rename __exp to __expo2

[libm] / src / math / __exp.c

diff --git a/src/math/__exp.c b/src/math/__exp.c
deleted file mode 100644 (file)
index ef14e5f..0000000
--- a/src/math/__exp.c
+++ /dev/null
@@ -1,51 +0,0 @@
-/* origin: FreeBSD /usr/src/lib/msun/src/k_exp.c */
-/*-
- * Copyright (c) 2011 David Schultz <das@FreeBSD.ORG>
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#include "libm.h"
-
-/*
- * We use exp(x) = exp(x - kln2) * 2**k,
- * k is carefully chosen to minimize |exp(kln2) - 2**k|
- */
-static const uint32_t k = 1799;
-static const double kln2 = 1246.97177782734161156;
-
-/* exp(x)/2 when x is huge */
-double __expo2(double x)
-{
-       double scale;
-       int n;
-
-       /*
-        * efficient scalbn(y, k-1):
-        * 2**(k-1) cannot be represented
-        * so we use that k-1 is even and scale in two steps
-        */
-       n = (k - 1)/2;
-       INSERT_WORDS(scale, (0x3ff + n) << 20, 0);
-       return exp(x - kln2) * scale * scale;
-}