diff --git a/blas/s_lapack_lib8.c b/blas/s_lapack_lib8.c
new file mode 100644
index 0000000..3b5239e
--- /dev/null
+++ b/blas/s_lapack_lib8.c
@@ -0,0 +1,872 @@
+/**************************************************************************************************
+*                                                                                                 *
+* This file is part of BLASFEO.                                                                   *
+*                                                                                                 *
+* BLASFEO -- BLAS For Embedded Optimization.                                                      *
+* Copyright (C) 2016-2017 by Gianluca Frison.                                                     *
+* Developed at IMTEK (University of Freiburg) under the supervision of Moritz Diehl.              *
+* All rights reserved.                                                                            *
+*                                                                                                 *
+* HPMPC is free software; you can redistribute it and/or                                          *
+* modify it under the terms of the GNU Lesser General Public                                      *
+* License as published by the Free Software Foundation; either                                    *
+* version 2.1 of the License, or (at your option) any later version.                              *
+*                                                                                                 *
+* HPMPC is distributed in the hope that it will be useful,                                        *
+* but WITHOUT ANY WARRANTY; without even the implied warranty of                                  *
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.                                            *
+* See the GNU Lesser General Public License for more details.                                     *
+*                                                                                                 *
+* You should have received a copy of the GNU Lesser General Public                                *
+* License along with HPMPC; if not, write to the Free Software                                    *
+* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA                  *
+*                                                                                                 *
+* Author: Gianluca Frison, giaf (at) dtu.dk                                                       *
+*                          gianluca.frison (at) imtek.uni-freiburg.de                             *
+*                                                                                                 *
+**************************************************************************************************/
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+
+#include "../include/blasfeo_common.h"
+#include "../include/blasfeo_s_aux.h"
+#include "../include/blasfeo_s_kernel.h"
+
+
+
+void spotrf_l_libstr(int m, struct s_strmat *sC, int ci, int cj, struct s_strmat *sD, int di, int dj)
+	{
+
+	if(m<=0)
+		return;
+
+	if(ci>0 | di>0)
+		{
+		printf("\nspotrf_l_libstr: feature not implemented yet: ci>0, di>0\n");
+		exit(1);
+		}
+
+	const int bs = 8;
+
+	int i, j;
+
+	int sdc = sC->cn;
+	int sdd = sD->cn;
+	float *pC = sC->pA + cj*bs;
+	float *pD = sD->pA + dj*bs;
+	float *dD = sD->dA; // XXX what to do if di and dj are not zero
+	if(di==0 & dj==0)
+		sD->use_dA = 1;
+	else
+		sD->use_dA = 0;
+
+	i = 0;
+#if defined(TARGET_X64_INTEL_HASWELL)
+	for(; i<m-23; i+=24)
+		{
+		j = 0;
+		for(; j<i; j+=8)
+			{
+			kernel_strsm_nt_rl_inv_24x4_lib8(j+0, &pD[i*sdd], sdd, &pD[0+j*sdd], &pC[(j+0)*bs+i*sdc], sdc, &pD[(j+0)*bs+i*sdd], sdd, &pD[0+(j+0)*bs+(j+0)*sdd], &dD[j+0]);
+			kernel_strsm_nt_rl_inv_24x4_lib8(j+4, &pD[i*sdd], sdd, &pD[4+j*sdd], &pC[(j+4)*bs+i*sdc], sdc, &pD[(j+4)*bs+i*sdd], sdd, &pD[4+(j+4)*bs+(j+0)*sdd], &dD[j+4]);
+			}
+		kernel_spotrf_nt_l_24x4_lib8((j+0), &pD[(i+0)*sdd], sdd, &pD[(j+0)*sdd], &pC[(j+0)*bs+(j+0)*sdc], sdc, &pD[(j+0)*bs+(j+0)*sdd], sdd, &dD[j+0]);
+		kernel_spotrf_nt_l_20x4_lib8((j+4), &pD[(i+0)*sdd], sdd, &pD[4+(j+0)*sdd], &pC[(j+4)*bs+(j+0)*sdc], sdc, &pD[(j+4)*bs+(j+0)*sdd], sdd, &dD[j+4]);
+		kernel_spotrf_nt_l_16x4_lib8((j+8), &pD[(i+8)*sdd], sdd, &pD[(j+8)*sdd], &pC[(j+8)*bs+(j+8)*sdc], sdc, &pD[(j+8)*bs+(j+8)*sdd], sdd, &dD[j+8]);
+		kernel_spotrf_nt_l_12x4_lib8((j+12), &pD[(i+8)*sdd], sdd, &pD[4+(j+8)*sdd], &pC[(j+12)*bs+(j+8)*sdc], sdc, &pD[(j+12)*bs+(j+8)*sdd], sdd, &dD[j+12]);
+		kernel_spotrf_nt_l_8x8_lib8(j+16, &pD[(i+16)*sdd], &pD[(j+16)*sdd], &pC[(j+16)*bs+(j+16)*sdc], &pD[(j+16)*bs+(j+16)*sdd], &dD[j+16]);
