diff options
Diffstat (limited to 'REORG.TODO/sysdeps/ieee754/dbl-64/wordsize-64/s_nearbyint.c')
| -rw-r--r-- | REORG.TODO/sysdeps/ieee754/dbl-64/wordsize-64/s_nearbyint.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/ieee754/dbl-64/wordsize-64/s_nearbyint.c b/REORG.TODO/sysdeps/ieee754/dbl-64/wordsize-64/s_nearbyint.c new file mode 100644 index 0000000000..8293819981 --- /dev/null +++ b/REORG.TODO/sysdeps/ieee754/dbl-64/wordsize-64/s_nearbyint.c @@ -0,0 +1,66 @@ +/* Adapted for use as nearbyint by Ulrich Drepper <drepper@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. + * ==================================================== + */ + +/* + * rint(x) + * Return x rounded to integral value according to the prevailing + * rounding mode. + * Method: + * Using floating addition. + * Exception: + * Inexact flag raised if x not equal to rint(x). + */ + +#include <fenv.h> +#include <math.h> +#include <math_private.h> + +static const double +TWO52[2]={ + 4.50359962737049600000e+15, /* 0x43300000, 0x00000000 */ + -4.50359962737049600000e+15, /* 0xC3300000, 0x00000000 */ +}; + +double +__nearbyint(double x) +{ + fenv_t env; + int64_t i0,sx; + int32_t j0; + EXTRACT_WORDS64(i0,x); + sx = (i0>>63)&1; + j0 = ((i0>>52)&0x7ff)-0x3ff; + if(__builtin_expect(j0<52, 1)) { + if(j0<0) { + libc_feholdexcept (&env); + double w = TWO52[sx]+x; + double t = w-TWO52[sx]; + math_opt_barrier(t); + libc_fesetenv (&env); + return __copysign (t, x); + } + } else { + if(j0==0x400) return x+x; /* inf or NaN */ + else return x; /* x is integral */ + } + libc_feholdexcept (&env); + double w = TWO52[sx]+x; + double t = w-TWO52[sx]; + math_opt_barrier (t); + libc_fesetenv (&env); + return t; +} +weak_alias (__nearbyint, nearbyint) +#ifdef NO_LONG_DOUBLE +strong_alias (__nearbyint, __nearbyintl) +weak_alias (__nearbyint, nearbyintl) +#endif |