diff -r 000000000000 -r bde4ae8d615e os/ossrv/genericopenlibs/cstdlib/LMATH/S_FLOOR.C --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/os/ossrv/genericopenlibs/cstdlib/LMATH/S_FLOOR.C Fri Jun 15 03:10:57 2012 +0200 @@ -0,0 +1,133 @@ +/* S_FLOOR.C + * + * Portions Copyright (c) 1993-2005 Nokia Corporation and/or its subsidiary(-ies). + * All rights reserved. + */ + + +/* @(#)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. + * ==================================================== + */ + +/* +FUNCTION +<>, <>, <>, <>---floor and ceiling +INDEX + floor +INDEX + floorf +INDEX + ceil +INDEX + ceilf + +ANSI_SYNOPSIS + #include + double floor(double <[x]>); + float floorf(float <[x]>); + double ceil(double <[x]>); + float ceilf(float <[x]>); + +TRAD_SYNOPSIS + #include + double floor(<[x]>) + double <[x]>; + float floorf(<[x]>) + float <[x]>; + double ceil(<[x]>) + double <[x]>; + float ceilf(<[x]>) + float <[x]>; + +DESCRIPTION +<> and <> find +@tex +$\lfloor x \rfloor$, +@end tex +the nearest integer less than or equal to <[x]>. +<> and <> find +@tex +$\lceil x\rceil$, +@end tex +the nearest integer greater than or equal to <[x]>. + +RETURNS +<> and <> return the integer result as a double. +<> and <> return the integer result as a float. + +PORTABILITY +<> and <> are ANSI. +<> and <> are extensions. + + +*/ + +/* + * 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 "FDLIBM.H" + +static const double huge = 1.0e300; + +/** +Round down value. +Returns the largest integer that is less than or equal to x +@return Floor of x. +@param x Floating point value +*/ +EXPORT_C double floor(double x) __SOFTFP +{ + __int32_t i0,i1,j0; + __uint32_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 = ((__uint32_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