glibc/math
Joseph Myers b376a11a19 Fix dbl-64 exp overflow/underflow in non-default rounding modes (bug 16284).
The dbl-64 version of exp needs round-to-nearest mode for its internal
computations, but that has the consequence of inappropriate
overflowing and underflowing results in other rounding modes.  This
patch fixes this by recomputing the relevant results in cases where
the round-to-nearest result overflows to infinity or underflows to
zero (most of the diffs are actually just consequent reindentation).
Tests are enabled in all rounding modes for complex functions using
exp - but not for cexp because it turns out there are bugs causing
spurious underflows for cexp for some tests, which will need to be
fixed separately (I suspect ccos ccosh csin csinh ctan ctanh have
similar bugs, just not shown by the present set of test inputs).

Tested x86_64 and x86 and ulps updated accordingly.

	[BZ #16284]
	* sysdeps/ieee754/dbl-64/e_exp.c (__ieee754_exp): Use original
	rounding mode to recompute results that overflow to infinity or
	underflow to zero.
	* math/auto-libm-test-in: Don't mark tests as expected to fail for
	bug 16284.
	* math/auto-libm-test-out: Regenerated.
	* math/libm-test.inc (ccos_test): Use ALL_RM_TEST.
	(ccosh_test): Likewise.
	(csin_test_data): Use plus_oflow.
	(csin_test): Use ALL_RM_TEST.
	(csinh_test_data): Use plus_oflow.
	(csinh_test): Use ALL_RM_TEST.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
2014-03-24 12:18:45 +00:00
..
bits Complete _BSD_SOURCE / _SVID_source followup cleanup. 2014-02-21 21:45:26 +00:00
machine
atest-exp2.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
atest-exp.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
atest-sincos.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
auto-libm-test-in Fix dbl-64 exp overflow/underflow in non-default rounding modes (bug 16284). 2014-03-24 12:18:45 +00:00
auto-libm-test-out Fix dbl-64 exp overflow/underflow in non-default rounding modes (bug 16284). 2014-03-24 12:18:45 +00:00
basic-test.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
bug-nextafter.c Make more libm tests condition exceptions tests with math-tests.h. 2013-06-12 12:41:25 +00:00
bug-nexttoward.c Make more libm tests condition exceptions tests with math-tests.h. 2013-06-12 12:41:25 +00:00
bug-tgmath1.c
cabs.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
cabsf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
cabsl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
carg.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
cargf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
cargl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
cimag.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
cimagf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
cimagl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
complex.h Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
conj.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
conjf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
conjl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
creal.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
crealf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
creall.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
divtc3.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
e_acoshl.c [BZ #157] Remove include/stub-tag.h for good. 2012-11-04 19:59:40 +01:00
e_acosl.c [BZ #157] Remove include/stub-tag.h for good. 2012-11-04 19:59:40 +01:00
e_asinl.c [BZ #157] Remove include/stub-tag.h for good. 2012-11-04 19:59:40 +01:00
e_atan2l.c [BZ #157] Remove include/stub-tag.h for good. 2012-11-04 19:59:40 +01:00
e_atanhl.c [BZ #157] Remove include/stub-tag.h for good. 2012-11-04 19:59:40 +01:00
e_coshl.c [BZ #157] Remove include/stub-tag.h for good. 2012-11-04 19:59:40 +01:00
e_exp2l.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
e_exp10.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
e_exp10f.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
e_exp10l.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
e_expl.c [BZ #157] Remove include/stub-tag.h for good. 2012-11-04 19:59:40 +01:00
e_fmodl.c [BZ #157] Remove include/stub-tag.h for good. 2012-11-04 19:59:40 +01:00
e_gammal_r.c [BZ #157] Remove include/stub-tag.h for good. 2012-11-04 19:59:40 +01:00
e_hypotl.c [BZ #157] Remove include/stub-tag.h for good. 2012-11-04 19:59:40 +01:00
e_j0l.c [BZ #157] Remove include/stub-tag.h for good. 2012-11-04 19:59:40 +01:00
e_j1l.c [BZ #157] Remove include/stub-tag.h for good. 2012-11-04 19:59:40 +01:00
e_jnl.c [BZ #157] Remove include/stub-tag.h for good. 2012-11-04 19:59:40 +01:00
e_lgammal_r.c [BZ #157] Remove include/stub-tag.h for good. 2012-11-04 19:59:40 +01:00
e_log2l.c [BZ #157] Remove include/stub-tag.h for good. 2012-11-04 19:59:40 +01:00
e_log10l.c [BZ #157] Remove include/stub-tag.h for good. 2012-11-04 19:59:40 +01:00
e_logl.c [BZ #157] Remove include/stub-tag.h for good. 2012-11-04 19:59:40 +01:00
e_powl.c [BZ #157] Remove include/stub-tag.h for good. 2012-11-04 19:59:40 +01:00
e_rem_pio2l.c [BZ #157] Remove include/stub-tag.h for good. 2012-11-04 19:59:40 +01:00
e_scalb.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
e_scalbf.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
e_scalbl.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
