| Message ID | 1402390928-37048-1-git-send-email-raji@linux.vnet.ibm.com |
|---|---|
| State | New |
| Headers | show |
On Tue, 10 Jun 2014, Rajalakshmi Srinivasaraghavan wrote: > This patch fixes few failures in nearbyintl() where the fraction part > is close to 0.5. > > [BZ #17031] > sysdeps/ieee754/ldbl-128ibm/s_nearbyintl.c: Consider the low > double, adjusted for any remainder from the high double. Please include an appropriate testcase in libm-test.inc (for both nearbyint and rint - both should use the same set of test inputs, differing only in expected exceptions for inexact cases - and inside the "# if LDBL_MANT_DIG > 100" conditional").
diff --git a/NEWS b/NEWS index 622cdbf..eb6b736 100644 --- a/NEWS +++ b/NEWS @@ -19,7 +19,7 @@ Version 2.20 16791, 16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16849, 16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16912, 16915, 16916, 16917, 16922, 16927, 16928, 16932, 16943, 16958, 16965, 16966, - 16967, 16977, 16978, 16984, 16990, 17009. + 16967, 16977, 16978, 16984, 16990, 17009, 17031. * The minimum Linux kernel version that this version of the GNU C Library can be used with is 2.6.32. diff --git a/sysdeps/ieee754/ldbl-128ibm/s_nearbyintl.c b/sysdeps/ieee754/ldbl-128ibm/s_nearbyintl.c index 4e997a6..8f34604 100644 --- a/sysdeps/ieee754/ldbl-128ibm/s_nearbyintl.c +++ b/sysdeps/ieee754/ldbl-128ibm/s_nearbyintl.c @@ -38,6 +38,7 @@ __nearbyintl (long double x) if (fabs (u.d[0].d) < TWO52) { + double xh = u.d[0].d; double high = u.d[0].d; feholdexcept (&env); if (high > 0.0) @@ -52,6 +53,10 @@ __nearbyintl (long double x) high += TWO52; if (high == 0.0) high = -0.0; } + if (u.d[1].d > 0.0 && (xh - high == 0.5)) + high += 1.0; + else if (u.d[1].d < 0.0 && (-(xh - high) == 0.5)) + high -= 1.0; u.d[0].d = high; u.d[1].d = 0.0; math_force_eval (u.d[0]);
This patch fixes few failures in nearbyintl() where the fraction part is close to 0.5. [BZ #17031] sysdeps/ieee754/ldbl-128ibm/s_nearbyintl.c: Consider the low double, adjusted for any remainder from the high double. Signed-off-by: Rajalakshmi Srinivasaraghavan <raji@linux.vnet.ibm.com> --- NEWS | 2 +- sysdeps/ieee754/ldbl-128ibm/s_nearbyintl.c | 5 +++++ 2 files changed, 6 insertions(+), 1 deletion(-)