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glibc/sysdeps/i386/fpu
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Joseph Myers 2145f97cee Handle more state in i386/x86_64 fesetenv (bug 16068). 
fenv_t should include architecture-specific floating-point modes and
status flags.  i386 and x86_64 fesetenv limit which bits they use from
the x87 status and control words, when using saved state, and limit
which parts of the state they set to fixed values, when using
FE_DFL_ENV / FE_NOMASK_ENV.  The following should be included but are
excluded in at least some cases: status and masking for the "denormal
operand" exception (which isn't part of FE_ALL_EXCEPT); precision
control (explicitly mentioned in Annex F as something that counts as
part of the floating-point environment); MXCSR FZ and DAZ bits (for
FE_DFL_ENV and FE_NOMASK_ENV).  This patch arranges for this extra
state to be handled by fesetenv (and thereby by feupdateenv, which
calls fesetenv).

(Note that glibc functions using floating point are not generally
expected to work correctly with non-default values of this state,
especially precision control, but it is still logically part of the
floating-point environment and should be handled as such by fesetenv.
Changes to the state relating to subnormals ought generally to work
with libm functions when the arguments aren't subnormal and neither
are the expected results; that's a consequence of functions avoiding
spurious internal underflows.)

A question arising from this is whether FE_NOMASK_ENV should or should
not mask the "denormal operand" exception.  I decided it should mask
that exception.  This is the status quo - previously that exception
could only be unmasked by direct manipulation of control registers
(possibly via <fpu_control.h>).  In addition, it means that use of
FE_NOMASK_ENV leaves a floating-point environment the same as could be
obtained by fesetenv (FE_DFL_ENV); feenableexcept (FE_ALL_EXCEPT);,
rather than an environment in which an exception is unmasked that
could only be masked again by using fesetenv with FE_DFL_ENV (or a
previously saved environment) - this exception not being usable with
other <fenv.h> functions because it's outside FE_ALL_EXCEPT.

Tested for x86_64 and x86.

	[BZ #16068]
	* sysdeps/i386/fpu/fesetenv.c: Include <fpu_control.h>.
	(FE_ALL_EXCEPT_X86): New macro.
	(__fesetenv): Use FE_ALL_EXCEPT_X86 in most places instead of
	FE_ALL_EXCEPT.  Ensure precision control is included in
	floating-point state.  Ensure that FE_DFL_ENV and FE_NOMASK_ENV
	handle "denormal operand exception" and clear FZ and DAZ bits.
	* sysdeps/x86_64/fpu/fesetenv.c: Include <fpu_control.h>.
	(FE_ALL_EXCEPT_X86): New macro.
	(__fesetenv): Use FE_ALL_EXCEPT_X86 in most places instead of
	FE_ALL_EXCEPT.  Ensure precision control is included in
	floating-point state.  Ensure that FE_DFL_ENV and FE_NOMASK_ENV
	handle "denormal operand exception" and clear FZ and DAZ bits.
	* sysdeps/x86/fpu/test-fenv-sse-2.c: New file.
	* sysdeps/x86/fpu/test-fenv-x87.c: Likewise.
	* sysdeps/x86/fpu/Makefile [$(subdir) = math] (tests): Add
	test-fenv-x87 and test-fenv-sse-2.
	[$(subdir) = math] (CFLAGS-test-fenv-sse-2.c): New variable.
2015-10-28 22:58:29 +00:00
..
