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61 lines
1.5 KiB
Rust
61 lines
1.5 KiB
Rust
//@ compile-flags: -C no-prepopulate-passes -O
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#![crate_type = "lib"]
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pub enum E {
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A,
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B,
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C,
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}
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// CHECK-LABEL: @exhaustive_match
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#[no_mangle]
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pub fn exhaustive_match(e: E) -> u8 {
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// CHECK: switch{{.*}}, label %[[OTHERWISE:[a-zA-Z0-9_]+]] [
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// CHECK-NEXT: i[[TY:[0-9]+]] [[DISCR:[0-9]+]], label %[[A:[a-zA-Z0-9_]+]]
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// CHECK-NEXT: i[[TY:[0-9]+]] [[DISCR:[0-9]+]], label %[[B:[a-zA-Z0-9_]+]]
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// CHECK-NEXT: i[[TY:[0-9]+]] [[DISCR:[0-9]+]], label %[[C:[a-zA-Z0-9_]+]]
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// CHECK-NEXT: ]
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// CHECK: [[OTHERWISE]]:
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// CHECK-NEXT: unreachable
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//
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// CHECK: [[A]]:
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// CHECK-NEXT: store i8 0, ptr %_0, align 1
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// CHECK-NEXT: br label %[[EXIT:[a-zA-Z0-9_]+]]
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// CHECK: [[B]]:
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// CHECK-NEXT: store i8 1, ptr %_0, align 1
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// CHECK-NEXT: br label %[[EXIT]]
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// CHECK: [[C]]:
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// CHECK-NEXT: store i8 3, ptr %_0, align 1
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// CHECK-NEXT: br label %[[EXIT]]
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match e {
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E::A => 0,
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E::B => 1,
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E::C => 3,
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}
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}
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#[repr(u16)]
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pub enum E2 {
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A = 13,
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B = 42,
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}
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// For optimized code we produce a switch with an unreachable target as the `otherwise` so LLVM
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// knows the possible values. Compare with `tests/codegen/match-unoptimized.rs`.
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// CHECK-LABEL: @exhaustive_match_2
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#[no_mangle]
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pub fn exhaustive_match_2(e: E2) -> u8 {
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// CHECK: switch i16 %{{.+}}, label %[[UNREACH:.+]] [
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// CHECK-NEXT: i16 13,
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// CHECK-NEXT: i16 42,
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// CHECK-NEXT: ]
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// CHECK: [[UNREACH]]:
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// CHECK-NEXT: unreachable
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match e {
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E2::A => 0,
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E2::B => 1,
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}
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}
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