X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Fmath%2Fcosl.c;h=79c41c77fa6a0addc57e33c62f31d879392b36e6;hb=a7dbcf5c8ca7edb7a46eb276031ad1df4131135b;hp=25d9005ac5b98545ab44f5e2bcb3c65c51dc4117;hpb=2e8c8fbe7d65ba0026cb084dc8570d94cbc908ff;p=musl

diff --git a/src/math/cosl.c b/src/math/cosl.c
index 25d9005a..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;
-	int e0;
-	long double y[2];
-	long double hi, lo;
-
-	z.e = x;
-	z.bits.sign = 0;
-
-	/* If x = +-0 or x is a subnormal number, then cos(x) = 1 */
-	if (z.bits.exp == 0)
-		return 1.0;
-
-	/* If x = NaN or Inf, then cos(x) = NaN. */
-	if (z.bits.exp == 32767)
-		return (x - x) / (x - x);
-
-	/* Optimize the case where x is already within range. */
-	if (z.e < M_PI_4)
-		return __cosl(z.e, 0);
-
-	e0 = __rem_pio2l(x, y);
+	union ldshape u = {x};
+	unsigned n;
+	long double y[2], hi, lo;
+
+	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(x, 0);
+	}
+	n = __rem_pio2l(x, y);
 	hi = y[0];
 	lo = y[1];
-
-	switch (e0 & 3) {
+	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