e_sinhl.c [BZ #157] Remove include/stub-tag.h for good. 2012-11-04 19:59:40 +01:00
e_sqrtl.c [BZ #157] Remove include/stub-tag.h for good. 2012-11-04 19:59:40 +01:00
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 Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
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
fenv.h 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
fpu_control.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
gen-auto-libm-tests.c Adjust how gen-auto-libm-tests handles before-rounding/after-rounding cases. 2014-03-06 14:11:19 +00:00
gen-libm-test.pl Make libm-test support ALL_RM_TEST with AUTO_TESTS_*. 2014-03-20 11:48:07 +00:00
ieee-math.c
k_casinh.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
k_casinhf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
k_casinhl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
k_cosl.c [BZ #157] Remove include/stub-tag.h for good. 2012-11-04 19:59:40 +01:00
k_rem_pio2l.c [BZ #157] Remove include/stub-tag.h for good. 2012-11-04 19:59:40 +01:00
k_sincosl.c
k_sinl.c [BZ #157] Remove include/stub-tag.h for good. 2012-11-04 19:59:40 +01:00
k_tanl.c [BZ #157] Remove include/stub-tag.h for good. 2012-11-04 19:59:40 +01:00
libm-test.inc Fix dbl-64 exp overflow/underflow in non-default rounding modes (bug 16284). 2014-03-24 12:18:45 +00:00
Makefile Consistently include Makeconfig after defining subdir. 2014-02-26 23:12:03 +00:00
math.h Complete _BSD_SOURCE / _SVID_source followup cleanup. 2014-02-21 21:45:26 +00:00
multc3.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
README.libm-test Don't include individual test ulps in libm-test-ulps. 2014-03-05 15:02:38 +00:00
s_asinhl.c [BZ #157] Remove include/stub-tag.h for good. 2012-11-04 19:59:40 +01:00
s_atanl.c [BZ #157] Remove include/stub-tag.h for good. 2012-11-04 19:59:40 +01:00
s_cacos.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_cacosf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_cacosh.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_cacoshf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_cacoshl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_cacosl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_casin.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_casinf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_casinh.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_casinhf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_casinhl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_casinl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_catan.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_catanf.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_catanh.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_catanhf.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_catanhl.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_catanl.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_cbrtl.c [BZ #157] Remove include/stub-tag.h for good. 2012-11-04 19:59:40 +01:00
s_ccos.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_ccosf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_ccosh.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_ccoshf.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_ccoshl.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_ccosl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_cexp.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_cexpf.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_cexpl.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_clog10.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_clog10f.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_clog10l.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_clog.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_clogf.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_clogl.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_cpow.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_cpowf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_cpowl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_cproj.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_cprojf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_cprojl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_csin.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_csinf.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_csinh.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_csinhf.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_csinhl.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_csinl.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_csqrt.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_csqrtf.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_csqrtl.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_ctan.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_ctanf.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_ctanh.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_ctanhf.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_ctanhl.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_ctanl.c Use glibc_likely instead __builtin_expect. 2014-02-10 15:07:12 +01:00
s_erfl.c [BZ #157] Remove include/stub-tag.h for good. 2012-11-04 19:59:40 +01:00
s_expm1l.c [BZ #157] Remove include/stub-tag.h for good. 2012-11-04 19:59:40 +01:00
