mirror of
https://github.com/rust-lang/rust
synced 2024-10-01 22:34:35 +00:00
92 lines
2.4 KiB
Rust
92 lines
2.4 KiB
Rust
// compile-flags: -Zmir-opt-level=0
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// run-pass
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#![feature(const_float_bits_conv)]
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#![feature(const_float_classify)]
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#![feature(const_trait_impl)]
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// Don't promote
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const fn nop<T>(x: T) -> T { x }
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// FIXME(const-hack): replace with PartialEq
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#[const_trait]
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trait MyEq<T> {
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fn eq(self, b: T) -> bool;
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}
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impl const MyEq<bool> for bool {
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fn eq(self, b: bool) -> bool {
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self == b
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}
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}
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impl const MyEq<NonDet> for bool {
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fn eq(self, _: NonDet) -> bool {
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true
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}
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}
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const fn eq<A: ~const MyEq<B>, B>(x: A, y: B) -> bool {
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x.eq(y)
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}
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macro_rules! const_assert {
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($a:expr, $b:expr) => {
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{
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const _: () = assert!(eq($a, $b));
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assert!(eq(nop($a), nop($b)));
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}
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};
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}
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macro_rules! suite {
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( $( $tt:tt )* ) => {
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fn f32() {
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suite_inner!(f32 $($tt)*);
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}
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fn f64() {
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suite_inner!(f64 $($tt)*);
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}
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}
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}
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macro_rules! suite_inner {
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(
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$ty:ident [$( $fn:ident ),*]
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$val:expr => [$($out:ident),*]
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$( $tail:tt )*
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) => {
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$( const_assert!($ty::$fn($val), $out); )*
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suite_inner!($ty [$($fn),*] $($tail)*)
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};
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( $ty:ident [$( $fn:ident ),*]) => {};
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}
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#[derive(Debug)]
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struct NonDet;
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// The result of the `is_sign` methods are not checked for correctness, since LLVM does not
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// guarantee anything about the signedness of NaNs. See
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// https://github.com/rust-lang/rust/issues/55131.
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suite! {
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[is_nan, is_infinite, is_finite, is_normal, is_sign_positive, is_sign_negative]
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-0.0 / 0.0 => [ true, false, false, false, NonDet, NonDet]
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0.0 / 0.0 => [ true, false, false, false, NonDet, NonDet]
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1.0 => [ false, false, true, true, true, false]
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-1.0 => [ false, false, true, true, false, true]
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0.0 => [ false, false, true, false, true, false]
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-0.0 => [ false, false, true, false, false, true]
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1.0 / 0.0 => [ false, true, false, false, true, false]
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-1.0 / 0.0 => [ false, true, false, false, false, true]
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}
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fn main() {
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f32();
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f64();
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}
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