http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51057
--- Comment #7 from Steve Kargl <sgk at troutmask dot apl.washington.edu> 2011-12-03 22:24:30 UTC --- On Sat, Dec 03, 2011 at 10:01:22PM +0000, dominiq at lps dot ens.fr wrote: > > --- Comment #6 from Dominique d'Humieres <dominiq at lps dot ens.fr> > 2011-12-03 22:01:22 UTC --- > The main problem with this test is not ppc platform implementing real(16) as > two real(8), but rather platforms that don't have sqrtl (see > http://gcc.gnu.org/ml/fortran/2011-11/msg00079.html ). Did you read the thread? I specifically recommended that the testcase should be XFAILed for the missing sqrtl, too; because no one is going to implement a suitable sqrtl in c99_functions.c. > Now this test has been motivated by the libquadmath, but is not specific and I > don't see why it should be xfailed if real(16) is available on a platform as > long as it gives a sensible answer as it is the case for ppc. The test is designed to test float128 (aka IEEE 754 binary 128 format). Double-double math gives you 106 bits of precision, which means it is impossible to meet the requirements of a 113 bit precision type. Lowering the accuracy of the test to allow ppc to pass opens up the possibility of missing a bug in libquadmath when someone makes a change to the library.
