diff options
Diffstat (limited to 'sysdeps/ieee754/dbl-64/s_nearbyint.c')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/s_nearbyint.c | 63 |
1 files changed, 35 insertions, 28 deletions
diff --git a/sysdeps/ieee754/dbl-64/s_nearbyint.c b/sysdeps/ieee754/dbl-64/s_nearbyint.c index 5017f471d2..dec0c5d6ee 100644 --- a/sysdeps/ieee754/dbl-64/s_nearbyint.c +++ b/sysdeps/ieee754/dbl-64/s_nearbyint.c @@ -29,40 +29,47 @@ static char rcsid[] = "$NetBSD: s_rint.c,v 1.8 1995/05/10 20:48:04 jtc Exp $"; #include <math_private.h> static const double -TWO52[2]={ + TWO52[2] = { 4.50359962737049600000e+15, /* 0x43300000, 0x00000000 */ -4.50359962737049600000e+15, /* 0xC3300000, 0x00000000 */ }; -double __nearbyint(double x) +double +__nearbyint (double x) { - fenv_t env; - int32_t i0,j0,sx; - double w,t; - GET_HIGH_WORD(i0,x); - sx = (i0>>31)&1; - j0 = ((i0>>20)&0x7ff)-0x3ff; - if(j0<52) { - if(j0<0) { - libc_feholdexcept (&env); - w = TWO52[sx]+x; - t = w-TWO52[sx]; - math_force_eval (t); - libc_fesetenv (&env); - GET_HIGH_WORD(i0,t); - SET_HIGH_WORD(t,(i0&0x7fffffff)|(sx<<31)); - return t; - } - } else { - if(j0==0x400) return x+x; /* inf or NaN */ - else return x; /* x is integral */ + fenv_t env; + int32_t i0, j0, sx; + double w, t; + GET_HIGH_WORD (i0, x); + sx = (i0 >> 31) & 1; + j0 = ((i0 >> 20) & 0x7ff) - 0x3ff; + if (j0 < 52) + { + if (j0 < 0) + { + libc_feholdexcept (&env); + w = TWO52[sx] + x; + t = w - TWO52[sx]; + math_force_eval (t); + libc_fesetenv (&env); + GET_HIGH_WORD (i0, t); + SET_HIGH_WORD (t, (i0 & 0x7fffffff) | (sx << 31)); + return t; } - libc_feholdexcept (&env); - w = TWO52[sx]+x; - t = w-TWO52[sx]; - math_force_eval (t); - libc_fesetenv (&env); - return t; + } + else + { + if (j0 == 0x400) + return x + x; /* inf or NaN */ + else + return x; /* x is integral */ + } + libc_feholdexcept (&env); + w = TWO52[sx] + x; + t = w - TWO52[sx]; + math_force_eval (t); + libc_fesetenv (&env); + return t; } weak_alias (__nearbyint, nearbyint) #ifdef NO_LONG_DOUBLE |