Closed
Description
Rust compiler (rustc 1.1.0-nightly (e539424 2015-05-14) (built 2015-05-14) fails to compile this source:
#![feature(box_patterns)]
mod test {
#[derive(Debug)]
#[derive(Clone)]
pub enum Expression {
Var(String),
Const(i64),
Add(Box<Expression>, Box<Expression>),
Mul(Box<Expression>, Box<Expression>)
}
pub use self::Expression::*;
fn simplify1(exp: &Expression) -> Expression {
match *exp {
Add(box Const(0), ref n) | Add(ref n, box Const(0)) => *n.clone(),
Mul(box Const(1), ref n) | Mul(ref n, box Const(1)) => *n.clone(),
Mul(box Const(0), _) | Mul(_, box Const(0)) => Const(0),
Add(box Const(n), box Const(m)) => Const(n + m),
Mul(box Const(n), box Const(m)) => Const(n * m),
_ => exp.clone()
}
}
pub fn simplify(exp: &Expression) -> Expression {
match *exp {
Add(ref n, ref m) => simplify1(&(Add(Box::new(simplify1(n)), Box::new(simplify1(m))))),
Mul(ref n, ref m) => simplify1(&(Add(Box::new(simplify1(n)), Box::new(simplify1(m))))),
_ => exp.clone()
}
}
}
fn main() {
use test::*;
let e = Add(Box::new(Const(1)), Box::new(Const(29)));
let e1 = simplify(&e);
println!("{:?}", e1);
}With the error:
Instruction does not dominate all uses!
%10 = load %"test::Expression"** %2, align 8, !nonnull !0
%96 = bitcast %"test::Expression"* %10 to i8*
Instruction does not dominate all uses!
%91 = load %"test::Expression"** %3, align 8, !nonnull !0
%99 = bitcast %"test::Expression"* %91 to i8*
Instruction does not dominate all uses!
%10 = load %"test::Expression"** %2, align 8, !nonnull !0
%100 = bitcast %"test::Expression"* %10 to i8*
Instruction does not dominate all uses!
%91 = load %"test::Expression"** %3, align 8, !nonnull !0
%102 = bitcast %"test::Expression"* %91 to i8*
Instruction does not dominate all uses!
%10 = load %"test::Expression"** %2, align 8, !nonnull !0
%103 = bitcast %"test::Expression"* %10 to i8*
LLVM ERROR: Broken function found, compilation aborted!
I can reproduce this ICE also on play.rust-lang.org