1 // Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 //! This module provides constants which are specific to the implementation
12 //! of the `f32` floating point data type.
14 //! *[See also the `f32` primitive type](../../std/primitive.f32.html).*
16 //! Mathematically significant numbers are provided in the `consts` sub-module.
18 #![stable(feature = "rust1", since = "1.0.0")]
19 #![allow(missing_docs)]
26 #[stable(feature = "rust1", since = "1.0.0")]
27 pub use core::f32::{RADIX, MANTISSA_DIGITS, DIGITS, EPSILON};
28 #[stable(feature = "rust1", since = "1.0.0")]
29 pub use core::f32::{MIN_EXP, MAX_EXP, MIN_10_EXP};
30 #[stable(feature = "rust1", since = "1.0.0")]
31 pub use core::f32::{MAX_10_EXP, NAN, INFINITY, NEG_INFINITY};
32 #[stable(feature = "rust1", since = "1.0.0")]
33 pub use core::f32::{MIN, MIN_POSITIVE, MAX};
34 #[stable(feature = "rust1", since = "1.0.0")]
35 pub use core::f32::consts;
38 #[lang = "f32_runtime"]
40 /// Returns the largest integer less than or equal to a number.
48 /// assert_eq!(f.floor(), 3.0);
49 /// assert_eq!(g.floor(), 3.0);
51 #[stable(feature = "rust1", since = "1.0.0")]
53 pub fn floor(self) -> f32 {
54 // On MSVC LLVM will lower many math intrinsics to a call to the
55 // corresponding function. On MSVC, however, many of these functions
56 // aren't actually available as symbols to call, but rather they are all
57 // `static inline` functions in header files. This means that from a C
58 // perspective it's "compatible", but not so much from an ABI
59 // perspective (which we're worried about).
61 // The inline header functions always just cast to a f64 and do their
62 // operation, so we do that here as well, but only for MSVC targets.
64 // Note that there are many MSVC-specific float operations which
65 // redirect to this comment, so `floorf` is just one case of a missing
66 // function on MSVC, but there are many others elsewhere.
67 #[cfg(target_env = "msvc")]
68 return (self as f64).floor() as f32;
69 #[cfg(not(target_env = "msvc"))]
70 return unsafe { intrinsics::floorf32(self) };
73 /// Returns the smallest integer greater than or equal to a number.
81 /// assert_eq!(f.ceil(), 4.0);
82 /// assert_eq!(g.ceil(), 4.0);
84 #[stable(feature = "rust1", since = "1.0.0")]
86 pub fn ceil(self) -> f32 {
87 // see notes above in `floor`
88 #[cfg(target_env = "msvc")]
89 return (self as f64).ceil() as f32;
90 #[cfg(not(target_env = "msvc"))]
91 return unsafe { intrinsics::ceilf32(self) };
94 /// Returns the nearest integer to a number. Round half-way cases away from
101 /// let g = -3.3_f32;
103 /// assert_eq!(f.round(), 3.0);
104 /// assert_eq!(g.round(), -3.0);
106 #[stable(feature = "rust1", since = "1.0.0")]
108 pub fn round(self) -> f32 {
109 unsafe { intrinsics::roundf32(self) }
112 /// Returns the integer part of a number.
118 /// let g = -3.7_f32;
120 /// assert_eq!(f.trunc(), 3.0);
121 /// assert_eq!(g.trunc(), -3.0);
123 #[stable(feature = "rust1", since = "1.0.0")]
125 pub fn trunc(self) -> f32 {
126 unsafe { intrinsics::truncf32(self) }
129 /// Returns the fractional part of a number.
137 /// let y = -3.5_f32;
138 /// let abs_difference_x = (x.fract() - 0.5).abs();
139 /// let abs_difference_y = (y.fract() - (-0.5)).abs();
141 /// assert!(abs_difference_x <= f32::EPSILON);
142 /// assert!(abs_difference_y <= f32::EPSILON);
144 #[stable(feature = "rust1", since = "1.0.0")]
146 pub fn fract(self) -> f32 { self - self.trunc() }
148 /// Computes the absolute value of `self`. Returns `NAN` if the
157 /// let y = -3.5_f32;
159 /// let abs_difference_x = (x.abs() - x).abs();
160 /// let abs_difference_y = (y.abs() - (-y)).abs();
162 /// assert!(abs_difference_x <= f32::EPSILON);
163 /// assert!(abs_difference_y <= f32::EPSILON);
165 /// assert!(f32::NAN.abs().is_nan());
167 #[stable(feature = "rust1", since = "1.0.0")]
169 pub fn abs(self) -> f32 {
170 unsafe { intrinsics::fabsf32(self) }
173 /// Returns a number that represents the sign of `self`.
175 /// - `1.0` if the number is positive, `+0.0` or `INFINITY`
176 /// - `-1.0` if the number is negative, `-0.0` or `NEG_INFINITY`
177 /// - `NAN` if the number is `NAN`
186 /// assert_eq!(f.signum(), 1.0);
187 /// assert_eq!(f32::NEG_INFINITY.signum(), -1.0);
189 /// assert!(f32::NAN.signum().is_nan());
191 #[stable(feature = "rust1", since = "1.0.0")]
193 pub fn signum(self) -> f32 {
197 unsafe { intrinsics::copysignf32(1.0, self) }
201 /// Returns a number composed of the magnitude of one number and the sign of
204 /// Equal to `self` if the sign of `self` and `y` are the same, otherwise
205 /// equal to `-y`. If `self` is a `NAN`, then a `NAN` with the sign of `y`
211 /// #![feature(copysign)]
216 /// assert_eq!(f.copysign(0.42), 3.5_f32);
217 /// assert_eq!(f.copysign(-0.42), -3.5_f32);
218 /// assert_eq!((-f).copysign(0.42), 3.5_f32);
219 /// assert_eq!((-f).copysign(-0.42), -3.5_f32);
221 /// assert!(f32::NAN.copysign(1.0).is_nan());
224 #[unstable(feature="copysign", issue="0")]
225 pub fn copysign(self, y: f32) -> f32 {
226 unsafe { intrinsics::copysignf32(self, y) }
229 /// Fused multiply-add. Computes `(self * a) + b` with only one rounding
230 /// error, yielding a more accurate result than an unfused multiply-add.
232 /// Using `mul_add` can be more performant than an unfused multiply-add if
233 /// the target architecture has a dedicated `fma` CPU instruction.
