GNU C Library master sources branch master updated. glibc-2.22-447-g0a90a8f

jsm28@sourceware.org jsm28@sourceware.org
Wed Oct 21 16:40:00 GMT 2015


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- Log -----------------------------------------------------------------
http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=0a90a8f2b9af6dd226558df5d3825e0e9ccd4ce3

commit 0a90a8f2b9af6dd226558df5d3825e0e9ccd4ce3
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Oct 21 16:40:20 2015 +0000

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

diff --git a/ChangeLog b/ChangeLog
index f2422ed..bc95bda 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -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)
diff --git a/NEWS b/NEWS
index 1313ab2..de3a233 100644
--- a/NEWS
+++ b/NEWS
@@ -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
diff --git a/sysdeps/ieee754/ldbl-128/e_j0l.c b/sysdeps/ieee754/ldbl-128/e_j0l.c
index 1320de7..c208916 100644
--- a/sysdeps/ieee754/ldbl-128/e_j0l.c
+++ b/sysdeps/ieee754/ldbl-128/e_j0l.c
@@ -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);

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                        |    6 ++++++
 NEWS                             |    2 +-
 sysdeps/ieee754/ldbl-128/e_j0l.c |    2 ++
 3 files changed, 9 insertions(+), 1 deletions(-)


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