Building netlib blas test and linking with BLIS signals an incorrect IEEE_UNDERFLOW_FLAG IEEE_DENORMAL warning when running xblat3d on Intel Broadwell.

Flags for building BLAS test routines:
-O0 -frecursive -std=legacy -mieee-fp -fno-trapping-math -fno-math-errno -march=native

BLIS built by EasyBuild in gobff/2020b toolchain.

./xblat3d < dblat3.in
Note: The following floating-point exceptions are signalling: IEEE_UNDERFLOW_FLAG IEEE_DENORMAL

This does not happen with refblas or OpenBlas/0.3.12.

It does not happen when running on AMD EPYC 7302P, nor on Skylake.