Hello Kamlesh,
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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
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