glibc/math
Szabolcs Nagy 505b5b2922 Fix powf overflow handling in non-nearest rounding mode [BZ #23961]
The threshold value at which powf overflows depends on the rounding mode
and the current check did not take this into account. So when the result
was rounded away from zero it could become infinity without setting
errno to ERANGE.

Example: pow(0x1.7ac7cp+5, 23) is 0x1.fffffep+127 + 0.1633ulp

If the result goes above 0x1.fffffep+127 + 0.5ulp then errno is set,
which is fine in nearest rounding mode, but

  powf(0x1.7ac7cp+5, 23) is inf in upward rounding mode
  powf(-0x1.7ac7cp+5, 23) is -inf in downward rounding mode

and the previous implementation did not set errno in these cases.

The fix tries to avoid affecting the common code path or calling a
function that may introduce a stack frame, so float arithmetics is used
to check the rounding mode and the threshold is selected accordingly.

	[BZ #23961]
	* math/auto-libm-test-in: Add new test case.
	* math/auto-libm-test-out-pow: Regenerated.
	* sysdeps/ieee754/flt-32/e_powf.c (__powf): Fix overflow check.
2018-12-11 10:01:43 +00:00
..
bits Do not use const attribute for nan functions (bug 23277). 2018-06-12 16:57:26 +00:00
machine Update. 1999-07-14 00:54:57 +00:00
Makefile Patch to require Python 3.4 or later to build glibc. 2018-10-29 15:28:05 +00:00
README.libm-test Replace gen-libm-test.pl with gen-libm-test.py. 2018-08-09 15:34:12 +00:00
Versions Remove the error handling wrapper from pow 2018-11-21 09:58:36 +00:00
atest-exp.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
atest-exp2.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
atest-sincos.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
auto-libm-test-in Fix powf overflow handling in non-nearest rounding mode [BZ #23961] 2018-12-11 10:01:43 +00:00
auto-libm-test-out-acos Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-acosh Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-asin Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-asinh Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-atan Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-atan2 Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-atanh Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-cabs Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-cacos Move tests of cacos, cacosh to auto-libm-test-*. 2017-02-17 17:44:23 +00:00
auto-libm-test-out-cacosh Move tests of cacos, cacosh to auto-libm-test-*. 2017-02-17 17:44:23 +00:00
auto-libm-test-out-carg Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-casin Move tests of casin, casinh to auto-libm-test-*. 2017-02-17 18:14:02 +00:00
auto-libm-test-out-casinh Move tests of casin, casinh to auto-libm-test-*. 2017-02-17 18:14:02 +00:00
auto-libm-test-out-catan XFAIL catan and catanh tests on ibm128 2017-03-16 10:36:37 -03:00
auto-libm-test-out-catanh XFAIL catan and catanh tests on ibm128 2017-03-16 10:36:37 -03:00
auto-libm-test-out-cbrt Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-ccos Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-ccosh Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-cexp Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-clog Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-clog10 Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-cos Improve float range reduction accuracy near pi/2 (bug 21094). 2017-03-15 22:00:54 +00:00
auto-libm-test-out-cosh Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-cpow Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-csin Move more csin, csinh tests to auto-libm-test-in. 2017-02-09 18:30:41 +00:00
auto-libm-test-out-csinh Move more csin, csinh tests to auto-libm-test-in. 2017-02-09 18:30:41 +00:00
auto-libm-test-out-csqrt Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-ctan Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-ctanh Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-erf Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-erfc Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-exp Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-exp2 Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-exp10 Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-expm1 Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-fma Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-hypot Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-j0 Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-j1 Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-jn Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-lgamma Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-log Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-log1p Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-log2 Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-log10 Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-narrow-add Add narrowing add functions. 2018-02-10 02:08:43 +00:00
