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| author | Rajalakshmi Srinivasaraghavan <raji@linux.vnet.ibm.com> | 2014-06-17 08:46:25 -0500 |
|---|---|---|
| committer | Adhemerval Zanella <azanella@linux.vnet.ibm.com> | 2014-08-28 09:25:47 -0400 |
| commit | 7e986751f5c05f3363c01c717972f87a681da0d0 (patch) | |
| tree | 78781ababa253591ec22c8fe9f1b9d82bbd48d50 | |
| parent | 2289a56644fc05786e2d5637c76d47afea7d38b9 (diff) | |
| download | glibc-7e986751f5c05f3363c01c717972f87a681da0d0.tar.gz | |
PowerPC: Fix nearbyintl failure for few inputs
This patch fixes few failures in nearbyintl() where the fraction part is
close to 0.5.i The new tests added report few extra failures in
nearbyint_downward and nearbyint_towardzero which is a known issue.
Fixes #17031.
This is a backport of 754c5a08aacb44895d1ab97c553ce424eb43f761.
| -rw-r--r-- | ChangeLog | 8 | ||||
| -rw-r--r-- | NEWS | 3 | ||||
| -rw-r--r-- | math/libm-test.inc | 8 | ||||
| -rw-r--r-- | sysdeps/ieee754/ldbl-128ibm/s_nearbyintl.c | 5 |
4 files changed, 23 insertions, 1 deletions
@@ -1,3 +1,11 @@ +2014-16-17 Rajalakshmi Srinivasaraghavan <raji@linux.vnet.ibm.com> + + [BZ #17031] + * sysdeps/ieee754/ldbl-128ibm/s_nearbyintl.c: Consider the low + double, adjusted for any remainder from the high double. + * math/libm-test.inc (nearbyint): Add tests. + (rint): Likewise. + 2014-06-11 Vidya Ranganathan <vidya@linux.vnet.ibm.com> * sysdeps/powerpc/powerpc64/power7/strcmp.S: New file: Optimization. @@ -9,7 +9,8 @@ Version 2.19.1 * The following bugs are resolved with this release: - 16545, 16683, 16689, 16701, 16706, 16707, 16739, 16815, 16619, 16740. + 16545, 16683, 16689, 16701, 16706, 16707, 16739, 16815, 16619, 16740, + 17031. Version 2.19 diff --git a/math/libm-test.inc b/math/libm-test.inc index 1c5c022f4f..848b89ee7b 100644 --- a/math/libm-test.inc +++ b/math/libm-test.inc @@ -10519,6 +10519,10 @@ static const struct test_f_f_data nearbyint_test_data[] = TEST_f_f (nearbyint, 34503599627370498.515625L, 34503599627370499.0L), TEST_f_f (nearbyint, -34503599627370498.515625L, -34503599627370499.0L), # if LDBL_MANT_DIG >= 106 + TEST_f_f (nearbyint, 1024.5000000000001L, 1025.0L, NO_INEXACT_EXCEPTION), + TEST_f_f (nearbyint, 1025.5000000000001L, 1026.0L, NO_INEXACT_EXCEPTION), + TEST_f_f (nearbyint, -1024.5000000000001L, -1025.0L, NO_INEXACT_EXCEPTION), + TEST_f_f (nearbyint, -1025.5000000000001L, -1026.0L, NO_INEXACT_EXCEPTION), TEST_f_f (nearbyint, 1192568192774434123539907640624.484375L, 1192568192774434123539907640624.0L), TEST_f_f (nearbyint, -1192568192774434123539907640624.484375L, -1192568192774434123539907640624.0L), # endif @@ -11335,6 +11339,10 @@ static const struct test_f_f_data rint_test_data[] = TEST_f_f (rint, 4503599627370497.5L, 4503599627370498.0L, INEXACT_EXCEPTION), # if LDBL_MANT_DIG > 100 + TEST_f_f (rint, 1024.5000000000001L, 1025.0L, INEXACT_EXCEPTION), + TEST_f_f (rint, 1025.5000000000001L, 1026.0L, INEXACT_EXCEPTION), + TEST_f_f (rint, -1024.5000000000001L, -1025.0L, INEXACT_EXCEPTION), + TEST_f_f (rint, -1025.5000000000001L, -1026.0L, INEXACT_EXCEPTION), TEST_f_f (rint, 4503599627370494.5000000000001L, 4503599627370495.0L, INEXACT_EXCEPTION), TEST_f_f (rint, 4503599627370495.5000000000001L, 4503599627370496.0L, INEXACT_EXCEPTION), TEST_f_f (rint, 4503599627370496.5000000000001L, 4503599627370497.0L, INEXACT_EXCEPTION), diff --git a/sysdeps/ieee754/ldbl-128ibm/s_nearbyintl.c b/sysdeps/ieee754/ldbl-128ibm/s_nearbyintl.c index 4e997a68f9..8f34604f54 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]); |