From 9835e2ae736235810b4ea1c162ca5e65c547e770 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sat, 18 May 2024 04:49:50 +0200
Subject: Merging upstream version 1.71.1+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 vendor/libm-0.1.4/src/math/logf.rs | 66 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create 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
new file mode 100644
index 000000000..95195601c
--- /dev/null
+++ b/vendor/libm-0.1.4/src/math/logf.rs
@@ -0,0 +1,66 @@
+/* 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
+}
-- 
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