auto-libm-test-out-narrow-div Add narrowing divide functions. 2018-05-17 00:40:52 +00:00
auto-libm-test-out-narrow-mul Add narrowing multiply functions. 2018-05-16 00:05:28 +00:00
auto-libm-test-out-narrow-sub Add narrowing subtract functions. 2018-03-20 00:34:52 +00:00
auto-libm-test-out-pow Fix powf overflow handling in non-nearest rounding mode [BZ #23961] 2018-12-11 10:01:43 +00:00
auto-libm-test-out-sin Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-sincos Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-sinh Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-sqrt Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-tan Improve float range reduction accuracy near pi/2 (bug 21094). 2017-03-15 22:00:54 +00:00
auto-libm-test-out-tanh Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-tgamma Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-y0 Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-y1 Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
auto-libm-test-out-yn Split auto-libm-test-out by function. 2017-02-06 18:41:20 +00:00
basic-test.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
bug-nextafter.c Remove NO_LONG_DOUBLE conditionals in libm tests (bug 21607). 2017-06-28 16:01:20 +00:00
bug-nexttoward.c Remove NO_LONG_DOUBLE conditionals in libm tests (bug 21607). 2017-06-28 16:01:20 +00:00
bug-tgmath1.c Update. 2004-05-07 02:14:18 +00:00
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divtc3.c Use copysign functions not __copysign functions in glibc libm. 2018-09-27 20:04:48 +00:00
e_exp2_template.c Move declare_mgen_finite_alias definition 2018-06-20 17:42:47 -03:00
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e_scalb.c Use rint functions not __rint functions in glibc libm. 2018-09-14 13:10:39 +00:00
e_scalbf.c Use rint functions not __rint functions in glibc libm. 2018-09-14 13:10:39 +00:00
e_scalbl.c Use rint functions not __rint functions in glibc libm. 2018-09-14 13:10:39 +00:00
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fraiseexcpt.c Move fenv.h soft-float inlines from fenv_private.h to include/fenv.h. 2018-09-04 19:52:06 +00:00
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gen-auto-libm-tests.c Add narrowing divide functions. 2018-05-17 00:40:52 +00:00
gen-fromfp-tests-inputs Add fromfp functions. 2016-12-31 00:40:59 +00:00
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gen-libm-test.py Use gen-libm-test.py to generate ulps table for manual. 2018-10-24 20:34:31 +00:00
gen-tgmath-tests.py Split test-tgmath3 by function. 2018-05-18 17:30:18 +00:00
k_casinh_template.c Move math_check_force_underflow macros to separate math-underflow.h. 2018-05-10 00:53:04 +00:00
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libm-test-narrow-add.inc Add narrowing add functions. 2018-02-10 02:08:43 +00:00
libm-test-narrow-div.inc Add narrowing divide functions. 2018-05-17 00:40:52 +00:00
libm-test-narrow-mul.inc Add narrowing multiply functions. 2018-05-16 00:05:28 +00:00
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libm-test-nextdown.inc Move comment from libm-test-nextdown.inc to libm-test-nexttoward.inc. 2018-08-08 16:16:59 +00:00
libm-test-nexttoward.inc Replace gen-libm-test.pl with gen-libm-test.py. 2018-08-09 15:34:12 +00:00
libm-test-nextup.inc Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
libm-test-pow.inc Do not allow divide-by-zero exception for pow(+/- 0, -Inf). 2018-10-17 21:23:40 +00:00
libm-test-remainder.inc Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
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libm-test-rint.inc Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
libm-test-round.inc Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
libm-test-roundeven.inc Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
libm-test-scalb.inc Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
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libm-test-setpayload.inc Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
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libm-test-signbit.inc Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
libm-test-significand.inc Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
libm-test-sin.inc Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
libm-test-sincos.inc Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
libm-test-sinh.inc Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
libm-test-sqrt.inc Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
libm-test-support.c Replace gen-libm-test.pl with gen-libm-test.py. 2018-08-09 15:34:12 +00:00
