Commit Graph

900 Commits

Author SHA1 Message Date
Joseph Myers
ff069f024a Fix lgammaf spurious underflows (bug 18220).
The flt-32 implementation of lgammaf produces spurious underflow
exceptions for some large arguments, because of calculations involving
x^-2 multiplied by small constants.  This patch fixes this by
adjusting the threshold for a simpler computation to 2**26 (the error
in the simpler computation is on the order of 0.5 * log (x), for a
result on the order of x * log (x)).

Tested for x86_64 and x86.

	[BZ #18220]
	* sysdeps/ieee754/flt-32/e_lgammaf_r.c (__ieee754_lgammaf_r): Use
	2**26 not 2**58 as threshold for returning x * (log (x) - 1).
	* math/auto-libm-test-in: Add another test of lgamma.
	* math/auto-libm-test-out: Regenerated.
2015-05-15 17:21:08 +00:00
Joseph Myers
fbc68f03b0 Fix erfcf spurious underflows (bug 18217).
The flt-32 implementation of erfcf produces spurious underflow
exceptions for some arguments close to 0, because of calculations
squaring the argument and then multiplying by small constants.  This
patch fixes this by adjusting the threshold for arguments for which
the result is so close to 1 that 1 - x will give the right result from
2**-56 to 2**-26.  (If 1 - x * 2/sqrt(pi) were used, the errors would be
on the order of x^3 and a much larger threshold could be used.)

Tested for x86_64 and x86.

	[BZ #18217]
	* sysdeps/ieee754/flt-32/s_erff.c (__erfcf): Use 2**-26 not 2**-56
	as threshold for returning 1 - x.
	* math/auto-libm-test-in: Add more tests of erfc.
	* math/auto-libm-test-out: Regenerated.
2015-05-15 00:16:10 +00:00
Joseph Myers
9a71f1fcf5 Fix atanf spurious underflows (bug 18196).
The sysdeps/ieee754/flt-32 version of atanf produces spurious
underflow exceptions for some large arguments, because of computations
that compute x^-4.  This patch fixes this by adjusting the threshold
for large arguments (for which +/- pi/2 can just be returned, the
correct result being roughly +/- pi/2 - 1/x) from 2^34 to 2^25.

Tested for x86_64 and x86.

	[BZ #18196]
	* sysdeps/ieee754/flt-32/s_atanf.c (__atanf): Use 2^25 not 2^34 as
	threshold for large arguments.
	* math/auto-libm-test-in: Add another test of atan.
	* math/auto-libm-test-out: Regenerated.
2015-05-14 23:51:09 +00:00
Joseph Myers
0b7a5f9201 Fix log1p missing underflows (bug 16339).
Similar to various other bugs in this area, some log1p implementations
do not raise the underflow exception for subnormal arguments, when the
result is tiny and inexact.  This patch forces the exception in a
similar way to previous fixes.  (The ldbl-128ibm implementation
doesn't currently need any change as it already generates this
exception, albeit through code that would generate spurious exceptions
in other cases; special code for this issue will only be needed there
when fixing the spurious exceptions.)

Tested for x86_64, x86, powerpc and mips64.

	[BZ #16339]
	* sysdeps/i386/fpu/s_log1p.S (dbl_min): New object.
	(__log1p): Force underflow exception for results with small
	absolute value.
	* sysdeps/i386/fpu/s_log1pf.S (flt_min): New object.
	(__log1pf): Force underflow exception for results with small
	absolute value.
	* sysdeps/ieee754/dbl-64/s_log1p.c: Include <float.h>.
	(__log1p): Force underflow exception for results with small
	absolute value.
	* sysdeps/ieee754/flt-32/s_log1pf.c: Include <float.h>.
	(__log1pf): Force underflow exception for results with small
	absolute value.
	* sysdeps/ieee754/ldbl-128/s_log1pl.c: Include <float.h>.
	(__log1pl): Force underflow exception for results with small
	absolute value.
	* math/auto-libm-test-in: Do not allow missing underflow
	exceptions from log1p.
	* math/auto-libm-test-out: Regenerated.
2015-05-14 23:38:07 +00:00
Andrew Senkevich
5695d46f5d This is update for configure, build and install of vector math library.
Installation of libm.so as linker script only in case of libmvec.so build.

