glibc/sysdeps
Joseph Myers c091488e51 Fix ldbl-128ibm powl overflow handling (bug 19674).
The ldbl-128ibm implementation of powl has some problems in the case
of overflow or underflow, which are mainly visible in non-default
rounding modes.

* When overflow or underflow is detected early, the correct sign of an
  overflowing or underflowing result is not allowed for.  This is
  mostly hidden in the default rounding mode by the errno-setting
  wrappers recomputing the result (except in non-default
  error-handling modes such as -lieee), but visible in other rounding
  modes where a result that is not zero or infinity causes the
  wrappers not to do the recomputation.

* The final scaling is done before the sign is incorporated in the
  result, but should be done afterwards for correct overflowing and
  underflowing results in directed rounding modes.

This patch fixes those problems.  Tested for powerpc.

	[BZ #19674]
	* sysdeps/ieee754/ldbl-128ibm/e_powl.c (__ieee754_powl): Include
	sign in overflowing and underflowing results when overflow or
	underflow is detected early.  Include sign in result before rather
	than after scaling.
2016-02-19 01:07:40 +00:00
..
aarch64 Add _STRING_INLINE_unaligned and string_private.h 2016-02-18 14:55:29 -02:00
alpha Update Alpha libm-test-ulps 2016-01-25 10:43:41 -08:00
arm Fix ulps regeneration for *-finite tests. 2016-01-19 21:42:58 +00:00
generic Add _STRING_INLINE_unaligned and string_private.h 2016-02-18 14:55:29 -02:00
gnu Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
hppa hppa: fix dladdr [BZ #19415] 2016-01-08 02:19:26 -05:00
i386 Make shebang interpreter directives consistent 2016-01-07 04:03:21 -05:00
ia64 Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
ieee754 Fix ldbl-128ibm powl overflow handling (bug 19674). 2016-02-19 01:07:40 +00:00
init_array Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
m68k Add _STRING_INLINE_unaligned and string_private.h 2016-02-18 14:55:29 -02:00
mach Update copyright dates committed in 2016 2016-01-06 14:03:10 -08:00
microblaze Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
mips Fix MIPS64 memcpy regression. 2016-01-28 01:52:05 +00:00
nacl NaCl: Fix unused variable errors in lowlevellock-futex.h macros. 2016-01-20 13:57:14 -08:00
nios2 Maintainence patch for nios2: update ULPS file and localplt.data changes. 2016-01-21 22:58:03 -08:00
nptl New pthread_barrier algorithm to fulfill barrier destruction requirements. 2016-01-15 21:20:34 +01:00
posix Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
powerpc powerpc: Regenerate libm-test-ulps 2016-02-04 16:40:54 -02:00
pthread Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
s390 Add _STRING_INLINE_unaligned and string_private.h 2016-02-18 14:55:29 -02:00
sh Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sparc Add _STRING_INLINE_unaligned and string_private.h 2016-02-18 14:55:29 -02:00
tile Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
unix Fix MIPS mmap negative offset handling for consistency (bug 19550). 2016-02-01 18:20:21 +00:00
wordsize-32 Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
wordsize-64 Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
x86 Add _STRING_INLINE_unaligned and string_private.h 2016-02-18 14:55:29 -02:00
x86_64 Use PIC relocation in ALIAS_IMPL 2016-02-17 14:23:32 -08:00