libm-test-support.h Replace gen-libm-test.pl with gen-libm-test.py. 2018-08-09 15:34:12 +00:00
libm-test-tan.inc Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
libm-test-tanh.inc Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
libm-test-tgamma.inc Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
libm-test-totalorder.inc Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
libm-test-totalordermag.inc Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
libm-test-trunc.inc Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
libm-test-ufromfp.inc Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
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libm-test-y0.inc Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
libm-test-y1.inc Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
libm-test-yn.inc Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
math-narrow.h Do not include fenv_private.h in math_private.h. 2018-09-03 21:09:04 +00:00
math-svid-compat.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
math-underflow.h Move math_check_force_underflow macros to separate math-underflow.h. 2018-05-10 00:53:04 +00:00
math.h Fix parameter type in C++ version of iseqsig (bug 23171) 2018-05-24 13:12:39 -03:00
mul_split.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
mul_splitl.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
multc3.c Use copysign functions not __copysign functions in glibc libm. 2018-09-27 20:04:48 +00:00
s_cacos_template.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_cacosh_template.c Remove unnecessary math_private.h includes. 2018-09-28 21:53:33 +00:00
s_canonicalize_template.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_casin_template.c Remove unnecessary math_private.h includes. 2018-09-28 21:53:33 +00:00
s_casinh_template.c Remove unnecessary math_private.h includes. 2018-09-28 21:53:33 +00:00
s_catan_template.c Move math_check_force_underflow macros to separate math-underflow.h. 2018-05-10 00:53:04 +00:00
s_catanh_template.c Move math_check_force_underflow macros to separate math-underflow.h. 2018-05-10 00:53:04 +00:00
s_ccos_template.c Remove unnecessary math_private.h includes. 2018-09-28 21:53:33 +00:00
s_ccosh_template.c Move math_check_force_underflow macros to separate math-underflow.h. 2018-05-10 00:53:04 +00:00
s_cexp_template.c Move fenv.h soft-float inlines from fenv_private.h to include/fenv.h. 2018-09-04 19:52:06 +00:00
s_clog10_template.c Move math_check_force_underflow macros to separate math-underflow.h. 2018-05-10 00:53:04 +00:00
s_clog_template.c Move math_check_force_underflow macros to separate math-underflow.h. 2018-05-10 00:53:04 +00:00
s_cpow_template.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_cproj_template.c Remove unnecessary math_private.h includes. 2018-09-28 21:53:33 +00:00
s_csin_template.c Move fenv.h soft-float inlines from fenv_private.h to include/fenv.h. 2018-09-04 19:52:06 +00:00
s_csinh_template.c Move fenv.h soft-float inlines from fenv_private.h to include/fenv.h. 2018-09-04 19:52:06 +00:00
s_csqrt_template.c Move math_check_force_underflow macros to separate math-underflow.h. 2018-05-10 00:53:04 +00:00
s_ctan_template.c Move fenv.h soft-float inlines from fenv_private.h to include/fenv.h. 2018-09-04 19:52:06 +00:00
s_ctanh_template.c Move fenv.h soft-float inlines from fenv_private.h to include/fenv.h. 2018-09-04 19:52:06 +00:00
s_fdim_template.c Remove unnecessary math_private.h includes. 2018-09-28 21:53:33 +00:00
s_fma.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_fmaf.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_fmal.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_fmax_template.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_fmaxmag_template.c Remove unnecessary math_private.h includes. 2018-09-28 21:53:33 +00:00
s_fmin_template.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_fminmag_template.c Remove unnecessary math_private.h includes. 2018-09-28 21:53:33 +00:00
s_iscanonicall.c Add iscanonical. 2016-09-30 00:27:50 +00:00
s_iseqsig_template.c Remove unnecessary math_private.h includes. 2018-09-28 21:53:33 +00:00
s_ldexp_template.c Remove unnecessary math_private.h includes. 2018-09-28 21:53:33 +00:00
s_nan_template.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
s_nextafter.c Do not include math-barriers.h in math_private.h. 2018-05-11 15:11:38 +00:00
s_nextdown_template.c Remove unnecessary math_private.h includes. 2018-09-28 21:53:33 +00:00
s_nexttowardf.c Do not include math-barriers.h in math_private.h. 2018-05-11 15:11:38 +00:00
s_nexttowardl.c Moved to csu/errno-loc.c. 2005-12-14 15:06:39 +00:00
s_significand_template.c Add a generic significand implementation 2018-06-20 18:15:06 -03:00
setfpucw.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
