From ef24de24a82fe681581cc130f342363c47c0969a Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 7 Jun 2024 07:48:48 +0200 Subject: Merging upstream version 1.75.0+dfsg1. Signed-off-by: Daniel Baumann --- vendor/libm-0.1.4/src/math/logf.rs | 66 -------------------------------------- 1 file changed, 66 deletions(-) delete mode 100644 vendor/libm-0.1.4/src/math/logf.rs (limited to 'vendor/libm-0.1.4/src/math/logf.rs') diff --git a/vendor/libm-0.1.4/src/math/logf.rs b/vendor/libm-0.1.4/src/math/logf.rs deleted file mode 100644 index 95195601c..000000000 --- a/vendor/libm-0.1.4/src/math/logf.rs +++ /dev/null @@ -1,66 +0,0 @@ -/* origin: FreeBSD /usr/src/lib/msun/src/e_logf.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. - * ==================================================== - */ - -const LN2_HI: f32 = 6.9313812256e-01; /* 0x3f317180 */ -const LN2_LO: f32 = 9.0580006145e-06; /* 0x3717f7d1 */ -/* |(log(1+s)-log(1-s))/s - Lg(s)| < 2**-34.24 (~[-4.95e-11, 4.97e-11]). */ -const LG1: f32 = 0.66666662693; /* 0xaaaaaa.0p-24*/ -const LG2: f32 = 0.40000972152; /* 0xccce13.0p-25 */ -const LG3: f32 = 0.28498786688; /* 0x91e9ee.0p-25 */ -const LG4: f32 = 0.24279078841; /* 0xf89e26.0p-26 */ - -#[inline] -#[cfg_attr(all(test, assert_no_panic), no_panic::no_panic)] -pub fn logf(mut x: f32) -> f32 { - let x1p25 = f32::from_bits(0x4c000000); // 0x1p25f === 2 ^ 25 - - let mut ix = x.to_bits(); - let mut k = 0i32; - - if (ix < 0x00800000) || ((ix >> 31) != 0) { - /* x < 2**-126 */ - if ix << 1 == 0 { - return -1. / (x * x); /* log(+-0)=-inf */ - } - if (ix >> 31) != 0 { - return (x - x) / 0.; /* log(-#) = NaN */ - } - /* subnormal number, scale up x */ - k -= 25; - x *= x1p25; - ix = x.to_bits(); - } else if ix >= 0x7f800000 { - return x; - } else if ix == 0x3f800000 { - return 0.; - } - - /* reduce x into [sqrt(2)/2, sqrt(2)] */ - ix += 0x3f800000 - 0x3f3504f3; - k += ((ix >> 23) as i32) - 0x7f; - ix = (ix & 0x007fffff) + 0x3f3504f3; - x = f32::from_bits(ix); - - let f = x - 1.; - let s = f / (2. + f); - let z = s * s; - let w = z * z; - let t1 = w * (LG2 + w * LG4); - let t2 = z * (LG1 + w * LG3); - let r = t2 + t1; - let hfsq = 0.5 * f * f; - let dk = k as f32; - s * (hfsq + r) + dk * LN2_LO - hfsq + f + dk * LN2_HI -} -- cgit v1.2.3