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913d03c864
glibc/sysdeps/x86_64/fpu
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Joseph Myers 913d03c864 Fix acosh (1) in round-downward mode (bug 16927). 
According to C99 and C11 Annex F, acosh (1) should be +0 in all
rounding modes.  However, some implementations in glibc wrongly return
-0 in round-downward mode (which is what you get if you end up
computing log1p (-0), via 1 - 1 being -0 in round-downward mode).
This patch fixes the problem implementations, by correcting the test
for an exact 1 value in the ldbl-96 implementation to allow for the
explicit high bit of the mantissa, and by inserting fabs instructions
in the i386 implementations; tests of acosh are duly converted to
ALL_RM_TEST.  I believe all the other sysdeps/ieee754 implementations
are already OK (I haven't checked the ia64 versions, but if buggy then
that will be obvious from the results of test runs after this patch is
in).

Tested x86_64 and x86 and ulps updated accordingly.

	[BZ #16927]
	* sysdeps/i386/fpu/e_acosh.S (__ieee754_acosh): Use fabs on x-1
	value.
	* sysdeps/i386/fpu/e_acoshf.S (__ieee754_acoshf): Likewise.
	* sysdeps/i386/fpu/e_acoshl.S (__ieee754_acoshl): Likewise.
	* sysdeps/ieee754/ldbl-96/e_acoshl.c (__ieee754_acoshl): Correct
	for explicit high bit of mantissa when testing for argument equal
	to 1.
	* math/libm-test.inc (acosh_test): Use ALL_RM_TEST.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2014-05-14 12:35:40 +00:00
..
multiarch Fix implicit __isinf declarations in exp. 2014-03-24 22:00:32 +00:00
dla.h Better DLA_FMS 2011-10-24 22:11:21 -04:00
e_acosl.c Update. 2001-09-19 10:37:31 +00:00
e_atan2l.c Update. 2001-09-19 10:37:31 +00:00
e_exp2l.S Optimize libm 2011-10-12 11:27:51 -04:00
e_exp10l.S Fix exp10 inaccuracy and exceptions (bugs 13884, 13914). 2012-05-06 18:23:44 +00:00
e_expf.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
e_expl.S Fix x86/x86_64 expl/exp10l spurious underflows (bug 16348). 2014-03-27 18:41:14 +00:00
e_fmodl.S Optimize libm 2011-10-12 11:27:51 -04:00
e_ilogbl.S Remove useless __ilogb*_finite aliases 2012-04-18 00:40:13 +02:00
e_log2l.S Get rid of ASM_TYPE_DIRECTIVE{,_PREFIX}. 2012-08-02 21:04:29 +02:00
e_log10l.S Get rid of ASM_TYPE_DIRECTIVE{,_PREFIX}. 2012-08-02 21:04:29 +02:00
e_logl.S Fix log (1) in round-downward mode (bug 16731). 2014-03-21 18:13:58 +00:00
e_powl.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
e_remainderl.S Optimize libm 2011-10-12 11:27:51 -04:00
e_scalbl.S Get rid of ASM_TYPE_DIRECTIVE{,_PREFIX}. 2012-08-02 21:04:29 +02:00
e_sqrt.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
e_sqrtf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
e_sqrtl.c Update. 2001-09-19 10:37:31 +00:00
fclrexcpt.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
fedisblxcpt.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
feenablxcpt.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
fegetenv.c Make x86_64 fegetenv preserve exception mask (bug 16198). 2014-03-26 18:59:08 +00:00
fegetexcept.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
fegetround.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
feholdexcpt.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
fesetenv.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
fesetround.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
feupdateenv.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
fgetexcptflg.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
fraiseexcpt.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
fsetexcptflg.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
ftestexcept.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
Implies Use x86_64 fpu/bits/fenv.h for i386 and x86_64 2012-06-06 10:13:19 -07:00
k_rem_pio2l.c Dummy files to prevent stub versions from being used. 2007-05-17 18:39:55 +00:00
libm-test-ulps Fix acosh (1) in round-downward mode (bug 16927). 2014-05-14 12:35:40 +00:00
math_ldbl.h Update. 2001-09-19 10:37:31 +00:00
math_private.h Use movq for 64-bit operations 2013-05-15 20:33:45 +02:00
printf_fphex.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_atanl.c Update. 2001-09-19 10:37:31 +00:00
s_ceill.S Remove trailing whitespace. 2013-06-05 20:44:03 +00:00
s_copysign.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_copysignf.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_copysignl.S Update. 2002-07-06 15:07:30 +00:00
s_cosf.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_expm1l.S Fix x86/x86_64 expm1l inaccuracy and exceptions (bugs 13885, 13923). 2012-05-07 19:13:08 +00:00
s_fabs.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_fabsf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_fabsl.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_fdiml.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_finitel.S Update. 2002-09-10 01:40:26 +00:00
s_floorl.S Update. 2003-11-18 07:25:02 +00:00
s_fmax.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_fmaxf.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_fmaxl.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_fmin.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_fminf.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_fminl.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_fpclassifyl.c Update. 2001-09-19 10:37:31 +00:00
s_isinfl.c Update. 2001-09-19 10:37:31 +00:00
s_isnanl.c Update. 2001-09-19 10:37:31 +00:00
s_llrint.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_llrintf.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_llrintl.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_log1pl.S Remove __ELF__ conditionals 2012-02-07 00:41:11 +01:00
s_logbl.c Update. 2001-09-19 10:37:31 +00:00
s_lrint.S lrint and llrint implementation for x86-64. 2002-04-08 08:14:22 +00:00
s_lrintf.S lrint and llrint implementation for x86-64. 2002-04-08 08:14:22 +00:00
s_lrintl.S lrint and llrint implementation for x86-64. 2002-04-08 08:14:22 +00:00
s_nearbyintl.S Update. 2003-11-18 07:25:02 +00:00
s_nextafterl.c Update. 2001-09-19 10:37:31 +00:00
s_nexttoward.c Update. 2001-09-19 10:37:31 +00:00
s_nexttowardf.c Update. 2001-09-19 10:37:31 +00:00
s_rintl.c Update. 2001-09-19 10:37:31 +00:00
s_scalbnl.S Update. 2003-11-18 07:25:02 +00:00
s_signbit.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_signbitf.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_significandl.c Update. 2001-09-19 10:37:31 +00:00
s_sincosf.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_sinf.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_truncl.S Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00