Hello Kamlesh, This mailing list is more-or-less dead; please consider asking your questions on https://users.rust-lang.org/.
Regards On Thu, Oct 3, 2019 at 5:37 AM kamlesh kumar <kamleshbha...@gmail.com> wrote: > why does optimization removes overflow checks? > consider below testcase > $cat test.rs > fn fibonacci(n: u32) -> u32 { > let mut f:u32 = 0; > let mut s:u32 = 1; > let mut next: u32 =f+s; > for _ in 1..n { > f = s; > s= next; > next=f+s; > } > next > } > fn main() { > println!("{}",fibonacci(100)); > } > > $rustc test.rs -C opt-level=1 > $./test > 2425370821 > > $rustc test.rs -C opt-level=0 > $./test > thread 'main' panicked at 'attempt to add with overflow', p11.rs:11:7 > note: run with `RUST_BACKTRACE=1` environment variable to display a > backtrace. > > ./Kamlesh > _______________________________________________ > Rust-dev mailing list > Rust-dev@mozilla.org > https://mail.mozilla.org/listinfo/rust-dev >
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