Find file History
Joseph Myers
Joseph Myers Fix x86_64 / x86 powl inaccuracy for integer exponents (bug 19848).
Bug 19848 reports cases where powl on x86 / x86_64 has error
accumulation, for small integer exponents, larger than permitted by
glibc's accuracy goals, at least in some rounding modes.  This patch
further restricts the exponent range for which the
small-integer-exponent logic is used to limit the possible error
accumulation.

Tested for x86_64 and x86 and ulps updated accordingly.

	[BZ #19848]
	* sysdeps/i386/fpu/e_powl.S (p3): Rename to p2 and change value
	from 8 to 4.
	(__ieee754_powl): Compare integer exponent against 4 not 8.
	* sysdeps/x86_64/fpu/e_powl.S (p3): Rename to p2 and change value
	from 8 to 4.
	(__ieee754_powl): Compare integer exponent against 4 not 8.
	* math/auto-libm-test-in: Add more tests of pow.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/i386/i686/fpu/multiarch/libm-test-ulps: Update.
	* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
Latest commit c898991 Mar 24, 2016
Permalink
Type Name Latest commit message Commit time
..
Failed to load latest commit information.
bits Ensure isinff, isinfl, isnanf, and isnanl are defined (Bug 19439) Feb 15, 2016
machine Update. Jul 14, 1999
Makefile math: don't clobber old libm.so on install [BZ #19822] Mar 21, 2016
README.libm-test Clarify math/README.libm-test. Add "How to read the test output." Jan 29, 2015
Versions Fix lgamma setting signgam for ISO C (bug 15421). Nov 20, 2015
atest-exp.c Fix building glibc master with NDEBUG and --with-cpu. Mar 16, 2016
atest-exp2.c Fix building glibc master with NDEBUG and --with-cpu. Mar 16, 2016
atest-sincos.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
auto-libm-test-in Fix x86_64 / x86 powl inaccuracy for integer exponents (bug 19848). Mar 24, 2016
auto-libm-test-out Fix x86_64 / x86 powl inaccuracy for integer exponents (bug 19848). Mar 24, 2016
basic-test.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
bug-nextafter.c Make more libm tests condition exceptions tests with math-tests.h. Jun 12, 2013
bug-nexttoward.c Make more libm tests condition exceptions tests with math-tests.h. Jun 12, 2013
bug-tgmath1.c Update. May 7, 2004
cabs.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
cabsf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
cabsl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
carg.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
cargf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
cargl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
cimag.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
cimagf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
cimagl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
complex.h Update copyright dates with scripts/update-copyrights. Jan 4, 2016
conj.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
conjf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
conjl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
creal.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
crealf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
creall.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
divtc3.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
e_acoshl.c [BZ #157] Remove include/stub-tag.h for good. Nov 4, 2012
e_acosl.c [BZ #157] Remove include/stub-tag.h for good. Nov 4, 2012
e_asinl.c [BZ #157] Remove include/stub-tag.h for good. Nov 4, 2012
e_atan2l.c [BZ #157] Remove include/stub-tag.h for good. Nov 4, 2012
e_atanhl.c [BZ #157] Remove include/stub-tag.h for good. Nov 4, 2012
e_coshl.c [BZ #157] Remove include/stub-tag.h for good. Nov 4, 2012
e_exp10.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
e_exp10f.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
e_exp10l.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
e_exp2l.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
e_expl.c [BZ #157] Remove include/stub-tag.h for good. Nov 4, 2012
e_fmodl.c [BZ #157] Remove include/stub-tag.h for good. Nov 4, 2012
e_gammal_r.c [BZ #157] Remove include/stub-tag.h for good. Nov 4, 2012
e_hypotl.c [BZ #157] Remove include/stub-tag.h for good. Nov 4, 2012
e_j0l.c [BZ #157] Remove include/stub-tag.h for good. Nov 4, 2012
e_j1l.c [BZ #157] Remove include/stub-tag.h for good. Nov 4, 2012
e_jnl.c [BZ #157] Remove include/stub-tag.h for good. Nov 4, 2012
e_lgammal_r.c [BZ #157] Remove include/stub-tag.h for good. Nov 4, 2012
e_log10l.c [BZ #157] Remove include/stub-tag.h for good. Nov 4, 2012
e_log2l.c [BZ #157] Remove include/stub-tag.h for good. Nov 4, 2012
e_logl.c [BZ #157] Remove include/stub-tag.h for good. Nov 4, 2012
e_powl.c [BZ #157] Remove include/stub-tag.h for good. Nov 4, 2012
e_rem_pio2l.c [BZ #157] Remove include/stub-tag.h for good. Nov 4, 2012
e_scalb.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
e_scalbf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
e_scalbl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
e_sinhl.c [BZ #157] Remove include/stub-tag.h for good. Nov 4, 2012
e_sqrtl.c [BZ #157] Remove include/stub-tag.h for good. Nov 4, 2012
fclrexcpt.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
fedisblxcpt.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
feenablxcpt.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
fegetenv.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
fegetexcept.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
fegetround.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
feholdexcpt.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
fenv.h Update copyright dates with scripts/update-copyrights. Jan 4, 2016
fesetenv.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
fesetround.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
feupdateenv.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
fgetexcptflg.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