t_sincosl.c Moved to csu/errno-loc.c. 2005-12-14 15:06:39 +00:00
test-arg-double.h Add test infrastructure for narrowing libm functions. 2018-02-09 21:55:48 +00:00
test-arg-float32x.h Add test infrastructure for narrowing libm functions. 2018-02-09 21:55:48 +00:00
test-arg-float64.h Add test infrastructure for narrowing libm functions. 2018-02-09 21:55:48 +00:00
test-arg-float64x.h Add test infrastructure for narrowing libm functions. 2018-02-09 21:55:48 +00:00
test-arg-float128.h Add test infrastructure for narrowing libm functions. 2018-02-09 21:55:48 +00:00
test-arg-ldouble.h Add test infrastructure for narrowing libm functions. 2018-02-09 21:55:48 +00:00
test-double-vlen2.h Don't redefine ROUNDING_TESTS_* in math/test-*-vlen*.h. 2018-08-22 15:22:06 +00:00
test-double-vlen4.h Don't redefine ROUNDING_TESTS_* in math/test-*-vlen*.h. 2018-08-22 15:22:06 +00:00
test-double-vlen8.h Don't redefine ROUNDING_TESTS_* in math/test-*-vlen*.h. 2018-08-22 15:22:06 +00:00
test-double.h Add test infrastructure for narrowing libm functions. 2018-02-09 21:55:48 +00:00
test-fe-snans-always-signal.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-femode-traps.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-femode.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-fenv-clear-main.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-fenv-clear.c Fix i386/x86_64 fesetenv SSE exception clearing (bug 19181). 2015-10-28 18:50:20 +00:00
test-fenv-preserve.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-fenv-return.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-fenv-tls.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-fenv.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-fenvinline.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-fesetexcept-traps.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-fesetexcept.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-fetestexceptflag.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-fexcept-traps.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-fexcept.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-finite-macros.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-float-vlen4.h Don't redefine ROUNDING_TESTS_* in math/test-*-vlen*.h. 2018-08-22 15:22:06 +00:00
test-float-vlen8.h Don't redefine ROUNDING_TESTS_* in math/test-*-vlen*.h. 2018-08-22 15:22:06 +00:00
test-float-vlen16.h Don't redefine ROUNDING_TESTS_* in math/test-*-vlen*.h. 2018-08-22 15:22:06 +00:00
test-float.h Add test infrastructure for narrowing libm functions. 2018-02-09 21:55:48 +00:00
test-float32.h Add test infrastructure for narrowing libm functions. 2018-02-09 21:55:48 +00:00
test-float32x.h Add test infrastructure for narrowing libm functions. 2018-02-09 21:55:48 +00:00
test-float64.h Add test infrastructure for narrowing libm functions. 2018-02-09 21:55:48 +00:00
test-float64x.h Add test infrastructure for narrowing libm functions. 2018-02-09 21:55:48 +00:00
test-float128.h Add test infrastructure for narrowing libm functions. 2018-02-09 21:55:48 +00:00
test-flt-eval-method.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-fp-ilogb-constants.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-fp-llogb-constants.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-fpucw-ieee-static.c Fix static-binary lazy FPU context allocation 2013-09-09 22:36:57 +01:00
test-fpucw-ieee.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +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 dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-iseqsig-excess-precision.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-iszero-excess-precision.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-ldouble.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-math-cxx11.cc Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-math-errno.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-math-finite.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-math-floatn.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-math-inline.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-math-iscanonical.cc Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-math-iseqsig.cc Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-math-isinff.cc Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-math-issignaling.cc Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-math-iszero.cc Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-math-narrow.h Add test infrastructure for narrowing libm functions. 2018-02-09 21:55:48 +00:00
test-math-no-finite.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-math-no-inline.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-math-scalar.h Add test infrastructure for narrowing libm functions. 2018-02-09 21:55:48 +00:00
