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author | David Schultz <das@FreeBSD.org> | 2005-03-07 04:54:51 +0000 |
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committer | David Schultz <das@FreeBSD.org> | 2005-03-07 04:54:51 +0000 |
commit | e0fe8e44407ab4c59902f18d6542f1faa6ba1d58 (patch) | |
tree | 1ecc5d3d7dea2e10f690e4759282ecf75b3b01d5 /lib | |
parent | f8a40fca14d99671f7047eadfac4c0bbfbd89e11 (diff) | |
download | src-e0fe8e44407ab4c59902f18d6542f1faa6ba1d58.tar.gz src-e0fe8e44407ab4c59902f18d6542f1faa6ba1d58.zip |
Implement frexpl.
Notes
Notes:
svn path=/head/; revision=143213
Diffstat (limited to 'lib')
-rw-r--r-- | lib/msun/src/s_frexpl.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/lib/msun/src/s_frexpl.c b/lib/msun/src/s_frexpl.c new file mode 100644 index 000000000000..d34f55d9f4f8 --- /dev/null +++ b/lib/msun/src/s_frexpl.c @@ -0,0 +1,62 @@ +/*- + * Copyright (c) 2004-2005 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. + * + * $FreeBSD$ + */ + +#include <float.h> +#include <math.h> + +#include "fpmath.h" + +#if LDBL_MAX_EXP != 0x4000 +#error "Unsupported long double format" +#endif + +long double +frexpl(long double x, int *ex) +{ + union IEEEl2bits u; + + u.e = x; + switch (u.bits.exp) { + case 0: /* 0 or subnormal */ + if ((u.bits.manl | u.bits.manh) == 0) { + *ex = 0; + } else { + u.e *= 0x1.0p514; + *ex = u.bits.exp - 0x4200; + u.bits.exp = 0x3ffe; + } + break; + case 0x7fff: /* infinity or NaN; value of *ex is unspecified */ + break; + default: /* normal */ + *ex = u.bits.exp - 0x3ffe; + u.bits.exp = 0x3ffe; + break; + } + return (u.e); +} |