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Fix ldbl-128 j0l spurious underflows (bug 19156).

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My recent addition of more tests for j0 showed up that the ldbl-128
implementation of j0l produces spurious underflow exceptions for
arguments close to 0 (when the result is very close to 1).  This patch
fixes this by just returning the argument in that case.

Tested for mips64 (where it fixes the recently-added tests that were
previously failing).

	[BZ #19156]
	* sysdeps/ieee754/ldbl-128/e_j0l.c (__ieee754_j0l): Return 1 for
	arguments very close to 0.
This commit is contained in:
Joseph Myers 2015-10-21 16:40:20 +00:00
parent 1245e51596
commit 0a90a8f2b9
3 changed files with 9 additions and 1 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2015-10-21 Joseph Myers <joseph@codesourcery.com>
[BZ #19156]
* sysdeps/ieee754/ldbl-128/e_j0l.c (__ieee754_j0l): Return 1 for
arguments very close to 0.
2015-10-21 Chris Metcalf <cmetcalf@ezchip.com>
* sysdeps/unix/sysv/linux/tile/sysdep.h (PSEUDO_END)

2
NEWS
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@ -20,7 +20,7 @@ Version 2.23
18952, 18953, 18956, 18961, 18966, 18967, 18969, 18970, 18977, 18980,
18981, 18982, 18985, 19003, 19007, 19012, 19016, 19018, 19032, 19046,
19049, 19050, 19059, 19071, 19074, 19076, 19077, 19078, 19079, 19085,
19086, 19088, 19094, 19095, 19124, 19125, 19129, 19134, 19137.
19086, 19088, 19094, 19095, 19124, 19125, 19129, 19134, 19137, 19156.
* There is now a --disable-timezone-tools configure option for disabling the
building and installing of the timezone related utilities (zic, zdump, and

2
sysdeps/ieee754/ldbl-128/e_j0l.c
View File

@ -693,6 +693,8 @@ __ieee754_j0l (long double x)
xx = fabsl (x);
if (xx <= 2.0L)
{
if (xx < 0x1p-57L)
return 1.0L;
/* 0 <= x <= 2 */
z = xx * xx;
p = z * z * neval (z, J0_2N, NJ0_2N) / deval (z, J0_2D, NJ0_2D);