test-math-vector.h Add test infrastructure for narrowing libm functions. 2018-02-09 21:55:48 +00:00
test-matherr-2.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-matherr-3.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-matherr.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-misc.c Fix math/test-misc.c for undefined fenv.h macros. 2018-08-01 22:22:00 +00:00
test-nan-const.c Do not use const attribute for nan functions (bug 23277). 2018-06-12 16:57:26 +00:00
test-nan-overflow.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-nan-payload.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-narrow-macros.c Add test infrastructure for narrowing libm functions. 2018-02-09 21:55:48 +00:00
test-nearbyint-except-2.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-nearbyint-except.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-powl.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-signgam-finite-c11.c Fix finite-math-only lgamma functions signgam setting (bug 19211). 2015-11-05 21:23:07 +00:00
test-signgam-finite-c99.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-signgam-finite.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-signgam-main.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-signgam-uchar-init-static.c Fix lgamma setting signgam for ISO C (bug 15421). 2015-11-20 22:49:59 +00:00
test-signgam-uchar-init.c Fix lgamma setting signgam for ISO C (bug 15421). 2015-11-20 22:49:59 +00:00
test-signgam-uchar-static.c Fix lgamma setting signgam for ISO C (bug 15421). 2015-11-20 22:49:59 +00:00
test-signgam-uchar.c Fix lgamma setting signgam for ISO C (bug 15421). 2015-11-20 22:49:59 +00:00
test-signgam-uint-init-static.c Fix lgamma setting signgam for ISO C (bug 15421). 2015-11-20 22:49:59 +00:00
test-signgam-uint-init.c Fix lgamma setting signgam for ISO C (bug 15421). 2015-11-20 22:49:59 +00:00
test-signgam-uint-static.c Fix lgamma setting signgam for ISO C (bug 15421). 2015-11-20 22:49:59 +00:00
test-signgam-uint.c Fix lgamma setting signgam for ISO C (bug 15421). 2015-11-20 22:49:59 +00:00
test-signgam-ullong-init-static.c Fix lgamma setting signgam for ISO C (bug 15421). 2015-11-20 22:49:59 +00:00
test-signgam-ullong-init.c Fix lgamma setting signgam for ISO C (bug 15421). 2015-11-20 22:49:59 +00:00
test-signgam-ullong-static.c Fix lgamma setting signgam for ISO C (bug 15421). 2015-11-20 22:49:59 +00:00
test-signgam-ullong.c Fix lgamma setting signgam for ISO C (bug 15421). 2015-11-20 22:49:59 +00:00
test-snan.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-tgmath-int.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-tgmath-ret.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
test-tgmath.c Use volatile global counters in test-tgmath.c. 2018-04-19 12:32:50 +02:00
test-tgmath2.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tgmath.h Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-CMPLX.c Don't disable CMPLXL macro for __NO_LONG_DOUBLE_MATH (bug 15488). 2013-05-18 12:12:38 +00:00
tst-CMPLX2.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
tst-definitions.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
w_acos_compat.c Move fenv.h soft-float inlines from fenv_private.h to include/fenv.h. 2018-09-04 19:52:06 +00:00
w_acos_template.c Replace M_SUF (fabs) with M_FABS 2018-04-27 17:11:29 -03:00
w_acosf_compat.c Move fenv.h soft-float inlines from fenv_private.h to include/fenv.h. 2018-09-04 19:52:06 +00:00
w_acosh_compat.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
w_acosh_template.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
w_acoshf_compat.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
w_acoshl_compat.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
w_acosl_compat.c Move fenv.h soft-float inlines from fenv_private.h to include/fenv.h. 2018-09-04 19:52:06 +00:00
w_asin_compat.c Move fenv.h soft-float inlines from fenv_private.h to include/fenv.h. 2018-09-04 19:52:06 +00:00
w_asin_template.c Replace M_SUF (fabs) with M_FABS 2018-04-27 17:11:29 -03:00
w_asinf_compat.c Move fenv.h soft-float inlines from fenv_private.h to include/fenv.h. 2018-09-04 19:52:06 +00:00
w_asinl_compat.c Move fenv.h soft-float inlines from fenv_private.h to include/fenv.h. 2018-09-04 19:52:06 +00:00
w_atan2_compat.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
w_atan2_template.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
w_atan2f_compat.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
w_atan2l_compat.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
w_atanh_compat.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
w_atanh_template.c Replace M_SUF (fabs) with M_FABS 2018-04-27 17:11:29 -03:00