240 /// let m = 10.0_f32;
242 /// let b = 60.0_f32;
245 /// let abs_difference = (m.mul_add(x, b) - (m*x + b)).abs();
247 /// assert!(abs_difference <= f32::EPSILON);
249 #[stable(feature = "rust1", since = "1.0.0")]
251 pub fn mul_add(self, a: f32, b: f32) -> f32 {
252 unsafe { intrinsics::fmaf32(self, a, b) }
255 /// Calculates Euclidean division, the matching method for `mod_euc`.
257 /// This computes the integer `n` such that
258 /// `self = n * rhs + self.mod_euc(rhs)`.
259 /// In other words, the result is `self / rhs` rounded to the integer `n`
260 /// such that `self >= n * rhs`.
265 /// #![feature(euclidean_division)]
266 /// let a: f32 = 7.0;
268 /// assert_eq!(a.div_euc(b), 1.0); // 7.0 > 4.0 * 1.0
269 /// assert_eq!((-a).div_euc(b), -2.0); // -7.0 >= 4.0 * -2.0
270 /// assert_eq!(a.div_euc(-b), -1.0); // 7.0 >= -4.0 * -1.0
271 /// assert_eq!((-a).div_euc(-b), 2.0); // -7.0 >= -4.0 * 2.0
274 #[unstable(feature = "euclidean_division", issue = "49048")]
275 pub fn div_euc(self, rhs: f32) -> f32 {
276 let q = (self / rhs).trunc();
277 if self % rhs < 0.0 {
278 return if rhs > 0.0 { q - 1.0 } else { q + 1.0 }
283 /// Calculates the Euclidean modulo (self mod rhs), which is never negative.
285 /// In particular, the return value `r` satisfies `0.0 <= r < rhs.abs()` in
286 /// most cases. However, due to a floating point round-off error it can
287 /// result in `r == rhs.abs()`, violating the mathematical definition, if
288 /// `self` is much smaller than `rhs.abs()` in magnitude and `self < 0.0`.
289 /// This result is not an element of the function's codomain, but it is the
290 /// closest floating point number in the real numbers and thus fulfills the
291 /// property `self == self.div_euc(rhs) * rhs + self.mod_euc(rhs)`
297 /// #![feature(euclidean_division)]
298 /// let a: f32 = 7.0;
300 /// assert_eq!(a.mod_euc(b), 3.0);
301 /// assert_eq!((-a).mod_euc(b), 1.0);
302 /// assert_eq!(a.mod_euc(-b), 3.0);
303 /// assert_eq!((-a).mod_euc(-b), 1.0);
304 /// // limitation due to round-off error
305 /// assert!((-std::f32::EPSILON).mod_euc(3.0) != 0.0);
308 #[unstable(feature = "euclidean_division", issue = "49048")]
309 pub fn mod_euc(self, rhs: f32) -> f32 {
319 /// Raises a number to an integer power.
321 /// Using this function is generally faster than using `powf`
329 /// let abs_difference = (x.powi(2) - x*x).abs();
331 /// assert!(abs_difference <= f32::EPSILON);
333 #[stable(feature = "rust1", since = "1.0.0")]
335 pub fn powi(self, n: i32) -> f32 {
336 unsafe { intrinsics::powif32(self, n) }
339 /// Raises a number to a floating point power.
347 /// let abs_difference = (x.powf(2.0) - x*x).abs();
349 /// assert!(abs_difference <= f32::EPSILON);
351 #[stable(feature = "rust1", since = "1.0.0")]
353 pub fn powf(self, n: f32) -> f32 {
354 // see notes above in `floor`
355 #[cfg(target_env = "msvc")]
356 return (self as f64).powf(n as f64) as f32;
357 #[cfg(not(target_env = "msvc"))]
358 return unsafe { intrinsics::powf32(self, n) };
361 /// Takes the square root of a number.
363 /// Returns NaN if `self` is a negative number.
370 /// let positive = 4.0_f32;
371 /// let negative = -4.0_f32;
373 /// let abs_difference = (positive.sqrt() - 2.0).abs();
375 /// assert!(abs_difference <= f32::EPSILON);
376 /// assert!(negative.sqrt().is_nan());
378 #[stable(feature = "rust1", since = "1.0.0")]
380 pub fn sqrt(self) -> f32 {
384 unsafe { intrinsics::sqrtf32(self) }
388 /// Returns `e^(self)`, (the exponential function).
395 /// let one = 1.0f32;
397 /// let e = one.exp();
399 /// // ln(e) - 1 == 0
400 /// let abs_difference = (e.ln() - 1.0).abs();
402 /// assert!(abs_difference <= f32::EPSILON);
404 #[stable(feature = "rust1", since = "1.0.0")]
406 pub fn exp(self) -> f32 {
407 // see notes above in `floor`
408 #[cfg(target_env = "msvc")]
409 return (self as f64).exp() as f32;
410 #[cfg(not(target_env = "msvc"))]
411 return unsafe { intrinsics::expf32(self) };
414 /// Returns `2^(self)`.
424 /// let abs_difference = (f.exp2() - 4.0).abs();
426 /// assert!(abs_difference <= f32::EPSILON);
428 #[stable(feature = "rust1", since = "1.0.0")]
430 pub fn exp2(self) -> f32 {
431 unsafe { intrinsics::exp2f32(self) }
434 /// Returns the natural logarithm of the number.
441 /// let one = 1.0f32;
443 /// let e = one.exp();
445 /// // ln(e) - 1 == 0
446 /// let abs_difference = (e.ln() - 1.0).abs();
448 /// assert!(abs_difference <= f32::EPSILON);
450 #[stable(feature = "rust1", since = "1.0.0")]
452 pub fn ln(self) -> f32 {
453 // see notes above in `floor`
454 #[cfg(target_env = "msvc")]
455 return (self as f64).ln() as f32;
456 #[cfg(not(target_env = "msvc"))]
457 return unsafe { intrinsics::logf32(self) };
460 /// Returns the logarithm of the number with respect to an arbitrary base.
462 /// The result may not be correctly rounded owing to implementation details;
463 /// `self.log2()` can produce more accurate results for base 2, and
464 /// `self.log10()` can produce more accurate results for base 10.
471 /// let five = 5.0f32;
473 /// // log5(5) - 1 == 0
474 /// let abs_difference = (five.log(5.0) - 1.0).abs();
476 /// assert!(abs_difference <= f32::EPSILON);
478 #[stable(feature = "rust1", since = "1.0.0")]
480 pub fn log(self, base: f32) -> f32 { self.ln() / base.ln() }
482 /// Returns the base 2 logarithm of the number.