2015-05-14  Andrew Senkevich  <andrew.n.senkevich@gmail.com>

    * Makeconfig (rpath-dirs, all-subdirs): Added mathvec folder.
    (libmvec): New variable.
    * configure.ac: Added option for mathvec build.
    * configure: Regenerated.
    * mathvec/Depend: New file.
    * mathvec/Makefile: New file.
    * shlib-versions: Added libmvec.
    * math/Makefile: Added rule for libm.so installation.
2015-05-14 18:07:06 +03:00
Andrew Senkevich
202d48dab9 This patch adds infrastructure for addition of SIMD
declarations for math functions in math.h. Added new headers math-vector.h
(only generic version for now) and libm-simd-decl-stubs.h with empty
definitions required for proper unfolding of new macros __MATHCALL_VEC which
will be used for declaration of vector math functions.

2015-05-14  Andrew Senkevich  <andrew.senkevich@intel.com>

    * bits/math-vector.h: New file.
    * bits/libm-simd-decl-stubs.h: New header.
    * math/Makefile (headers): Added new header libm-simd-decl-stubs.h.
    * math/math.h (__MATHCALL_VEC): New macro.
2015-05-14 18:07:06 +03:00
Andrew Senkevich
58c50f06aa Last part of changes regarding to libm-test.inc: addition
of method for separation which exactly testing function needed to run with
help of generated during make check header with series of conditional
definitions.

2015-05-14  Andrew Senkevich  <andrew.senkevich@intel.com>

    * math/gen-libm-have-vector-test.sh: Script generates series of macros
    for conditions in testing functions.
    * math/Makefile: Added call of libm-have-vector-test.sh.
    * math/libm-test.inc (HAVE_VECTOR): New macros.
2015-05-14 18:07:06 +03:00
Andrew Senkevich
a6cdcd75dc Refactoring of START for conditions in individual tests
and addition of macros used for runtime architecture check.

2015-05-14  Andrew Senkevich  <andrew.senkevich@intel.com>

    * math/libm-test.inc: START refactored.
    * math/test-double.c (TEST_MATHVEC): Add define.
    * math/test-float.c: Likewise.
    * math/test-idouble.c: Likewise.
    * math/test-ifloat.c: Likewise.
    * math/test-ildoubl.c: Likewise.
    * math/test-ldouble.c: Likewise.
    * sysdeps/generic/math-tests-arch.h (INIT_ARCH_EXT, CHECK_ARCH_EXT):
    New helper macros for runtime architecture check.
2015-05-14 18:07:06 +03:00
Andrew Senkevich
ee9716019d This is the beginning of series of patches with addition
of vector math functions infrastructure and several x86_64 implementations.
This patch is preparatory change in libm-test.c - splitting of macros which
form name of tested functions for ability to use separate name for tested
functions and for functions used in test suite infrastructure.

2015-05-14  Andrew Senkevich  <andrew.senkevich@intel.com>

    * math/test-double.c (FUNC_TEST): New macro.
    * math/test-float.c: Likewise.
    * math/test-idouble.c: Likewise.
    * math/test-ifloat.c: Likewise.
    * math/test-ildoubl.c: Likewise.
    * math/test-ldouble.c: Likewise.
    * math/libm-test.inc: Use FUNC_TEST for name of tested functions.
2015-05-14 18:07:06 +03:00
Joseph Myers
14f36098f2 Add more tests of csqrt, lgamma, log10, sinh.
This patch adds more randomly-generated tests of various libm
functions that are observed to increase ulps on x86_64.

Tested for x86_64 and x86 and ulps updated accordingly.

