mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-27 07:20:11 +00:00
e02920bc02
In non-default rounding modes, tgamma can be slightly less accurate than permitted by glibc's accuracy goals. Part of the problem is error accumulation, addressed in this patch by setting round-to-nearest for internal computations. However, there was also a bug in the code dealing with computing pow (x + n, x + n) where x + n is not exactly representable, providing another source of error even in round-to-nearest mode; it was necessary to address both bugs to get errors for all testcases within glibc's accuracy goals. Given this second fix, accuracy in round-to-nearest mode is also improved (hence regeneration of ulps for tgamma should be from scratch - truncate libm-test-ulps or at least remove existing tgamma entries - so that the expected ulps can be reduced). Some additional complications also arose. Certain tgamma tests should strictly, according to IEEE semantics, overflow or not depending on the rounding mode; this is beyond the scope of glibc's accuracy goals for any function without exactly-determined results, but gen-auto-libm-tests doesn't handle being lax there as it does for underflow. (libm-test.inc also doesn't handle being lax about whether the result in cases very close to the overflow threshold is infinity or a finite value close to overflow, but that doesn't cause problems in this case though I've seen it cause problems with random test generation for some functions.) Thus, spurious-overflow markings, with a comment, are added to auto-libm-test-in (no bug in Bugzilla because the issue is with the testsuite, not a user-visible bug in glibc). And on x86, after the patch I saw ERANGE issues as previously reported by Carlos (see my commentary in <https://sourceware.org/ml/libc-alpha/2015-01/msg00485.html>), which needed addressing by ensuring excess range and precision were eliminated at various points if FLT_EVAL_METHOD != 0. I also noticed and fixed a cosmetic issue where 1.0f was used in long double functions and should have been 1.0L. This completes the move of all functions to testing in all rounding modes with ALL_RM_TEST, so gen-libm-have-vector-test.sh is updated to remove the workaround for some functions not using ALL_RM_TEST. Tested for x86_64, x86, mips64 and powerpc. [BZ #18613] * sysdeps/ieee754/dbl-64/e_gamma_r.c (gamma_positive): Take log of X_ADJ not X when adjusting exponent. (__ieee754_gamma_r): Do intermediate computations in round-to-nearest then adjust overflowing and underflowing results as needed. * sysdeps/ieee754/flt-32/e_gammaf_r.c (gammaf_positive): Take log of X_ADJ not X when adjusting exponent. (__ieee754_gammaf_r): Do intermediate computations in round-to-nearest then adjust overflowing and underflowing results as needed. * sysdeps/ieee754/ldbl-128/e_gammal_r.c (gammal_positive): Take log of X_ADJ not X when adjusting exponent. (__ieee754_gammal_r): Do intermediate computations in round-to-nearest then adjust overflowing and underflowing results as needed. Use 1.0L not 1.0f as numerator of division. * sysdeps/ieee754/ldbl-128ibm/e_gammal_r.c (gammal_positive): Take log of X_ADJ not X when adjusting exponent. (__ieee754_gammal_r): Do intermediate computations in round-to-nearest then adjust overflowing and underflowing results as needed. Use 1.0L not 1.0f as numerator of division. * sysdeps/ieee754/ldbl-96/e_gammal_r.c (gammal_positive): Take log of X_ADJ not X when adjusting exponent. (__ieee754_gammal_r): Do intermediate computations in round-to-nearest then adjust overflowing and underflowing results as needed. Use 1.0L not 1.0f as numerator of division. * math/libm-test.inc (tgamma_test_data): Remove one test. Moved to auto-libm-test-in. (tgamma_test): Use ALL_RM_TEST. * math/auto-libm-test-in: Add one test of tgamma. Mark some other tests of tgamma with spurious-overflow. * math/auto-libm-test-out: Regenerated. * math/gen-libm-have-vector-test.sh: Do not check for START. * sysdeps/i386/fpu/libm-test-ulps: Update. * sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
53 lines
2.0 KiB
Bash
53 lines
2.0 KiB
Bash
#!/bin/sh
|
|
# Copyright (C) 2014-2015 Free Software Foundation, Inc.
|
|
# This file is part of the GNU C Library.
|
|
|
|
# The GNU C Library is free software; you can redistribute it and/or
|
|
# modify it under the terms of the GNU Lesser General Public
|
|
# License as published by the Free Software Foundation; either
|
|
# version 2.1 of the License, or (at your option) any later version.
|
|
|
|
# The GNU C Library is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
# Lesser General Public License for more details.
|
|
|
|
# You should have received a copy of the GNU Lesser General Public
|
|
# License along with the GNU C Library; if not, see
|
|
# <http://www.gnu.org/licenses/>.
|
|
|
|
# Generate series of definitions used for vector math functions tests.
|
|
# TEST_VECTOR_* and WRAPPER_NAME are defined in vector math functions tests.
|
|
# *_VEC_SUFF is used in individual tests, as result of FUNC_TEST unfolding
|
|
# to avoid warnings / errors about undeclared functions.
|
|
print_defs()
|
|
{
|
|
echo "#if defined TEST_VECTOR_$1 && TEST_VECTOR_$1"
|
|
echo "# define HAVE_VECTOR_$1 1"
|
|
echo "# define ${1}_VEC_SUFF WRAPPER_NAME ($1)"
|
|
echo "WRAPPER_DECL$2 (WRAPPER_NAME ($1))"
|
|
echo "#else"
|
|
echo "# define HAVE_VECTOR_$1 0"
|
|
echo "# define ${1}_VEC_SUFF $1"
|
|
echo "#endif"
|
|
echo
|
|
}
|
|
|
|
for func in $(cat libm-test.inc | grep ALL_RM_TEST | grep -v define | grep -v RUN_TEST_LOOP_ff_f | grep -v RUN_TEST_LOOP_fFF_11 | sed -r "s/.*\(//; s/,.*//" ); do
|
|
print_defs ${func}
|
|
print_defs ${func}f
|
|
print_defs ${func}l
|
|
done
|
|
|
|
for func in $(cat libm-test.inc | grep ALL_RM_TEST | grep RUN_TEST_LOOP_ff_f | sed -r "s/.*\(//; s/,.*//" ); do
|
|
print_defs ${func} "_ff"
|
|
print_defs ${func}f "_ff"
|
|
print_defs ${func}l "_ff"
|
|
done
|
|
|
|
for func in $(cat libm-test.inc | grep ALL_RM_TEST | grep RUN_TEST_LOOP_fFF_11 | sed -r "s/.*\(//; s/,.*//" ); do
|
|
print_defs ${func} "_fFF"
|
|
print_defs ${func}f "_fFF"
|
|
print_defs ${func}l "_fFF"
|
|
done
|