Rust programs crash when dividing by zero

[jruderman]

fn main() {
    let y = 0;
    assert 1 / y != 0;
}

SIGFPE / Floating point exception

Is this the intended behavior?

[jruderman]

Task failure would be friendlier.

[mbrubeck]

Rust uses the LLVM sdiv and udiv instructions for integer division, which have undefined results for division by zero. Using the current Rust compiler built from master on my 32-bit Linux machine, fn main() { log_err 1/0 } prints 0 when compiled with optimization. When compiled without optimization, it yields different results each time it is executed, for example 139268064.

I'm kind of suprised by both of these results; I'd have expected a hardware exception like the one that jruderman reported. Does clang do anything different for integer division? See this thread for some discussion (but no current solutions) from the LLVM point of view.

[graydon]

Should trap SIGFPE and route to failure. Runtime issue.