+		}
+	if(m>i)
+		{
+		if(m-i<=4)
+			{
+			goto left_4;
+			}
+		else if(m-i<=8)
+			{
+			goto left_8;
+			}
+		else if(m-i<=12)
+			{
+			goto left_12;
+			}
+		else if(m-i<=16)
+			{
+			goto left_16;
+			}
+		else
+			{
+			goto left_24;
+			}
+		}
+#else
+	for(; i<m-15; i+=16)
+		{
+		j = 0;
+		for(; j<i; j+=8)
+			{
+			kernel_strsm_nt_rl_inv_16x4_lib8(j+0, &pD[i*sdd], sdd, &pD[0+j*sdd], &pC[(j+0)*bs+i*sdc], sdc, &pD[(j+0)*bs+i*sdd], sdd, &pD[0+(j+0)*bs+(j+0)*sdd], &dD[j+0]);
+			kernel_strsm_nt_rl_inv_16x4_lib8(j+4, &pD[i*sdd], sdd, &pD[4+j*sdd], &pC[(j+4)*bs+i*sdc], sdc, &pD[(j+4)*bs+i*sdd], sdd, &pD[4+(j+4)*bs+(j+0)*sdd], &dD[j+4]);
+			}
+		kernel_spotrf_nt_l_16x4_lib8(j+0, &pD[i*sdd], sdd, &pD[0+j*sdd], &pC[(j+0)*bs+(j+0)*sdc], sdc, &pD[(j+0)*bs+(j+0)*sdd], sdd, &dD[j+0]);
+		kernel_spotrf_nt_l_12x4_lib8(j+4, &pD[i*sdd], sdd, &pD[4+j*sdd], &pC[(j+4)*bs+(j+0)*sdc], sdc, &pD[(j+4)*bs+(j+0)*sdd], sdd, &dD[j+4]);
+		kernel_spotrf_nt_l_8x8_lib8((j+8), &pD[(i+8)*sdd], &pD[(j+8)*sdd], &pC[(j+8)*bs+(j+8)*sdc], &pD[(j+8)*bs+(j+8)*sdd], &dD[j+8]);
+		}
+	if(m>i)
+		{
+		if(m-i<=8)
+			{
+			goto left_8;
+			}
+		else
+			{
+			goto left_16;
+			}
+		}
+#endif
+
+	// common return if i==m
+	return;
+
+	// clean up loops definitions
+
+#if defined(TARGET_X64_INTEL_HASWELL)
+	left_24: // 17 <= m <= 23
+	j = 0;
+	for(; j<i & j<m-7; j+=8)
+		{
+		kernel_strsm_nt_rl_inv_24x4_vs_lib8(j+0, &pD[i*sdd], sdd, &pD[0+j*sdd], &pC[(j+0)*bs+i*sdc], sdc, &pD[(j+0)*bs+i*sdd], sdd, &pD[0+(j+0)*bs+(j+0)*sdd], &dD[j+0], m-i, m-(j+0));
+		kernel_strsm_nt_rl_inv_24x4_vs_lib8(j+4, &pD[i*sdd], sdd, &pD[4+j*sdd], &pC[(j+4)*bs+i*sdc], sdc, &pD[(j+4)*bs+i*sdd], sdd, &pD[4+(j+4)*bs+(j+0)*sdd], &dD[j+4], m-i, m-(j+4));
+		}
+	kernel_spotrf_nt_l_24x4_vs_lib8((j+0), &pD[(i+0)*sdd], sdd, &pD[(j+0)*sdd], &pC[(j+0)*bs+(j+0)*sdc], sdc, &pD[(j+0)*bs+(j+0)*sdd], sdd, &dD[j+0], m-(i+0), m-(j+0));
+	kernel_spotrf_nt_l_20x4_vs_lib8((j+4), &pD[(i+0)*sdd], sdd, &pD[4+(j+0)*sdd], &pC[(j+4)*bs+(j+0)*sdc], sdc, &pD[(j+4)*bs+(j+0)*sdd], sdd, &dD[j+4], m-(i+0), m-(j+4));
+	kernel_spotrf_nt_l_16x4_vs_lib8((j+8), &pD[(i+8)*sdd], sdd, &pD[(j+8)*sdd], &pC[(j+8)*bs+(j+8)*sdc], sdc, &pD[(j+8)*bs+(j+8)*sdd], sdd, &dD[j+8], m-(i+8), m-(j+8));
+	kernel_spotrf_nt_l_12x4_vs_lib8((j+12), &pD[(i+8)*sdd], sdd, &pD[4+(j+8)*sdd], &pC[(j+12)*bs+(j+8)*sdc], sdc, &pD[(j+12)*bs+(j+8)*sdd], sdd, &dD[j+12], m-(i+8), m-(j+12));
+	if(j<m-20) // 21 - 23
+		{
+		kernel_spotrf_nt_l_8x8_vs_lib8(j+16, &pD[(i+16)*sdd], &pD[(j+16)*sdd], &pC[(j+16)*bs+(j+16)*sdc], &pD[(j+16)*bs+(j+16)*sdd], &dD[j+16], m-(i+16), m-(j+16));
+		}
+	else // 17 18 19 20
+		{
+		kernel_spotrf_nt_l_8x4_vs_lib8(j+16, &pD[(i+16)*sdd], &pD[(j+16)*sdd], &pC[(j+16)*bs+(j+16)*sdc], &pD[(j+16)*bs+(j+16)*sdd], &dD[j+16], m-(i+16), m-(j+16));
+		}
+	return;
+#endif
+
+	left_16: // 9 <= m <= 16
+	j = 0;
+	for(; j<i; j+=8)
+		{
+		kernel_strsm_nt_rl_inv_16x4_vs_lib8(j+0, &pD[i*sdd], sdd, &pD[0+j*sdd], &pC[(j+0)*bs+i*sdc], sdc, &pD[(j+0)*bs+i*sdd], sdd, &pD[0+(j+0)*bs+(j+0)*sdd], &dD[j+0], m-i, m-(j+0));
+		kernel_strsm_nt_rl_inv_16x4_vs_lib8(j+4, &pD[i*sdd], sdd, &pD[4+j*sdd], &pC[(j+4)*bs+i*sdc], sdc, &pD[(j+4)*bs+i*sdd], sdd, &pD[4+(j+4)*bs+(j+0)*sdd], &dD[j+4], m-i, m-(j+4));
+		}
+	kernel_spotrf_nt_l_16x4_vs_lib8(j+0, &pD[(i+0)*sdd], sdd, &pD[0+j*sdd], &pC[(j+0)*bs+j*sdc], sdc, &pD[(j+0)*bs+j*sdd], sdd, &dD[j+0], m-(i+0), m-(j+0));
+	kernel_spotrf_nt_l_12x4_vs_lib8(j+4, &pD[(i+0)*sdd], sdd, &pD[4+j*sdd], &pC[(j+4)*bs+j*sdc], sdc, &pD[(j+4)*bs+j*sdd], sdd, &dD[j+4], m-(i+0), m-(j+4));
+	if(j<m-12) // 13 - 16
+		{
+		kernel_spotrf_nt_l_8x8_vs_lib8((j+8), &pD[(i+8)*sdd], &pD[(j+8)*sdd], &pC[(j+8)*bs+(j+8)*sdc], &pD[(j+8)*bs+(j+8)*sdd], &dD[j+8], m-(i+8), m-(j+8));
+		}
+	else // 9 - 12
+		{
+		kernel_spotrf_nt_l_8x4_vs_lib8((j+8), &pD[(i+8)*sdd], &pD[(j+8)*sdd], &pC[(j+8)*bs+(j+8)*sdc], &pD[(j+8)*bs+(j+8)*sdd], &dD[j+8], m-(i+8), m-(j+8));
+		}
+	return;
+
+#if defined(TARGET_X64_INTEL_HASWELL)
+	left_12: // 9 <= m <= 12
+	j = 0;
+	for(; j<i; j+=8)
+		{
+		kernel_strsm_nt_rl_inv_8x8_vs_lib8(j, &pD[i*sdd], &pD[j*sdd], &pC[j*bs+i*sdc], &pD[j*bs+i*sdd], &pD[j*bs+j*sdd], &dD[j], m-i, m-j);
+		kernel_strsm_nt_rl_inv_4x8_vs_lib8(j, &pD[(i+8)*sdd], &pD[j*sdd], &pC[j*bs+(i+8)*sdc], &pD[j*bs+(i+8)*sdd], &pD[j*bs+j*sdd], &dD[j], m-(i+8), m-j);
+		}
+	kernel_spotrf_nt_l_8x8_vs_lib8(j, &pD[i*sdd], &pD[j*sdd], &pC[j*bs+j*sdc], &pD[j*bs+j*sdd], &dD[j], m-i, m-j);
+	kernel_strsm_nt_rl_inv_4x8_vs_lib8(j, &pD[(i+8)*sdd], &pD[j*sdd], &pC[j*bs+(i+8)*sdc], &pD[j*bs+(i+8)*sdd], &pD[j*bs+j*sdd], &dD[j], m-(i+8), m-j);
+	if(j<m-8) // 9 - 12
+		{
