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/usr/include/atlas/atlas_zr1.h is in libatlas-dev 3.8.4-3build1.

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#ifndef ATLAS_ZR1_H
#define ATLAS_ZR1_H

#define ATL_L1r1elts 1024
#define ATL_r1MU 2
#define ATL_r1NU 1

#define ATL_GetPartR1(A_, lda_, mb_, nb_) \
{ \
   (mb_) = (ATL_L1r1elts - (ATL_r1NU+ATL_r1NU)) / (ATL_r1NU+ATL_r1NU+1); \
   if ((mb_) > ATL_r1MU) (mb_) = ATL_r1MU*((mb_)/ATL_r1MU); \
   else (mb_) = ATL_r1MU; \
   (nb_) = ATL_r1NU; \
}

#endif