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Add a codegen test to confirm this fixes 73258

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This commit is contained in:
Scott McMurray 2023-03-12 13:23:22 -07:00
parent 0b96fee343
commit 1f70bb8c43
1 changed files with 38 additions and 0 deletions
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38
tests/codegen/issues/issue-73258.rs Normal file
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// compile-flags: -O
// ignore-debug (the extra assertions get in the way)
#![crate_type = "lib"]
// Adapted from <https://github.com/rust-lang/rust/issues/73258#issue-637346014>
#[derive(Clone, Copy)]
#[repr(u8)]
pub enum Foo {
A, B, C, D,
}
// CHECK-LABEL: @issue_73258(
#[no_mangle]
pub unsafe fn issue_73258(ptr: *const Foo) -> Foo {
// CHECK-NOT: icmp
// CHECK-NOT: call
// CHECK-NOT: br
// CHECK-NOT: select
// CHECK: %[[R:.+]] = load i8
// CHECK-SAME: !range !
// CHECK-NOT: icmp
// CHECK-NOT: call
// CHECK-NOT: br
// CHECK-NOT: select
// CHECK: ret i8 %[[R]]
// CHECK-NOT: icmp
// CHECK-NOT: call
// CHECK-NOT: br
// CHECK-NOT: select
let k: Option<Foo> = Some(ptr.read());
return k.unwrap();
}