fpu_control.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
fraiseexcpt.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
fsetexcptflg.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
ftestexcept.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
gen-auto-libm-tests.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
gen-libm-have-vector-test.sh Update copyright dates with scripts/update-copyrights. Jan 4, 2016
gen-libm-test.pl Fix ulps regeneration for *-finite tests. Jan 19, 2016
ieee-math.c * hurd/hurdinit.c (map0): Remove [!PIC] conditional. Jun 16, 1996
k_casinh.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
k_casinhf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
k_casinhl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
k_cosl.c [BZ #157] Remove include/stub-tag.h for good. Nov 4, 2012
k_rem_pio2l.c [BZ #157] Remove include/stub-tag.h for good. Nov 4, 2012
k_sincosl.c Moved to csu/errno-loc.c. Dec 14, 2005
k_sinl.c [BZ #157] Remove include/stub-tag.h for good. Nov 4, 2012
k_tanl.c [BZ #157] Remove include/stub-tag.h for good. Nov 4, 2012
lgamma-compat.h Update copyright dates with scripts/update-copyrights. Jan 4, 2016
libm-test.inc Allow spurious underflow / inexact for ldbl-128ibm. Mar 10, 2016
math.h Update copyright dates with scripts/update-copyrights. Jan 4, 2016
multc3.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_asinhl.c [BZ #157] Remove include/stub-tag.h for good. Nov 4, 2012
s_atanl.c [BZ #157] Remove include/stub-tag.h for good. Nov 4, 2012
s_cacos.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_cacosf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_cacosh.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_cacoshf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_cacoshl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_cacosl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_casin.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_casinf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_casinh.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_casinhf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_casinhl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_casinl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_catan.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_catanf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_catanh.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_catanhf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_catanhl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_catanl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_cbrtl.c [BZ #157] Remove include/stub-tag.h for good. Nov 4, 2012
s_ccos.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_ccosf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_ccosh.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_ccoshf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_ccoshl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_ccosl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_cexp.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_cexpf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_cexpl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_clog.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_clog10.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_clog10f.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_clog10l.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_clogf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_clogl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_cpow.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_cpowf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_cpowl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_cproj.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_cprojf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_cprojl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_csin.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_csinf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_csinh.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_csinhf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_csinhl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_csinl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_csqrt.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_csqrtf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_csqrtl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_ctan.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_ctanf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_ctanh.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_ctanhf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_ctanhl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_ctanl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_erfl.c [BZ #157] Remove include/stub-tag.h for good. Nov 4, 2012
s_expm1l.c [BZ #157] Remove include/stub-tag.h for good. Nov 4, 2012
s_fdim.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_fdimf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_fdiml.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_fma.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_fmaf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_fmal.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_fmax.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_fmaxf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_fmaxl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_fmin.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_fminf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_fminl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_ldexp.c Make scalbn set errno (bug 6803). Sep 16, 2015
s_ldexpf.c Make scalbn set errno (bug 6803). Sep 16, 2015
s_ldexpl.c Make scalbn set errno (bug 6803). Sep 16, 2015
s_log1pl.c Set errno for log1p on pole/domain error. Apr 13, 2015
