50 lines
946 B
Rust
50 lines
946 B
Rust
//@ compile-flags: -Zmir-opt-level=0 -C no-prepopulate-passes -Copt-level=0
|
|
// make sure that branching on a constant does not emit a conditional
|
|
// branch or a switch
|
|
|
|
#![crate_type = "lib"]
|
|
|
|
// CHECK-LABEL: @if_bool
|
|
#[no_mangle]
|
|
pub fn if_bool() {
|
|
// CHECK-NOT: br i1
|
|
// CHECK-NOT: switch
|
|
_ = if true { 0 } else { 1 };
|
|
|
|
_ = if false { 0 } else { 1 };
|
|
}
|
|
|
|
// CHECK-LABEL: @if_constant_int_eq
|
|
#[no_mangle]
|
|
pub fn if_constant_int_eq() {
|
|
// CHECK-NOT: br i1
|
|
// CHECK-NOT: switch
|
|
let val = 0;
|
|
_ = if val == 0 { 0 } else { 1 };
|
|
|
|
// CHECK: br label %{{.+}}
|
|
_ = if val == 1 { 0 } else { 1 };
|
|
}
|
|
|
|
// CHECK-LABEL: @if_constant_match
|
|
#[no_mangle]
|
|
pub fn if_constant_match() {
|
|
// CHECK-NOT: br i1
|
|
// CHECK-NOT: switch
|
|
_ = match 1 {
|
|
1 => 2,
|
|
2 => 3,
|
|
_ => 4,
|
|
};
|
|
|
|
_ = match 1 {
|
|
2 => 3,
|
|
_ => 4,
|
|
};
|
|
|
|
_ = match -1 {
|
|
-1 => 1,
|
|
_ => 0,
|
|
}
|
|
}
|