mangle]
pub fn match_three(a: Option<ThreeNum>, b: Option<ThreeNum>) -> bool {
// CHECK-NEXT: start:
// CHECK-NEXT: icmp eq
// CHECK-NEXT: ret
match (a, b) {
(Some(x), Some(y)) => x == y,
(Some(_), None) => false,
(None, Some(_)) => false,
(None, None) => true,
}
}
// CHECK-LABEL: @match_two_ref
#[no_mangle]
pub fn match_two_ref(a: &Option<TwoNum>, b: &Option<TwoNum>) -> bool {
// CHECK-NEXT: start:
// CHECK-NEXT: load i8
// CHECK-NEXT: load i8
// CHECK-NEXT: icmp eq i8
// CHECK-NEXT: ret
match (a, b) {
(Some(x), Some(y)) => x == y,
(Some(_), None) => false,
(None, Some(_)) => false,
(None, None) => true,
}
}
// CHECK-LABEL: @match_three_ref
#[no_mangle]
pub fn match_three_ref(a: &Option<ThreeNum>, b: &Option<ThreeNum>) -> bool {
// CHECK-NEXT: start:
// CHECK-NEXT: load i8
// CHECK-NEXT: load i8
// CHECK-NEXT: icmp eq
// CHECK-NEXT: ret
match (a, b) {
(Some(x), Some(y)) => x == y,
(Some(_), None) => false,
(None, Some(_)) => false,
(None, None) => true,
}
}
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