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Quelle s_floor.cpp Sprache: C |
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/* @(#)s_floor.c 5.1 93/09/24 */
/* * ==================================================== * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. * * Developed at SunPro, a Sun Microsystems, Inc. business. * Permission to use, copy, modify, and distribute this * software is freely granted, provided that this notice * is preserved. * ==================================================== */ //#include <sys/cdefs.h> //__FBSDID("$FreeBSD$"); /* * floor(x) * Return x rounded toward -inf to integral value * Method: * Bit twiddling. * Exception: * Inexact flag raised if x not equal to floor(x). */ #include <float.h> #include "math_private.h" static const double huge = 1.0e300; double floor(double x) { int32_t i0,i1,j0; u_int32_t i,j; EXTRACT_WORDS(i0,i1,x); j0 = ((i0>>20)&0x7ff)-0x3ff; if(j0<20) { if(j0<0) { /* raise inexact if x != 0 */ if(huge+x>0.0) {/* return 0*sign(x) if |x|<1 */ if(i0>=0) {i0=i1=0;} else if(((i0&0x7fffffff)|i1)!=0) { i0=0xbff00000;i1=0;} } } else { i = (0x000fffff)>>j0; if(((i0&i)|i1)==0) return x; /* x is integral */ if(huge+x>0.0) { /* raise inexact flag */ if(i0<0) i0 += (0x00100000)>>j0; i0 &= (~i); i1=0; } } } else if (j0>51) { if(j0==0x400) return x+x; /* inf or NaN */ else return x; /* x is integral */ } else { i = ((u_int32_t)(0xffffffff))>>(j0-20); if((i1&i)==0) return x; /* x is integral */ if(huge+x>0.0) { /* raise inexact flag */ if(i0<0) { if(j0==20) i0+=1; else { j = i1+(1<<(52-j0)); if(j<i1) i0 +=1 ; /* got a carry */ i1=j; } } i1 &= (~i); } } INSERT_WORDS(x,i0,i1); return x; } ¤ Dauer der Verarbeitung: 0.28 Sekunden (vorverarbeitet) ¤*© Formatika GbR, Deutschland |
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2026-03-28