s_nan.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_nanf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_nanl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
s_nextafter.c Make nextafter, nexttoward set errno (bug 6799). Nov 2, 2015
s_nexttowardf.c Make nextafter, nexttoward set errno (bug 6799). Nov 2, 2015
s_nexttowardl.c Moved to csu/errno-loc.c. Dec 14, 2005
s_significand.c Remove __STDC__ conditionals from libm. Jan 27, 2012
s_significandf.c Remove __STDC__ conditionals from libm. Jan 27, 2012
s_significandl.c Remove __STDC__ conditionals from libm. Jan 27, 2012
s_tanhl.c [BZ #157] Remove include/stub-tag.h for good. Nov 4, 2012
setfpucw.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
t_sincosl.c Moved to csu/errno-loc.c. Dec 14, 2005
test-double-finite.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-double-vlen2.h Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-double-vlen4.h Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-double-vlen8.h Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-double.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-double.h Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-fenv-clear-main.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-fenv-clear.c Fix i386/x86_64 fesetenv SSE exception clearing (bug 19181). Oct 28, 2015
test-fenv-preserve.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-fenv-return.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-fenv-tls.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-fenv.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-fenvinline.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-float-finite.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-float-vlen16.h Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-float-vlen4.h Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-float-vlen8.h Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-float.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-float.h Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-fpucw-ieee-static.c Fix static-binary lazy FPU context allocation Sep 9, 2013
test-fpucw-ieee.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-fpucw-static.c Fix math/test-fpucw-*.c for sysdeps test-fpucw.c overrides. Jan 16, 2014
test-fpucw.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-idouble.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-ifloat.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-ildoubl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-ldouble-finite.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-ldouble.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-ldouble.h Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-math-errno.h Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-math-finite.h Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-math-inline.h Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-math-isinff.cc Don't use long double math functions if NO_LONG_DOUBLE Feb 24, 2016
test-math-no-finite.h Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-math-no-inline.h Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-math-scalar.h Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-math-vector.h Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-matherr.c Modify several tests to use test-skeleton.c Nov 5, 2014
test-misc.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-nan-overflow.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-nan-payload.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-nearbyint-except-2.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-nearbyint-except.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-powl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-signgam-finite-c11.c Fix finite-math-only lgamma functions signgam setting (bug 19211). Nov 5, 2015
test-signgam-finite-c99.c Fix compilation of test-signgam-* tests Mar 14, 2016
test-signgam-finite.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-signgam-main.c Fix compilation of test-signgam-* tests Mar 14, 2016
test-signgam-uchar-init-static.c Fix lgamma setting signgam for ISO C (bug 15421). Nov 20, 2015
test-signgam-uchar-init.c Fix lgamma setting signgam for ISO C (bug 15421). Nov 20, 2015
test-signgam-uchar-static.c Fix lgamma setting signgam for ISO C (bug 15421). Nov 20, 2015
test-signgam-uchar.c Fix lgamma setting signgam for ISO C (bug 15421). Nov 20, 2015
test-signgam-uint-init-static.c Fix lgamma setting signgam for ISO C (bug 15421). Nov 20, 2015
test-signgam-uint-init.c Fix lgamma setting signgam for ISO C (bug 15421). Nov 20, 2015
test-signgam-uint-static.c Fix lgamma setting signgam for ISO C (bug 15421). Nov 20, 2015
test-signgam-uint.c Fix lgamma setting signgam for ISO C (bug 15421). Nov 20, 2015
test-signgam-ullong-init-static.c Fix lgamma setting signgam for ISO C (bug 15421). Nov 20, 2015
test-signgam-ullong-init.c Fix lgamma setting signgam for ISO C (bug 15421). Nov 20, 2015
test-signgam-ullong-static.c Fix lgamma setting signgam for ISO C (bug 15421). Nov 20, 2015
test-signgam-ullong.c Fix lgamma setting signgam for ISO C (bug 15421). Nov 20, 2015
test-snan.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-tgmath-int.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-tgmath-ret.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-tgmath.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
test-tgmath2.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
tgmath.h Update copyright dates with scripts/update-copyrights. Jan 4, 2016
tst-CMPLX.c Don't disable CMPLXL macro for __NO_LONG_DOUBLE_MATH (bug 15488). May 18, 2013
tst-CMPLX2.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