	* math/auto-libm-test-in: Add more tests of csqrt, lgamma, log10
	and sinh.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-05-08 17:55:11 +00:00
Joseph Myers
471dffa12c Add more tests of acosh, atanh, cos, csqrt, erfc, sin, sincos.
This patch adds more randomly-generated tests of various libm
functions that are observed to increase ulps on x86_64.

Tested for x86_64 and x86 and ulps updated accordingly.

	* math/auto-libm-test-in: Add more tests of acosh, atanh, cos,
	csqrt, erfc, sin and sincos.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-05-06 17:30:18 +00:00
Joseph Myers
31450d9a87 Add further tests of libm functions.
This patch adds more randomly-generated tests of various libm
functions that are observed to increase ulps on x86_64.  (This process
must eventually converge, when my random test generation stops finding
inputs that increase the listed ulps, except maybe for any cases
uncovered where the errors exceed the maximum allowed 9ulp error and
so indicate actual libm bugs needing fixing.)

Tested for x86_64 and x86 and ulps updated accordingly.

	* math/auto-libm-test-in: Add more tests of acosh, atanh, clog,
	clog10, csqrt, erfc, exp2, expm1, log10, log2 and sinh.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-05-05 22:59:41 +00:00
Joseph Myers
305392eaca Add more tests of libm functions.
This patch adds more randomly-generated tests of various libm
functions that are observed to increase ulps on x86_64.

Tested for x86_64 and x86 and ulps updated accordingly.

	* math/auto-libm-test-in: Add more tests of atan, clog, clog10,
	cos, csqrt, erf, erfc, exp2, lgamma, log1p, sin, sincos, tanh and
	tgamma.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-05-02 21:06:33 +00:00
Joseph Myers
51e15247c3 Add more tests of tgamma.
This patch adds some randomly-generated tests of tgamma that are
observed to increase ulps on x86_64.

Tested for x86_64 and x86 and ulps updated accordingly.

	* math/auto-libm-test-in: Add more tests of tgamma.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-05-01 23:15:07 +00:00
Joseph Myers
5ffb9a53d7 Add more tests of tanh.
This patch adds some randomly-generated tests of tanh that are
observed to increase ulps on x86_64.

Tested for x86_64 and x86 and ulps updated accordingly.

	* math/auto-libm-test-in: Add more tests of tanh.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-05-01 23:06:44 +00:00
Joseph Myers
0957e15d0a Add more tests of tan.
This patch adds some randomly-generated tests of tan that are observed
to increase ulps on x86_64.

Tested for x86_64 and x86 and ulps updated accordingly.

	* math/auto-libm-test-in: Add more tests of tan.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-05-01 22:54:39 +00:00
Joseph Myers
827bb5859c Add more tests of cos, sin, sincos.
This patch adds some randomly-generated tests of cos, sin and sincos
that are observed to increase ulps on x86_64.

Tested for x86_64 and x86 and ulps updated accordingly.

	* math/auto-libm-test-in: Add more tests of cos, sin and sincos.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-05-01 22:41:00 +00:00
Joseph Myers
86793ae758 Add another test of pow.
This patch adds a randomly-generated test of pow that is observed to
increase ulps on x86_64.

Tested for x86_64 and x86 and ulps updated accordingly.

	* math/auto-libm-test-in: Add another test of pow.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/x86_64/fpu/libm-test-ulps: Update.
2015-05-01 22:31:24 +00:00
Joseph Myers
038e4be99c Add more tests of lgamma.
This patch adds some randomly-generated tests of lgamma that are
observed to increase ulps on x86_64.

Tested for x86_64 and x86 and ulps updated accordingly.

	* math/auto-libm-test-in: Add more tests of lgamma.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-05-01 22:17:19 +00:00
Joseph Myers
a0d31f36aa Add more tests of log, log10, log1p, log2.
This patch adds some randomly-generated tests of log, log10, log1p and
log2 that are observed to increase ulps on x86_64.

Tested for x86_64 and x86 and ulps updated accordingly.