s_fdim.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_fdimf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_fdiml.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_fma.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_fmaf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_fmal.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_fmax.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_fmaxf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_fmaxl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_fmin.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_fminf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_fminl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_ldexp.c Remove __STDC__ conditionals from libm. 2012-01-27 17:29:45 +00:00
s_ldexpf.c Remove __STDC__ conditionals from libm. 2012-01-27 17:29:45 +00:00
s_ldexpl.c Remove __STDC__ conditionals from libm. 2012-01-27 17:29:45 +00:00
s_log1pl.c [BZ #157] Remove include/stub-tag.h for good. 2012-11-04 19:59:40 +01:00
s_nan.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_nanf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_nanl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
s_nextafter.c Fix nextafter overflow in non-default rounding modes (bug 16677). 2014-03-11 22:24:00 +00:00
s_nexttowardf.c Fix nexttoward bugs (bugs 2550, 2570). 2012-05-01 15:37:43 +00:00
s_nexttowardl.c
s_significand.c Remove __STDC__ conditionals from libm. 2012-01-27 17:29:45 +00:00
s_significandf.c Remove __STDC__ conditionals from libm. 2012-01-27 17:29:45 +00:00
s_significandl.c Remove __STDC__ conditionals from libm. 2012-01-27 17:29:45 +00:00
s_tanhl.c [BZ #157] Remove include/stub-tag.h for good. 2012-11-04 19:59:40 +01:00
setfpucw.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
t_sincosl.c
test-double.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
test-fenv-tls.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
test-fenv.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
test-float.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
test-fpucw-ieee-static.c Fix static-binary lazy FPU context allocation 2013-09-09 22:36:57 +01:00
test-fpucw-ieee.c Fix math/test-fpucw-*.c for sysdeps test-fpucw.c overrides. 2014-01-16 05:30:52 +00:00
test-fpucw-static.c Fix math/test-fpucw-*.c for sysdeps test-fpucw.c overrides. 2014-01-16 05:30:52 +00:00
test-fpucw.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
test-idouble.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
test-ifloat.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
test-ildoubl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
test-ldouble.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
test-matherr.c Remove _BSD_SOURCE and _SVID_SOURCE. 2014-02-11 23:40:07 +00:00
test-misc.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
test-powl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
test-snan.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
test-tgmath2.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
test-tgmath-int.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
test-tgmath-ret.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
test-tgmath.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
tgmath.h Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
tst-CMPLX2.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
tst-CMPLX.c Don't disable CMPLXL macro for __NO_LONG_DOUBLE_MATH (bug 15488). 2013-05-18 12:12:38 +00:00
tst-definitions.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
Versions New <math.h> macro named issignaling to check for a signaling NaN (sNaN). 2013-04-02 13:51:02 +02:00
w_acos.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
w_acosf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
w_acosh.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
w_acoshf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
w_acoshl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
w_acosl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
w_asin.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
w_asinf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
w_asinl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
w_atan2.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
w_atan2f.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
w_atan2l.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
w_atanh.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
w_atanhf.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
w_atanhl.c Update copyright notices with scripts/update-copyrights 2014-01-01 22:00:23 +10:00
w_cosh.c Optimize libm 2011-10-12 11:27:51 -04:00
w_coshf.c Optimize libm 2011-10-12 11:27:51 -04:00
w_coshl.c Avoid overflows from long double functions using __kernel_standard. 2012-03-28 09:32:12 +00:00
w_drem.c
w_dremf.c Remove trailing whitespace. 2013-06-05 20:44:03 +00:00
w_dreml.c
w_exp2.c Fix exp2 errno setting on underflow (bug 16283). 2013-12-03 20:50:51 +00:00
w_exp2f.c Fix exp2 errno setting on underflow (bug 16283). 2013-12-03 20:50:51 +00:00
w_exp2l.c Fix exp2 errno setting on underflow (bug 16283). 2013-12-03 20:50:51 +00:00
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w_tgamma.c Fix tgamma errno setting on underflow (bug 6810). 2013-12-05 14:01:41 +00:00
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README for libm-test math test suite
====================================

