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Diffstat (limited to 'tests/codegen/issues/issue-77812.rs')
-rw-r--r-- | tests/codegen/issues/issue-77812.rs | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/tests/codegen/issues/issue-77812.rs b/tests/codegen/issues/issue-77812.rs new file mode 100644 index 000000000..4cc824145 --- /dev/null +++ b/tests/codegen/issues/issue-77812.rs @@ -0,0 +1,32 @@ +// compile-flags: -O +#![crate_type = "lib"] + +// Test that LLVM can eliminate the unreachable `Variant::Zero` branch. + +#[derive(Copy, Clone, Eq, PartialEq)] +pub enum Variant { + Zero, + One, + Two, +} + +extern { + fn exf1(); + fn exf2(); +} + +pub static mut GLOBAL: Variant = Variant::Zero; + +// CHECK-LABEL: @issue_77812 +#[no_mangle] +pub unsafe fn issue_77812() { + let g = GLOBAL; + if g != Variant::Zero { + match g { + Variant::One => exf1(), + Variant::Two => exf2(), + // CHECK-NOT: panic + Variant::Zero => panic!(), + } + } +} |