	* math/auto-libm-test-in: Add more tests of log, log10, log2 and
	log1p.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-05-01 21:08:37 +00:00
Joseph Myers
e1483b365d Add more tests of exp, exp10, exp2, expm1.
This patch adds some randomly-generated tests of exp, exp10, exp2 and
expm1 that are observed to increase ulps on x86_64.

Tested for x86_64 and x86 and ulps updated accordingly.

	* math/auto-libm-test-in: Add more tests of exp, exp10, exp2 and
	expm1.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-05-01 20:33:04 +00:00
Joseph Myers
c5a3a509df Add more tests of erf, erfc.
This patch adds some randomly-generated tests of erf and erfc that are
observed to increase ulps on x86_64.

Tested for x86_64 and x86 and ulps updated accordingly.

	* math/auto-libm-test-in: Add more tests of erf and erfc.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-05-01 17:49:44 +00:00
Joseph Myers
9862ab1f67 Add more tests of csqrt.
This patch adds some randomly-generated tests of csqrt that are
observed to increase ulps on x86_64.

Tested for x86_64 and x86 and ulps updated accordingly.

	* math/auto-libm-test-in: Add more tests of csqrt.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-04-30 22:51:29 +00:00
Joseph Myers
094fca83ee Add further tests of cosh and sinh.
This patch adds some further randomly-generated tests of cosh and sinh
that are observed to increase ulps on x86_64.

Tested for x86_64 and x86 and ulps updated accordingly.

	* math/auto-libm-test-in: Add more tests of cosh and sinh.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-04-30 22:32:08 +00:00
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
Wilco Dijkstra
92f2897953 Use __copysign rather than copysign. 2015-04-22 12:07:56 +00:00
Stefan Liebler
de8aadd52c Set errno for log1p on pole/domain error.
According to bug 6792, errno is not set to ERANGE/EDOM
by calling log1p/log1pf/log1pl with x = -1 or x < -1.

This patch adds a wrapper which sets errno in those cases
and returns the value of the existing __log1p function.
The log1p is now an alias to the wrapper function
instead of __log1p.

The files in sysdeps are reflecting these changes.
The ia64 implementation sets errno by itself,
thus the wrapper-file is empty.

The libm-test is adjusted for log1p-tests to check errno.

	[BZ #6792]
	* math/w_log1p.c: New file.
	* math/w_log1pf.c: Likewise.
	* math/w_log1pl.c: Likewise.
	* math/Makefile (libm-calls): Add w_log1p.
	* math/s_log1pl.c (log1pl): Remove weak_alias.
	* sysdeps/i386/fpu/s_log1p.S (log1p): Likewise.
	* sysdeps/i386/fpu/s_log1pf.S (log1pf): Likewise.
	* sysdeps/i386/fpu/s_log1pl.S (log1pl): Likewise.
	* sysdeps/x86_64/fpu/s_log1pl.S (log1pl): Likewise.
	* sysdeps/ieee754/dbl-64/s_log1p.c (log1p): Likewise.
	[NO_LONG_DOUBLE] (log1pl): Likewise.
	* sysdeps/ieee754/flt-32/s_log1pf.c (log1pf): Likewise.
	* sysdeps/ieee754/ldbl-128/s_log1pl.c (log1pl): Likewise.
	* sysdeps/ieee754/ldbl-64-128/s_log1pl.c
	(log1p): Remove long_double_symbol.
	* sysdeps/ieee754/ldbl-128ibm/s_log1pl.c (log1pl): Likewise.
	* sysdeps/ieee754/ldbl-64-128/w_log1pl.c: New file.
	* sysdeps/ieee754/ldbl-128ibm/w_log1pl.c: Likewise.
	* sysdeps/m68k/m680x0/fpu/s_log1p.c: Define empty weak_alias to
	remove weak_alias for corresponding log1p function.
	* sysdeps/m68k/m680x0/fpu/s_log1pf.c: Likewise.
	* sysdeps/m68k/m680x0/fpu/s_log1pl.c: Likewise.
	* sysdeps/ia64/fpu/w_log1p.c: New file.
	* sysdeps/ia64/fpu/w_log1pf.c: Likewise.
	* sysdeps/ia64/fpu/w_log1pl.c: Likewise.
	* math/libm-test.inc (log1p_test_data):	Add errno expectations.
2015-04-13 21:19:27 +02:00
Joseph Myers
b3c66c534f Add more tests of clog and clog10.
This patch adds some randomly-generated tests of clog and clog10 that
are observed to increase ulps on x86_64.

