diff options
Diffstat (limited to 'sysdeps/ieee754/ldbl-128ibm/s_truncl.c')
| -rw-r--r-- | sysdeps/ieee754/ldbl-128ibm/s_truncl.c | 50 |
1 files changed, 11 insertions, 39 deletions
diff --git a/sysdeps/ieee754/ldbl-128ibm/s_truncl.c b/sysdeps/ieee754/ldbl-128ibm/s_truncl.c index df58b64..b7d4bb5 100644 --- a/sysdeps/ieee754/ldbl-128ibm/s_truncl.c +++ b/sysdeps/ieee754/ldbl-128ibm/s_truncl.c @@ -35,50 +35,22 @@ __truncl (long double x) && __builtin_isless (__builtin_fabs (xh), __builtin_inf ()), 1)) { - double orig_xh; - - /* Long double arithmetic, including the canonicalisation below, - only works in round-to-nearest mode. */ - - /* Convert the high double to integer. */ - orig_xh = xh; - hi = ldbl_nearbyint (xh); - - /* Subtract integral high part from the value. */ - xh -= hi; - ldbl_canonicalize (&xh, &xl); - - /* Now convert the low double, adjusted for any remainder from the - high double. */ - lo = ldbl_nearbyint (xh); - - /* Adjust the result when the remainder is non-zero. nearbyint - rounds values to the nearest integer, and values halfway - between integers to the nearest even integer. floorl must - round towards -Inf. */ - xh -= lo; - ldbl_canonicalize (&xh, &xl); - - if (orig_xh < 0.0) + hi = __trunc (xh); + if (hi != xh) { - if (xh > 0.0 || (xh == 0.0 && xl > 0.0)) - lo += 1.0; + /* The high part is not an integer; the low part does not + affect the result. */ + xh = hi; + xl = 0; } else { - if (xh < 0.0 || (xh == 0.0 && xl < 0.0)) - lo -= 1.0; + /* The high part is a nonzero integer. */ + lo = xh > 0 ? __floor (xl) : __ceil (xl); + xh = hi; + xl = lo; + ldbl_canonicalize_int (&xh, &xl); } - - /* Ensure the final value is canonical. In certain cases, - rounding causes hi,lo calculated so far to be non-canonical. */ - xh = hi; - xl = lo; - ldbl_canonicalize (&xh, &xl); - - /* Ensure we return -0 rather than +0 when appropriate. */ - if (orig_xh < 0.0) - xh = -__builtin_fabs (xh); } return ldbl_pack (xh, xl); |