w_atanhf_compat.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
w_atanhl_compat.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
w_cosh_compat.c Use libm_alias_double in math/. 2017-09-15 23:10:02 +00:00
w_cosh_template.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
w_coshf_compat.c Use libm_alias_float in math/. 2017-09-15 17:12:02 +00:00
w_coshl_compat.c Use libm_alias_ldouble in math/. 2017-09-18 17:51:33 +00:00
w_exp.c Remove the error handling wrapper from exp and exp2 2018-11-21 09:55:02 +00:00
w_exp2.c Remove the error handling wrapper from exp and exp2 2018-11-21 09:55:02 +00:00
w_exp2_compat.c Remove the error handling wrapper from exp and exp2 2018-11-21 09:55:02 +00:00
w_exp2_template.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
w_exp2f.c Add libm_alias_*_other_r macros. 2017-10-10 21:29:11 +00:00
w_exp2f_compat.c New expf and exp2f version without SVID compat wrapper 2017-09-25 10:45:08 +01:00
w_exp2l_compat.c Use libm_alias_ldouble in math/. 2017-09-18 17:51:33 +00:00
w_exp10_compat.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
w_exp10_template.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
w_exp10f_compat.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
w_exp10l_compat.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
w_exp_compat.c Remove the error handling wrapper from exp and exp2 2018-11-21 09:55:02 +00:00
w_exp_template.c Replace hidden_def with libm_hidden_def in math 2018-04-30 11:45:54 -03:00
w_expf.c Add libm_alias_*_other_r macros. 2017-10-10 21:29:11 +00:00
w_expf_compat.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
w_expl_compat.c Replace hidden_def with libm_hidden_def in math 2018-04-30 11:45:54 -03:00
w_fmod_compat.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
w_fmod_template.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
w_fmodf_compat.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
w_fmodl_compat.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
w_hypot_compat.c Use libm_alias_double in math/. 2017-09-15 23:10:02 +00:00
w_hypot_template.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
w_hypotf_compat.c Use libm_alias_float in math/. 2017-09-15 17:12:02 +00:00
w_hypotl_compat.c Use libm_alias_ldouble in math/. 2017-09-18 17:51:33 +00:00
w_ilogb_template.c Move fenv.h soft-float inlines from fenv_private.h to include/fenv.h. 2018-09-04 19:52:06 +00:00
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w_j0l_compat.c Move fenv.h soft-float inlines from fenv_private.h to include/fenv.h. 2018-09-04 19:52:06 +00:00
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w_j1f_compat.c Move fenv.h soft-float inlines from fenv_private.h to include/fenv.h. 2018-09-04 19:52:06 +00:00
w_j1l_compat.c Move fenv.h soft-float inlines from fenv_private.h to include/fenv.h. 2018-09-04 19:52:06 +00:00
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w_jnf_compat.c Move fenv.h soft-float inlines from fenv_private.h to include/fenv.h. 2018-09-04 19:52:06 +00:00
w_jnl_compat.c Use libm_alias_ldouble in math/. 2017-09-18 17:51:33 +00:00
w_lgamma.c fix gamma symbol for static linking and new targets 2017-10-02 17:33:13 +01:00
w_lgamma_compat.c Fix lgamma setting signgam for ISO C (bug 15421). 2015-11-20 22:49:59 +00:00
w_lgamma_compat2.c Move w_lgamma to libm-compat-calls-auto 2017-02-08 17:40:11 -02:00
w_lgamma_compatf.c Fix lgamma setting signgam for ISO C (bug 15421). 2015-11-20 22:49:59 +00:00
w_lgamma_compatl.c Fix lgamma setting signgam for ISO C (bug 15421). 2015-11-20 22:49:59 +00:00
w_lgamma_main.c Use floor functions not __floor functions in glibc libm. 2018-09-14 13:09:01 +00:00
w_lgamma_r_compat.c Use floor functions not __floor functions in glibc libm. 2018-09-14 13:09:01 +00:00
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w_lgammaf_main.c Use floor functions not __floor functions in glibc libm. 2018-09-14 13:09:01 +00:00
w_lgammaf_r_compat.c Use floor functions not __floor functions in glibc libm. 2018-09-14 13:09:01 +00:00
w_lgammal.c fix gamma symbol for static linking and new targets 2017-10-02 17:33:13 +01:00
w_lgammal_compat2.c Move w_lgamma to libm-compat-calls-auto 2017-02-08 17:40:11 -02:00
w_lgammal_main.c Use floor functions not __floor functions in glibc libm. 2018-09-14 13:09:01 +00:00
w_lgammal_r_compat.c Use floor functions not __floor functions in glibc libm. 2018-09-14 13:09:01 +00:00
w_llogb_template.c Move fenv.h soft-float inlines from fenv_private.h to include/fenv.h. 2018-09-04 19:52:06 +00:00
w_log.c Remove the error handling wrapper from log 2018-11-21 09:56:27 +00:00
w_log1p_template.c Remove unnecessary math_private.h includes. 2018-09-28 21:53:33 +00:00
w_log2.c Remove the error handling wrapper from log2 2018-11-21 09:57:21 +00:00
