enabled gemv assembly on power8

kernel/power/KERNEL.POWER8

@@ -137,15 +137,16 @@ ZGEMM3MKERNEL    =  zgemm3m_kernel_4x4_sse3.S
 #CSWAPKERNEL  = ../arm/zswap.c
 #ZSWAPKERNEL  = ../arm/zswap.c
 #
-SGEMVNKERNEL = ../arm/gemv_n.c
-DGEMVNKERNEL = ../arm/gemv_n.c
-CGEMVNKERNEL = ../arm/zgemv_n.c
-ZGEMVNKERNEL = ../arm/zgemv_n.c
-
-SGEMVTKERNEL = ../arm/gemv_t.c
-DGEMVTKERNEL = ../arm/gemv_t.c
-CGEMVTKERNEL = ../arm/zgemv_t.c
-ZGEMVTKERNEL = ../arm/zgemv_t.c
+
+#SGEMVNKERNEL = ../arm/gemv_n.c
+#DGEMVNKERNEL = ../arm/gemv_n.c
+#CGEMVNKERNEL = ../arm/zgemv_n.c
+#ZGEMVNKERNEL = ../arm/zgemv_n.c
+#
+#SGEMVTKERNEL = ../arm/gemv_t.c
+#DGEMVTKERNEL = ../arm/gemv_t.c
+#CGEMVTKERNEL = ../arm/zgemv_t.c
+#ZGEMVTKERNEL = ../arm/zgemv_t.c
 
 SSYMV_U_KERNEL =  ../generic/symv_k.c
 SSYMV_L_KERNEL =  ../generic/symv_k.c

kernel/power/gemv_n.S

@@ -174,6 +174,12 @@
 #define PREFETCHSIZE_C  40
 #endif
 
+#ifdef POWER8
+#define PREFETCHSIZE_A  96
+#define PREFETCHSIZE_C  40
+#endif
+
+
 #ifndef NEEDPARAM
 
 #ifndef __64BIT__

kernel/power/gemv_t.S

@@ -139,6 +139,11 @@
 #define PREFETCHSIZE_C   8
 #endif
 
+#ifdef POWER8
+#define PREFETCHSIZE_A  96
+#define PREFETCHSIZE_C   8
+#endif
+
 #define y01 f0
 #define y02 f1
 #define y03 f2

kernel/power/zgemv_n.S

@@ -170,6 +170,11 @@
 #define PREFETCHSIZE_C  24
 #endif
 
+#ifdef POWER8
+#define PREFETCHSIZE_A  24
+#define PREFETCHSIZE_C  24
+#endif
+
 #ifndef XCONJ
 #define FMADDR FMADD
 #define FMSUBR FNMSUB

kernel/power/zgemv_t.S

@@ -144,6 +144,12 @@
 #define PREFETCHSIZE_C   8
 #endif
 
+#ifdef POWER8
+#define PREFETCHSIZE_A  24
+#define PREFETCHSIZE_C   8
+#endif
+
+
 #if !(defined(CONJ) && defined(XCONJ))
 #define FMADDR FMADD
 #define FMSUBR FNMSUB