Tested for x86_64 and x86 and ulps updated accordingly.

	* math/auto-libm-test-in: Add more tests of clog and clog10.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-04-09 22:14:34 +00:00
Joseph Myers
787d22bce6 Add more tests of atanh.
This patch adds some randomly-generated tests of atanh that are
observed to increase ulps on x86_64.

Tested for x86_64 and x86 and ulps updated accordingly.

	* math/auto-libm-test-in: Add more tests of atanh.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-04-08 21:13:35 +00:00
Joseph Myers
024bcc5106 Add more tests of atan.
This patch adds some randomly-generated tests of atan that are
observed to increase ulps on x86_64.

Tested for x86_64 and x86 and ulps updated accordingly.

	* math/auto-libm-test-in: Add more tests of atan.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-04-08 21:00:03 +00:00
Joseph Myers
da0cf658c6 Add more tests of cbrt.
This patch adds some randomly-generated tests of cbrt that are
observed to increase ulps on x86_64.

Tested for x86_64 and x86 and ulps updated accordingly.

	* math/auto-libm-test-in: Add more tests of cbrt.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/x86_64/fpu/libm-test-ulps: Update.
2015-04-08 17:56:15 +00:00
Joseph Myers
80352c01c1 Add more tests of cabs.
This patch adds some randomly-generated tests of cabs that are
observed to increase ulps on x86_64.

Tested for x86_64 and x86 and ulps updated accordingly.

	* math/auto-libm-test-in: Add more tests of cabs.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-04-08 17:46:07 +00:00
Joseph Myers
8431838dde Fix dbl-64 atan2 in non-default rounding modes (bug 18210, bug 18211).
The dbl-64 implementation of atan2 does computations that expect to
run in round-to-nearest mode, and in other modes the errors can
accumulate to more than the maximum accepted 9ulp.  This patch makes
it use FE_TONEAREST internally, similar to other functions with such
issues.  Tests that previously produced large errors are added for
atan2 and the closely related carg, clog and clog10 functions.

Tested for x86_64 and x86 and ulps updated accordingly.

	[BZ #18210]
	[BZ #18211]
	* sysdeps/ieee754/dbl-64/e_atan2.c: Include <fenv.h>.
	(__ieee754_atan2): Set FE_TONEAREST mode for internal
	computations.
	* math/auto-libm-test-in: Add more tests of atan2, carg, clog and
	clog10.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-04-08 17:32:17 +00:00
Joseph Myers
ae63c7ebed Fix dbl-64 atan in non-default rounding modes (bug 18197).
The dbl-64 implementation of atan does computations that expect to run
in round-to-nearest mode, and in other modes the errors can accumulate
to more than the maximum accepted 9ulp.  This patch makes it use
FE_TONEAREST internally, similar to other functions with such issues.

Tested for x86_64 and x86; no ulps updates needed.

	[BZ #18197]
	* sysdeps/ieee754/dbl-64/s_atan.c: Include <fenv.h>.
	(atan): Set FE_TONEAREST mode for internal computations.
	* math/auto-libm-test-in: Add more tests of atan.
	* math/auto-libm-test-out: Regenerated.
2015-04-08 17:14:12 +00:00
Richard Henderson
9e8c0381bb math/test-fenvinline: Cast fe_exc to unsigned int before printing
On Alpha and IA-64, fexcept_t is unsigned long.  But all the values
fit within an int, so the cast is ok for printing.  All other hosts
use unsigned int or unsigned short already.
2015-04-06 10:43:59 -07:00
Joseph Myers
efd5b641dd Add more tests of acosh, asinh and atanh.
This patch adds some randomly-generated tests of acosh, asinh and
atanh that are observed to increase ulps on x86_64.

