summary refs log tree commit diff
path: root/NEWS
diff options
context:
space:
mode:
authorJoseph Myers <joseph@codesourcery.com>2015-10-02 17:11:13 +0000
committerJoseph Myers <joseph@codesourcery.com>2015-10-02 17:11:13 +0000
commit59a63cca1133a8e1e3219970ee95979ac1f810df (patch)
treea4fc7c389f60647377479748d75bcc94f3c36547 /NEWS
parentef6b619f73e49b6d87c7530e6e9f8a59723b492d (diff)
downloadglibc-59a63cca1133a8e1e3219970ee95979ac1f810df.tar.gz
glibc-59a63cca1133a8e1e3219970ee95979ac1f810df.tar.xz
glibc-59a63cca1133a8e1e3219970ee95979ac1f810df.zip
Fix nexttoward overflow in non-default rounding modes (bug 19059).
ISO C requires overflowing results from nexttoward to be the
appropriate infinity independent of the rounding mode, but some
implementations use a rounding-mode-dependent result (this is the same
issue as was fixed for nextafter in bug 16677).  This patch fixes the
problem by making the nexttoward implementations discard the result
from the floating-point computation that forced an overflow exception
and then return the infinity previously computed with integer
arithmetic.

Tested for x86_64, x86, mips64 and powerpc.

	[BZ #19059]
	* math/s_nexttowardf.c (__nexttowardf): Do not return value from
	overflowing computation.
	* sysdeps/i386/fpu/s_nexttoward.c (__nexttoward): Likewise.
	* sysdeps/i386/fpu/s_nexttowardf.c (__nexttowardf): Likewise.
	* sysdeps/ieee754/ldbl-128/s_nexttoward.c (__nexttoward):
	Likewise.
	* sysdeps/ieee754/ldbl-128/s_nexttowardf.c (__nexttowardf):
	Likewise.
	* sysdeps/ieee754/ldbl-128ibm/s_nexttoward.c (__nexttoward):
	Likewise.
	* sysdeps/ieee754/ldbl-128ibm/s_nexttowardf.c (__nexttowardf):
	Likewise.
	* sysdeps/ieee754/ldbl-96/s_nexttoward.c (__nexttoward): Likewise.
	* sysdeps/ieee754/ldbl-96/s_nexttowardf.c (__nexttowardf):
	Likewise.
	* sysdeps/ieee754/ldbl-opt/s_nexttowardfd.c (__nldbl_nexttowardf):
	Likewise.
	* math/libm-test.inc (nexttoward_test_data): Add more tests.
Diffstat (limited to 'NEWS')
-rw-r--r--NEWS2
1 files changed, 1 insertions, 1 deletions
diff --git a/NEWS b/NEWS
index 4634b74ebf..05d962221b 100644
--- a/NEWS
+++ b/NEWS
@@ -17,7 +17,7 @@ Version 2.23
   18778, 18781, 18787, 18789, 18790, 18795, 18796, 18803, 18820, 18823,
   18824, 18825, 18857, 18863, 18870, 18872, 18873, 18875, 18887, 18921,
   18951, 18952, 18956, 18961, 18966, 18967, 18969, 18970, 18977, 18980,
-  18981, 18985, 19003, 19016, 19032, 19046.
+  18981, 18985, 19003, 19016, 19032, 19046, 19059.
 
 * The obsolete header <regexp.h> has been removed.  Programs that require
   this header must be updated to use <regex.h> instead.