52 lines
1.4 KiB
Rust
52 lines
1.4 KiB
Rust
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//@ compile-flags: -Copt-level=3 -C no-prepopulate-passes
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//@ min-llvm-version: 19 (for trunc nuw)
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//@ only-x86_64 (because these discriminants are isize)
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#![crate_type = "lib"]
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// CHECK-LABEL: @option_match
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#[no_mangle]
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pub fn option_match(x: Option<i32>) -> u16 {
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// CHECK: %x = alloca [8 x i8]
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// CHECK: store i32 %0, ptr %x
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// CHECK: %[[TAG:.+]] = load i32, ptr %x
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// CHECK-SAME: !range ![[ZERO_ONE_32:[0-9]+]]
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// CHECK: %[[DISCR:.+]] = zext i32 %[[TAG]] to i64
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// CHECK: %[[COND:.+]] = trunc nuw i64 %[[DISCR]] to i1
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// CHECK: br i1 %[[COND]], label %[[TRUE:[a-z0-9]+]], label %[[FALSE:[a-z0-9]+]]
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// CHECK: [[TRUE]]:
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// CHECK: store i16 13
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// CHECK: [[FALSE]]:
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// CHECK: store i16 42
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match x {
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Some(_) => 13,
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None => 42,
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}
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}
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// CHECK-LABEL: @result_match
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#[no_mangle]
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pub fn result_match(x: Result<u64, i64>) -> u16 {
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// CHECK: %x = alloca [16 x i8]
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// CHECK: store i64 %0, ptr %x
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// CHECK: %[[DISCR:.+]] = load i64, ptr %x
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// CHECK-SAME: !range ![[ZERO_ONE_64:[0-9]+]]
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// CHECK: %[[COND:.+]] = trunc nuw i64 %[[DISCR]] to i1
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// CHECK: br i1 %[[COND]], label %[[TRUE:[a-z0-9]+]], label %[[FALSE:[a-z0-9]+]]
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// CHECK: [[TRUE]]:
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// CHECK: store i16 13
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// CHECK: [[FALSE]]:
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// CHECK: store i16 42
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match x {
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Err(_) => 13,
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Ok(_) => 42,
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}
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}
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// CHECK: ![[ZERO_ONE_32]] = !{i32 0, i32 2}
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// CHECK: ![[ZERO_ONE_64]] = !{i64 0, i64 2}
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