+		kernel_spotrf_nt_l_8x4_vs_lib8((j+8), &pD[(i+8)*sdd], &pD[(j+8)*sdd], &pC[(j+8)*bs+(j+8)*sdc], &pD[(j+8)*bs+(j+8)*sdd], &dD[(j+8)], m-(i+8), m-(j+8));
+		}
+	return;
+#endif
+
+	left_8: // 1 <= m <= 8
+	j = 0;
+	for(; j<i; j+=8)
+		{
+		kernel_strsm_nt_rl_inv_8x8_vs_lib8(j, &pD[i*sdd], &pD[j*sdd], &pC[j*bs+i*sdc], &pD[j*bs+i*sdd], &pD[j*bs+j*sdd], &dD[j], m-i, m-j);
+		}
+	if(j<m-4) // 5 - 8
+		{
+		kernel_spotrf_nt_l_8x8_vs_lib8(j, &pD[i*sdd], &pD[j*sdd], &pC[j*bs+j*sdc], &pD[j*bs+j*sdd], &dD[j], m-i, m-j);
+		}
+	else // 1 - 4
+		{
+		kernel_spotrf_nt_l_8x4_vs_lib8(j, &pD[i*sdd], &pD[j*sdd], &pC[j*bs+j*sdc], &pD[j*bs+j*sdd], &dD[j], m-i, m-j);
+		}
+	return;
+
+#if defined(TARGET_X64_INTEL_HASWELL)
+	left_4: // 1 <= m <= 4
+	j = 0;
+	for(; j<i; j+=8)
+		{
+		kernel_strsm_nt_rl_inv_4x8_vs_lib8(j, &pD[i*sdd], &pD[j*sdd], &pC[j*bs+i*sdc], &pD[j*bs+i*sdd], &pD[j*bs+j*sdd], &dD[j], m-i, m-j);
+		}
+	kernel_spotrf_nt_l_8x4_vs_lib8(j, &pD[i*sdd], &pD[j*sdd], &pC[j*bs+j*sdc], &pD[j*bs+j*sdd], &dD[j], m-i, m-j);
+	return;
+#endif
+
+	}
+
+
+
+void spotrf_l_mn_libstr(int m, int n, struct s_strmat *sC, int ci, int cj, struct s_strmat *sD, int di, int dj)
+	{
+
+	if(m<=0 | n<=0)
+		return;
+
+	if(ci>0 | di>0)
+		{
+		printf("\nspotrf_l_mn_libstr: feature not implemented yet: ci>0, di>0\n");
+		exit(1);
+		}
+
+	const int bs = 8;
+
+	int i, j;
+
+	int sdc = sC->cn;
+	int sdd = sD->cn;
+	float *pC = sC->pA + cj*bs;
+	float *pD = sD->pA + dj*bs;
+	float *dD = sD->dA; // XXX what to do if di and dj are not zero
+	if(di==0 & dj==0)
+		sD->use_dA = 1;
+	else
+		sD->use_dA = 0;
+
+	i = 0;
+#if defined(TARGET_X64_INTEL_HASWELL)
+	for(; i<m-23; i+=24)
+		{
+		j = 0;
+		for(; j<i & j<n-7; j+=8)
+			{
+			kernel_strsm_nt_rl_inv_24x4_lib8(j+0, &pD[i*sdd], sdd, &pD[0+j*sdd], &pC[(j+0)*bs+i*sdc], sdc, &pD[(j+0)*bs+i*sdd], sdd, &pD[0+(j+0)*bs+(j+0)*sdd], &dD[j+0]);
+			kernel_strsm_nt_rl_inv_24x4_lib8(j+4, &pD[i*sdd], sdd, &pD[4+j*sdd], &pC[(j+4)*bs+i*sdc], sdc, &pD[(j+4)*bs+i*sdd], sdd, &pD[4+(j+4)*bs+(j+0)*sdd], &dD[j+4]);
+			}
+		if(j<n)
+			{
+			if(i<j) // dtrsm
+				{
+				kernel_strsm_nt_rl_inv_24x4_vs_lib8(j+0, &pD[i*sdd], sdd, &pD[0+j*sdd], &pC[(j+0)*bs+i*sdc], sdc, &pD[(j+0)*bs+i*sdd], sdd, &pD[(j+0)*bs+(j+0)*sdd], &dD[j+0], m-i, n-(j+0));
+				if(j<n-4) // 5 6 7
+					{
+					kernel_strsm_nt_rl_inv_24x4_vs_lib8(j+4, &pD[i*sdd], sdd, &pD[4+j*sdd], &pC[(j+4)*bs+i*sdc], sdc, &pD[(j+4)*bs+i*sdd], sdd, &pD[(j+4)*bs+(j+4)*sdd], &dD[j+4], m-i, n-(j+4));
+					}
+				}
+			else // dpotrf
+				{
+				if(j<n-23)
+					{
+					kernel_spotrf_nt_l_24x4_lib8((j+0), &pD[(i+0)*sdd], sdd, &pD[(j+0)*sdd], &pC[(j+0)*bs+(j+0)*sdc], sdc, &pD[(j+0)*bs+(j+0)*sdd], sdd, &dD[j+0]);
+					kernel_spotrf_nt_l_20x4_lib8((j+4), &pD[(i+0)*sdd], sdd, &pD[4+(j+0)*sdd], &pC[(j+4)*bs+(j+0)*sdc], sdc, &pD[(j+4)*bs+(j+0)*sdd], sdd, &dD[j+4]);
+					kernel_spotrf_nt_l_16x4_lib8((j+8), &pD[(i+8)*sdd], sdd, &pD[(j+8)*sdd], &pC[(j+8)*bs+(j+8)*sdc], sdc, &pD[(j+8)*bs+(j+8)*sdd], sdd, &dD[j+8]);
+					kernel_spotrf_nt_l_12x4_lib8((j+12), &pD[(i+8)*sdd], sdd, &pD[4+(j+8)*sdd], &pC[(j+12)*bs+(j+8)*sdc], sdc, &pD[(j+12)*bs+(j+8)*sdd], sdd, &dD[j+12]);
+					kernel_spotrf_nt_l_8x8_lib8((j+16), &pD[(i+16)*sdd], &pD[(j+16)*sdd], &pC[(j+16)*bs+(j+16)*sdc], &pD[(j+16)*bs+(j+16)*sdd], &dD[j+16]);
+					}
+				else
+					{
+					if(j<n-4) // 5 - 23
+						{
+						kernel_spotrf_nt_l_24x4_vs_lib8((j+0), &pD[(i+0)*sdd], sdd, &pD[(j+0)*sdd], &pC[(j+0)*bs+(j+0)*sdc], sdc, &pD[(j+0)*bs+(j+0)*sdd], sdd, &dD[j+0], m-(i+0), n-(j+0));
+						kernel_spotrf_nt_l_20x4_vs_lib8((j+4), &pD[(i+0)*sdd], sdd, &pD[4+(j+0)*sdd], &pC[(j+4)*bs+(j+0)*sdc], sdc, &pD[(j+4)*bs+(j+0)*sdd], sdd, &dD[j+4], m-(i+0), n-(j+4));
+						if(j==n-8)
+							return;
+						if(j<n-12) // 13 - 23
+							{
+							kernel_spotrf_nt_l_16x4_vs_lib8((j+8), &pD[(i+8)*sdd], sdd, &pD[(j+8)*sdd], &pC[(j+8)*bs+(j+8)*sdc], sdc, &pD[(j+8)*bs+(j+8)*sdd], sdd, &dD[j+8], m-(i+8), n-(j+8));
+							kernel_spotrf_nt_l_12x4_vs_lib8((j+12), &pD[(i+8)*sdd], sdd, &pD[4+(j+8)*sdd], &pC[(j+12)*bs+(j+8)*sdc], sdc, &pD[(j+12)*bs+(j+8)*sdd], sdd, &dD[j+12], m-(i+8), n-(j+12));
+							if(j==n-16)
+								return;
+							if(j<n-20) // 21 - 23
+								{
+								kernel_spotrf_nt_l_8x8_vs_lib8(j+16, &pD[(i+16)*sdd], &pD[(j+16)*sdd], &pC[(j+16)*bs+(j+16)*sdc], &pD[(j+16)*bs+(j+16)*sdd], &dD[j+16], m-(i+16), n-(j+16));
+								}
+							else // 17 18 19 20
+								{
+								kernel_spotrf_nt_l_8x4_vs_lib8(j+16, &pD[(i+16)*sdd], &pD[(j+16)*sdd], &pC[(j+16)*bs+(j+16)*sdc], &pD[(j+16)*bs+(j+16)*sdd], &dD[j+16], m-(i+16), n-(j+16));
+								}
+							}
+						else // 9 10 11 12
+							{
+							kernel_spotrf_nt_l_16x4_vs_lib8(j+8, &pD[(i+8)*sdd], sdd, &pD[(j+8)*sdd], &pC[(j+8)*bs+(j+8)*sdc], sdc, &pD[(j+8)*bs+(j+8)*sdd], sdd, &dD[j+8], m-(i+8), n-(j+8));