tst-definitions.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_acos.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_acosf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_acosh.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_acoshf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_acoshl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_acosl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_asin.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_asinf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_asinl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_atan2.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_atan2f.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_atan2l.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_atanh.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_atanhf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_atanhl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_cosh.c This patch renames all uses of __isinf*, __isnan*, __finite* and __si… Jun 3, 2015
w_coshf.c This patch renames all uses of __isinf*, __isnan*, __finite* and __si… Jun 3, 2015
w_coshl.c This patch renames all uses of __isinf*, __isnan*, __finite* and __si… Jun 3, 2015
w_exp10.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_exp10f.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_exp10l.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_exp2.c This patch renames all uses of __isinf*, __isnan*, __finite* and __si… Jun 3, 2015
w_exp2f.c This patch renames all uses of __isinf*, __isnan*, __finite* and __si… Jun 3, 2015
w_exp2l.c This patch renames all uses of __isinf*, __isnan*, __finite* and __si… Jun 3, 2015
w_expl.c Moved to csu/errno-loc.c. Dec 14, 2005
w_fmod.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_fmodf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_fmodl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_hypot.c This patch renames all uses of __isinf*, __isnan*, __finite* and __si… Jun 3, 2015
w_hypotf.c This patch renames all uses of __isinf*, __isnan*, __finite* and __si… Jun 3, 2015
w_hypotl.c This patch renames all uses of __isinf*, __isnan*, __finite* and __si… Jun 3, 2015
w_ilogb.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_ilogbf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_ilogbl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_j0.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_j0f.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_j0l.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_j1.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_j1f.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_j1l.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_jn.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_jnf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_jnl.c This patch renames all uses of __isinf*, __isnan*, __finite* and __si… Jun 3, 2015
w_lgamma.c Fix lgamma setting signgam for ISO C (bug 15421). Nov 20, 2015
w_lgamma_compat.c Fix lgamma setting signgam for ISO C (bug 15421). Nov 20, 2015
w_lgamma_compatf.c Fix lgamma setting signgam for ISO C (bug 15421). Nov 20, 2015
w_lgamma_compatl.c Fix lgamma setting signgam for ISO C (bug 15421). Nov 20, 2015
w_lgamma_main.c Fix lgamma setting signgam for ISO C (bug 15421). Nov 20, 2015
w_lgamma_r.c This patch renames all uses of __isinf*, __isnan*, __finite* and __si… Jun 3, 2015
w_lgammaf.c Fix lgamma setting signgam for ISO C (bug 15421). Nov 20, 2015
w_lgammaf_main.c Fix lgamma setting signgam for ISO C (bug 15421). Nov 20, 2015
w_lgammaf_r.c This patch renames all uses of __isinf*, __isnan*, __finite* and __si… Jun 3, 2015
w_lgammal.c Fix lgamma setting signgam for ISO C (bug 15421). Nov 20, 2015
w_lgammal_main.c Fix lgamma setting signgam for ISO C (bug 15421). Nov 20, 2015
w_lgammal_r.c This patch renames all uses of __isinf*, __isnan*, __finite* and __si… Jun 3, 2015
w_log.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_log10.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_log10f.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_log10l.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_log1p.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_log1pf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_log1pl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_log2.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_log2f.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_log2l.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_logf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_logl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_pow.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_powf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_powl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_remainder.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_remainderf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_remainderl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_scalb.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_scalbf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_scalbl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_scalbln.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_scalblnf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_scalblnl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_sinh.c This patch renames all uses of __isinf*, __isnan*, __finite* and __si… Jun 3, 2015
w_sinhf.c This patch renames all uses of __isinf*, __isnan*, __finite* and __si… Jun 3, 2015
w_sinhl.c This patch renames all uses of __isinf*, __isnan*, __finite* and __si… Jun 3, 2015
w_sqrt.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_sqrtf.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_sqrtl.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
w_tgamma.c Cleanup a few cases where isinf is used to get the signbit to improve… Sep 18, 2015
w_tgammaf.c Cleanup a few cases where isinf is used to get the signbit to improve… Sep 18, 2015
w_tgammal.c Cleanup a few cases where isinf is used to get the signbit to improve… Sep 18, 2015

