added new optimized sgemm kernel for SANDYBRIGE

kernel/x86_64/KERNEL.SANDYBRIDGE

@@ -1,18 +1,16 @@
 SGEMVNKERNEL = sgemv_n.S
 SGEMVTKERNEL = sgemv_t.S
 
-
-SGEMMKERNEL    =  gemm_kernel_4x8_nehalem.S
-SGEMMINCOPY    =  gemm_ncopy_4.S
-SGEMMITCOPY    =  gemm_tcopy_4.S
-SGEMMONCOPY    =  ../generic/gemm_ncopy_8.c
-SGEMMOTCOPY    =  ../generic/gemm_tcopy_8.c
+SGEMMKERNEL    =  sgemm_kernel_16x4_sandy.S
+SGEMMINCOPY    =  ../generic/gemm_ncopy_16.c
+SGEMMITCOPY    =  ../generic/gemm_tcopy_16.c
+SGEMMONCOPY    =  ../generic/gemm_ncopy_4.c
+SGEMMOTCOPY    =  ../generic/gemm_tcopy_4.c
 SGEMMINCOPYOBJ =  sgemm_incopy$(TSUFFIX).$(SUFFIX)
 SGEMMITCOPYOBJ =  sgemm_itcopy$(TSUFFIX).$(SUFFIX)
 SGEMMONCOPYOBJ =  sgemm_oncopy$(TSUFFIX).$(SUFFIX)
 SGEMMOTCOPYOBJ =  sgemm_otcopy$(TSUFFIX).$(SUFFIX)
 
-
 DGEMMKERNEL    =  dgemm_kernel_4x8_sandy.S
 DGEMMINCOPY    =  ../generic/gemm_ncopy_8.c
 DGEMMITCOPY    =  ../generic/gemm_tcopy_8.c

param.h

@@ -1108,14 +1108,14 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #define ZGEMM_DEFAULT_UNROLL_N 2
 #define XGEMM_DEFAULT_UNROLL_N 1
 #else
-#define SGEMM_DEFAULT_UNROLL_M 4
+#define SGEMM_DEFAULT_UNROLL_M 16
 #define DGEMM_DEFAULT_UNROLL_M 8
 #define QGEMM_DEFAULT_UNROLL_M 2
 #define CGEMM_DEFAULT_UNROLL_M 2
 #define ZGEMM_DEFAULT_UNROLL_M 4
 #define XGEMM_DEFAULT_UNROLL_M 1
 
-#define SGEMM_DEFAULT_UNROLL_N 8
+#define SGEMM_DEFAULT_UNROLL_N 4
 #define DGEMM_DEFAULT_UNROLL_N 4
 #define QGEMM_DEFAULT_UNROLL_N 2
 #define CGEMM_DEFAULT_UNROLL_N 4
@@ -1123,7 +1123,7 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #define XGEMM_DEFAULT_UNROLL_N 1
 #endif
 
-#define SGEMM_DEFAULT_P 512
+#define SGEMM_DEFAULT_P 768
 #define SGEMM_DEFAULT_R sgemm_r
 //#define SGEMM_DEFAULT_R 1024
 
@@ -1145,7 +1145,7 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #define XGEMM_DEFAULT_P 252
 #define XGEMM_DEFAULT_R xgemm_r
 
-#define SGEMM_DEFAULT_Q 256
+#define SGEMM_DEFAULT_Q 384
 #define DGEMM_DEFAULT_Q 256
 #define QGEMM_DEFAULT_Q 128
 #define CGEMM_DEFAULT_Q 256