doasin.c Update. 2001-03-12 00:04:52 +00:00
e_acos.S Fix x86 acos near 1 (bug 13942). 2012-04-30 18:56:39 +00:00
e_acosf.S Fix acos (-1) in round-downwards mode on x86 (bug 14034). 2012-04-30 09:38:06 +00:00
e_acosh.S Fix i386 acosh (-qNaN) spurious "invalid" exception. 2015-09-30 21:44:42 +00:00
e_acoshf.S Fix i386 acosh (-qNaN) spurious "invalid" exception. 2015-09-30 21:44:42 +00:00
e_acoshl.S Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
e_acosl.c Fix x86 acos near 1 (bug 13942). 2012-04-30 18:56:39 +00:00
e_asin.S Refactor i386 libm code forcing underflow exceptions. 2015-09-24 21:41:00 +00:00
e_asinf.S Refactor i386 libm code forcing underflow exceptions. 2015-09-24 21:41:00 +00:00
e_atan2.S Refactor i386 libm code forcing underflow exceptions. 2015-09-24 21:41:00 +00:00
e_atan2f.S Refactor i386 libm code forcing underflow exceptions. 2015-09-24 21:41:00 +00:00
e_atan2l.c Optimize libm 2011-10-12 11:27:51 -04:00
e_atanh.S Use LOAD_PIC_REG in i386 atanh. 2015-09-24 21:48:22 +00:00
e_atanhf.S Refactor i386 libm code forcing underflow exceptions. 2015-09-24 21:41:00 +00:00
e_atanhl.S Fix i386 atanhl spurious underflows (bug 18049). 2015-05-19 23:05:22 +00:00
e_exp2.S Avoid excess range in results from i386 exp, hypot, pow functions (bug 18980). 2015-09-18 21:53:22 +00:00
e_exp2f.S Avoid excess range in results from i386 exp, hypot, pow functions (bug 18980). 2015-09-18 21:53:22 +00:00
e_exp2l.S Refactor i386 libm code forcing underflow exceptions. 2015-09-24 21:41:00 +00:00
e_exp10.S Avoid excess range in results from i386 exp, hypot, pow functions (bug 18980). 2015-09-18 21:53:22 +00:00
e_exp10f.S Avoid excess range in results from i386 exp, hypot, pow functions (bug 18980). 2015-09-18 21:53:22 +00:00
e_exp10l.S Fix exp10 inaccuracy and exceptions (bugs 13884, 13914). 2012-05-06 18:23:44 +00:00
e_exp.S Avoid excess range in results from i386 exp, hypot, pow functions (bug 18980). 2015-09-18 21:53:22 +00:00
e_expf.S Avoid excess range in results from i386 exp, hypot, pow functions (bug 18980). 2015-09-18 21:53:22 +00:00
e_expl.S Refactor i386 libm code forcing underflow exceptions. 2015-09-24 21:41:00 +00:00
e_fmod.S Optimize libm 2011-10-12 11:27:51 -04:00
e_fmodf.S Optimize libm 2011-10-12 11:27:51 -04:00
e_fmodl.c Optimize libm 2011-10-12 11:27:51 -04:00
e_hypot.S Fix hypot missing underflows (bug 18803). 2015-09-24 23:43:57 +00:00
e_hypotf.S Avoid excess range in results from i386 exp, hypot, pow functions (bug 18980). 2015-09-18 21:53:22 +00:00
e_ilogb.S Remove useless __ilogb*_finite aliases 2012-04-18 00:40:13 +02:00
e_ilogbf.S Remove useless __ilogb*_finite aliases 2012-04-18 00:40:13 +02:00
e_ilogbl.S Remove useless __ilogb*_finite aliases 2012-04-18 00:40:13 +02:00
e_log2.S Fix log2 (1) in round-downward mode (bug 17042). 2014-06-10 12:07:15 +00:00
e_log2f.S Fix log2 (1) in round-downward mode (bug 17042). 2014-06-10 12:07:15 +00:00
e_log2l.S Fix log2 (1) in round-downward mode (bug 17042). 2014-06-10 12:07:15 +00:00
e_log10.S Fix log10 (1) in round-downward mode (bug 16977). 2014-05-23 12:07:50 +00:00
e_log10f.S Fix log10 (1) in round-downward mode (bug 16977). 2014-05-23 12:07:50 +00:00
e_log10l.S Fix log10 (1) in round-downward mode (bug 16977). 2014-05-23 12:07:50 +00:00
e_log.S Fix log (1) in round-downward mode (bug 16731). 2014-03-21 18:13:58 +00:00
e_logf.S Fix log (1) in round-downward mode (bug 16731). 2014-03-21 18:13:58 +00:00
e_logl.S Fix __ieee754_logl (-LDBL_MAX) in FE_DOWNWARD mode (bug 17022). 2014-06-18 12:32:01 +00:00
e_pow.S Fix pow missing underflows (bug 18825). 2015-09-25 22:29:10 +00:00
e_powf.S Fix pow missing underflows (bug 18825). 2015-09-25 22:29:10 +00:00
e_powl.S Fix pow missing underflows (bug 18825). 2015-09-25 22:29:10 +00:00
e_rem_pio2.c Update. 1999-07-14 00:54:57 +00:00
e_remainder.S Optimize libm 2011-10-12 11:27:51 -04:00
e_remainderf.S Optimize libm 2011-10-12 11:27:51 -04:00
e_remainderl.S Optimize libm 2011-10-12 11:27:51 -04:00