w_log2_compat.c Remove the error handling wrapper from log2 2018-11-21 09:57:21 +00:00
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w_log2f.c Add libm_alias_*_other_r macros. 2017-10-10 21:29:11 +00:00
w_log2f_compat.c Move fenv.h soft-float inlines from fenv_private.h to include/fenv.h. 2018-09-04 19:52:06 +00:00
w_log2l_compat.c Move fenv.h soft-float inlines from fenv_private.h to include/fenv.h. 2018-09-04 19:52:06 +00:00
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w_log10l_compat.c Move fenv.h soft-float inlines from fenv_private.h to include/fenv.h. 2018-09-04 19:52:06 +00:00
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w_logf.c Add libm_alias_*_other_r macros. 2017-10-10 21:29:11 +00:00
w_logf_compat.c Move fenv.h soft-float inlines from fenv_private.h to include/fenv.h. 2018-09-04 19:52:06 +00:00
w_logl_compat.c Move fenv.h soft-float inlines from fenv_private.h to include/fenv.h. 2018-09-04 19:52:06 +00:00
w_pow.c Remove the error handling wrapper from pow 2018-11-21 09:58:36 +00:00
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w_powf.c Add libm_alias_*_other_r macros. 2017-10-10 21:29:11 +00:00
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w_remainder.c fix drem symbol for static linking and new targets 2017-10-03 14:31:59 +01:00
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w_scalbln_template.c Remove unnecessary math_private.h includes. 2018-09-28 21:53:33 +00:00
w_sinh_compat.c Use libm_alias_double in math/. 2017-09-15 23:10:02 +00:00
w_sinh_template.c Update copyright dates with scripts/update-copyrights. 2018-01-01 00:32:25 +00:00
w_sinhf_compat.c Use libm_alias_float in math/. 2017-09-15 17:12:02 +00:00
w_sinhl_compat.c Use libm_alias_ldouble in math/. 2017-09-18 17:51:33 +00:00
w_sqrt_compat.c Add support for sqrt asm redirects 2018-03-15 19:21:35 +00:00
w_sqrt_template.c Add support for sqrt asm redirects 2018-03-15 19:21:35 +00:00
w_sqrtf_compat.c Add support for sqrt asm redirects 2018-03-15 19:21:35 +00:00
w_sqrtl_compat.c Add support for sqrt asm redirects 2018-03-15 19:21:35 +00:00
w_tgamma_compat.c Use floor functions not __floor functions in glibc libm. 2018-09-14 13:09:01 +00:00
w_tgamma_template.c Use floor functions not __floor functions in glibc libm. 2018-09-14 13:09:01 +00:00
w_tgammaf_compat.c Use floor functions not __floor functions in glibc libm. 2018-09-14 13:09:01 +00:00
w_tgammal_compat.c Use floor functions not __floor functions in glibc libm. 2018-09-14 13:09:01 +00:00

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 Python
script "gen-libm-test.py" have some options.  A full list of options
is available with --help (for the test drivers) and -h for
"gen-libm-test.py".


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 files are "libm-test-<func>.inc".  They are independent of
the target platform and the specific real floating type and format and
contain placeholder test "templates" for math functions defined in
libm.  These files, along with generated files named
"auto-libm-test-out-<func>", are preprocessed by the Python script
"gen-libm-test.py" 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-<func>.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-<func>.c", "test-float-<func>.c", and
"test-ldouble-<func>.c", generated by the Makefile, test the normal
double, float and long double implementation of libm.  The test
drivers with an 'i' in their name ("test-idouble-<func>.c",
"test-ifloat-<func>.c", and "test-ildoubl-<func>.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-<func>.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.py" 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-<func>" files contain sets of test cases to
exercise, the conditions under which to exercise each, and the
expected results.  The files are 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.py" with the
file as input and ask to generate a pretty printed output in the file
"NewUlps":
  gen-libm-test.py -u ULPs -n NewUlps
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.py" 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-<func>.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
- "j" for long double.
- "a" for ARG_FLOAT, the argument type for narrowing functions.
- "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.
- "u" for unsigned int.
- "M" for intmax_t.
- "U" for uintmax_t.
- "p" for an argument (described in the previous character) passed
  through a pointer rather than directly.
- "F" for the address of a FLOAT (only as input parameter)
- "I" for the address of an int (only as input parameter)
- "1" for an additional output (either output through a pointer passed
  as an argument, or to a global variable such as signgam).

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.