Tested for x86_64 and x86 and ulps updated accordingly.

	* math/auto-libm-test-in: Add more tests of acosh, asinh and
	atanh.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-03-25 22:21:20 +00:00
Joseph Myers
e9b1015112 Add another test of asin.
This patch adds a randomly-generated test of asin that is observed to
increase ulps on x86_64.

Tested for x86_64 and x86 and ulps updated accordingly.

	* math/auto-libm-test-in: Add another test of asin.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-03-25 21:57:04 +00:00
Joseph Myers
38755f1421 Add more tests of asin.
This patch adds some randomly-generated tests of asin that are
observed to increase ulps on x86_64.

Tested for x86_64 and x86 and ulps updated accordingly.

	* math/auto-libm-test-in: Add more tests of asin.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-03-25 17:53:58 +00:00
Joseph Myers
8d6439712d Add more tests of acos.
This patch adds some randomly-generated tests of acos that are
observed to increase ulps on x86_64.

Tested for x86_64 and x86 and ulps updated accordingly.

	* math/auto-libm-test-in: Add more tests of acos.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-03-25 00:30:10 +00:00
Joseph Myers
bc899ea090 Add more tests of expm1.
This patch adds some randomly-generated tests of expm1 that are
observed to increase ulps on x86_64.

Tested for x86_64 and x86 and ulps updated accordingly.

	* math/auto-libm-test-in: Add more tests of expm1.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-03-25 00:05:13 +00:00
Joseph Myers
239ed6f309 Add more tests of cosh, sinh.
This patch adds some randomly-generated tests of cosh and sinh that
are observed to increase ulps on x86_64.

Tested for x86_64 and x86 and ulps updated accordingly.

	* math/auto-libm-test-in: Add more tests of cosh and sinh.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-03-24 23:48:04 +00:00
Joseph Myers
7c84a5042f Add more tests of log2.
In testing for x86_64 on an AMD processor, I observed libm test
failures of the form:

testing long double (without inline functions)
Failure: Test: log2_downward (0x2.b7e151628aed4p+0)
Result:
 is:          1.44269504088896356633e+00   0xb.8aa3b295c17f67600000p-3
 should be:   1.44269504088896356622e+00   0xb.8aa3b295c17f67500000p-3
 difference:  1.08420217248550443400e-19   0x8.00000000000000000000p-66
 ulp       :  1.0000
 max.ulp   :  0.0000
Maximal error of `log2_downward'
 is      : 1 ulp
 accepted: 0 ulp

These issues arise because the maximum ulps when regenerating on one
processor are not the same as on another processor, so regeneration on
several processors may be needed when updating libm-test-ulps to avoid
failures for some users testing glibc - but such regeneration on
multiple processors is inconvenient.  Causes can be: on x86 and, for
x86_64, for long double, variation in results of x87 instructions for
transcendental operations between processors; on x86, variation in
compiler excess precision between compiler versions and
configurations; on any processor where the compiler may contract
expressions using fused multiply-add, variation in what contraction
occurs.

Although it's hard to be sure libm-test-ulps covers all ulps that may
be seen in any configuration for the given architecture, in practice
it helps simply to add wider test coverage to make it more likely
that, when testing on one processor, the ulps seen are the biggest
that can be seen for that function on that processor, and hopefully
they are also the biggest that can be seen for that function in other
configurations for that architecture.  Thus, this patch adds some
tests of log2 that increase the ulps I see on x86_64 on an Intel
processor, so that hopefully future from-scratch regenerations on that
processor will produce ulps big enough not to have errors from testing
on AMD processors.  These tests were found by randomly generating
inputs and seeing what produced ulps larger than those currently in
libm-test-ulps.  Of course such increases also improve the accuracy of
the empirical table of known ulps generated from libm-test-ulps files
that goes in the manual.