e_scalb.S Avoid excess range in results from i386 scalb functions (bug 18981). 2015-09-18 20:34:59 +00:00
e_scalbf.S Avoid excess range in results from i386 scalb functions (bug 18981). 2015-09-18 20:34:59 +00:00
e_scalbl.S Fix x86/x86_64 scalb (qNaN, -Inf) (bug 16783). 2015-02-24 17:30:02 +00:00
e_sqrt.S Fix x86 sqrt rounding (bug 14032). 2013-11-29 16:31:16 +00:00
e_sqrtf.S Optimize libm 2011-10-12 11:27:51 -04:00
e_sqrtl.c Optimize libm 2011-10-12 11:27:51 -04:00
fclrexcpt.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
fedisblxcpt.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
feenablxcpt.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
fegetenv.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
fegetexcept.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
fegetround.c Fix libm fegetround namespace (bug 17748). 2015-01-02 20:44:42 +00:00
feholdexcpt.c Fix libm feholdexcept namespace (bug 17748). 2015-01-05 23:06:14 +00:00
fenv_private.h Fix yn overflow handling in non-default rounding modes (bug 16561, bug 16562). 2014-06-27 14:52:13 +00:00
fesetenv.c Handle more state in i386/x86_64 fesetenv (bug 16068). 2015-10-28 22:58:29 +00:00
fesetround.c Fix libm fesetround namespace (bug 17748). 2015-01-07 00:41:23 +00:00
feupdateenv.c Fix libm feupdateenv namespace (bug 17748). 2015-01-07 19:01:20 +00:00
fgetexcptflg.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
fraiseexcpt.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
fsetexcptflg.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
ftestexcept.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
halfulp.c Update. 2001-03-12 00:04:52 +00:00
i386-math-asm.h Fix pow missing underflows (bug 18825). 2015-09-25 22:29:10 +00:00
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 Update. 1999-07-14 00:54:57 +00:00
libm-test-ulps Fix clog, clog10 inaccuracy (bug 19016). 2015-09-28 22:11:22 +00:00
math_private.h Optimize private 387 fenv access; share code between i386 and x86_64. 2012-03-19 06:51:39 -07:00
math-tests.h Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
mpatan2.c Update. 2001-03-12 00:04:52 +00:00
mpatan.c Update. 2001-03-12 00:04:52 +00:00
mpexp.c Update. 2001-03-12 00:04:52 +00:00
mplog.c Update. 2001-03-12 00:04:52 +00:00
mpsqrt.c Update. 2001-03-12 00:04:52 +00:00
s_asinh.S Fix asinh missing underflows (bug 16350). 2015-06-18 23:27:41 +00:00
s_asinhf.S Fix asinh missing underflows (bug 16350). 2015-06-18 23:27:41 +00:00
s_asinhl.S Fix asinh missing underflows (bug 16350). 2015-06-18 23:27:41 +00:00
s_atan.S Refactor i386 libm code forcing underflow exceptions. 2015-09-24 21:41:00 +00:00
s_atanf.S Refactor i386 libm code forcing underflow exceptions. 2015-09-24 21:41:00 +00:00
s_atanl.c Update. 2001-05-06 17:03:45 +00:00
s_cbrt.S Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_cbrtf.S Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_cbrtl.S Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_ceil.S Add CFI to x86 ceil / floor / trunc (bug 16681). 2014-06-16 22:54:46 +00:00
s_ceilf.S Add CFI to x86 ceil / floor / trunc (bug 16681). 2014-06-16 22:54:46 +00:00
s_ceill.S Add CFI to x86 ceil / floor / trunc (bug 16681). 2014-06-16 22:54:46 +00:00
s_copysign.S Update. 1999-07-14 00:54:57 +00:00
s_copysignf.S Update. 1999-07-14 00:54:57 +00:00
s_copysignl.S Update. 1999-07-14 00:54:57 +00:00
s_expm1.S Refactor i386 libm code forcing underflow exceptions. 2015-09-24 21:41:00 +00:00
s_expm1f.S Refactor i386 libm code forcing underflow exceptions. 2015-09-24 21:41:00 +00:00
s_expm1l.S Fix x86/x86_64 expm1l inaccuracy and exceptions (bugs 13885, 13923). 2012-05-07 19:13:08 +00:00
s_fabs.S Update. 2002-04-03 00:36:12 +00:00
s_fabsf.S Update. 2002-04-03 00:36:12 +00:00
s_fabsl.S Update. 2002-04-03 00:36:12 +00:00
s_fdim.S Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_fdimf.S Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_fdiml.S Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_finite.S Update. 2002-09-10 01:40:26 +00:00
s_finitef.S Update. 2002-09-10 01:40:26 +00:00
