This is the mail archive of the glibc-cvs@sourceware.org mailing list for the glibc project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

GNU C Library master sources branch master updated. glibc-2.17-470-gfbbe2b9


This is an automated email from the git hooks/post-receive script. It was
generated because a ref change was pushed to the repository containing
the project "GNU C Library master sources".

The branch, master has been updated
       via  fbbe2b9a1f04c00ea0f8820a545bd4ca780ffa30 (commit)
      from  7a86be6e5f18ba99b25d75c555ce56fe1fcea325 (commit)

Those revisions listed above that are new to this repository have
not appeared on any other notification email; so we list those
revisions in full, below.

- Log -----------------------------------------------------------------
http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=fbbe2b9a1f04c00ea0f8820a545bd4ca780ffa30

commit fbbe2b9a1f04c00ea0f8820a545bd4ca780ffa30
Author: Adhemerval Zanella <azanella@linux.vnet.ibm.com>
Date:   Thu Mar 28 09:52:48 2013 -0300

    Fix e_logl (128ibm) spurious underflow

diff --git a/ChangeLog b/ChangeLog
index 7c1543c..390c5cb 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2013-03-28  Adhemerval Zanella  <azanella@linux.vnet.ibm.com>
+
+	[BZ #15214]
+	* sysdeps/ieee754/ldbl-128ibm/e_logl.c (__ieee754_logl): Fix spurious
+	underflow.
+	* sysdeps/powerpc/fpu/libm-test-ulps: Update.
+
 2013-03-28  Siddhesh Poyarekar  <siddhesh@redhat.com>
 
 	[BZ #15304]
diff --git a/NEWS b/NEWS
index 0902478..0682b19 100644
--- a/NEWS
+++ b/NEWS
@@ -11,8 +11,8 @@ Version 2.18
 
   11120, 11561, 12723, 13550, 13889, 13951, 14142, 14176, 14200, 14317,
   14327, 14496, 14812, 14920, 14964, 14981, 14982, 14985, 14994, 14996,
-  15003, 15006, 15020, 15023, 15036, 15054, 15055, 15062, 15078, 15160,
-  15232, 15234, 15283, 15285, 15287, 15304, 15307.
+  15003, 15006, 15020, 15023, 15036, 15054, 15055, 15062, 15078, 15124,
+  15160, 15232, 15234, 15283, 15285, 15287, 15304, 15307.
 
 * Add support for calling C++11 thread_local object destructors on thread
   and program exit.  This needs compiler support for offloading C++11
diff --git a/sysdeps/ieee754/ldbl-128ibm/e_logl.c b/sysdeps/ieee754/ldbl-128ibm/e_logl.c
index 14f47eb..15b5edf 100644
--- a/sysdeps/ieee754/ldbl-128ibm/e_logl.c
+++ b/sysdeps/ieee754/ldbl-128ibm/e_logl.c
@@ -182,6 +182,9 @@ static const long double
   ln2a = 6.93145751953125e-1L,
   ln2b = 1.4286068203094172321214581765680755001344E-6L;
 
+static const long double
+  ldbl_epsilon = 0x1p-106L;
+
 long double
 __ieee754_logl(long double x)
 {
@@ -258,7 +261,12 @@ __ieee754_logl(long double x)
     }
   /* Series expansion of log(1+z).  */
   w = z * z;
-  y = ((((((((((((l15 * z
+  /* Avoid spurious underflows.  */
+  if (__glibc_unlikely(w <= ldbl_epsilon))
+    y = 0.0L;
+  else
+    {
+      y = ((((((((((((l15 * z
 		  + l14) * z
 		 + l13) * z
 		+ l12) * z
@@ -271,7 +279,8 @@ __ieee754_logl(long double x)
 	 + l5) * z
 	+ l4) * z
        + l3) * z * w;
-  y -= 0.5 * w;
+      y -= 0.5 * w;
+    }
   y += e * ln2b;  /* Base 2 exponent offset times ln(2).  */
   y += z;
   y += logtbl[k-26]; /* log(t) - (t-1) */
diff --git a/sysdeps/powerpc/fpu/libm-test-ulps b/sysdeps/powerpc/fpu/libm-test-ulps
index 4221967..5072190 100644
--- a/sysdeps/powerpc/fpu/libm-test-ulps
+++ b/sysdeps/powerpc/fpu/libm-test-ulps
@@ -243,9 +243,11 @@ idouble: 1
 Test "Real part of: cacos (-0.5 + +0 i) == 2.094395102393195492308428922186335256131 - 0 i":
 double: 1
 idouble: 1
+ldouble: 1
 Test "Real part of: cacos (-0.5 - 0 i) == 2.094395102393195492308428922186335256131 + +0 i":
 double: 1
 idouble: 1
+ldouble: 1
 Test "Imaginary part of: cacos (-1.5 + +0 i) == pi - 0.9624236501192068949955178268487368462704 i":
 double: 1
 float: 1
@@ -265,6 +267,10 @@ double: 1
 float: 1
 idouble: 1
 ifloat: 1
+Test "Imaginary part of: cacos (0x1.fp1023 + 0x1.fp1023 i) == 7.853981633974483096156608458198757210493e-1 - 7.107906849659093345062145442726115449315e2 i":
+ldouble: 1
+Test "Imaginary part of: cacos (0x1.fp127 + 0x1.fp127 i) == 7.853981633974483096156608458198757210493e-1 - 8.973081118419833726837456344608533993585e1 i":
+ldouble: 1
 
 # cacosh
 Test "Real part of: cacosh (+0 + 0.5 i) == 0.4812118250596034474977589134243684231352 + pi/2 i":

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

Summary of changes:
 ChangeLog                            |    7 +++++++
 NEWS                                 |    4 ++--
 sysdeps/ieee754/ldbl-128ibm/e_logl.c |   13 +++++++++++--
 sysdeps/powerpc/fpu/libm-test-ulps   |    6 ++++++
 4 files changed, 26 insertions(+), 4 deletions(-)


hooks/post-receive
-- 
GNU C Library master sources


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]