elf.h: add ELFCOMPRESS_ZSTD

[musl] / src / math / cosl.c

diff --git a/src/math/cosl.c b/src/math/cosl.c
index 0794d28..79c41c7 100644 (file)
--- 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