2 * ====================================================
3 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
5 * Developed at SunPro, a Sun Microsystems, Inc. business.
6 * Permission to use, copy, modify, and distribute this
7 * software is freely granted, provided that this notice
9 * ====================================================
14 * Return x rounded toward -inf to integral value
18 * Inexact flag raised if x not equal to floor(x).
22 /* Prevent math.h from defining a colliding inline */
23 #undef __USE_EXTERN_INLINES
25 #include "math_private.h"
27 static const double huge = 1.0e300;
29 double floor(double x)
33 EXTRACT_WORDS(i0,i1,x);
34 _j0 = ((i0>>20)&0x7ff)-0x3ff;
36 if(_j0<0) { /* raise inexact if x != 0 */
37 if(huge+x>0.0) {/* return 0*sign(x) if |x|<1 */
39 else if(((i0&0x7fffffff)|i1)!=0)
40 { i0=0xbff00000;i1=0;}
43 i = (0x000fffff)>>_j0;
44 if(((i0&i)|i1)==0) return x; /* x is integral */
45 if(huge+x>0.0) { /* raise inexact flag */
46 if(i0<0) i0 += (0x00100000)>>_j0;
51 if(_j0==0x400) return x+x; /* inf or NaN */
52 else return x; /* x is integral */
54 i = ((u_int32_t)(0xffffffff))>>(_j0-20);
55 if((i1&i)==0) return x; /* x is integral */
56 if(huge+x>0.0) { /* raise inexact flag */
61 if(j<i1) i0 +=1 ; /* got a carry */
68 INSERT_WORDS(x,i0,i1);
71 libm_hidden_def(floor)