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[PATCH, rs6000, testsuite] Skip gfortran.dg/round_4.f90 for PowerPC Linux


Hi,

The test in gfortran.dg/round_4.f90, introduced in GCC 4.9, checks for
correct behavior of different rounding modes.  However, for
quad-precision floating-point, it requires that the number
0.10000000000000000000000000000000000481 be exactly represented.  Since
the PowerPC long double implementation (double-double) only guarantees
31 bits of precision, the test fails for the real(qp) portions of the
test.  Thus this patch marks the test invalid for PowerPC Linux for now.
(We may want to also do this for other subtargets; let me know if so.)

At such time as IEEE 128-bit floating-point is supported by the PowerPC
port, we should revisit this.

Is this ok for trunk and 4.9?

Thanks,
Bill


2014-06-29  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	* gfortran.dg/round_4.f90: Skip for powerpc*-*-linux* since the
	test requires greater precision than the current PowerPC long
	double implementation supports.


Index: gcc/testsuite/gfortran.dg/round_4.f90
===================================================================
--- gcc/testsuite/gfortran.dg/round_4.f90	(revision 212074)
+++ gcc/testsuite/gfortran.dg/round_4.f90	(working copy)
@@ -1,6 +1,7 @@
 ! { dg-do run }
 ! { dg-add-options ieee }
 ! { dg-skip-if "PR libfortran/58015" { hppa*-*-hpux* } }
+! { dg-skip-if "IBM long double 31 bits of precision, test requires 38" { powerpc*-*-linux* } }
 !
 ! PR fortran/35862
 !



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