Some original discussion was in #840

Parts or all of the following tests fail when compiled with PGI compilers, but only for certain types of hardware:

Test_Cluster_RandomSieve/Test_Error.dat
Test_Cluster_Sieve/Test_Error.dat
Test_Cluster_SymmRMSD/Test_Error.dat
Test_CurveFit/Test_Error.dat
Test_EvalPlateau/Test_Error.dat
Test_GIST/Test_Error.dat

Failures occur on the following platforms:

• Intel(R) Xeon(R) Gold 6130 CPU @ 2.10GHz

Failures do not occur on the following platforms:

• Intel(R) Xeon(R) CPU E5-2670 0 @ 2.60GHz

It's possible the failures are optimization-related; e.g. the Intel 6130 supports AVX-512 while the E5-2670 does not. I will try compiling with no optimizations and see if the test failures go away.