Tested for x86_64 and x86 and ulps updated accordingly.

	* math/auto-libm-test-in: Add more tests of log2.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-03-24 23:06:28 +00:00
Joseph Myers
6411f81da9 Add test for bug 18104.
[BZ #18104]
	* math/auto-libm-test-in: Add another test of pow.
	* math/auto-libm-test-out: Regenerated.
2015-03-10 17:53:40 +00:00
Adhemerval Zanella
85b290451e powerpc: Fix inline feraiseexcept, feclearexcept macros
This patch fixes the inline feraiseexcept and feclearexcept macros for
powerpc by casting the input argument to integer before operation on it.

It fixes BZ#17776.
2015-03-03 10:01:49 -05:00
Joseph Myers
2ca725c594 Fix ldbl-96, ldbl-128ibm atanhl inaccuracy (bug 18046, bug 18047).
The threshold in ldbl-96 atanhl for when to return the argument,
0x1p-28, is a bit too big, and that in ldbl-128ibm atanhl is much too
big (the relevant condition being x^3/3 being < 0.5ulp of x),
resulting in errors a bit above the limits of those considered
acceptable in glibc in the ldbl-96 case, and in large errors in the
ldbl-128ibm case.  This patch changes those implementations to use
more appropriate thresholds and adds tests around the thresholds for
various formats.

Tested for x86_64, x86 and powerpc.  x86_64 and x86 ulps updated
accordingly.

	[BZ #18046]
	[BZ #18047]
	* sysdeps/ieee754/ldbl-128ibm/e_atanhl.c (__ieee754_atanhl): Use
	0x1p-56L as threshold for just returning the argument.
	* sysdeps/ieee754/ldbl-96/e_atanhl.c (__ieee754_atanhl): Use
	0x1p-32L as threshold for just returning the argument.
	* math/auto-libm-test-in: Add more tests of atanh.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulp: Likewise.
2015-02-27 17:48:37 +00:00
Joseph Myers
1d9ab20c14 Fix ldbl-128/ldbl-128ibm acosl inaccuracy (bug 18038, bug 18039).
The ldbl-128 and ldbl-128ibm implementations of acosl have similar
bugs, using a threshold of 0x1p-57L to determine when they just return
pi/2.  Since the result pi/2 - asinl (x) is roughly pi/2 - x for small
x, the relevant cut-off is actually x being < 0.5ulp of 1.  This patch
fixes the implementations to use that cut-off and adds tests of small
acos arguments.

Tested for powerpc and mips64.  Also tested for x86_64 and x86; no
ulps updates needed.

	[BZ #18038]
	[BZ #18039]
	* sysdeps/ieee754/ldbl-128/e_acosl.c (__ieee754_acosl): Only
	return pi/2 for arguments below 0x1p-113L.
	* sysdeps/ieee754/ldbl-128ibm/e_acosl.c (__ieee754_acosl): Only
	return pi/2 for arguments below 0x1p-106L.
	* math/auto-libm-test-in: Add more tests of acos.
	* math/auto-libm-test-out: Regenerated.
2015-02-26 21:06:34 +00:00
Joseph Myers
ec0ce0d3be Fix asin missing underflows (bug 16351).
Similar to various other bugs in this area, some asin implementations
do not raise the underflow exception for subnormal arguments, when the
result is tiny and inexact.  This patch forces the exception in a
similar way to previous fixes.

Tested for x86_64, x86, powerpc and mips64.