README.libm-test

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 independent of the target
platform and the specific real floating type and format and contains
placeholder test "templates" for math functions defined in libm.
The file, along with a generated file named "auto-libm-test-out",
is preprocessed by the Perl script "gen-libm-test.pl" to expand
the templates and produce a set of test cases for each math function
that are specific to the target platform but still independent of
the real floating type.  The results of the processing are
"libm-test.c" and a file "libm-test-ulps.h" with platform specific
deltas by which the actual math function results may deviate from
the expected results and still be considered correct.

The test drivers "test-double.c", "test-float.c", and "test-ldouble.c"
test the normal double, float and long double implementation of libm.
The test drivers with an 'i' in their name ("test-idouble.c",
"test-ifloat.c", and "test-ildoubl.c") test the corresponding inline
functions (where available - otherwise they also test the real
functions in libm).  Each driver selects the desired real floating
type to exercise the math functions to test with (float, double, or
long double) by defining a small set of macros just before including
the generic "libm-test.c" file.  Each driver also either defines or
undefines the __NO_MATH_INLINES macro just before including
"libm-test.c" to select either the real or inline functions,
respectively.  Each driver is compiled into a single executable test
program with the corresponding name.

As mentioned above, the "gen-libm-test.pl" script looks for a file
named "libm-test-ulps" in the platform specific sysdep directory (or
its fpu or nofpu subdirectory) and for each variant (real floating
type and rounding mode) of every tested function reads from it the
maximum difference expressed as Units of Least Precision (ULP) the
actual result of the function may deviate from the expected result
before it's considered incorrect.

The "auto-libm-test-out" file contains sets of test cases to exercise,
the conditions under which to exercise each, and the expected results.
The file is generated by the "gen-auto-libm-tests" program from the
"auto-libm-test-in" file.  See the comments in gen-auto-libm-tests.c
for details about the content and format of the -in and -out files.

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)

How to read the test output
===========================

Running each test on its own at the default level of verbosity will
print on stdout a line describing the implementation of math functions
exercised by the test (float, double, or long double), along with
whether the inline set has been selected, regardless of whether or
not any inline functions actually exist.  This is then followed by
the details of test failures (if any).  The output concludes by
a summary listing the number of test cases exercised and the number
of test failures uncovered.

For each test failure (and for each test case at higher levels of
verbosity), the output contains the name of the function under test
and its arguments or conditions that triggered the failure.  Note
that the name of the function in the output need not correspond
exactly to the name of the math function actually invoked. For example,
the output will refer to the "acos" function even if the actual function
under test is acosf (for the float version) or acosl (for the long
double version).  Also note that the function arguments may be shown
in either the decimal or the  hexadecimal floating point format which
may or may not correspond to the format used in the auto-libm-test-in
file. Besides the name of the function, for each test failure the
output contains the actual and expected results and the difference
between the two, printed in both the decimal and hexadecimal
floating point format, and the ULP and maximum ULP for the test
case.