489 /// let two = 2.0f32;
491 /// // log2(2) - 1 == 0
492 /// let abs_difference = (two.log2() - 1.0).abs();
494 /// assert!(abs_difference <= f32::EPSILON);
496 #[stable(feature = "rust1", since = "1.0.0")]
498 pub fn log2(self) -> f32 {
499 #[cfg(target_os = "android")]
500 return ::sys::android::log2f32(self);
501 #[cfg(not(target_os = "android"))]
502 return unsafe { intrinsics::log2f32(self) };
505 /// Returns the base 10 logarithm of the number.
512 /// let ten = 10.0f32;
514 /// // log10(10) - 1 == 0
515 /// let abs_difference = (ten.log10() - 1.0).abs();
517 /// assert!(abs_difference <= f32::EPSILON);
519 #[stable(feature = "rust1", since = "1.0.0")]
521 pub fn log10(self) -> f32 {
522 // see notes above in `floor`
523 #[cfg(target_env = "msvc")]
524 return (self as f64).log10() as f32;
525 #[cfg(not(target_env = "msvc"))]
526 return unsafe { intrinsics::log10f32(self) };
529 /// The positive difference of two numbers.
531 /// * If `self <= other`: `0:0`
532 /// * Else: `self - other`
542 /// let abs_difference_x = (x.abs_sub(1.0) - 2.0).abs();
543 /// let abs_difference_y = (y.abs_sub(1.0) - 0.0).abs();
545 /// assert!(abs_difference_x <= f32::EPSILON);
546 /// assert!(abs_difference_y <= f32::EPSILON);
548 #[stable(feature = "rust1", since = "1.0.0")]
550 #[rustc_deprecated(since = "1.10.0",
551 reason = "you probably meant `(self - other).abs()`: \
552 this operation is `(self - other).max(0.0)` (also \
553 known as `fdimf` in C). If you truly need the positive \
554 difference, consider using that expression or the C function \
555 `fdimf`, depending on how you wish to handle NaN (please consider \
556 filing an issue describing your use-case too).")]
557 pub fn abs_sub(self, other: f32) -> f32 {
558 unsafe { cmath::fdimf(self, other) }
561 /// Takes the cubic root of a number.
570 /// // x^(1/3) - 2 == 0
571 /// let abs_difference = (x.cbrt() - 2.0).abs();
573 /// assert!(abs_difference <= f32::EPSILON);
575 #[stable(feature = "rust1", since = "1.0.0")]
577 pub fn cbrt(self) -> f32 {
578 unsafe { cmath::cbrtf(self) }
581 /// Calculates the length of the hypotenuse of a right-angle triangle given
582 /// legs of length `x` and `y`.
592 /// // sqrt(x^2 + y^2)
593 /// let abs_difference = (x.hypot(y) - (x.powi(2) + y.powi(2)).sqrt()).abs();
595 /// assert!(abs_difference <= f32::EPSILON);
597 #[stable(feature = "rust1", since = "1.0.0")]
599 pub fn hypot(self, other: f32) -> f32 {
600 unsafe { cmath::hypotf(self, other) }
603 /// Computes the sine of a number (in radians).
610 /// let x = f32::consts::PI/2.0;
612 /// let abs_difference = (x.sin() - 1.0).abs();
614 /// assert!(abs_difference <= f32::EPSILON);
616 #[stable(feature = "rust1", since = "1.0.0")]
618 pub fn sin(self) -> f32 {
619 // see notes in `core::f32::Float::floor`
620 #[cfg(target_env = "msvc")]
621 return (self as f64).sin() as f32;
622 #[cfg(not(target_env = "msvc"))]
623 return unsafe { intrinsics::sinf32(self) };
626 /// Computes the cosine of a number (in radians).
633 /// let x = 2.0*f32::consts::PI;
635 /// let abs_difference = (x.cos() - 1.0).abs();
637 /// assert!(abs_difference <= f32::EPSILON);
639 #[stable(feature = "rust1", since = "1.0.0")]
641 pub fn cos(self) -> f32 {
642 // see notes in `core::f32::Float::floor`
643 #[cfg(target_env = "msvc")]
644 return (self as f64).cos() as f32;
645 #[cfg(not(target_env = "msvc"))]
646 return unsafe { intrinsics::cosf32(self) };
649 /// Computes the tangent of a number (in radians).
656 /// let x = f32::consts::PI / 4.0;
657 /// let abs_difference = (x.tan() - 1.0).abs();
659 /// assert!(abs_difference <= f32::EPSILON);
661 #[stable(feature = "rust1", since = "1.0.0")]
663 pub fn tan(self) -> f32 {
664 unsafe { cmath::tanf(self) }
667 /// Computes the arcsine of a number. Return value is in radians in
668 /// the range [-pi/2, pi/2] or NaN if the number is outside the range
676 /// let f = f32::consts::PI / 2.0;
678 /// // asin(sin(pi/2))
679 /// let abs_difference = (f.sin().asin() - f32::consts::PI / 2.0).abs();
681 /// assert!(abs_difference <= f32::EPSILON);
683 #[stable(feature = "rust1", since = "1.0.0")]
685 pub fn asin(self) -> f32 {
686 unsafe { cmath::asinf(self) }
689 /// Computes the arccosine of a number. Return value is in radians in
690 /// the range [0, pi] or NaN if the number is outside the range
698 /// let f = f32::consts::PI / 4.0;
700 /// // acos(cos(pi/4))
701 /// let abs_difference = (f.cos().acos() - f32::consts::PI / 4.0).abs();
703 /// assert!(abs_difference <= f32::EPSILON);
705 #[stable(feature = "rust1", since = "1.0.0")]
707 pub fn acos(self) -> f32 {
708 unsafe { cmath::acosf(self) }
711 /// Computes the arctangent of a number. Return value is in radians in the
712 /// range [-pi/2, pi/2];
722 /// let abs_difference = (f.tan().atan() - 1.0).abs();
724 /// assert!(abs_difference <= f32::EPSILON);
726 #[stable(feature = "rust1", since = "1.0.0")]
728 pub fn atan(self) -> f32 {
729 unsafe { cmath::atanf(self) }
732 /// Computes the four quadrant arctangent of `self` (`y`) and `other` (`x`) in radians.
