mirror of https://github.com/rust-lang/rust
68 lines
1.1 KiB
Rust
68 lines
1.1 KiB
Rust
//@ compile-flags: -Zmir-opt-level=0 -C no-prepopulate-passes -Copt-level=0
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// make sure that branching on a constant does not emit a conditional
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// branch or a switch
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#![crate_type = "lib"]
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// CHECK-LABEL: @if_bool
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#[no_mangle]
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pub fn if_bool() {
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// CHECK: br label %{{.+}}
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_ = if true {
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0
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} else {
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1
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};
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// CHECK: br label %{{.+}}
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_ = if false {
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0
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} else {
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1
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};
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}
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// CHECK-LABEL: @if_constant_int_eq
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#[no_mangle]
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pub fn if_constant_int_eq() {
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let val = 0;
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// CHECK: br label %{{.+}}
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_ = if val == 0 {
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0
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} else {
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1
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};
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// CHECK: br label %{{.+}}
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_ = if val == 1 {
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0
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} else {
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1
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};
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}
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// CHECK-LABEL: @if_constant_match
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#[no_mangle]
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pub fn if_constant_match() {
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// CHECK: br label %{{.+}}
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_ = match 1 {
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1 => 2,
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2 => 3,
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_ => 4
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};
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// CHECK: br label %{{.+}}
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_ = match 1 {
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2 => 3,
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_ => 4
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};
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// CHECK: br label %[[MINUS1:.+]]
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_ = match -1 {
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// CHECK: [[MINUS1]]:
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// CHECK: store i32 1
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-1 => 1,
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_ => 0,
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}
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}
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