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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-06-07 05:48:48 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-06-07 05:48:48 +0000
commitef24de24a82fe681581cc130f342363c47c0969a (patch)
tree0d494f7e1a38b95c92426f58fe6eaa877303a86c /vendor/libm-0.1.4/src/math/k_sin.rs
parentReleasing progress-linux version 1.74.1+dfsg1-1~progress7.99u1. (diff)
downloadrustc-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/k_sin.rs')
-rw-r--r--vendor/libm-0.1.4/src/math/k_sin.rs58
1 files changed, 0 insertions, 58 deletions
diff --git a/vendor/libm-0.1.4/src/math/k_sin.rs b/vendor/libm-0.1.4/src/math/k_sin.rs
deleted file mode 100644
index 5d2bd68aa..000000000
--- a/vendor/libm-0.1.4/src/math/k_sin.rs
+++ /dev/null
@@ -1,58 +0,0 @@
-// origin: FreeBSD /usr/src/lib/msun/src/k_sin.c
-//
-// ====================================================
-// Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
-//
-// Developed at SunSoft, a Sun Microsystems, Inc. business.
-// Permission to use, copy, modify, and distribute this
-// software is freely granted, provided that this notice
-// is preserved.
-// ====================================================
-
-const S1: f64 = -1.66666666666666324348e-01; /* 0xBFC55555, 0x55555549 */
-const S2: f64 = 8.33333333332248946124e-03; /* 0x3F811111, 0x1110F8A6 */
-const S3: f64 = -1.98412698298579493134e-04; /* 0xBF2A01A0, 0x19C161D5 */
-const S4: f64 = 2.75573137070700676789e-06; /* 0x3EC71DE3, 0x57B1FE7D */
-const S5: f64 = -2.50507602534068634195e-08; /* 0xBE5AE5E6, 0x8A2B9CEB */
-const S6: f64 = 1.58969099521155010221e-10; /* 0x3DE5D93A, 0x5ACFD57C */
-
-// kernel sin function on ~[-pi/4, pi/4] (except on -0), pi/4 ~ 0.7854
-// Input x is assumed to be bounded by ~pi/4 in magnitude.
-// Input y is the tail of x.
-// Input iy indicates whether y is 0. (if iy=0, y assume to be 0).
-//
-// Algorithm
-// 1. Since sin(-x) = -sin(x), we need only to consider positive x.
-// 2. Callers must return sin(-0) = -0 without calling here since our
-// odd polynomial is not evaluated in a way that preserves -0.
-// Callers may do the optimization sin(x) ~ x for tiny x.
-// 3. sin(x) is approximated by a polynomial of degree 13 on
-// [0,pi/4]
-// 3 13
-// sin(x) ~ x + S1*x + ... + S6*x
-// where
-//
-// |sin(x) 2 4 6 8 10 12 | -58
-// |----- - (1+S1*x +S2*x +S3*x +S4*x +S5*x +S6*x )| <= 2
-// | x |
-//
-// 4. sin(x+y) = sin(x) + sin'(x')*y
-// ~ sin(x) + (1-x*x/2)*y
-// For better accuracy, let
-// 3 2 2 2 2
-// r = x *(S2+x *(S3+x *(S4+x *(S5+x *S6))))
-// then 3 2
-// sin(x) = x + (S1*x + (x *(r-y/2)+y))
-#[inline]
-#[cfg_attr(all(test, assert_no_panic), no_panic::no_panic)]
-pub(crate) fn k_sin(x: f64, y: f64, iy: i32) -> f64 {
- let z = x * x;
- let w = z * z;
- let r = S2 + z * (S3 + z * S4) + z * w * (S5 + z * S6);
- let v = z * x;
- if iy == 0 {
- x + v * (S1 + z * r)
- } else {
- x - ((z * (0.5 * y - v * r) - y) - v * S1)
- }
-}