+							}
+						}
+					else // 1 2 3 4
+						{
+						kernel_spotrf_nt_l_24x4_vs_lib8(j, &pD[(i+0)*sdd], sdd, &pD[j*sdd], &pC[j*bs+j*sdc], sdc, &pD[j*bs+j*sdd], sdd, &dD[j], m-(i+0), n-j);
+						}
+					}
+				}
+			}
+		}
+	if(m>i)
+		{
+		if(m-i<=8)
+			{
+			goto left_8;
+			}
+		else if(m-i<=16)
+			{
+			goto left_16;
+			}
+		else
+			{
+			goto left_24;
+			}
+		}
+#else
+	for(; i<m-15; i+=16)
+		{
+		j = 0;
+		for(; j<i & j<n-7; j+=8)
+			{
+			kernel_strsm_nt_rl_inv_16x4_lib8(j+0, &pD[i*sdd], sdd, &pD[0+j*sdd], &pC[(j+0)*bs+i*sdc], sdc, &pD[(j+0)*bs+i*sdd], sdd, &pD[0+(j+0)*bs+(j+0)*sdd], &dD[j+0]);
+			kernel_strsm_nt_rl_inv_16x4_lib8(j+4, &pD[i*sdd], sdd, &pD[4+j*sdd], &pC[(j+4)*bs+i*sdc], sdc, &pD[(j+4)*bs+i*sdd], sdd, &pD[4+(j+4)*bs+(j+0)*sdd], &dD[j+4]);
+			}
+		if(j<n)
+			{
+			if(i<j) // dtrsm
+				{
+				kernel_strsm_nt_rl_inv_16x4_vs_lib8(j+0, &pD[i*sdd], sdd, &pD[0+j*sdd], &pC[(j+0)*bs+i*sdc], sdc, &pD[(j+0)*bs+i*sdd], sdd, &pD[(j+0)*bs+(j+0)*sdd], &dD[j+0], m-i, n-(j+0));
+				if(j<n-4) // 5 6 7
+					{
+					kernel_strsm_nt_rl_inv_16x4_vs_lib8(j+4, &pD[i*sdd], sdd, &pD[4+j*sdd], &pC[(j+4)*bs+i*sdc], sdc, &pD[(j+4)*bs+i*sdd], sdd, &pD[(j+4)*bs+(j+4)*sdd], &dD[j+4], m-i, n-(j+4));
+					}
+				}
+			else // dpotrf
+				{
+				if(j<n-15)
+					{
+					kernel_spotrf_nt_l_16x4_lib8(j+0, &pD[i*sdd], sdd, &pD[0+j*sdd], &pC[(j+0)*bs+(j+0)*sdc], sdc, &pD[(j+0)*bs+(j+0)*sdd], sdd, &dD[j+0]);
+					kernel_spotrf_nt_l_12x4_lib8(j+4, &pD[i*sdd], sdd, &pD[4+j*sdd], &pC[(j+4)*bs+(j+0)*sdc], sdc, &pD[(j+4)*bs+(j+0)*sdd], sdd, &dD[j+4]);
+					kernel_spotrf_nt_l_8x8_lib8((j+8), &pD[(i+8)*sdd], &pD[(j+8)*sdd], &pC[(j+8)*bs+(j+8)*sdc], &pD[(j+8)*bs+(j+8)*sdd], &dD[j+8]);
+					}
+				else
+					{
+					if(j<n-4) // 5 - 15
+						{
+						kernel_spotrf_nt_l_16x4_vs_lib8((j+0), &pD[(i+0)*sdd], sdd, &pD[(j+0)*sdd], &pC[(j+0)*bs+(j+0)*sdc], sdc, &pD[(j+0)*bs+(j+0)*sdd], sdd, &dD[j+0], m-(i+0), n-(j+0));
+						kernel_spotrf_nt_l_12x4_vs_lib8((j+4), &pD[(i+0)*sdd], sdd, &pD[4+(j+0)*sdd], &pC[(j+4)*bs+(j+0)*sdc], sdc, &pD[(j+4)*bs+(j+0)*sdd], sdd, &dD[j+4], m-(i+0), n-(j+4));
+						if(j==n-8) // 8
+							return;
+						if(j<n-12) // 13 - 15
+							{
+							kernel_spotrf_nt_l_8x8_vs_lib8(j+8, &pD[(i+8)*sdd], &pD[(j+8)*sdd], &pC[(j+8)*bs+(j+8)*sdc], &pD[(j+8)*bs+(j+8)*sdd], &dD[j+8], m-(i+8), n-(j+8));
+							}
+						else // 9 10 11 12
+							{
+							kernel_spotrf_nt_l_8x4_vs_lib8(j+8, &pD[(i+8)*sdd], &pD[(j+8)*sdd], &pC[(j+8)*bs+(j+8)*sdc], &pD[(j+8)*bs+(j+8)*sdd], &dD[j+8], m-(i+8), n-(j+8));
+							}
+						}
+					else // 1 2 3 4
+						{
+						kernel_spotrf_nt_l_16x4_vs_lib8(j, &pD[(i+0)*sdd], sdd, &pD[j*sdd], &pC[j*bs+j*sdc], sdc, &pD[j*bs+j*sdd], sdd, &dD[j], m-(i+0), n-j);
+						}
+					}
+				}
+			}
+		}
+	if(m>i)
+		{
+		if(m-i<=8)
+			{
+			goto left_8;
+			}
+		else
+			{
+			goto left_16;
+			}
+		}
+#endif
+
+	// common return if i==m
+	return;
+
+	// clean up loops definitions
+
+#if defined(TARGET_X64_INTEL_HASWELL)
+	left_24:
+	j = 0;
+	for(; j<i & j<n-7; j+=8)
+		{
+		kernel_strsm_nt_rl_inv_24x4_vs_lib8(j+0, &pD[i*sdd], sdd, &pD[0+j*sdd], &pC[(j+0)*bs+i*sdc], sdc, &pD[(j+0)*bs+i*sdd], sdd, &pD[0+(j+0)*bs+(j+0)*sdd], &dD[j+0], m-i, n-(j+0));
+		kernel_strsm_nt_rl_inv_24x4_vs_lib8(j+4, &pD[i*sdd], sdd, &pD[4+j*sdd], &pC[(j+4)*bs+i*sdc], sdc, &pD[(j+4)*bs+i*sdd], sdd, &pD[4+(j+4)*bs+(j+0)*sdd], &dD[j+4], m-i, n-(j+4));
+		}
+	if(j<n)
+		{
+		if(j<i) // dtrsm
+			{
+			kernel_strsm_nt_rl_inv_24x4_vs_lib8(j+0, &pD[i*sdd], sdd, &pD[0+j*sdd], &pC[(j+0)*bs+i*sdc], sdc, &pD[(j+0)*bs+i*sdd], sdd, &pD[(j+0)*bs+(j+0)*sdd], &dD[j+0], m-i, n-(j+0));
+			if(j<n-4) // 5 6 7
+				{
+				kernel_strsm_nt_rl_inv_24x4_vs_lib8(j+4, &pD[i*sdd], sdd, &pD[4+j*sdd], &pC[(j+4)*bs+i*sdc], sdc, &pD[(j+4)*bs+i*sdd], sdd, &pD[4+(j+4)*bs+(j+0)*sdd], &dD[j+4], m-i, n-(j+4));
+				}
+			}
+		else // dpotrf
+			{
+			if(j<n-4) // 5 - 23
+				{
+				kernel_spotrf_nt_l_24x4_vs_lib8((j+0), &pD[(i+0)*sdd], sdd, &pD[(j+0)*sdd], &pC[(j+0)*bs+(j+0)*sdc], sdc, &pD[(j+0)*bs+(j+0)*sdd], sdd, &dD[j+0], m-(i+0), n-(j+0));
+				kernel_spotrf_nt_l_20x4_vs_lib8((j+4), &pD[(i+0)*sdd], sdd, &pD[4+(j+0)*sdd], &pC[(j+4)*bs+(j+0)*sdc], sdc, &pD[(j+4)*bs+(j+0)*sdd], sdd, &dD[j+4], m-(i+0), n-(j+4));
+				if(j>=n-8)
+					return;
+				if(j<n-12) // 13 - 23
+					{
+					kernel_spotrf_nt_l_16x4_vs_lib8((j+8), &pD[(i+8)*sdd], sdd, &pD[(j+8)*sdd], &pC[(j+8)*bs+(j+8)*sdc], sdc, &pD[(j+8)*bs+(j+8)*sdd], sdd, &dD[j+8], m-(i+8), n-(j+8));
+					kernel_spotrf_nt_l_12x4_vs_lib8((j+12), &pD[(i+8)*sdd], sdd, &pD[4+(j+8)*sdd], &pC[(j+12)*bs+(j+8)*sdc], sdc, &pD[(j+12)*bs+(j+8)*sdd], sdd, &dD[j+12], m-(i+8), n-(j+12));
