diff options
Diffstat (limited to 'sysdeps/ieee754/dbl-64')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/wordsize-64/s_ceil.c | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/sysdeps/ieee754/dbl-64/wordsize-64/s_ceil.c b/sysdeps/ieee754/dbl-64/wordsize-64/s_ceil.c new file mode 100644 index 0000000000..9123fdc7bd --- /dev/null +++ b/sysdeps/ieee754/dbl-64/wordsize-64/s_ceil.c @@ -0,0 +1,67 @@ +/* @(#)s_ceil.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. + * ==================================================== + */ + +/* + * ceil(x) + * Return x rounded toward -inf to integral value + * Method: + * Bit twiddling. + * Exception: + * Inexact flag raised if x not equal to ceil(x). + */ + +#include "math.h" +#include "math_private.h" + +#ifdef __STDC__ +static const double huge = 1.0e300; +#else +static double huge = 1.0e300; +#endif + +#ifdef __STDC__ + double __ceil(double x) +#else + double __ceil(x) + double x; +#endif +{ + int64_t i0,i; + int32_t j0; + EXTRACT_WORDS64(i0,x); + j0 = ((i0>>52)&0x7ff)-0x3ff; + if(j0<=51) { + if(j0<0) { /* raise inexact if x != 0 */ + if(huge+x>0.0) {/* return 0*sign(x) if |x|<1 */ + if(i0<0) {i0=INT64_C(0x8000000000000000);} + else if(i0!=0) { i0=INT64_C(0x3ff0000000000000);} + } + } else { + i = INT64_C(0x000fffffffffffff)>>j0; + if((i0&i)==0) return x; /* x is integral */ + if(huge+x>0.0) { /* raise inexact flag */ + if(i0>0) i0 += UINT64_C(0x0010000000000000)>>j0; + i0 &= (~i); + } + } + } else { + if(j0==0x400) return x+x; /* inf or NaN */ + else return x; /* x is integral */ + } + INSERT_WORDS64(x,i0); + return x; +} +weak_alias (__ceil, ceil) +#ifdef NO_LONG_DOUBLE +strong_alias (__ceil, __ceill) +weak_alias (__ceil, ceill) +#endif |