66 lines
1.9 KiB
Rust
66 lines
1.9 KiB
Rust
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// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![feature(test)]
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extern crate test;
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use std::f64::{NAN, NEG_INFINITY, INFINITY, MAX};
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use std::mem::size_of;
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use test::black_box;
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// Ensure the const-eval result and runtime result of float comparison are equivalent.
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macro_rules! compare {
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($op:tt) => {
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compare!(
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[NEG_INFINITY, -MAX, -1.0, -0.0, 0.0, 1.0, MAX, INFINITY, NAN],
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$op
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);
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};
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([$($lhs:expr),+], $op:tt) => {
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$(compare!(
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$lhs,
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$op,
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[NEG_INFINITY, -MAX, -1.0, -0.0, 0.0, 1.0, MAX, INFINITY, NAN]
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);)+
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};
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($lhs:expr, $op:tt, [$($rhs:expr),+]) => {
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$({
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// Wrap the check in its own function to reduce time needed to borrowck.
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fn check() {
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static CONST_EVAL: bool = $lhs $op $rhs;
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let runtime_eval = black_box($lhs) $op black_box($rhs);
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assert_eq!(CONST_EVAL, runtime_eval, stringify!($lhs $op $rhs));
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assert_eq!(
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size_of::<[u8; ($lhs $op $rhs) as usize]>(),
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runtime_eval as usize,
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stringify!($lhs $op $rhs (forced const eval))
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);
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}
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check();
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})+
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};
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}
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fn main() {
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assert_eq!(0.0/0.0 < 0.0/0.0, false);
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assert_eq!(0.0/0.0 > 0.0/0.0, false);
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assert_eq!(NAN < NAN, false);
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assert_eq!(NAN > NAN, false);
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compare!(==);
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compare!(!=);
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compare!(<);
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compare!(<=);
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compare!(>);
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compare!(>=);
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}
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