+					if(j>=n-16)
+						return;
+					if(j<n-20) // 21 - 23
+						{
+						kernel_spotrf_nt_l_8x8_vs_lib8(j+16, &pD[(i+16)*sdd], &pD[(j+16)*sdd], &pC[(j+16)*bs+(j+16)*sdc], &pD[(j+16)*bs+(j+16)*sdd], &dD[j+16], m-(i+16), n-(j+16));
+						}
+					else // 17 18 19 20
+						{
+						kernel_spotrf_nt_l_8x4_vs_lib8(j+16, &pD[(i+16)*sdd], &pD[(j+16)*sdd], &pC[(j+16)*bs+(j+16)*sdc], &pD[(j+16)*bs+(j+16)*sdd], &dD[j+16], m-(i+16), n-(j+16));
+						}
+					}
+				else // 9 10 11 12
+					{
+					kernel_spotrf_nt_l_16x4_vs_lib8(j+8, &pD[(i+8)*sdd], sdd, &pD[(j+8)*sdd], &pC[(j+8)*bs+(j+8)*sdc], sdc, &pD[(j+8)*bs+(j+8)*sdd], sdd, &dD[j+8], m-(i+8), n-(j+8));
+					}
+				}
+			else // 1 2 3 4
+				{
+				kernel_spotrf_nt_l_24x4_vs_lib8(j, &pD[(i+0)*sdd], sdd, &pD[j*sdd], &pC[j*bs+j*sdc], sdc, &pD[j*bs+j*sdd], sdd, &dD[j], m-(i+0), n-j);
+				}
+			}
+		}
+	return;
+#endif
+
+	left_16:
+	j = 0;
+	for(; j<i & j<n-7; j+=8)
+		{
+		kernel_strsm_nt_rl_inv_16x4_vs_lib8(j+0, &pD[i*sdd], sdd, &pD[0+j*sdd], &pC[(j+0)*bs+i*sdc], sdc, &pD[(j+0)*bs+i*sdd], sdd, &pD[0+(j+0)*bs+(j+0)*sdd], &dD[j+0], m-i, n-(j+0));
+		kernel_strsm_nt_rl_inv_16x4_vs_lib8(j+4, &pD[i*sdd], sdd, &pD[4+j*sdd], &pC[(j+4)*bs+i*sdc], sdc, &pD[(j+4)*bs+i*sdd], sdd, &pD[4+(j+4)*bs+(j+0)*sdd], &dD[j+4], m-i, n-(j+4));
+		}
+	if(j<n)
+		{
+		if(j<i) // dtrsm
+			{
+			kernel_strsm_nt_rl_inv_16x4_vs_lib8(j+0, &pD[i*sdd], sdd, &pD[0+j*sdd], &pC[(j+0)*bs+i*sdc], sdc, &pD[(j+0)*bs+i*sdd], sdd, &pD[(j+0)*bs+(j+0)*sdd], &dD[j+0], m-i, n-(j+0));
+			if(j<n-4) // 5 6 7
+				{
+				kernel_strsm_nt_rl_inv_16x4_vs_lib8(j+4, &pD[i*sdd], sdd, &pD[4+j*sdd], &pC[(j+4)*bs+i*sdc], sdc, &pD[(j+4)*bs+i*sdd], sdd, &pD[4+(j+4)*bs+(j+0)*sdd], &dD[j+4], m-i, n-(j+4));
+				}
+			}
+		else // dpotrf
+			{
+			if(j<n-4) // 5 - 15
+				{
+				kernel_spotrf_nt_l_16x4_vs_lib8(j+0, &pD[(i+0)*sdd], sdd, &pD[0+j*sdd], &pC[(j+0)*bs+j*sdc], sdc, &pD[(j+0)*bs+j*sdd], sdd, &dD[j+0], m-(i+0), n-(j+0));
+				kernel_spotrf_nt_l_12x4_vs_lib8(j+4, &pD[(i+0)*sdd], sdd, &pD[4+j*sdd], &pC[(j+4)*bs+j*sdc], sdc, &pD[(j+4)*bs+j*sdd], sdd, &dD[j+4], m-(i+0), n-(j+4));
+				if(j>=n-8)
+					return;
+				if(j<n-12) // 13 - 15
+					{
+					kernel_spotrf_nt_l_8x8_vs_lib8((j+8), &pD[(i+8)*sdd], &pD[(j+8)*sdd], &pC[(j+8)*bs+(j+8)*sdc], &pD[(j+8)*bs+(j+8)*sdd], &dD[j+8], m-(i+8), n-(j+8));
+					}
+				else // 9 - 12
+					{
+					kernel_spotrf_nt_l_8x4_vs_lib8((j+8), &pD[(i+8)*sdd], &pD[(j+8)*sdd], &pC[(j+8)*bs+(j+8)*sdc], &pD[(j+8)*bs+(j+8)*sdd], &dD[j+8], m-(i+8), n-(j+8));
+					}
+				}
+			else // 1 2 3 4
+				{
+				kernel_spotrf_nt_l_16x4_vs_lib8(j, &pD[(i+0)*sdd], sdd, &pD[j*sdd], &pC[j*bs+j*sdc], sdc, &pD[j*bs+j*sdd], sdd, &dD[j], m-(i+0), n-j);
+				}
+			}
+		}
+	return;
+
+	left_8:
+	j = 0;
+	for(; j<i & j<n-7; j+=8)
+		{
+		kernel_strsm_nt_rl_inv_8x8_vs_lib8(j, &pD[i*sdd], &pD[j*sdd], &pC[j*bs+i*sdc], &pD[j*bs+i*sdd], &pD[j*bs+j*sdd], &dD[j], m-i, n-j);
+		}
+	if(j<n)
+		{
+		if(j<i) // dtrsm
+			{
+			if(j<n-4) // 5 6 7
+				{
+				kernel_strsm_nt_rl_inv_8x8_vs_lib8(j, &pD[i*sdd], &pD[j*sdd], &pC[j*bs+i*sdc], &pD[j*bs+i*sdd], &pD[j*bs+j*sdd], &dD[j], m-i, n-j);
+				}
+			else // 1 2 3 4
+				{
+				kernel_strsm_nt_rl_inv_8x4_vs_lib8(j, &pD[i*sdd], &pD[j*sdd], &pC[j*bs+i*sdc], &pD[j*bs+i*sdd], &pD[j*bs+j*sdd], &dD[j], m-i, n-j);
+				}
+			}
+		else // dpotrf
+			{
+			if(j<n-4) // 5 6 7
+				{
+				kernel_spotrf_nt_l_8x8_vs_lib8(j, &pD[i*sdd], &pD[j*sdd], &pC[j*bs+j*sdc], &pD[j*bs+j*sdd], &dD[j], m-i, n-j);
+				}
+			else // 1 2 3 4
+				{
+				kernel_spotrf_nt_l_8x4_vs_lib8(j, &pD[i*sdd], &pD[j*sdd], &pC[j*bs+j*sdc], &pD[j*bs+j*sdd], &dD[j], m-i, n-j);
+				}
+			}
+		}
+
+	return;
+
+	}
+
+
+
+void ssyrk_spotrf_ln_libstr(int m, int n, int k, struct s_strmat *sA, int ai, int aj, struct s_strmat *sB, int bi, int bj, struct s_strmat *sC, int ci, int cj, struct s_strmat *sD, int di, int dj)
+	{
+
+	if(ai!=0 | bi!=0 | ci!=0 | di!=0)
+		{
+		printf("\nssyrk_spotrf_ln_libstr: feature not implemented yet: ai=%d, bi=%d, ci=%d, di=%d\n", ai, bi, ci, di);
+		exit(1);
+		}
+
+	const int bs = 8;
+
+	int i, j;
+
+	int sda = sA->cn;
+	int sdb = sB->cn;
+	int sdc = sC->cn;
+	int sdd = sD->cn;
+	float *pA = sA->pA + aj*bs;
+	float *pB = sB->pA + bj*bs;
+	float *pC = sC->pA + cj*bs;
+	float *pD = sD->pA + dj*bs;
+	float *dD = sD->dA; // XXX what to do if di and dj are not zero
+
+//	ssyrk_spotrf_nt_l_lib(m, n, k, pA, sda, pB, sdb, pC, sdc, pD, sdd, dD);
+
+	if(di==0 && dj==0)
+		sD->use_dA = 1;
+	else
+		sD->use_dA = 0;
+
+	i = 0;
+#if defined(TARGET_X64_INTEL_HASWELL)
+	for(; i<m-23; i+=24)
+		{
+		j = 0;
+		for(; j<i & j<n-7; j+=8)
+			{