734 /// * `x = 0`, `y = 0`: `0`
735 /// * `x >= 0`: `arctan(y/x)` -> `[-pi/2, pi/2]`
736 /// * `y >= 0`: `arctan(y/x) + pi` -> `(pi/2, pi]`
737 /// * `y < 0`: `arctan(y/x) - pi` -> `(-pi, -pi/2)`
744 /// let pi = f32::consts::PI;
745 /// // Positive angles measured counter-clockwise
746 /// // from positive x axis
747 /// // -pi/4 radians (45 deg clockwise)
749 /// let y1 = -3.0f32;
751 /// // 3pi/4 radians (135 deg counter-clockwise)
752 /// let x2 = -3.0f32;
755 /// let abs_difference_1 = (y1.atan2(x1) - (-pi/4.0)).abs();
756 /// let abs_difference_2 = (y2.atan2(x2) - 3.0*pi/4.0).abs();
758 /// assert!(abs_difference_1 <= f32::EPSILON);
759 /// assert!(abs_difference_2 <= f32::EPSILON);
761 #[stable(feature = "rust1", since = "1.0.0")]
763 pub fn atan2(self, other: f32) -> f32 {
764 unsafe { cmath::atan2f(self, other) }
767 /// Simultaneously computes the sine and cosine of the number, `x`. Returns
768 /// `(sin(x), cos(x))`.
775 /// let x = f32::consts::PI/4.0;
776 /// let f = x.sin_cos();
778 /// let abs_difference_0 = (f.0 - x.sin()).abs();
779 /// let abs_difference_1 = (f.1 - x.cos()).abs();
781 /// assert!(abs_difference_0 <= f32::EPSILON);
782 /// assert!(abs_difference_1 <= f32::EPSILON);
784 #[stable(feature = "rust1", since = "1.0.0")]
786 pub fn sin_cos(self) -> (f32, f32) {
787 (self.sin(), self.cos())
790 /// Returns `e^(self) - 1` in a way that is accurate even if the
791 /// number is close to zero.
801 /// let abs_difference = (x.ln().exp_m1() - 5.0).abs();
803 /// assert!(abs_difference <= f32::EPSILON);
805 #[stable(feature = "rust1", since = "1.0.0")]
807 pub fn exp_m1(self) -> f32 {
808 unsafe { cmath::expm1f(self) }
811 /// Returns `ln(1+n)` (natural logarithm) more accurately than if
812 /// the operations were performed separately.
819 /// let x = f32::consts::E - 1.0;
821 /// // ln(1 + (e - 1)) == ln(e) == 1
822 /// let abs_difference = (x.ln_1p() - 1.0).abs();
824 /// assert!(abs_difference <= f32::EPSILON);
826 #[stable(feature = "rust1", since = "1.0.0")]
828 pub fn ln_1p(self) -> f32 {
829 unsafe { cmath::log1pf(self) }
832 /// Hyperbolic sine function.
839 /// let e = f32::consts::E;
842 /// let f = x.sinh();
843 /// // Solving sinh() at 1 gives `(e^2-1)/(2e)`
844 /// let g = (e*e - 1.0)/(2.0*e);
845 /// let abs_difference = (f - g).abs();
847 /// assert!(abs_difference <= f32::EPSILON);
849 #[stable(feature = "rust1", since = "1.0.0")]
851 pub fn sinh(self) -> f32 {
852 unsafe { cmath::sinhf(self) }
855 /// Hyperbolic cosine function.
862 /// let e = f32::consts::E;
864 /// let f = x.cosh();
865 /// // Solving cosh() at 1 gives this result
866 /// let g = (e*e + 1.0)/(2.0*e);
867 /// let abs_difference = (f - g).abs();
870 /// assert!(abs_difference <= f32::EPSILON);
872 #[stable(feature = "rust1", since = "1.0.0")]
874 pub fn cosh(self) -> f32 {
875 unsafe { cmath::coshf(self) }
878 /// Hyperbolic tangent function.
885 /// let e = f32::consts::E;
888 /// let f = x.tanh();
889 /// // Solving tanh() at 1 gives `(1 - e^(-2))/(1 + e^(-2))`
890 /// let g = (1.0 - e.powi(-2))/(1.0 + e.powi(-2));
891 /// let abs_difference = (f - g).abs();
893 /// assert!(abs_difference <= f32::EPSILON);
895 #[stable(feature = "rust1", since = "1.0.0")]
897 pub fn tanh(self) -> f32 {
898 unsafe { cmath::tanhf(self) }
901 /// Inverse hyperbolic sine function.
909 /// let f = x.sinh().asinh();
911 /// let abs_difference = (f - x).abs();
913 /// assert!(abs_difference <= f32::EPSILON);
915 #[stable(feature = "rust1", since = "1.0.0")]
917 pub fn asinh(self) -> f32 {
918 if self == NEG_INFINITY {
921 (self + ((self * self) + 1.0).sqrt()).ln()
925 /// Inverse hyperbolic cosine function.
933 /// let f = x.cosh().acosh();
935 /// let abs_difference = (f - x).abs();
937 /// assert!(abs_difference <= f32::EPSILON);
939 #[stable(feature = "rust1", since = "1.0.0")]
941 pub fn acosh(self) -> f32 {
943 x if x < 1.0 => ::f32::NAN,
944 x => (x + ((x * x) - 1.0).sqrt()).ln(),
948 /// Inverse hyperbolic tangent function.
