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annotate src/libm/s_copysign.c @ 5029:5d7d48157be7

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Greg Jandl to SDL I did some digging, and I think I've found a better solution. By including some additional .m4 macros in the acinclude directory (http://www.gnu.org/software/autoconf-archive/ax_check_compiler_flags.html, http://www.gnu.org/software/autoconf-archive/ax_gcc_archflag.html and http://www.gnu.org/software/autoconf-archive/ax_gcc_x86_cpuid.html) then using the patch below (same as previous patch + one line change to configure.in), SDL will build correctly out of the box. The arch can then be overridden by --with-gcc-arch=<arch> (most will probably want to build with i686 there for general distribution) or --without-gcc-arch, to disable setting the arch all together. On my Atom netbook, I get -march=PentiumPro by default, which works great, as does --with-gcc-arch=i686.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 18 Jan 2011 22:40:45 -0800
parents dc1eb82ffdaa
children
rev   line source
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a98604b691c8 Expanded the libm support and put it into a separate directory.
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1 /* @(#)s_copysign.c 5.1 93/09/24 */
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2 /*
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3 * ====================================================
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4 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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5 *
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6 * Developed at SunPro, a Sun Microsystems, Inc. business.
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7 * Permission to use, copy, modify, and distribute this
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8 * software is freely granted, provided that this notice
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9 * is preserved.
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10 * ====================================================
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11 */
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12
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13 #if defined(LIBM_SCCS) && !defined(lint)
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14 static const char rcsid[] =
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15 "$NetBSD: s_copysign.c,v 1.8 1995/05/10 20:46:57 jtc Exp $";
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16 #endif
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17
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18 /*
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19 * copysign(double x, double y)
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20 * copysign(x,y) returns a value with the magnitude of x and
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21 * with the sign bit of y.
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22 */
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23
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24 #include "math.h"
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25 #include "math_private.h"
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26
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27 libm_hidden_proto(copysign)
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28 #ifdef __STDC__
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29 double copysign(double x, double y)
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30 #else
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31 double copysign(x, y)
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32 double x, y;
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33 #endif
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34 {
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35 u_int32_t hx, hy;
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36 GET_HIGH_WORD(hx, x);
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37 GET_HIGH_WORD(hy, y);
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38 SET_HIGH_WORD(x, (hx & 0x7fffffff) | (hy & 0x80000000));
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39 return x;
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40 }
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41
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42 libm_hidden_def(copysign)