diff options
Diffstat (limited to 's_floor.c')
-rw-r--r-- | s_floor.c | 79 |
1 files changed, 0 insertions, 79 deletions
diff --git a/s_floor.c b/s_floor.c deleted file mode 100644 index c55e0b7..0000000 --- a/s_floor.c +++ /dev/null @@ -1,79 +0,0 @@ - -/* @(#)s_floor.c 1.3 95/01/18 */ -/* - * ==================================================== - * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. - * - * Developed at SunSoft, a Sun Microsystems, Inc. business. - * Permission to use, copy, modify, and distribute this - * software is freely granted, provided that this notice - * is preserved. - * ==================================================== - */ - -/* - * ieee_floor(x) - * Return x rounded toward -inf to integral value - * Method: - * Bit twiddling. - * Exception: - * Inexact flag raised if x not equal to ieee_floor(x). - */ - -#include "fdlibm.h" - -#ifdef __STDC__ -static const double huge = 1.0e300; -#else -static double huge = 1.0e300; -#endif - -#ifdef __STDC__ - double ieee_floor(double x) -#else - double ieee_floor(x) - double x; -#endif -{ - int i0,i1,j0; - unsigned i,j; - i0 = __HI(x); - i1 = __LO(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 = ((unsigned)(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); - } - } - __HI(x) = i0; - __LO(x) = i1; - return x; -} |