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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-06-07 05:48:48 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-06-07 05:48:48 +0000 |
commit | ef24de24a82fe681581cc130f342363c47c0969a (patch) | |
tree | 0d494f7e1a38b95c92426f58fe6eaa877303a86c /vendor/libm-0.1.4/src/math/atan2f.rs | |
parent | Releasing progress-linux version 1.74.1+dfsg1-1~progress7.99u1. (diff) | |
download | rustc-ef24de24a82fe681581cc130f342363c47c0969a.tar.xz rustc-ef24de24a82fe681581cc130f342363c47c0969a.zip |
Merging upstream version 1.75.0+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'vendor/libm-0.1.4/src/math/atan2f.rs')
-rw-r--r-- | vendor/libm-0.1.4/src/math/atan2f.rs | 92 |
1 files changed, 0 insertions, 92 deletions
diff --git a/vendor/libm-0.1.4/src/math/atan2f.rs b/vendor/libm-0.1.4/src/math/atan2f.rs deleted file mode 100644 index 7bbe5f1d4..000000000 --- a/vendor/libm-0.1.4/src/math/atan2f.rs +++ /dev/null @@ -1,92 +0,0 @@ -/* origin: FreeBSD /usr/src/lib/msun/src/e_atan2f.c */ -/* - * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. - */ -/* - * ==================================================== - * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. - * - * Developed at SunPro, a Sun Microsystems, Inc. business. - * Permission to use, copy, modify, and distribute this - * software is freely granted, provided that this notice - * is preserved. - * ==================================================== - */ - -use super::atanf; -use super::fabsf; - -const PI: f32 = 3.1415927410e+00; /* 0x40490fdb */ -const PI_LO: f32 = -8.7422776573e-08; /* 0xb3bbbd2e */ - -/// Arctangent of y/x (f32) -/// -/// Computes the inverse tangent (arc tangent) of `y/x`. -/// Produces the correct result even for angles near pi/2 or -pi/2 (that is, when `x` is near 0). -/// Returns a value in radians, in the range of -pi to pi. -#[inline] -#[cfg_attr(all(test, assert_no_panic), no_panic::no_panic)] -pub fn atan2f(y: f32, x: f32) -> f32 { - if x.is_nan() || y.is_nan() { - return x + y; - } - let mut ix = x.to_bits(); - let mut iy = y.to_bits(); - - if ix == 0x3f800000 { - /* x=1.0 */ - return atanf(y); - } - let m = ((iy >> 31) & 1) | ((ix >> 30) & 2); /* 2*sign(x)+sign(y) */ - ix &= 0x7fffffff; - iy &= 0x7fffffff; - - /* when y = 0 */ - if iy == 0 { - return match m { - 0 | 1 => y, /* atan(+-0,+anything)=+-0 */ - 2 => PI, /* atan(+0,-anything) = pi */ - 3 | _ => -PI, /* atan(-0,-anything) =-pi */ - }; - } - /* when x = 0 */ - if ix == 0 { - return if m & 1 != 0 { -PI / 2. } else { PI / 2. }; - } - /* when x is INF */ - if ix == 0x7f800000 { - return if iy == 0x7f800000 { - match m { - 0 => PI / 4., /* atan(+INF,+INF) */ - 1 => -PI / 4., /* atan(-INF,+INF) */ - 2 => 3. * PI / 4., /* atan(+INF,-INF)*/ - 3 | _ => -3. * PI / 4., /* atan(-INF,-INF)*/ - } - } else { - match m { - 0 => 0., /* atan(+...,+INF) */ - 1 => -0., /* atan(-...,+INF) */ - 2 => PI, /* atan(+...,-INF) */ - 3 | _ => -PI, /* atan(-...,-INF) */ - } - }; - } - /* |y/x| > 0x1p26 */ - if (ix + (26 << 23) < iy) || (iy == 0x7f800000) { - return if m & 1 != 0 { -PI / 2. } else { PI / 2. }; - } - - /* z = atan(|y/x|) with correct underflow */ - let z = if (m & 2 != 0) && (iy + (26 << 23) < ix) { - /*|y/x| < 0x1p-26, x < 0 */ - 0. - } else { - atanf(fabsf(y / x)) - }; - match m { - 0 => z, /* atan(+,+) */ - 1 => -z, /* atan(-,+) */ - 2 => PI - (z - PI_LO), /* atan(+,-) */ - _ => (z - PI_LO) - PI, /* case 3 */ /* atan(-,-) */ - } -} |