glibc/sysdeps
Joseph Myers 7d0b257541 Fix ldbl-128 roundl for exponents in [31, 47] (bug 18346).
The implementation of roundl for ldbl-128 involves undefined behavior
for arguments with exponents from 31 to 47 inclusive, from the shift:

      u_int64_t i = -1ULL >> (j0 - 48);

For example, on mips64, this means roundl (0xffffffffffff.8p0L)
wrongly returns its argument, which is not an integer.  A condition
checking for exponents < 31 should actually be checking for exponents
< 48, and this patch makes it do so.  (That condition is for whether
the bit representing 0.5 is in the high 64-bit half of the
floating-point number.  The value 31 might have arisen from an
incorrect conversion of the ldbl-96 version to handle ldbl-128.)

This was originally reported as a GCC libquadmath bug
<https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65757>.

Tested for mips64; also tested for x86_64 and x86 to make sure the new
tests pass there.

	[BZ #18346]
	* sysdeps/ieee754/ldbl-128/s_roundl.c (__roundl): Handle all
	exponents less than 48 as cases where high part of mantissa needs
	examining to determine whether argument is integral.
	* math/libm-test.inc (round_test_data): Add more tests.
2015-04-28 17:27:02 +00:00
..
aarch64 Clean up sysdep-dl-routines variable. 2015-02-06 10:42:08 -08:00
alpha alpha: Update libm-test-ulps 2015-04-06 10:38:16 -07:00
arm ARM: Define PI_STATIC_AND_HIDDEN. 2015-04-24 10:51:49 -07:00
generic Add ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA to x86 2015-03-31 05:16:57 -07:00
gnu hurd: fix unwind-resume.c build 2015-02-08 18:46:00 +01:00
hppa hppa: Fix feupdateenv and fesetexceptflag (Bug 18111). 2015-03-11 02:48:59 -04:00
i386 powerpc: Fix __wcschr static build 2015-04-15 16:01:48 -03:00
ia64 Set errno for log1p on pole/domain error. 2015-04-13 21:19:27 +02:00
ieee754 Fix ldbl-128 roundl for exponents in [31, 47] (bug 18346). 2015-04-28 17:27:02 +00:00
init_array NPTL: Initializer for .init_array-only configurations. 2015-02-13 13:19:11 -08:00
m68k Set errno for log1p on pole/domain error. 2015-04-13 21:19:27 +02:00
mach Fix warnings 2015-03-21 04:49:44 +01:00
microblaze Replace ELF_RTYPE_CLASS_NOCOPY with ELF_RTYPE_CLASS_COPY 2015-03-05 08:40:41 -08:00
mips 2015-02-18 Steve Ellcey <sellcey@imgtec.com> 2015-02-18 10:51:37 -08:00
nacl Add arm-nacl port. 2015-04-17 09:02:19 -07:00
nios2 Replace ELF_RTYPE_CLASS_NOCOPY with ELF_RTYPE_CLASS_COPY 2015-03-05 08:40:41 -08:00
nptl NPTL: Remove duplicate definition of PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP 2015-03-28 01:50:12 -04:00
posix linux: open and openat ignore 'mode' with O_TMPFILE in flags 2015-02-24 13:19:22 +05:30
powerpc libc-vdso.h place consolidation 2015-04-20 08:51:17 -03:00
pthread Fix aio_error thread-safety. 2015-03-06 11:32:24 +01:00
s390 S/390: Regenerate ULPs 2015-04-24 13:37:48 +02:00
sh Replace ELF_RTYPE_CLASS_NOCOPY with ELF_RTYPE_CLASS_COPY 2015-03-05 08:40:41 -08:00
sparc Sparc memchr/memcmp/strncmp fixes from Il'ya Malakhov. 2015-04-17 10:26:14 -07:00
tile tile: Enable PI_STATIC_AND_HIDDEN 2015-04-16 09:40:21 -04:00
unix Update sparc localplt.data 2015-04-27 14:53:13 -07:00
wordsize-32 Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
wordsize-64 Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
x86 Fix atan / atan2 missing underflows (bug 15319). 2015-02-18 21:10:49 +00:00
x86_64 Set errno for log1p on pole/domain error. 2015-04-13 21:19:27 +02:00