URL
https://opencores.org/ocsvn/openrisc_2011-10-31/openrisc_2011-10-31/trunk
Subversion Repositories openrisc_2011-10-31
[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libm/] [math/] [sf_floor.c] - Rev 232
Go to most recent revision | Compare with Previous | Blame | View Log
/* sf_floor.c -- float version of s_floor.c. * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. */ /* * ==================================================== * 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. * ==================================================== */ /* * floorf(x) * Return x rounded toward -inf to integral value * Method: * Bit twiddling. * Exception: * Inexact flag raised if x not equal to floorf(x). */ #include "fdlibm.h" #ifdef __STDC__ static const float huge = 1.0e30; #else static float huge = 1.0e30; #endif #ifdef __STDC__ float floorf(float x) #else float floorf(x) float x; #endif { __int32_t i0,j0; __uint32_t i,ix; GET_FLOAT_WORD(i0,x); ix = (i0&0x7fffffff); j0 = (ix>>23)-0x7f; if(j0<23) { if(j0<0) { /* raise inexact if x != 0 */ if(huge+x>(float)0.0) {/* return 0*sign(x) if |x|<1 */ if(i0>=0) {i0=0;} else if(!FLT_UWORD_IS_ZERO(ix)) { i0=0xbf800000;} } } else { i = (0x007fffff)>>j0; if((i0&i)==0) return x; /* x is integral */ if(huge+x>(float)0.0) { /* raise inexact flag */ if(i0<0) i0 += (0x00800000)>>j0; i0 &= (~i); } } } else { if(!FLT_UWORD_IS_FINITE(ix)) return x+x; /* inf or NaN */ else return x; /* x is integral */ } SET_FLOAT_WORD(x,i0); return x; } #ifdef _DOUBLE_IS_32BITS #ifdef __STDC__ double floor(double x) #else double floor(x) double x; #endif { return (double) floorf((float) x); } #endif /* defined(_DOUBLE_IS_32BITS) */
Go to most recent revision | Compare with Previous | Blame | View Log