diff options
Diffstat (limited to 'src/test/mir-opt/separate_const_switch.rs')
-rw-r--r-- | src/test/mir-opt/separate_const_switch.rs | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/src/test/mir-opt/separate_const_switch.rs b/src/test/mir-opt/separate_const_switch.rs new file mode 100644 index 000000000..5d82acf4d --- /dev/null +++ b/src/test/mir-opt/separate_const_switch.rs @@ -0,0 +1,35 @@ +#![feature(control_flow_enum)] +#![feature(try_trait_v2)] + +use std::ops::ControlFlow; + +// EMIT_MIR separate_const_switch.too_complex.SeparateConstSwitch.diff +// EMIT_MIR separate_const_switch.too_complex.ConstProp.diff +// EMIT_MIR separate_const_switch.too_complex.PreCodegen.after.mir +fn too_complex(x: Result<i32, usize>) -> Option<i32> { + // The pass should break the outer match into + // two blocks that only have one parent each. + // Parents are one of the two branches of the first + // match, so a later pass can propagate constants. + match { + match x { + Ok(v) => ControlFlow::Continue(v), + Err(r) => ControlFlow::Break(r), + } + } { + ControlFlow::Continue(v) => Some(v), + ControlFlow::Break(r) => None, + } +} + +// EMIT_MIR separate_const_switch.identity.SeparateConstSwitch.diff +// EMIT_MIR separate_const_switch.identity.ConstProp.diff +// EMIT_MIR separate_const_switch.identity.PreCodegen.after.mir +fn identity(x: Result<i32, i32>) -> Result<i32, i32> { + Ok(x?) +} + +fn main() { + too_complex(Ok(0)); + identity(Ok(0)); +} |