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glibc/sysdeps/ieee754
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Joseph Myers 59a63cca11 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.
2015-10-02 17:11:13 +00:00
..
bits Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
dbl-64 Fix clog, clog10 inaccuracy (bug 19016). 2015-09-28 22:11:22 +00:00
flt-32 Fix powf inaccuracy (bug 18956). 2015-09-26 00:27:06 +00:00
ldbl-64-128 Make scalbn set errno (bug 6803). 2015-09-16 21:11:00 +00:00
ldbl-96 Fix nexttoward overflow in non-default rounding modes (bug 19059). 2015-10-02 17:11:13 +00:00
ldbl-128 Fix nexttoward overflow in non-default rounding modes (bug 19059). 2015-10-02 17:11:13 +00:00
ldbl-128ibm Fix nexttoward overflow in non-default rounding modes (bug 19059). 2015-10-02 17:11:13 +00:00
ldbl-opt Fix nexttoward overflow in non-default rounding modes (bug 19059). 2015-10-02 17:11:13 +00:00
ieee754.h Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
k_standard.c Add comment to CSTR macro in k_standard.c. 2015-02-27 01:12:19 +00:00
k_standardf.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
k_standardl.c Fix spurious "inexact" exceptions from __kernel_standard_l (bug 18245, bug 18583). 2015-06-23 17:26:46 +00:00
Makefile Avoid -Wno-write-strings for k_standard.c. 2015-02-26 22:50:54 +00:00
s_lib_version.c Remove trailing whitespace. 2013-06-05 20:44:03 +00:00
s_matherr.c Use <> for math.h and math_private.h everywhere. 2012-03-09 16:09:10 -08:00
s_signgam.c Use <> for math.h and math_private.h everywhere. 2012-03-09 16:09:10 -08:00