955 /// let e = f32::consts::E;
956 /// let f = e.tanh().atanh();
958 /// let abs_difference = (f - e).abs();
960 /// assert!(abs_difference <= 1e-5);
962 #[stable(feature = "rust1", since = "1.0.0")]
964 pub fn atanh(self) -> f32 {
965 0.5 * ((2.0 * self) / (1.0 - self)).ln_1p()
974 use num::FpCategory as Fp;
978 test_num(10f32, 2f32);
983 assert_eq!(NAN.min(2.0), 2.0);
984 assert_eq!(2.0f32.min(NAN), 2.0);
989 assert_eq!(NAN.max(2.0), 2.0);
990 assert_eq!(2.0f32.max(NAN), 2.0);
995 let nan: f32 = f32::NAN;
996 assert!(nan.is_nan());
997 assert!(!nan.is_infinite());
998 assert!(!nan.is_finite());
999 assert!(!nan.is_normal());
1000 assert!(nan.is_sign_positive());
1001 assert!(!nan.is_sign_negative());
1002 assert_eq!(Fp::Nan, nan.classify());
1006 fn test_infinity() {
1007 let inf: f32 = f32::INFINITY;
1008 assert!(inf.is_infinite());
1009 assert!(!inf.is_finite());
1010 assert!(inf.is_sign_positive());
1011 assert!(!inf.is_sign_negative());
1012 assert!(!inf.is_nan());
1013 assert!(!inf.is_normal());
1014 assert_eq!(Fp::Infinite, inf.classify());
1018 fn test_neg_infinity() {
1019 let neg_inf: f32 = f32::NEG_INFINITY;
1020 assert!(neg_inf.is_infinite());
1021 assert!(!neg_inf.is_finite());
1022 assert!(!neg_inf.is_sign_positive());
1023 assert!(neg_inf.is_sign_negative());
1024 assert!(!neg_inf.is_nan());
1025 assert!(!neg_inf.is_normal());
1026 assert_eq!(Fp::Infinite, neg_inf.classify());
1031 let zero: f32 = 0.0f32;
1032 assert_eq!(0.0, zero);
1033 assert!(!zero.is_infinite());
1034 assert!(zero.is_finite());
1035 assert!(zero.is_sign_positive());
1036 assert!(!zero.is_sign_negative());
1037 assert!(!zero.is_nan());
1038 assert!(!zero.is_normal());
1039 assert_eq!(Fp::Zero, zero.classify());
1043 fn test_neg_zero() {
1044 let neg_zero: f32 = -0.0;
1045 assert_eq!(0.0, neg_zero);
1046 assert!(!neg_zero.is_infinite());
1047 assert!(neg_zero.is_finite());
1048 assert!(!neg_zero.is_sign_positive());
1049 assert!(neg_zero.is_sign_negative());
1050 assert!(!neg_zero.is_nan());
1051 assert!(!neg_zero.is_normal());
1052 assert_eq!(Fp::Zero, neg_zero.classify());
1057 let one: f32 = 1.0f32;
1058 assert_eq!(1.0, one);
1059 assert!(!one.is_infinite());
1060 assert!(one.is_finite());
1061 assert!(one.is_sign_positive());
1062 assert!(!one.is_sign_negative());
1063 assert!(!one.is_nan());
1064 assert!(one.is_normal());
1065 assert_eq!(Fp::Normal, one.classify());
1070 let nan: f32 = f32::NAN;
1071 let inf: f32 = f32::INFINITY;
1072 let neg_inf: f32 = f32::NEG_INFINITY;
1073 assert!(nan.is_nan());
1074 assert!(!0.0f32.is_nan());
1075 assert!(!5.3f32.is_nan());
1076 assert!(!(-10.732f32).is_nan());
1077 assert!(!inf.is_nan());
1078 assert!(!neg_inf.is_nan());
1082 fn test_is_infinite() {
1083 let nan: f32 = f32::NAN;
1084 let inf: f32 = f32::INFINITY;
1085 let neg_inf: f32 = f32::NEG_INFINITY;
1086 assert!(!nan.is_infinite());
1087 assert!(inf.is_infinite());
1088 assert!(neg_inf.is_infinite());
1089 assert!(!0.0f32.is_infinite());
1090 assert!(!42.8f32.is_infinite());
1091 assert!(!(-109.2f32).is_infinite());
1095 fn test_is_finite() {
1096 let nan: f32 = f32::NAN;
1097 let inf: f32 = f32::INFINITY;
1098 let neg_inf: f32 = f32::NEG_INFINITY;
1099 assert!(!nan.is_finite());
1100 assert!(!inf.is_finite());
1101 assert!(!neg_inf.is_finite());
1102 assert!(0.0f32.is_finite());
1103 assert!(42.8f32.is_finite());
1104 assert!((-109.2f32).is_finite());
1108 fn test_is_normal() {
1109 let nan: f32 = f32::NAN;
1110 let inf: f32 = f32::INFINITY;
1111 let neg_inf: f32 = f32::NEG_INFINITY;
1112 let zero: f32 = 0.0f32;
1113 let neg_zero: f32 = -0.0;
1114 assert!(!nan.is_normal());
1115 assert!(!inf.is_normal());
1116 assert!(!neg_inf.is_normal());
1117 assert!(!zero.is_normal());
1118 assert!(!neg_zero.is_normal());
1119 assert!(1f32.is_normal());
1120 assert!(1e-37f32.is_normal());
1121 assert!(!1e-38f32.is_normal());
1125 fn test_classify() {
1126 let nan: f32 = f32::NAN;
1127 let inf: f32 = f32::INFINITY;
1128 let neg_inf: f32 = f32::NEG_INFINITY;
1129 let zero: f32 = 0.0f32;
1130 let neg_zero: f32 = -0.0;
1131 assert_eq!(nan.classify(), Fp::Nan);
1132 assert_eq!(inf.classify(), Fp::Infinite);
1133 assert_eq!(neg_inf.classify(), Fp::Infinite);
1134 assert_eq!(zero.classify(), Fp::Zero);
1135 assert_eq!(neg_zero.classify(), Fp::Zero);
1136 assert_eq!(1f32.classify(), Fp::Normal);
1137 assert_eq!(1e-37f32.classify(), Fp::Normal);
1138 assert_eq!(1e-38f32.classify(), Fp::Subnormal);
1143 assert_approx_eq!(1.0f32.floor(), 1.0f32);
1144 assert_approx_eq!(1.3f32.floor(), 1.0f32);
1145 assert_approx_eq!(1.5f32.floor(), 1.0f32);
