[rustc.git] / src / test / ui / mir / issue-76740-copy-propagation.rs

// Regression test for issue #76740.
// run-pass
// compile-flags: -Zmir-opt-level=4

#[derive(Copy, Clone)]
pub struct V([usize; 4]);

impl V {
    fn new() -> Self {
        V([0; 4])
    }

    #[inline(never)]
    fn check(mut self) {
        assert_eq!(self.0[0], 0);
        self.0[0] = 1;
    }
}

fn main() {
    let v = V::new();
    let mut i = 0;
    while i != 10 {
        // Copy propagation incorrectly assumed that Operand::Move does not
        // mutate the local, and used the same v for each V::check call,
        // rather than a copy.
        v.check();
        i += 1;
    }
}
Commit	Line	Data
1b1a35ee XL	1	// Regression test for issue #76740.
1b1a35ee XL	2	// run-pass
6a06907d	3	// compile-flags: -Zmir-opt-level=4
1b1a35ee XL	4
	5	#[derive(Copy, Clone)]
	6	pub struct V([usize; 4]);
	7
	8	impl V {
	9	fn new() -> Self {
	10	V([0; 4])
	11	}
	12
	13	#[inline(never)]
	14	fn check(mut self) {
	15	assert_eq!(self.0[0], 0);
	16	self.0[0] = 1;
	17	}
	18	}
	19
	20	fn main() {
	21	let v = V::new();
	22	let mut i = 0;
	23	while i != 10 {
	24	// Copy propagation incorrectly assumed that Operand::Move does not
	25	// mutate the local, and used the same v for each V::check call,
	26	// rather than a copy.
	27	v.check();
	28	i += 1;
	29	}
	30	}