mirror of
git://sourceware.org/git/newlib-cygwin.git
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048ebea981
Rename s_nearbyint.c, s_fdim.c and s_scalbln.c to remove conflicts
Remove functions that are not needed from above files
Modify include paths
Add includes missing in cygwin build
Add missing types
Create Makefiles
Create header files to resolve dependencies between directories
Modify some instances of unsigned long to uint64_t for 32 bit platforms
Add HAVE_FPMATH_H
55 lines
1.2 KiB
C
55 lines
1.2 KiB
C
/*
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* From: @(#)s_ilogb.c 5.1 93/09/24
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <float.h>
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#include <limits.h>
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#include <math.h>
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#include <stdint.h>
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#include "fpmath.h"
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int
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ilogbl(long double x)
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{
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union IEEEl2bits u;
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uint64_t m;
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int b;
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u.e = x;
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if (u.bits.exp == 0) {
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if ((u.bits.manl | u.bits.manh) == 0)
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return (FP_ILOGB0);
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/* denormalized */
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if (u.bits.manh == 0) {
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m = 1llu << (LDBL_MANL_SIZE - 1);
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for (b = LDBL_MANH_SIZE; !(u.bits.manl & m); m >>= 1)
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b++;
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} else {
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m = 1llu << (LDBL_MANH_SIZE - 1);
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for (b = 0; !(u.bits.manh & m); m >>= 1)
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b++;
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}
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#ifdef LDBL_IMPLICIT_NBIT
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b++;
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#endif
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return (LDBL_MIN_EXP - b - 1);
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} else if (u.bits.exp < (LDBL_MAX_EXP << 1) - 1)
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return (u.bits.exp - LDBL_MAX_EXP + 1);
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else if (u.bits.manl != 0 || u.bits.manh != 0)
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return (FP_ILOGBNAN);
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else
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return (INT_MAX);
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}
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