1146 assert_approx_eq!(1.7f32.floor(), 1.0f32);
1147 assert_approx_eq!(0.0f32.floor(), 0.0f32);
1148 assert_approx_eq!((-0.0f32).floor(), -0.0f32);
1149 assert_approx_eq!((-1.0f32).floor(), -1.0f32);
1150 assert_approx_eq!((-1.3f32).floor(), -2.0f32);
1151 assert_approx_eq!((-1.5f32).floor(), -2.0f32);
1152 assert_approx_eq!((-1.7f32).floor(), -2.0f32);
1157 assert_approx_eq!(1.0f32.ceil(), 1.0f32);
1158 assert_approx_eq!(1.3f32.ceil(), 2.0f32);
1159 assert_approx_eq!(1.5f32.ceil(), 2.0f32);
1160 assert_approx_eq!(1.7f32.ceil(), 2.0f32);
1161 assert_approx_eq!(0.0f32.ceil(), 0.0f32);
1162 assert_approx_eq!((-0.0f32).ceil(), -0.0f32);
1163 assert_approx_eq!((-1.0f32).ceil(), -1.0f32);
1164 assert_approx_eq!((-1.3f32).ceil(), -1.0f32);
1165 assert_approx_eq!((-1.5f32).ceil(), -1.0f32);
1166 assert_approx_eq!((-1.7f32).ceil(), -1.0f32);
1171 assert_approx_eq!(1.0f32.round(), 1.0f32);
1172 assert_approx_eq!(1.3f32.round(), 1.0f32);
1173 assert_approx_eq!(1.5f32.round(), 2.0f32);
1174 assert_approx_eq!(1.7f32.round(), 2.0f32);
1175 assert_approx_eq!(0.0f32.round(), 0.0f32);
1176 assert_approx_eq!((-0.0f32).round(), -0.0f32);
1177 assert_approx_eq!((-1.0f32).round(), -1.0f32);
1178 assert_approx_eq!((-1.3f32).round(), -1.0f32);
1179 assert_approx_eq!((-1.5f32).round(), -2.0f32);
1180 assert_approx_eq!((-1.7f32).round(), -2.0f32);
1185 assert_approx_eq!(1.0f32.trunc(), 1.0f32);
1186 assert_approx_eq!(1.3f32.trunc(), 1.0f32);
1187 assert_approx_eq!(1.5f32.trunc(), 1.0f32);
1188 assert_approx_eq!(1.7f32.trunc(), 1.0f32);
1189 assert_approx_eq!(0.0f32.trunc(), 0.0f32);
1190 assert_approx_eq!((-0.0f32).trunc(), -0.0f32);
1191 assert_approx_eq!((-1.0f32).trunc(), -1.0f32);
1192 assert_approx_eq!((-1.3f32).trunc(), -1.0f32);
1193 assert_approx_eq!((-1.5f32).trunc(), -1.0f32);
1194 assert_approx_eq!((-1.7f32).trunc(), -1.0f32);
1199 assert_approx_eq!(1.0f32.fract(), 0.0f32);
1200 assert_approx_eq!(1.3f32.fract(), 0.3f32);
1201 assert_approx_eq!(1.5f32.fract(), 0.5f32);
1202 assert_approx_eq!(1.7f32.fract(), 0.7f32);
1203 assert_approx_eq!(0.0f32.fract(), 0.0f32);
1204 assert_approx_eq!((-0.0f32).fract(), -0.0f32);
1205 assert_approx_eq!((-1.0f32).fract(), -0.0f32);
1206 assert_approx_eq!((-1.3f32).fract(), -0.3f32);
1207 assert_approx_eq!((-1.5f32).fract(), -0.5f32);
1208 assert_approx_eq!((-1.7f32).fract(), -0.7f32);
1213 assert_eq!(INFINITY.abs(), INFINITY);
1214 assert_eq!(1f32.abs(), 1f32);
1215 assert_eq!(0f32.abs(), 0f32);
1216 assert_eq!((-0f32).abs(), 0f32);
1217 assert_eq!((-1f32).abs(), 1f32);
1218 assert_eq!(NEG_INFINITY.abs(), INFINITY);
1219 assert_eq!((1f32/NEG_INFINITY).abs(), 0f32);
1220 assert!(NAN.abs().is_nan());
1225 assert_eq!(INFINITY.signum(), 1f32);
1226 assert_eq!(1f32.signum(), 1f32);
1227 assert_eq!(0f32.signum(), 1f32);
1228 assert_eq!((-0f32).signum(), -1f32);
1229 assert_eq!((-1f32).signum(), -1f32);
1230 assert_eq!(NEG_INFINITY.signum(), -1f32);
1231 assert_eq!((1f32/NEG_INFINITY).signum(), -1f32);
1232 assert!(NAN.signum().is_nan());
1236 fn test_is_sign_positive() {
1237 assert!(INFINITY.is_sign_positive());
1238 assert!(1f32.is_sign_positive());
1239 assert!(0f32.is_sign_positive());
1240 assert!(!(-0f32).is_sign_positive());
1241 assert!(!(-1f32).is_sign_positive());
1242 assert!(!NEG_INFINITY.is_sign_positive());
1243 assert!(!(1f32/NEG_INFINITY).is_sign_positive());
1244 assert!(NAN.is_sign_positive());
1245 assert!(!(-NAN).is_sign_positive());
1249 fn test_is_sign_negative() {
1250 assert!(!INFINITY.is_sign_negative());
1251 assert!(!1f32.is_sign_negative());
1252 assert!(!0f32.is_sign_negative());
1253 assert!((-0f32).is_sign_negative());
1254 assert!((-1f32).is_sign_negative());
1255 assert!(NEG_INFINITY.is_sign_negative());
1256 assert!((1f32/NEG_INFINITY).is_sign_negative());
1257 assert!(!NAN.is_sign_negative());
1258 assert!((-NAN).is_sign_negative());
1263 let nan: f32 = f32::NAN;
1264 let inf: f32 = f32::INFINITY;
1265 let neg_inf: f32 = f32::NEG_INFINITY;
1266 assert_approx_eq!(12.3f32.mul_add(4.5, 6.7), 62.05);
1267 assert_approx_eq!((-12.3f32).mul_add(-4.5, -6.7), 48.65);
1268 assert_approx_eq!(0.0f32.mul_add(8.9, 1.2), 1.2);
1269 assert_approx_eq!(3.4f32.mul_add(-0.0, 5.6), 5.6);
1270 assert!(nan.mul_add(7.8, 9.0).is_nan());
1271 assert_eq!(inf.mul_add(7.8, 9.0), inf);
1272 assert_eq!(neg_inf.mul_add(7.8, 9.0), neg_inf);
1273 assert_eq!(8.9f32.mul_add(inf, 3.2), inf);
1274 assert_eq!((-3.2f32).mul_add(2.4, neg_inf), neg_inf);
1279 let nan: f32 = f32::NAN;
1280 let inf: f32 = f32::INFINITY;
1281 let neg_inf: f32 = f32::NEG_INFINITY;
1282 assert_eq!(1.0f32.recip(), 1.0);