The libm-test math test suite tests a number of function points of
math functions in the GNU C library.  The following sections contain a
brief overview.  Please note that the test drivers and the Perl script
"gen-libm-test.pl" have some options.  A full list of options is
available with --help (for the test drivers) and -h for
"gen-libm-test.pl".


What is tested?
===============
The tests just evaluate the functions at specified points and compare
the results with precomputed values and the requirements of the ISO
C99 standard.

Besides testing the special values mandated by IEEE 754 (infinities,
NaNs and minus zero), some more or less random values are tested.

Files that are part of libm-test
================================

The main file is "libm-test.inc".  It is platform and floating point
format independent.  The file must be preprocessed by the Perl script
"gen-libm-test.pl".  The results are "libm-test.c" and a file
"libm-test-ulps.h" with platform specific deltas.

The test drivers test-double.c, test-float.c, test-ldouble.c test the
normal double, float and long double implementation of libm.  The test
drivers with an i in it (test-idouble.c, test-ifloat.c,
test-ildoubl.c) test the corresponding inline functions (where
available - otherwise they also test the real functions in libm).

"gen-libm-test.pl" needs a platform specific files with ULPs (Units of
Last Precision).  The file is called "libm-test-ulps" and lives in
platform specific sysdep directory.

How can I generate "libm-test-ulps"?
====================================

To automatically generate a new "libm-test-ulps" run "make regen-ulps".
This generates the file "math/NewUlps" in the build directory.  The file
contains the sorted results of all the tests.  You can use the "NewUlps"
file as the machine's updated "libm-test-ulps" file.  Copy "NewUlps" to
"libm-test-ulps" in the appropriate machine sysdep directory.  Verify
the changes, post your patch, and check it in after review.

To manually generate a new "libm-test-ulps" file, first remove "ULPs"
file in the current directory, then you can execute for example:
    ./testrun.sh math/test-double -u --ignore-max-ulp=yes
This generates a file "ULPs" with all double ULPs in it, ignoring any
previously calculated ULPs, and running with the newly built dynamic
loader and math library (assumes you didn't install your build).  Now
generate the ULPs for all other formats, the tests will be appending the
data to the "ULPs" file.  As final step run "gen-libm-test.pl" with the
file as input and ask to generate a pretty printed output in the file
"NewUlps":
  gen-libm-test.pl -u ULPs -n
Copy "NewUlps" to "libm-test-ulps" in the appropriate machine sysdep
directory.

Note that the test drivers have an option "-u" to output an unsorted
list of all epsilons that the functions have.  The output can be read
in directly but it's better to pretty print it first.
"gen-libm-test.pl" has an option to generate a pretty-printed and
sorted new ULPs file from the output of the test drivers.

Contents of libm-test-ulps
==========================

Since libm-test-ulps can be generated automatically, just a few notes.
The file contains lines for maximal errors of single functions, like:

Function "yn":
idouble: 6

The keywords are float, ifloat, double, idouble, ldouble and ildouble
(the prefix i stands for inline).

Adding tests to libm-test.inc
=============================

The tests are evaluated by a set of special test macros.  The macros
start with "TEST_" followed by a specification the input values, an
underscore and a specification of the output values.  As an example,
the test macro for a function with input of type FLOAT (FLOAT is
either float, double, long double) and output of type FLOAT is
"TEST_f_f".  The macro's parameter are the name of the function, the
input parameter, output parameter and optionally one exception
parameter.

The accepted parameter types are:
- "f" for FLOAT
- "b" for boolean - just tests if the output parameter evaluates to 0
  or 1 (only for output).
- "c" for complex.  This parameter needs two values, first the real,
  then the imaginary part.
- "i" for int.
- "l" for long int.
- "L" for long long int.
- "F" for the address of a FLOAT (only as input parameter)
- "I" for the address of an int (only as input parameter)