+			kernel_sgemm_strsm_nt_rl_inv_24x4_lib8(k, &pA[i*sda], sda, &pB[0+j*sdb], j+0, &pD[i*sdd], sdd, &pD[0+j*sdd], &pC[(j+0)*bs+i*sdc], sdc, &pD[(j+0)*bs+i*sdd], sdd, &pD[0+(j+0)*bs+(j+0)*sdd], &dD[j+0]);
+			kernel_sgemm_strsm_nt_rl_inv_24x4_lib8(k, &pA[i*sda], sda, &pB[4+j*sdb], j+4, &pD[i*sdd], sdd, &pD[4+j*sdd], &pC[(j+4)*bs+i*sdc], sdc, &pD[(j+4)*bs+i*sdd], sdd, &pD[4+(j+4)*bs+(j+0)*sdd], &dD[j+4]);
+			}
+		if(j<n)
+			{
+			if(i<j) // dtrsm
+				{
+				kernel_sgemm_strsm_nt_rl_inv_24x4_vs_lib8(k, &pA[i*sda], sda, &pB[0+j*sdb], j+0, &pD[i*sdd], sdd, &pD[0+j*sdd], &pC[(j+0)*bs+i*sdc], sdc, &pD[(j+0)*bs+i*sdd], sdd, &pD[(j+0)*bs+(j+0)*sdd], &dD[j+0], m-i, n-(j+0));
+				if(j<n-4) // 5 6 7
+					{
+					kernel_sgemm_strsm_nt_rl_inv_24x4_vs_lib8(k, &pA[i*sda], sda, &pB[4+j*sdb], j+4, &pD[i*sdd], sdd, &pD[4+j*sdd], &pC[(j+4)*bs+i*sdc], sdc, &pD[(j+4)*bs+i*sdd], sdd, &pD[(j+4)*bs+(j+4)*sdd], &dD[j+4], m-i, n-(j+4));
+					}
+				}
+			else // dpotrf
+				{
+				if(j<n-23)
+					{
+					kernel_ssyrk_spotrf_nt_l_24x4_lib8(k, &pA[(i+0)*sda], sda, &pB[(j+0)*sdb], (j+0), &pD[(i+0)*sdd], sdd, &pD[(j+0)*sdd], &pC[(j+0)*bs+(j+0)*sdc], sdc, &pD[(j+0)*bs+(j+0)*sdd], sdd, &dD[j+0]);
+					kernel_ssyrk_spotrf_nt_l_20x4_lib8(k, &pA[(i+0)*sda], sda, &pB[4+(j+0)*sdb], (j+4), &pD[(i+0)*sdd], sdd, &pD[4+(j+0)*sdd], &pC[(j+4)*bs+(j+0)*sdc], sdc, &pD[(j+4)*bs+(j+0)*sdd], sdd, &dD[j+4]);
+					kernel_ssyrk_spotrf_nt_l_16x4_lib8(k, &pA[(i+8)*sda], sda, &pB[(j+8)*sdb], (j+8), &pD[(i+8)*sdd], sdd, &pD[(j+8)*sdd], &pC[(j+8)*bs+(j+8)*sdc], sdc, &pD[(j+8)*bs+(j+8)*sdd], sdd, &dD[j+8]);
+					kernel_ssyrk_spotrf_nt_l_12x4_lib8(k, &pA[(i+8)*sda], sda, &pB[4+(j+8)*sdb], (j+12), &pD[(i+8)*sdd], sdd, &pD[4+(j+8)*sdd], &pC[(j+12)*bs+(j+8)*sdc], sdc, &pD[(j+12)*bs+(j+8)*sdd], sdd, &dD[j+12]);
+					kernel_ssyrk_spotrf_nt_l_8x8_lib8(k, &pA[(i+16)*sda], &pB[(j+16)*sdb], (j+16), &pD[(i+16)*sdd], &pD[(j+16)*sdd], &pC[(j+16)*bs+(j+16)*sdc], &pD[(j+16)*bs+(j+16)*sdd], &dD[j+16]);
+					}
+				else
+					{
+					if(j<n-4) // 5 - 23
+						{
+						kernel_ssyrk_spotrf_nt_l_24x4_vs_lib8(k, &pA[(i+0)*sda], sda, &pB[(j+0)*sdb], (j+0), &pD[(i+0)*sdd], sdd, &pD[(j+0)*sdd], &pC[(j+0)*bs+(j+0)*sdc], sdc, &pD[(j+0)*bs+(j+0)*sdd], sdd, &dD[j+0], m-(i+0), n-(j+0));
+						kernel_ssyrk_spotrf_nt_l_20x4_vs_lib8(k, &pA[(i+0)*sda], sda, &pB[4+(j+0)*sdb], (j+4), &pD[(i+0)*sdd], sdd, &pD[4+(j+0)*sdd], &pC[(j+4)*bs+(j+0)*sdc], sdc, &pD[(j+4)*bs+(j+0)*sdd], sdd, &dD[j+4], m-(i+0), n-(j+4));
+						if(j==n-8)
+							return;
+						if(j<n-12) // 13 - 23
+							{
+							kernel_ssyrk_spotrf_nt_l_16x4_vs_lib8(k, &pA[(i+8)*sda], sda, &pB[(j+8)*sdb], (j+8), &pD[(i+8)*sdd], sdd, &pD[(j+8)*sdd], &pC[(j+8)*bs+(j+8)*sdc], sdc, &pD[(j+8)*bs+(j+8)*sdd], sdd, &dD[j+8], m-(i+8), n-(j+8));
+							kernel_ssyrk_spotrf_nt_l_12x4_vs_lib8(k, &pA[(i+8)*sda], sda, &pB[4+(j+8)*sdb], (j+12), &pD[(i+8)*sdd], sdd, &pD[4+(j+8)*sdd], &pC[(j+12)*bs+(j+8)*sdc], sdc, &pD[(j+12)*bs+(j+8)*sdd], sdd, &dD[j+12], m-(i+8), n-(j+12));
+							if(j==n-16)
+								return;
+							if(j<n-20) // 21 - 23
+								{
+								kernel_ssyrk_spotrf_nt_l_8x8_vs_lib8(k, &pA[(i+16)*sda], &pB[(j+16)*sdb], j+16, &pD[(i+16)*sdd], &pD[(j+16)*sdd], &pC[(j+16)*bs+(j+16)*sdc], &pD[(j+16)*bs+(j+16)*sdd], &dD[j+16], m-(i+16), n-(j+16));
+								}
+							else // 17 18 19 20
+								{
+								kernel_ssyrk_spotrf_nt_l_8x4_vs_lib8(k, &pA[(i+16)*sda], &pB[(j+16)*sdb], j+16, &pD[(i+16)*sdd], &pD[(j+16)*sdd], &pC[(j+16)*bs+(j+16)*sdc], &pD[(j+16)*bs+(j+16)*sdd], &dD[j+16], m-(i+16), n-(j+16));
+								}
+							}
+						else // 9 10 11 12
+							{
+							kernel_ssyrk_spotrf_nt_l_16x4_vs_lib8(k, &pA[(i+8)*sda], sda, &pB[(j+8)*sdb], j+8, &pD[(i+8)*sdd], sdd, &pD[(j+8)*sdd], &pC[(j+8)*bs+(j+8)*sdc], sdc, &pD[(j+8)*bs+(j+8)*sdd], sdd, &dD[j+8], m-(i+8), n-(j+8));
+							}
+						}
+					else // 1 2 3 4
+						{
+						kernel_ssyrk_spotrf_nt_l_24x4_vs_lib8(k, &pA[(i+0)*sda], sda, &pB[j*sdb], j, &pD[(i+0)*sdd], sdd, &pD[j*sdd], &pC[j*bs+j*sdc], sdc, &pD[j*bs+j*sdd], sdd, &dD[j], m-(i+0), n-j);
+						}
+					}
+				}
+			}
+		}
+	if(m>i)
+		{
+		if(m-i<=8)
+			{
+			goto left_8;
+			}
+		else if(m-i<=16)
+			{
+			goto left_16;
+			}
+		else
+			{
+			goto left_24;
+			}
+		}
+#else
+	for(; i<m-15; i+=16)
+		{
+		j = 0;
+		for(; j<i & j<n-7; j+=8)
+			{
+			kernel_sgemm_strsm_nt_rl_inv_16x4_lib8(k, &pA[i*sda], sda, &pB[0+j*sdb], j+0, &pD[i*sdd], sdd, &pD[0+j*sdd], &pC[(j+0)*bs+i*sdc], sdc, &pD[(j+0)*bs+i*sdd], sdd, &pD[0+(j+0)*bs+(j+0)*sdd], &dD[j+0]);
+			kernel_sgemm_strsm_nt_rl_inv_16x4_lib8(k, &pA[i*sda], sda, &pB[4+j*sdb], j+4, &pD[i*sdd], sdd, &pD[4+j*sdd], &pC[(j+4)*bs+i*sdc], sdc, &pD[(j+4)*bs+i*sdd], sdd, &pD[4+(j+4)*bs+(j+0)*sdd], &dD[j+4]);
+			}
+		if(j<n)
+			{
