37 lines
1.1 KiB
C
Executable File
37 lines
1.1 KiB
C
Executable File
/* ldexpf.c: Build a float from a mantisa and exponent.
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Copyright (C) 2001, 2002 Jesus Calvino-Fraga, jesusc@ieee.org
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/* Version 1.0 - Initial release */
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#include "math.h"
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#include "errno.h"
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float ldexpf(const float x, const int pw2)
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{
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union float_long fl;
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long e;
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fl.f = x;
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e=(fl.l >> 23) & 0x000000ff;
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e+=pw2;
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fl.l= ((e & 0xff) << 23) | (fl.l & 0x807fffff);
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return(fl.f);
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}
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