mirror of https://github.com/rust-lang/rust
67 lines
1.7 KiB
Rust
67 lines
1.7 KiB
Rust
// skip-filecheck
|
|
//@ test-mir-pass: SimplifyComparisonIntegral
|
|
// EMIT_MIR if_condition_int.opt_u32.SimplifyComparisonIntegral.diff
|
|
// EMIT_MIR if_condition_int.opt_negative.SimplifyComparisonIntegral.diff
|
|
// EMIT_MIR if_condition_int.opt_char.SimplifyComparisonIntegral.diff
|
|
// EMIT_MIR if_condition_int.opt_i8.SimplifyComparisonIntegral.diff
|
|
// EMIT_MIR if_condition_int.dont_opt_bool.SimplifyComparisonIntegral.diff
|
|
// EMIT_MIR if_condition_int.opt_multiple_ifs.SimplifyComparisonIntegral.diff
|
|
// EMIT_MIR if_condition_int.dont_remove_comparison.SimplifyComparisonIntegral.diff
|
|
// EMIT_MIR if_condition_int.dont_opt_floats.SimplifyComparisonIntegral.diff
|
|
|
|
fn opt_u32(x: u32) -> u32 {
|
|
if x == 42 { 0 } else { 1 }
|
|
}
|
|
|
|
// don't opt: it is already optimal to switch on the bool
|
|
fn dont_opt_bool(x: bool) -> u32 {
|
|
if x { 0 } else { 1 }
|
|
}
|
|
|
|
fn opt_char(x: char) -> u32 {
|
|
if x == 'x' { 0 } else { 1 }
|
|
}
|
|
|
|
fn opt_i8(x: i8) -> u32 {
|
|
if x == 42 { 0 } else { 1 }
|
|
}
|
|
|
|
fn opt_negative(x: i32) -> u32 {
|
|
if x == -42 { 0 } else { 1 }
|
|
}
|
|
|
|
fn opt_multiple_ifs(x: u32) -> u32 {
|
|
if x == 42 {
|
|
0
|
|
} else if x != 21 {
|
|
1
|
|
} else {
|
|
2
|
|
}
|
|
}
|
|
|
|
// test that we optimize, but do not remove the b statement, as that is used later on
|
|
fn dont_remove_comparison(a: i8) -> i32 {
|
|
let b = a == 17;
|
|
match b {
|
|
false => 10 + b as i32,
|
|
true => 100 + b as i32,
|
|
}
|
|
}
|
|
|
|
// test that we do not optimize on floats
|
|
fn dont_opt_floats(a: f32) -> i32 {
|
|
if a == -42.0 { 0 } else { 1 }
|
|
}
|
|
|
|
fn main() {
|
|
opt_u32(0);
|
|
opt_char('0');
|
|
opt_i8(22);
|
|
dont_opt_bool(false);
|
|
opt_negative(0);
|
|
opt_multiple_ifs(0);
|
|
dont_remove_comparison(11);
|
|
dont_opt_floats(1.0);
|
|
}
|