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