1283 assert_eq!(2.0f32.recip(), 0.5);
1284 assert_eq!((-0.4f32).recip(), -2.5);
1285 assert_eq!(0.0f32.recip(), inf);
1286 assert!(nan.recip().is_nan());
1287 assert_eq!(inf.recip(), 0.0);
1288 assert_eq!(neg_inf.recip(), 0.0);
1293 let nan: f32 = f32::NAN;
1294 let inf: f32 = f32::INFINITY;
1295 let neg_inf: f32 = f32::NEG_INFINITY;
1296 assert_eq!(1.0f32.powi(1), 1.0);
1297 assert_approx_eq!((-3.1f32).powi(2), 9.61);
1298 assert_approx_eq!(5.9f32.powi(-2), 0.028727);
1299 assert_eq!(8.3f32.powi(0), 1.0);
1300 assert!(nan.powi(2).is_nan());
1301 assert_eq!(inf.powi(3), inf);
1302 assert_eq!(neg_inf.powi(2), inf);
1307 let nan: f32 = f32::NAN;
1308 let inf: f32 = f32::INFINITY;
1309 let neg_inf: f32 = f32::NEG_INFINITY;
1310 assert_eq!(1.0f32.powf(1.0), 1.0);
1311 assert_approx_eq!(3.4f32.powf(4.5), 246.408218);
1312 assert_approx_eq!(2.7f32.powf(-3.2), 0.041652);
1313 assert_approx_eq!((-3.1f32).powf(2.0), 9.61);
1314 assert_approx_eq!(5.9f32.powf(-2.0), 0.028727);
1315 assert_eq!(8.3f32.powf(0.0), 1.0);
1316 assert!(nan.powf(2.0).is_nan());
1317 assert_eq!(inf.powf(2.0), inf);
1318 assert_eq!(neg_inf.powf(3.0), neg_inf);
1322 fn test_sqrt_domain() {
1323 assert!(NAN.sqrt().is_nan());
1324 assert!(NEG_INFINITY.sqrt().is_nan());
1325 assert!((-1.0f32).sqrt().is_nan());
1326 assert_eq!((-0.0f32).sqrt(), -0.0);
1327 assert_eq!(0.0f32.sqrt(), 0.0);
1328 assert_eq!(1.0f32.sqrt(), 1.0);
1329 assert_eq!(INFINITY.sqrt(), INFINITY);
1334 assert_eq!(1.0, 0.0f32.exp());
1335 assert_approx_eq!(2.718282, 1.0f32.exp());
1336 assert_approx_eq!(148.413162, 5.0f32.exp());
1338 let inf: f32 = f32::INFINITY;
1339 let neg_inf: f32 = f32::NEG_INFINITY;
1340 let nan: f32 = f32::NAN;
1341 assert_eq!(inf, inf.exp());
1342 assert_eq!(0.0, neg_inf.exp());
1343 assert!(nan.exp().is_nan());
1348 assert_eq!(32.0, 5.0f32.exp2());
1349 assert_eq!(1.0, 0.0f32.exp2());
1351 let inf: f32 = f32::INFINITY;
1352 let neg_inf: f32 = f32::NEG_INFINITY;
1353 let nan: f32 = f32::NAN;
1354 assert_eq!(inf, inf.exp2());
1355 assert_eq!(0.0, neg_inf.exp2());
1356 assert!(nan.exp2().is_nan());
1361 let nan: f32 = f32::NAN;
1362 let inf: f32 = f32::INFINITY;
1363 let neg_inf: f32 = f32::NEG_INFINITY;
1364 assert_approx_eq!(1.0f32.exp().ln(), 1.0);
1365 assert!(nan.ln().is_nan());
1366 assert_eq!(inf.ln(), inf);
1367 assert!(neg_inf.ln().is_nan());
1368 assert!((-2.3f32).ln().is_nan());
1369 assert_eq!((-0.0f32).ln(), neg_inf);
1370 assert_eq!(0.0f32.ln(), neg_inf);
1371 assert_approx_eq!(4.0f32.ln(), 1.386294);
1376 let nan: f32 = f32::NAN;
1377 let inf: f32 = f32::INFINITY;
1378 let neg_inf: f32 = f32::NEG_INFINITY;
1379 assert_eq!(10.0f32.log(10.0), 1.0);
1380 assert_approx_eq!(2.3f32.log(3.5), 0.664858);
1381 assert_eq!(1.0f32.exp().log(1.0f32.exp()), 1.0);
1382 assert!(1.0f32.log(1.0).is_nan());
1383 assert!(1.0f32.log(-13.9).is_nan());
1384 assert!(nan.log(2.3).is_nan());
1385 assert_eq!(inf.log(10.0), inf);
1386 assert!(neg_inf.log(8.8).is_nan());
1387 assert!((-2.3f32).log(0.1).is_nan());
1388 assert_eq!((-0.0f32).log(2.0), neg_inf);
1389 assert_eq!(0.0f32.log(7.0), neg_inf);
1394 let nan: f32 = f32::NAN;
1395 let inf: f32 = f32::INFINITY;
1396 let neg_inf: f32 = f32::NEG_INFINITY;
1397 assert_approx_eq!(10.0f32.log2(), 3.321928);
1398 assert_approx_eq!(2.3f32.log2(), 1.201634);
1399 assert_approx_eq!(1.0f32.exp().log2(), 1.442695);
1400 assert!(nan.log2().is_nan());
1401 assert_eq!(inf.log2(), inf);
1402 assert!(neg_inf.log2().is_nan());
1403 assert!((-2.3f32).log2().is_nan());
1404 assert_eq!((-0.0f32).log2(), neg_inf);
1405 assert_eq!(0.0f32.log2(), neg_inf);
1410 let nan: f32 = f32::NAN;
1411 let inf: f32 = f32::INFINITY;
1412 let neg_inf: f32 = f32::NEG_INFINITY;
1413 assert_eq!(10.0f32.log10(), 1.0);
1414 assert_approx_eq!(2.3f32.log10(), 0.361728);
1415 assert_approx_eq!(1.0f32.exp().log10(), 0.434294);
1416 assert_eq!(1.0f32.log10(), 0.0);
1417 assert!(nan.log10().is_nan());
1418 assert_eq!(inf.log10(), inf);
1419 assert!(neg_inf.log10().is_nan());
1420 assert!((-2.3f32).log10().is_nan());
1421 assert_eq!((-0.0f32).log10(), neg_inf);
1422 assert_eq!(0.0f32.log10(), neg_inf);
1426 fn test_to_degrees() {
1427 let pi: f32 = consts::PI;
1428 let nan: f32 = f32::NAN;
1429 let inf: f32 = f32::INFINITY;
1430 let neg_inf: f32 = f32::NEG_INFINITY;
1431 assert_eq!(0.0f32.to_degrees(), 0.0);
1432 assert_approx_eq!((-5.8f32).to_degrees(), -332.315521);
1433 assert_eq!(pi.to_degrees(), 180.0);
1434 assert!(nan.to_degrees().is_nan());
1435 assert_eq!(inf.to_degrees(), inf);
1436 assert_eq!(neg_inf.to_degrees(), neg_inf);
