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//@ compile-flags: -Zmir-opt-level=0 -Znext-solver
//@ run-pass
// ignore-tidy-linelength
// This tests the float classification functions, for regular runtime code and for const evaluation.
#![feature(f16_const)]
#![feature(f128_const)]
#![feature(const_float_classify)]
use std::hint::black_box;
use std::num::FpCategory::*;
macro_rules! both_assert {
($a:expr, NonDet) => {
{
// Compute `a`, but do not compare with anything as the result is non-deterministic.
const _: () = { let _val = $a; };
// `black_box` prevents promotion, and MIR opts are disabled above, so this is truly
// going through LLVM.
let _val = black_box($a);
}
};
($a:expr, $b:ident) => {
{
const _: () = assert!(matches!($a, $b));
assert!(black_box($a) == black_box($b));
}
};
}
macro_rules! suite {
( $tyname:ident: $( $tt:tt )* ) => {
fn f32() {
type $tyname = f32;
suite_inner!(f32 $($tt)*);
}
fn f64() {
type $tyname = f64;
suite_inner!(f64 $($tt)*);
}
}
}
macro_rules! suite_inner {
(
$ty:ident [$( $fn:ident ),*]
$val:expr => [$($out:ident),*]
$( $tail:tt )*
) => {
$( both_assert!($ty::$fn($val), $out); )*
suite_inner!($ty [$($fn),*] $($tail)*)
};
( $ty:ident [$( $fn:ident ),*]) => {};
}
// The result of the `is_sign` methods are not checked for correctness, since we do not
// guarantee anything about the signedness of NaNs. See
// https://rust-lang.github.io/rfcs/3514-float-semantics.html.
suite! { T: // type alias for the type we are testing
[ classify, is_nan, is_infinite, is_finite, is_normal, is_sign_positive, is_sign_negative]
-0.0 / 0.0 => [ Nan, true, false, false, false, NonDet, NonDet]
0.0 / 0.0 => [ Nan, true, false, false, false, NonDet, NonDet]
1.0 => [ Normal, false, false, true, true, true, false]
-1.0 => [ Normal, false, false, true, true, false, true]
0.0 => [ Zero, false, false, true, false, true, false]
-0.0 => [ Zero, false, false, true, false, false, true]
1.0 / 0.0 => [ Infinite, false, true, false, false, true, false]
-1.0 / 0.0 => [ Infinite, false, true, false, false, false, true]
1.0 / T::MAX => [Subnormal, false, false, true, false, true, false]
-1.0 / T::MAX => [Subnormal, false, false, true, false, false, true]
}
fn main() {
f32();
f64();
// FIXME(f16_f128): also test f16 and f128
}
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