s_finitel.S Update. 2002-09-10 01:40:26 +00:00
s_floor.S Add CFI to x86 ceil / floor / trunc (bug 16681). 2014-06-16 22:54:46 +00:00
s_floorf.S Add CFI to x86 ceil / floor / trunc (bug 16681). 2014-06-16 22:54:46 +00:00
s_floorl.S Add CFI to x86 ceil / floor / trunc (bug 16681). 2014-06-16 22:54:46 +00:00
s_fmax.S Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_fmaxf.S Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_fmaxl.S Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_fmin.S Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_fminf.S Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_fminl.S Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_fpclassifyl.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_frexp.S Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_frexpf.S Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_frexpl.S Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_isinfl.c Use <> for math.h and math_private.h everywhere. 2012-03-09 16:09:10 -08:00
s_isnanl.c Use <> for math.h and math_private.h everywhere. 2012-03-09 16:09:10 -08:00
s_llrint.S Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_llrintf.S Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_llrintl.S Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_log1p.S Refactor i386 libm code forcing underflow exceptions. 2015-09-24 21:41:00 +00:00
s_log1pf.S Refactor i386 libm code forcing underflow exceptions. 2015-09-24 21:41:00 +00:00
s_log1pl.S Refactor i386 libm code forcing underflow exceptions. 2015-09-24 21:41:00 +00:00
s_logb.S Update. 1999-07-14 00:54:57 +00:00
s_logbf.S Update. 1999-07-14 00:54:57 +00:00
s_logbl.c Update. 2001-09-18 14:13:20 +00:00
s_lrint.S Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_lrintf.S Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_lrintl.S Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_nearbyint.S Fix i386 / x86_64 nearbyint exception clearing (bug 15491). 2015-10-22 23:14:55 +00:00
s_nearbyintf.S Fix i386 / x86_64 nearbyint exception clearing (bug 15491). 2015-10-22 23:14:55 +00:00
s_nearbyintl.S Fix i386 / x86_64 nearbyint exception clearing (bug 15491). 2015-10-22 23:14:55 +00:00
s_nextafterl.c Fix nextafter overflow in non-default rounding modes (bug 16677). 2014-03-11 22:24:00 +00:00
s_nexttoward.c Fix nexttoward overflow in non-default rounding modes (bug 19059). 2015-10-02 17:11:13 +00:00
s_nexttowardf.c Fix nexttoward overflow in non-default rounding modes (bug 19059). 2015-10-02 17:11:13 +00:00
s_remquo.S Remove remaining bounded-pointers support from i386 .S files. 2013-02-21 22:21:52 +00:00
s_remquof.S Remove remaining bounded-pointers support from i386 .S files. 2013-02-21 22:21:52 +00:00
s_remquol.S Remove remaining bounded-pointers support from i386 .S files. 2013-02-21 22:21:52 +00:00
s_rint.S Update. 1999-07-14 00:54:57 +00:00
s_rintf.S Update. 1999-07-14 00:54:57 +00:00
s_rintl.c Update. 2001-09-18 14:13:20 +00:00
s_scalbln.c Update. 1999-07-14 00:54:57 +00:00
s_scalblnf.c Update. 1999-07-14 00:54:57 +00:00
s_scalblnl.c Update. 1999-07-14 00:54:57 +00:00
s_scalbn.S Avoid excess range in results from i386 scalb functions (bug 18981). 2015-09-18 20:34:59 +00:00
s_scalbnf.S Avoid excess range in results from i386 scalb functions (bug 18981). 2015-09-18 20:34:59 +00:00
s_scalbnl.S Make scalbn set errno (bug 6803). 2015-09-16 21:11:00 +00:00
s_significand.S Update. 1999-07-14 00:54:57 +00:00
s_significandf.S Update. 1999-07-14 00:54:57 +00:00
s_significandl.c (__significandl): Really return significand and not the exponent. 2003-01-07 07:42:11 +00:00
s_trunc.S Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_truncf.S Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
s_truncl.S Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
slowexp.c Update. 2001-03-12 00:04:52 +00:00
slowpow.c Update. 2001-03-12 00:04:52 +00:00
t_exp.c Update. 1999-07-14 00:54:57 +00:00
Versions Update. 2000-06-14 00:55:24 +00:00
w_sqrt.c Fix x86 sqrt rounding (bug 14032). 2013-11-29 16:31:16 +00:00