1437 assert_eq!(1_f32.to_degrees(), 57.2957795130823208767981548141051703);
1441 fn test_to_radians() {
1442 let pi: f32 = consts::PI;
1443 let nan: f32 = f32::NAN;
1444 let inf: f32 = f32::INFINITY;
1445 let neg_inf: f32 = f32::NEG_INFINITY;
1446 assert_eq!(0.0f32.to_radians(), 0.0);
1447 assert_approx_eq!(154.6f32.to_radians(), 2.698279);
1448 assert_approx_eq!((-332.31f32).to_radians(), -5.799903);
1449 assert_eq!(180.0f32.to_radians(), pi);
1450 assert!(nan.to_radians().is_nan());
1451 assert_eq!(inf.to_radians(), inf);
1452 assert_eq!(neg_inf.to_radians(), neg_inf);
1457 assert_eq!(0.0f32.asinh(), 0.0f32);
1458 assert_eq!((-0.0f32).asinh(), -0.0f32);
1460 let inf: f32 = f32::INFINITY;
1461 let neg_inf: f32 = f32::NEG_INFINITY;
1462 let nan: f32 = f32::NAN;
1463 assert_eq!(inf.asinh(), inf);
1464 assert_eq!(neg_inf.asinh(), neg_inf);
1465 assert!(nan.asinh().is_nan());
1466 assert_approx_eq!(2.0f32.asinh(), 1.443635475178810342493276740273105f32);
1467 assert_approx_eq!((-2.0f32).asinh(), -1.443635475178810342493276740273105f32);
1472 assert_eq!(1.0f32.acosh(), 0.0f32);
1473 assert!(0.999f32.acosh().is_nan());
1475 let inf: f32 = f32::INFINITY;
1476 let neg_inf: f32 = f32::NEG_INFINITY;
1477 let nan: f32 = f32::NAN;
1478 assert_eq!(inf.acosh(), inf);
1479 assert!(neg_inf.acosh().is_nan());
1480 assert!(nan.acosh().is_nan());
1481 assert_approx_eq!(2.0f32.acosh(), 1.31695789692481670862504634730796844f32);
1482 assert_approx_eq!(3.0f32.acosh(), 1.76274717403908605046521864995958461f32);
1487 assert_eq!(0.0f32.atanh(), 0.0f32);
1488 assert_eq!((-0.0f32).atanh(), -0.0f32);
1490 let inf32: f32 = f32::INFINITY;
1491 let neg_inf32: f32 = f32::NEG_INFINITY;
1492 assert_eq!(1.0f32.atanh(), inf32);
1493 assert_eq!((-1.0f32).atanh(), neg_inf32);
1495 assert!(2f64.atanh().atanh().is_nan());
1496 assert!((-2f64).atanh().atanh().is_nan());
1498 let inf64: f32 = f32::INFINITY;
1499 let neg_inf64: f32 = f32::NEG_INFINITY;
1500 let nan32: f32 = f32::NAN;
1501 assert!(inf64.atanh().is_nan());
1502 assert!(neg_inf64.atanh().is_nan());
1503 assert!(nan32.atanh().is_nan());
1505 assert_approx_eq!(0.5f32.atanh(), 0.54930614433405484569762261846126285f32);
1506 assert_approx_eq!((-0.5f32).atanh(), -0.54930614433405484569762261846126285f32);
1510 fn test_real_consts() {
1513 let pi: f32 = consts::PI;
1514 let frac_pi_2: f32 = consts::FRAC_PI_2;
1515 let frac_pi_3: f32 = consts::FRAC_PI_3;
1516 let frac_pi_4: f32 = consts::FRAC_PI_4;
1517 let frac_pi_6: f32 = consts::FRAC_PI_6;
1518 let frac_pi_8: f32 = consts::FRAC_PI_8;
1519 let frac_1_pi: f32 = consts::FRAC_1_PI;
1520 let frac_2_pi: f32 = consts::FRAC_2_PI;
1521 let frac_2_sqrtpi: f32 = consts::FRAC_2_SQRT_PI;
1522 let sqrt2: f32 = consts::SQRT_2;
1523 let frac_1_sqrt2: f32 = consts::FRAC_1_SQRT_2;
1524 let e: f32 = consts::E;
1525 let log2_e: f32 = consts::LOG2_E;
1526 let log10_e: f32 = consts::LOG10_E;
1527 let ln_2: f32 = consts::LN_2;
1528 let ln_10: f32 = consts::LN_10;
1530 assert_approx_eq!(frac_pi_2, pi / 2f32);
1531 assert_approx_eq!(frac_pi_3, pi / 3f32);
1532 assert_approx_eq!(frac_pi_4, pi / 4f32);
1533 assert_approx_eq!(frac_pi_6, pi / 6f32);
1534 assert_approx_eq!(frac_pi_8, pi / 8f32);
1535 assert_approx_eq!(frac_1_pi, 1f32 / pi);
1536 assert_approx_eq!(frac_2_pi, 2f32 / pi);
1537 assert_approx_eq!(frac_2_sqrtpi, 2f32 / pi.sqrt());
1538 assert_approx_eq!(sqrt2, 2f32.sqrt());
1539 assert_approx_eq!(frac_1_sqrt2, 1f32 / 2f32.sqrt());
1540 assert_approx_eq!(log2_e, e.log2());
1541 assert_approx_eq!(log10_e, e.log10());
1542 assert_approx_eq!(ln_2, 2f32.ln());
1543 assert_approx_eq!(ln_10, 10f32.ln());
1547 fn test_float_bits_conv() {
1548 assert_eq!((1f32).to_bits(), 0x3f800000);
1549 assert_eq!((12.5f32).to_bits(), 0x41480000);
1550 assert_eq!((1337f32).to_bits(), 0x44a72000);
1551 assert_eq!((-14.25f32).to_bits(), 0xc1640000);
1552 assert_approx_eq!(f32::from_bits(0x3f800000), 1.0);
1553 assert_approx_eq!(f32::from_bits(0x41480000), 12.5);
1554 assert_approx_eq!(f32::from_bits(0x44a72000), 1337.0);
1555 assert_approx_eq!(f32::from_bits(0xc1640000), -14.25);
1557 // Check that NaNs roundtrip their bits regardless of signalingness
1558 // 0xA is 0b1010; 0x5 is 0b0101 -- so these two together clobbers all the mantissa bits
1559 let masked_nan1 = f32::NAN.to_bits() ^ 0x002A_AAAA;
1560 let masked_nan2 = f32::NAN.to_bits() ^ 0x0055_5555;
1561 assert!(f32::from_bits(masked_nan1).is_nan());
1562 assert!(f32::from_bits(masked_nan2).is_nan());
1564 assert_eq!(f32::from_bits(masked_nan1).to_bits(), masked_nan1);
1565 assert_eq!(f32::from_bits(masked_nan2).to_bits(), masked_nan2);