glibc/math
Joseph Myers 1c7a4a51a3 soft-fp: Fix _FP_FMA when product is zero and third argument is finite (bug 17932).
soft-fp's _FP_FMA fails to set the result's exponent for cases where
the result of the multiplication is 0, yielding incorrect (arbitrary,
depending on uninitialized values) results for those cases.  This
affects libm for architectures using soft-fp to implement fma.  This
patch adds the exponent setting and tests for this case.

Tested for ARM soft-float (which uses soft-fp fma), x86_64 and x86 (to
verify not introducing new libm test failures there).

(This bug showed up in testing my patch to move the Linux kernel to
current soft-fp.  math/Makefile has "override CFLAGS +=
-Wno-uninitialized" which would have stopped compiler warnings from
showing up this problem, although I wouldn't be surprised if removing
that shows spurious warnings from this code, if the compiler fails to
follow that various cases where the exponent is uninitialized don't
need it initialized because the class is set to a value meaning the
uninitialized exponent isn't used.)

	[BZ #17932]
	* soft-fp/op-common.h (_FP_FMA): Set exponent of result in case
	where multiplication results in zero and third argument is finite
	and nonzero.
	* math/auto-libm-test-in: Add more tests of fma.
	* math/auto-libm-test-out: Regenerated.
2015-02-06 15:44:07 +00:00
..
bits Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
machine
atest-exp2.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
atest-exp.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
atest-sincos.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
auto-libm-test-in soft-fp: Fix _FP_FMA when product is zero and third argument is finite (bug 17932). 2015-02-06 15:44:07 +00:00
auto-libm-test-out soft-fp: Fix _FP_FMA when product is zero and third argument is finite (bug 17932). 2015-02-06 15:44:07 +00:00
basic-test.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
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 dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
cabsf.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
cabsl.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
carg.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
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cimag.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
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cimagl.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
complex.h Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
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crealf.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
creall.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
divtc3.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
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
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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
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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 dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
fedisblxcpt.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
feenablxcpt.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
fegetenv.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
fegetexcept.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
fegetround.c Fix libm fegetround namespace (bug 17748). 2015-01-02 20:44:42 +00:00
feholdexcpt.c Fix libm feholdexcept namespace (bug 17748). 2015-01-05 23:06:14 +00:00
fenv.h Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
fesetenv.c Fix libm fesetenv namespace (bug 17748). 2015-01-06 23:36:20 +00:00
fesetround.c Fix libm fesetround namespace (bug 17748). 2015-01-07 00:41:23 +00:00
feupdateenv.c Fix libm feupdateenv namespace (bug 17748). 2015-01-07 19:01:20 +00:00
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fpu_control.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
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gen-auto-libm-tests.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
gen-libm-test.pl Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
ieee-math.c
k_casinh.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
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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 ldbl-96 scalblnl underflowing results (bug 17803). 2015-01-12 23:02:14 +00:00
Makefile Remove duplicated -frounding-math 2015-01-06 06:32:03 -08:00
math.h Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
multc3.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
README.libm-test Clarify math/README.libm-test. Add "How to read the test output." 2015-01-28 21:07:01 -07:00
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
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s_ldexp.c Remove __STDC__ conditionals from libm. 2012-01-27 17:29:45 +00:00
s_ldexpf.c Don't use INTDEF with __ldexpf (bug 14132). 2014-10-21 23:11:49 +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 dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
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s_nanl.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
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 dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
t_sincosl.c
test-double.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
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test-float.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
test-fpucw-ieee-static.c Fix static-binary lazy FPU context allocation 2013-09-09 22:36:57 +01:00
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test-fpucw-static.c Fix math/test-fpucw-*.c for sysdeps test-fpucw.c overrides. 2014-01-16 05:30:52 +00:00
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tgmath.h Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
tst-CMPLX2.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +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-definitions.c Update copyright dates with scripts/update-copyrights. 2015-01-02 16:29:47 +00:00
Versions New <math.h> macro named issignaling to check for a signaling NaN (sNaN). 2013-04-02 13:51:02 +02:00
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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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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.