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db89cf8efb
* Use bit twiddling. This requires inclusion of math_private.h and inclusion of float.h in s_roundl.c. Raise invalid exception. * Use literal integer constants where possible. Let the compiler do the appropriate conversion. * In s_roundf.c, use an F suffix on float constants instead of promoting float to double and then converting the result back to float. In s_roundl.c, use an L suffix. * In s_roundl.c, use the ENTERI and RETURNI macros. This requires the inclusion of fpmath.h and on __i386__ class hardware ieeefp.h. Reviewed by: bde
62 lines
1.8 KiB
C
62 lines
1.8 KiB
C
/*-
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* Copyright (c) 2003, Steven G. Kargl
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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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#ifdef __i386__
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#include <ieeefp.h>
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#endif
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#include "fpmath.h"
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#include "math.h"
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#include "math_private.h"
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long double
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roundl(long double x)
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{
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long double t;
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uint16_t hx;
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GET_LDBL_EXPSIGN(hx, x);
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if ((hx & 0x7fff) == 0x7fff)
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return (x + x);
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ENTERI();
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if (!(hx & 0x8000)) {
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t = floorl(x);
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if (t - x <= -0.5L)
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t += 1;
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RETURNI(t);
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} else {
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t = floorl(-x);
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if (t + x <= -0.5L)
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t += 1;
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RETURNI(-t);
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}
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}
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