+			if(i<j) // dtrsm
+				{
+				kernel_sgemm_strsm_nt_rl_inv_16x4_vs_lib8(k, &pA[i*sda], sda, &pB[0+j*sdb], j+0, &pD[i*sdd], sdd, &pD[0+j*sdd], &pC[(j+0)*bs+i*sdc], sdc, &pD[(j+0)*bs+i*sdd], sdd, &pD[(j+0)*bs+(j+0)*sdd], &dD[j+0], m-i, n-(j+0));
+				if(j<n-4) // 5 6 7
+					{
+					kernel_sgemm_strsm_nt_rl_inv_16x4_vs_lib8(k, &pA[i*sda], sda, &pB[4+j*sdb], j+4, &pD[i*sdd], sdd, &pD[4+j*sdd], &pC[(j+4)*bs+i*sdc], sdc, &pD[(j+4)*bs+i*sdd], sdd, &pD[(j+4)*bs+(j+4)*sdd], &dD[j+4], m-i, n-(j+4));
+					}
+				}
+			else // dpotrf
+				{
+				if(j<n-15)
+					{
+					kernel_ssyrk_spotrf_nt_l_16x4_lib8(k, &pA[i*sda], sda, &pB[0+j*sdb], j+0, &pD[i*sdd], sdd, &pD[0+j*sdd], &pC[(j+0)*bs+(j+0)*sdc], sdc, &pD[(j+0)*bs+(j+0)*sdd], sdd, &dD[j+0]);
+					kernel_ssyrk_spotrf_nt_l_12x4_lib8(k, &pA[i*sda], sda, &pB[4+j*sdb], j+4, &pD[i*sdd], sdd, &pD[4+j*sdd], &pC[(j+4)*bs+(j+0)*sdc], sdc, &pD[(j+4)*bs+(j+0)*sdd], sdd, &dD[j+4]);
+					kernel_ssyrk_spotrf_nt_l_8x8_lib8(k, &pA[(i+8)*sda], &pB[(j+8)*sdb], (j+8), &pD[(i+8)*sdd], &pD[(j+8)*sdd], &pC[(j+8)*bs+(j+8)*sdc], &pD[(j+8)*bs+(j+8)*sdd], &dD[j+8]);
+					}
+				else
+					{
+					if(j<n-4) // 5 - 15
+						{
+						kernel_ssyrk_spotrf_nt_l_16x4_vs_lib8(k, &pA[(i+0)*sda], sda, &pB[(j+0)*sdb], (j+0), &pD[(i+0)*sdd], sdd, &pD[(j+0)*sdd], &pC[(j+0)*bs+(j+0)*sdc], sdc, &pD[(j+0)*bs+(j+0)*sdd], sdd, &dD[j+0], m-(i+0), n-(j+0));
+						kernel_ssyrk_spotrf_nt_l_12x4_vs_lib8(k, &pA[(i+0)*sda], sda, &pB[4+(j+0)*sdb], j+4, &pD[(i+0)*sdd], sdd, &pD[4+(j+0)*sdd], &pC[(j+4)*bs+(j+0)*sdc], sdc, &pD[(j+4)*bs+(j+0)*sdd], sdd, &dD[j+4], m-(i+0), n-(j+4));
+						if(j==n-8) // 8
+							return;
+						if(j<n-12) // 13 - 15
+							{
+							kernel_ssyrk_spotrf_nt_l_8x8_vs_lib8(k, &pA[(i+8)*sda], &pB[(j+8)*sdb], j+8, &pD[(i+8)*sdd], &pD[(j+8)*sdd], &pC[(j+8)*bs+(j+8)*sdc], &pD[(j+8)*bs+(j+8)*sdd], &dD[j+8], m-(i+8), n-(j+8));
+							}
+						else // 9 10 11 12
+							{
+							kernel_ssyrk_spotrf_nt_l_8x4_vs_lib8(k, &pA[(i+8)*sda], &pB[(j+8)*sdb], j+8, &pD[(i+8)*sdd], &pD[(j+8)*sdd], &pC[(j+8)*bs+(j+8)*sdc], &pD[(j+8)*bs+(j+8)*sdd], &dD[j+8], m-(i+8), n-(j+8));
+							}
+						}
+					else // 1 2 3 4
+						{
+						kernel_ssyrk_spotrf_nt_l_16x4_vs_lib8(k, &pA[(i+0)*sda], sda, &pB[j*sdb], j, &pD[(i+0)*sdd], sdd, &pD[j*sdd], &pC[j*bs+j*sdc], sdc, &pD[j*bs+j*sdd], sdd, &dD[j], m-(i+0), n-j);
+						}
+					}
+				}
+			}
+		}
+	if(m>i)
+		{
+		if(m-i<=8)
+			{
+			goto left_8;
+			}
+		else
+			{
+			goto left_16;
+			}
+		}
+#endif
+
+	// common return if i==m
+	return;
+
+	// clean up loops definitions
+
+#if defined(TARGET_X64_INTEL_HASWELL)
+	left_24:
+	j = 0;
+	for(; j<i & j<n-7; j+=8)
+		{
+		kernel_sgemm_strsm_nt_rl_inv_24x4_vs_lib8(k, &pA[i*sda], sda, &pB[0+j*sdb], j+0, &pD[i*sdd], sdd, &pD[0+j*sdd], &pC[(j+0)*bs+i*sdc], sdc, &pD[(j+0)*bs+i*sdd], sdd, &pD[0+(j+0)*bs+(j+0)*sdd], &dD[j+0], m-i, n-(j+0));
+		kernel_sgemm_strsm_nt_rl_inv_24x4_vs_lib8(k, &pA[i*sda], sda, &pB[4+j*sdb], j+4, &pD[i*sdd], sdd, &pD[4+j*sdd], &pC[(j+4)*bs+i*sdc], sdc, &pD[(j+4)*bs+i*sdd], sdd, &pD[4+(j+4)*bs+(j+0)*sdd], &dD[j+4], m-i, n-(j+4));
+		}
+	if(j<n)
+		{
+		if(j<i) // dtrsm
+			{
+			kernel_sgemm_strsm_nt_rl_inv_24x4_vs_lib8(k, &pA[i*sda], sda, &pB[0+j*sdb], j+0, &pD[i*sdd], sdd, &pD[0+j*sdd], &pC[(j+0)*bs+i*sdc], sdc, &pD[(j+0)*bs+i*sdd], sdd, &pD[(j+0)*bs+(j+0)*sdd], &dD[j+0], m-i, n-(j+0));
+			if(j<n-4) // 5 6 7
+				{
+				kernel_sgemm_strsm_nt_rl_inv_24x4_vs_lib8(k, &pA[i*sda], sda, &pB[4+j*sdb], j+4, &pD[i*sdd], sdd, &pD[4+j*sdd], &pC[(j+4)*bs+i*sdc], sdc, &pD[(j+4)*bs+i*sdd], sdd, &pD[4+(j+4)*bs+(j+0)*sdd], &dD[j+4], m-i, n-(j+4));
+				}
+			}
+		else // dpotrf
+			{
+			if(j<n-4) // 5 - 23
+				{
+				kernel_ssyrk_spotrf_nt_l_24x4_vs_lib8(k, &pA[(i+0)*sda], sda, &pB[(j+0)*sdb], (j+0), &pD[(i+0)*sdd], sdd, &pD[(j+0)*sdd], &pC[(j+0)*bs+(j+0)*sdc], sdc, &pD[(j+0)*bs+(j+0)*sdd], sdd, &dD[j+0], m-(i+0), n-(j+0));
+				kernel_ssyrk_spotrf_nt_l_20x4_vs_lib8(k, &pA[(i+0)*sda], sda, &pB[4+(j+0)*sdb], (j+4), &pD[(i+0)*sdd], sdd, &pD[4+(j+0)*sdd], &pC[(j+4)*bs+(j+0)*sdc], sdc, &pD[(j+4)*bs+(j+0)*sdd], sdd, &dD[j+4], m-(i+0), n-(j+4));
+				if(j>=n-8)
+					return;
+				if(j<n-12) // 13 - 23
+					{
+					kernel_ssyrk_spotrf_nt_l_16x4_vs_lib8(k, &pA[(i+8)*sda], sda, &pB[(j+8)*sdb], (j+8), &pD[(i+8)*sdd], sdd, &pD[(j+8)*sdd], &pC[(j+8)*bs+(j+8)*sdc], sdc, &pD[(j+8)*bs+(j+8)*sdd], sdd, &dD[j+8], m-(i+8), n-(j+8));
+					kernel_ssyrk_spotrf_nt_l_12x4_vs_lib8(k, &pA[(i+8)*sda], sda, &pB[4+(j+8)*sdb], j+12, &pD[(i+8)*sdd], sdd, &pD[4+(j+8)*sdd], &pC[(j+12)*bs+(j+8)*sdc], sdc, &pD[(j+12)*bs+(j+8)*sdd], sdd, &dD[j+12], m-(i+8), n-(j+12));
+					if(j>=n-16)
+						return;
+					if(j<n-20) // 21 - 23
+						{
