156 lines
4.1 KiB
Rust
156 lines
4.1 KiB
Rust
#![allow(overflowing_literals)]
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mod parse;
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mod rawfp;
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// Take a float literal, turn it into a string in various ways (that are all trusted
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// to be correct) and see if those strings are parsed back to the value of the literal.
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// Requires a *polymorphic literal*, i.e., one that can serve as f64 as well as f32.
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macro_rules! test_literal {
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($x: expr) => {{
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let x32: f32 = $x;
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let x64: f64 = $x;
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let inputs = &[stringify!($x).into(), format!("{:?}", x64), format!("{:e}", x64)];
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for input in inputs {
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assert_eq!(input.parse(), Ok(x64));
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assert_eq!(input.parse(), Ok(x32));
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let neg_input = &format!("-{}", input);
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assert_eq!(neg_input.parse(), Ok(-x64));
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assert_eq!(neg_input.parse(), Ok(-x32));
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}
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}};
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}
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#[cfg_attr(all(target_arch = "wasm32", target_os = "emscripten"), ignore)] // issue 42630
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#[test]
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fn ordinary() {
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test_literal!(1.0);
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test_literal!(3e-5);
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test_literal!(0.1);
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test_literal!(12345.);
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test_literal!(0.9999999);
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if cfg!(miri) {
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// Miri is too slow
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return;
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}
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test_literal!(2.2250738585072014e-308);
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}
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#[cfg_attr(all(target_arch = "wasm32", target_os = "emscripten"), ignore)] // issue 42630
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#[test]
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fn special_code_paths() {
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test_literal!(36893488147419103229.0); // 2^65 - 3, triggers half-to-even with even significand
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test_literal!(101e-33); // Triggers the tricky underflow case in AlgorithmM (for f32)
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test_literal!(1e23); // Triggers AlgorithmR
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test_literal!(2075e23); // Triggers another path through AlgorithmR
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test_literal!(8713e-23); // ... and yet another.
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}
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#[test]
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fn large() {
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test_literal!(1e300);
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test_literal!(123456789.34567e250);
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test_literal!(943794359898089732078308743689303290943794359843568973207830874368930329.);
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}
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#[test]
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#[cfg_attr(miri, ignore)] // Miri is too slow
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fn subnormals() {
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test_literal!(5e-324);
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test_literal!(91e-324);
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test_literal!(1e-322);
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test_literal!(13245643e-320);
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test_literal!(2.22507385851e-308);
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test_literal!(2.1e-308);
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test_literal!(4.9406564584124654e-324);
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}
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#[test]
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#[cfg_attr(miri, ignore)] // Miri is too slow
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fn infinity() {
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test_literal!(1e400);
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test_literal!(1e309);
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test_literal!(2e308);
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test_literal!(1.7976931348624e308);
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}
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#[test]
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fn zero() {
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test_literal!(0.0);
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test_literal!(1e-325);
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if cfg!(miri) {
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// Miri is too slow
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return;
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}
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test_literal!(1e-326);
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test_literal!(1e-500);
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}
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#[test]
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fn fast_path_correct() {
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// This number triggers the fast path and is handled incorrectly when compiling on
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// x86 without SSE2 (i.e., using the x87 FPU stack).
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test_literal!(1.448997445238699);
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}
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#[test]
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fn lonely_dot() {
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assert!(".".parse::<f32>().is_err());
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assert!(".".parse::<f64>().is_err());
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}
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#[test]
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fn exponentiated_dot() {
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assert!(".e0".parse::<f32>().is_err());
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assert!(".e0".parse::<f64>().is_err());
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}
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#[test]
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fn lonely_sign() {
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assert!("+".parse::<f32>().is_err());
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assert!("-".parse::<f64>().is_err());
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}
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#[test]
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fn whitespace() {
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assert!(" 1.0".parse::<f32>().is_err());
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assert!("1.0 ".parse::<f64>().is_err());
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}
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#[test]
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fn nan() {
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assert!("NaN".parse::<f32>().unwrap().is_nan());
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assert!("NaN".parse::<f64>().unwrap().is_nan());
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}
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#[test]
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fn inf() {
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assert_eq!("inf".parse(), Ok(f64::INFINITY));
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assert_eq!("-inf".parse(), Ok(f64::NEG_INFINITY));
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assert_eq!("inf".parse(), Ok(f32::INFINITY));
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assert_eq!("-inf".parse(), Ok(f32::NEG_INFINITY));
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}
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#[test]
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fn massive_exponent() {
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let max = i64::MAX;
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assert_eq!(format!("1e{}000", max).parse(), Ok(f64::INFINITY));
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assert_eq!(format!("1e-{}000", max).parse(), Ok(0.0));
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assert_eq!(format!("1e{}000", max).parse(), Ok(f64::INFINITY));
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}
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#[test]
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fn borderline_overflow() {
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let mut s = "0.".to_string();
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for _ in 0..375 {
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s.push('3');
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}
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// At the time of this writing, this returns Err(..), but this is a bug that should be fixed.
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// It makes no sense to enshrine that in a test, the important part is that it doesn't panic.
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let _ = s.parse::<f64>();
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}
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