lib/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2025-07-28 00:21:52 +03:00
Code Activity

Allow spurious underflow / inexact for ldbl-128ibm.

Browse Source 
A large number of the test-ldouble failures seen for ldbl-128ibm are
spurious "underflow" and "inexact" exceptions.  These arise from such
exceptions in the underlying arithmetic; unlike other spurious
exceptions from that arithmetic, they do not in general relate to
cases where the returned result is also substantially inaccurate, are
not so readily avoidable by appropriately conditional libgcc patches,
and are widespread enough to be hard to handle through individual
XFAILing of the affected tests.

Thus, this patch documents relaxed accuracy goals for libm functions
for IBM long double and makes libm-test.inc reflect these spurious
exceptions in ldbl-128ibm arithmetic and always allow them in
ldbl-128ibm testing (while still not allowing these exceptions to be
missing where required to be present).  Tested for powerpc.

	* manual/math.texi (Errors in Math Functions): Document relaxed
	accuracy goals for IBM long double.
	* math/libm-test.inc (test_exceptions): Always allow spurious
	"underflow" and "inexact" exceptions for IBM long double.
This commit is contained in:
Joseph Myers
2016-03-10 23:48:46 +00:00
parent 6aa3e97e25
commit b55b28e657
3 changed files with 26 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
math/libm-test.inc
View File

@ -672,13 +672,20 @@ test_exceptions (const char *test_name, int exception)
test_single_exception (test_name, exception, OVERFLOW_EXCEPTION,
FE_OVERFLOW, "Overflow");
#endif
/* Spurious "underflow" and "inexact" exceptions are always
allowed for IBM long double, in line with the underlying
arithmetic. */
#ifdef FE_UNDERFLOW
if ((exception & UNDERFLOW_EXCEPTION_OK) == 0)
if ((exception & UNDERFLOW_EXCEPTION_OK) == 0
&& !(TEST_COND_ldbl_128ibm
&& (exception & UNDERFLOW_EXCEPTION) == 0))
test_single_exception (test_name, exception, UNDERFLOW_EXCEPTION,
FE_UNDERFLOW, "Underflow");
#endif
#ifdef FE_INEXACT
if ((exception & (INEXACT_EXCEPTION | NO_INEXACT_EXCEPTION)) != 0)
if ((exception & (INEXACT_EXCEPTION | NO_INEXACT_EXCEPTION)) != 0
&& !(TEST_COND_ldbl_128ibm
&& (exception & NO_INEXACT_EXCEPTION) != 0))
test_single_exception (test_name, exception, INEXACT_EXCEPTION,
FE_INEXACT, "Inexact");
#endif