+						kernel_ssyrk_spotrf_nt_l_8x8_vs_lib8(k, &pA[(i+16)*sda], &pB[(j+16)*sdb], j+16, &pD[(i+16)*sdd], &pD[(j+16)*sdd], &pC[(j+16)*bs+(j+16)*sdc], &pD[(j+16)*bs+(j+16)*sdd], &dD[j+16], m-(i+16), n-(j+16));
+						}
+					else // 17 18 19 20
+						{
+						kernel_ssyrk_spotrf_nt_l_8x4_vs_lib8(k, &pA[(i+16)*sda], &pB[(j+16)*sdb], j+16, &pD[(i+16)*sdd], &pD[(j+16)*sdd], &pC[(j+16)*bs+(j+16)*sdc], &pD[(j+16)*bs+(j+16)*sdd], &dD[j+16], m-(i+16), n-(j+16));
+						}
+					}
+				else // 9 10 11 12
+					{
+					kernel_ssyrk_spotrf_nt_l_16x4_vs_lib8(k, &pA[(i+8)*sda], sda, &pB[(j+8)*sdb], j+8, &pD[(i+8)*sdd], sdd, &pD[(j+8)*sdd], &pC[(j+8)*bs+(j+8)*sdc], sdc, &pD[(j+8)*bs+(j+8)*sdd], sdd, &dD[j+8], m-(i+8), n-(j+8));
+					}
+				}
+			else // 1 2 3 4
+				{
+				kernel_ssyrk_spotrf_nt_l_24x4_vs_lib8(k, &pA[(i+0)*sda], sda, &pB[j*sdb], j, &pD[(i+0)*sdd], sdd, &pD[j*sdd], &pC[j*bs+j*sdc], sdc, &pD[j*bs+j*sdd], sdd, &dD[j], m-(i+0), n-j);
+				}
+			}
+		}
+	return;
+#endif
+
+	left_16:
+	j = 0;
+	for(; j<i & j<n-7; j+=8)
+		{
+		kernel_sgemm_strsm_nt_rl_inv_16x4_vs_lib8(k, &pA[i*sda], sda, &pB[0+j*sdb], j+0, &pD[i*sdd], sdd, &pD[0+j*sdd], &pC[(j+0)*bs+i*sdc], sdc, &pD[(j+0)*bs+i*sdd], sdd, &pD[0+(j+0)*bs+(j+0)*sdd], &dD[j+0], m-i, n-(j+0));
+		kernel_sgemm_strsm_nt_rl_inv_16x4_vs_lib8(k, &pA[i*sda], sda, &pB[4+j*sdb], j+4, &pD[i*sdd], sdd, &pD[4+j*sdd], &pC[(j+4)*bs+i*sdc], sdc, &pD[(j+4)*bs+i*sdd], sdd, &pD[4+(j+4)*bs+(j+0)*sdd], &dD[j+4], m-i, n-(j+4));
+		}
+	if(j<n)
+		{
+		if(j<i) // dtrsm
+			{
+			kernel_sgemm_strsm_nt_rl_inv_16x4_vs_lib8(k, &pA[i*sda], sda, &pB[0+j*sdb], j+0, &pD[i*sdd], sdd, &pD[0+j*sdd], &pC[(j+0)*bs+i*sdc], sdc, &pD[(j+0)*bs+i*sdd], sdd, &pD[(j+0)*bs+(j+0)*sdd], &dD[j+0], m-i, n-(j+0));
+			if(j<n-4) // 5 6 7
+				{
+				kernel_sgemm_strsm_nt_rl_inv_16x4_vs_lib8(k, &pA[i*sda], sda, &pB[4+j*sdb], j+4, &pD[i*sdd], sdd, &pD[4+j*sdd], &pC[(j+4)*bs+i*sdc], sdc, &pD[(j+4)*bs+i*sdd], sdd, &pD[4+(j+4)*bs+(j+0)*sdd], &dD[j+4], m-i, n-(j+4));
+				}
+			}
+		else // dpotrf
+			{
+			if(j<n-4) // 5 - 15
+				{
+				kernel_ssyrk_spotrf_nt_l_16x4_vs_lib8(k, &pA[(i+0)*sda], sda, &pB[0+j*sdb], j+0, &pD[(i+0)*sdd], sdd, &pD[0+j*sdd], &pC[(j+0)*bs+j*sdc], sdc, &pD[(j+0)*bs+j*sdd], sdd, &dD[j+0], m-(i+0), n-(j+0));
+				kernel_ssyrk_spotrf_nt_l_12x4_vs_lib8(k, &pA[(i+0)*sda], sda, &pB[4+j*sdb], j+4, &pD[(i+0)*sdd], sdd, &pD[4+j*sdd], &pC[(j+4)*bs+j*sdc], sdc, &pD[(j+4)*bs+j*sdd], sdd, &dD[j+4], m-(i+0), n-(j+4));
+				if(j>=n-8)
+					return;
+				if(j<n-12) // 13 - 15
+					{
+					kernel_ssyrk_spotrf_nt_l_8x8_vs_lib8(k, &pA[(i+8)*sda], &pB[(j+8)*sdb], (j+8), &pD[(i+8)*sdd], &pD[(j+8)*sdd], &pC[(j+8)*bs+(j+8)*sdc], &pD[(j+8)*bs+(j+8)*sdd], &dD[j+8], m-(i+8), n-(j+8));
+					}
+				else // 9 - 12
+					{
+					kernel_ssyrk_spotrf_nt_l_8x4_vs_lib8(k, &pA[(i+8)*sda], &pB[(j+8)*sdb], j+8, &pD[(i+8)*sdd], &pD[(j+8)*sdd], &pC[(j+8)*bs+(j+8)*sdc], &pD[(j+8)*bs+(j+8)*sdd], &dD[j+8], m-(i+8), n-(j+8));
+					}
+				}
+			else // 1 2 3 4
+				{
+				kernel_ssyrk_spotrf_nt_l_16x4_vs_lib8(k, &pA[(i+0)*sda], sda, &pB[j*sdb], j, &pD[(i+0)*sdd], sdd, &pD[j*sdd], &pC[j*bs+j*sdc], sdc, &pD[j*bs+j*sdd], sdd, &dD[j], m-(i+0), n-j);
+				}
+			}
+		}
+	return;
+
+	left_8:
+	j = 0;
+	for(; j<i & j<n-7; j+=8)
+		{
+		kernel_sgemm_strsm_nt_rl_inv_8x8_vs_lib8(k, &pA[i*sda], &pB[j*sdb], j, &pD[i*sdd], &pD[j*sdd], &pC[j*bs+i*sdc], &pD[j*bs+i*sdd], &pD[j*bs+j*sdd], &dD[j], m-i, n-j);
+		}
+	if(j<n)
+		{
+		if(j<i) // dtrsm
+			{
+			if(j<n-4) // 5 6 7
+				{
+				kernel_sgemm_strsm_nt_rl_inv_8x8_vs_lib8(k, &pA[i*sda], &pB[j*sdb], j, &pD[i*sdd], &pD[j*sdd], &pC[j*bs+i*sdc], &pD[j*bs+i*sdd], &pD[j*bs+j*sdd], &dD[j], m-i, n-j);
+				}
+			else // 1 2 3 4
+				{
+				kernel_sgemm_strsm_nt_rl_inv_8x4_vs_lib8(k, &pA[i*sda], &pB[j*sdb], j, &pD[i*sdd], &pD[j*sdd], &pC[j*bs+i*sdc], &pD[j*bs+i*sdd], &pD[j*bs+j*sdd], &dD[j], m-i, n-j);
+				}
+			}
+		else // dpotrf
+			{
+			if(j<n-4) // 5 6 7
+				{
+				kernel_ssyrk_spotrf_nt_l_8x8_vs_lib8(k, &pA[i*sda], &pB[j*sdb], j, &pD[i*sdd], &pD[j*sdd], &pC[j*bs+j*sdc], &pD[j*bs+j*sdd], &dD[j], m-i, n-j);
+				}
+			else // 1 2 3 4
+				{
+				kernel_ssyrk_spotrf_nt_l_8x4_vs_lib8(k, &pA[i*sda], &pB[j*sdb], j, &pD[i*sdd], &pD[j*sdd], &pC[j*bs+j*sdc], &pD[j*bs+j*sdd], &dD[j], m-i, n-j);
+				}
+			}
+		}
+	return;
+
+	}
+
+
+
+int sgeqrf_work_size_libstr(int m, int n)
+	{
+	printf("\nsgeqrf_work_size_libstr: feature not implemented yet\n");
+	exit(1);
+	return 0;
+	}
+
+
+
+void sgeqrf_libstr(int m, int n, struct s_strmat *sC, int ci, int cj, struct s_strmat *sD, int di, int dj, void *work)
+	{
+	if(m<=0 | n<=0)
+		return;
+	printf("\nsgeqrf_libstr: feature not implemented yet\n");
+	exit(1);
+	return;
+	}
+
+
+
+