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-rw-r--r--src/math/cosl.c70
1 files changed, 14 insertions, 56 deletions
diff --git a/src/math/cosl.c b/src/math/cosl.c
index 0794d284..79c41c77 100644
--- a/src/math/cosl.c
+++ b/src/math/cosl.c
@@ -1,34 +1,3 @@
-/* origin: FreeBSD /usr/src/lib/msun/src/s_cosl.c */
-/*-
- * Copyright (c) 2007 Steven G. Kargl
- * 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 unmodified, 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 ``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 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.
- */
-/*
- * Limited testing on pseudorandom numbers drawn within [-2e8:4e8] shows
- * an accuracy of <= 0.7412 ULP.
- */
-
#include "libm.h"
#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
@@ -38,44 +7,33 @@ long double cosl(long double x) {
#elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
long double cosl(long double x)
{
- union IEEEl2bits z;
+ union ldshape u = {x};
unsigned n;
- long double y[2];
- long double hi, lo;
-
- z.e = x;
- z.bits.sign = 0;
+ long double y[2], hi, lo;
- /* If x = NaN or Inf, then cos(x) = NaN. */
- if (z.bits.exp == 0x7fff)
- return (x - x) / (x - x);
-
- /* |x| < (double)pi/4 */
- if (z.e < M_PI_4) {
- /* |x| < 0x1p-64 */
- if (z.bits.exp < 0x3fff - 64)
+ u.i.se &= 0x7fff;
+ if (u.i.se == 0x7fff)
+ return x - x;
+ x = u.f;
+ if (x < M_PI_4) {
+ if (u.i.se < 0x3fff - LDBL_MANT_DIG)
/* raise inexact if x!=0 */
return 1.0 + x;
- return __cosl(z.e, 0);
+ return __cosl(x, 0);
}
-
n = __rem_pio2l(x, y);
hi = y[0];
lo = y[1];
switch (n & 3) {
case 0:
- hi = __cosl(hi, lo);
- break;
+ return __cosl(hi, lo);
case 1:
- hi = -__sinl(hi, lo, 1);
- break;
+ return -__sinl(hi, lo, 1);
case 2:
- hi = -__cosl(hi, lo);
- break;
+ return -__cosl(hi, lo);
case 3:
- hi = __sinl(hi, lo, 1);
- break;
+ default:
+ return __sinl(hi, lo, 1);
}
- return hi;
}
#endif