GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libm/src/s_trunc.c Lines: 0 19 0.0 %
Date: 2017-11-13 Branches: 0 18 0.0 %

Line Branch Exec Source
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/* @(#)s_floor.c 5.1 93/09/24 */
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/*
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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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/*
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 * trunc(x)
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 * Return x rounded toward 0 to integral value
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 * Method:
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 *	Bit twiddling.
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 * Exception:
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 *	Inexact flag raised if x not equal to trunc(x).
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 */
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#include <float.h>
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#include <math.h>
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#include "math_private.h"
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static const double huge = 1.0e300;
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double
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trunc(double x)
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{
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	int32_t i0,i1,jj0;
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	u_int32_t i;
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	EXTRACT_WORDS(i0,i1,x);
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	jj0 = ((i0>>20)&0x7ff)-0x3ff;
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	if(jj0<20) {
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	    if(jj0<0) { 	/* raise inexact if x != 0 */
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		if(huge+x>0.0) {/* |x|<1, so return 0*sign(x) */
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		    i0 &= 0x80000000U;
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		    i1 = 0;
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		}
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	    } else {
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		i = (0x000fffff)>>jj0;
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		if(((i0&i)|i1)==0) return x; /* x is integral */
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		if(huge+x>0.0) {	/* raise inexact flag */
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		    i0 &= (~i); i1=0;
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		}
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	    }
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	} else if (jj0>51) {
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	    if(jj0==0x400) return x+x;	/* inf or NaN */
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	    else return x;		/* x is integral */
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	} else {
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	    i = ((u_int32_t)(0xffffffff))>>(jj0-20);
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	    if((i1&i)==0) return x;	/* x is integral */
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	    if(huge+x>0.0)		/* raise inexact flag */
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		i1 &= (~i);
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	}
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	INSERT_WORDS(x,i0,i1);
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	return x;
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}
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DEF_STD(trunc);
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LDBL_MAYBE_UNUSED_CLONE(trunc);