	[BZ #16351]
	* sysdeps/i386/fpu/e_asin.S (dbl_min): New object.
	(MO): New macro.
	(__ieee754_asin): Force underflow exception for results with small
	absolute value.
	* sysdeps/i386/fpu/e_asinf.S (flt_min): New object.
	(MO): New macro.
	(__ieee754_asinf): Force underflow exception for results with
	small absolute value.
	* sysdeps/ieee754/dbl-64/e_asin.c: Include <float.h> and <math.h>.
	(__ieee754_asin): Force underflow exception for results with small
	absolute value.
	* sysdeps/ieee754/flt-32/e_asinf.c: Include <float.h>.
	(__ieee754_asinf): Force underflow exception for results with
	small absolute value.
	* sysdeps/ieee754/ldbl-128/e_asinl.c: Include <float.h>.
	(__ieee754_asinl): Force underflow exception for results with
	small absolute value.
	* sysdeps/ieee754/ldbl-128ibm/e_asinl.c: Include <float.h>.
	(__ieee754_asinl): Force underflow exception for results with
	small absolute value.
	* sysdeps/ieee754/ldbl-96/e_asinl.c: Include <float.h>.
	(__ieee754_asinl): Force underflow exception for results with
	small absolute value.
	* sysdeps/x86_64/fpu/multiarch/e_asin.c [HAVE_FMA4_SUPPORT]:
	Include <math.h>.
	* math/auto-libm-test-in: Do not mark underflow exceptions as
	possibly missing for bug 16351.
	* math/auto-libm-test-out: Regenerated.
2015-02-26 17:18:54 +00:00
Joseph Myers
380bd0fd24 Fix ldbl-128ibm logbl near powers of 2 (bug 18030).
The ldbl-128ibm implementation of logbl produces incorrect results
when the high part of the argument is a power of 2 and the low part a
nonzero number with the opposite sign (and so the returned exponent
should be 1 less than that of the high part).  For example, logbl
(0x1.ffffffffffffffp1L) returns 2 but should return 1.  (This is
similar to (fixed) bug 16740 for frexpl, and (fixed) bug 18029 for
ilogbl.)  This patch adds checks for that case.

Tested for powerpc.

	[BZ #18030]
	* sysdeps/ieee754/ldbl-128ibm/s_logbl.c (__logbl): Adjust exponent
	of power of 2 down when low part has opposite sign.
	* math/libm-test.inc (logb_test_data): Add more tests.
2015-02-26 15:14:58 +00:00
Joseph Myers
524ae9ea2e Fix ldbl-128ibm ilogbl near powers of 2 (bug 18029).
The ldbl-128ibm implementation of ilogbl produces incorrect results
when the high part of the argument is a power of 2 and the low part a
nonzero number with the opposite sign (and so the returned exponent
should be 1 less than that of the high part).  For example, ilogbl
(0x1.ffffffffffffffp1L) returns 2 but should return 1.  (This is
similar to (fixed) bug 16740 for frexpl, and bug 18030 for logbl.)
This patch adds checks for that case.

Tested for powerpc.

	[BZ #18029]
	* sysdeps/ieee754/ldbl-128ibm/e_ilogbl.c (__ieee754_ilogbl):
	Adjust exponent of power of 2 down when low part has opposite
	sign.
	* math/libm-test.inc (ilogb_test_data): Add more tests.
2015-02-26 12:57:21 +00:00
Joseph Myers
137cef7d43 Fix ldbl-128ibm asinhl inaccuracy (bug 18020).
The ldbl-128ibm implementation of asinhl uses cut-offs of 0x1p28 and
0x1p-29 to determine when to use simpler formulas that avoid possible
overflow / underflow.  Both those cut-offs are inappropriate for this
format, resulting in large errors.  This patch changes the code to use
more appropriate cut-offs of 0x1p56 and 0x1p-56, adding tests around
the cut-offs for various floating-point formats.

Tested for powerpc.  Also tested for x86_64 and x86 and updated ulps.

	[BZ #18020]
	* sysdeps/ieee754/ldbl-128ibm/s_asinhl.c (__asinhl): Use 2**56 and
	2**-56 not 2**28 and 2**-29 as thresholds for simpler formulas.
	* math/auto-libm-test-in: Add more tests of asinh.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2015-02-25 11:13:41 +00:00