optimized sgemv_n_microk_sandy.c

diff --git a/kernel/x86_64/sgemv_n_microk_sandy.c b/kernel/x86_64/sgemv_n_microk_sandy.c
index 7d9360f..9bdb066 100644 (file)
--- a/kernel/x86_64/sgemv_n_microk_sandy.c
+++ b/kernel/x86_64/sgemv_n_microk_sandy.c
@@ -29,7 +29,7 @@ static void  sgemv_kernel_64( long n, float alpha, float *a, long lda, float *x,
 {
 
 
-       float *pre = a + lda*3;
+       float *pre = a + lda*2;
 
        __asm__  __volatile__
        (
@@ -58,20 +58,19 @@ static void  sgemv_kernel_64( long n, float alpha, float *a, long lda, float *x,
        "leaq     (%%r8 , %%rcx, 4), %%r8        \n\t"  // add lda to pointer for prefetch
 
        "prefetcht0     (%%r8)\n\t"                     // Prefetch
-       "prefetcht0   64(%%r8)\n\t"                     // Prefetch
-       "prefetcht0  128(%%r8)\n\t"                     // Prefetch
-       "prefetcht0  192(%%r8)\n\t"                     // Prefetch
-
        "vmulps   0*4(%%rsi), %%ymm0, %%ymm4 \n\t" // multiply a and c and add to temp
        "vmulps   8*4(%%rsi), %%ymm0, %%ymm5 \n\t" // multiply a and c and add to temp
+       "prefetcht0   64(%%r8)\n\t"                     // Prefetch
        "vmulps  16*4(%%rsi), %%ymm0, %%ymm6 \n\t" // multiply a and c and add to temp
        "vmulps  24*4(%%rsi), %%ymm0, %%ymm7 \n\t" // multiply a and c and add to temp
 
        "vaddps %%ymm8 , %%ymm4, %%ymm8 \n\t" // multiply a and c and add to temp
        "vaddps %%ymm9 , %%ymm5, %%ymm9 \n\t" // multiply a and c and add to temp
+       "prefetcht0  128(%%r8)\n\t"                     // Prefetch
        "vaddps %%ymm10, %%ymm6, %%ymm10\n\t" // multiply a and c and add to temp
        "vaddps %%ymm11, %%ymm7, %%ymm11\n\t" // multiply a and c and add to temp
 
+       "prefetcht0  192(%%r8)\n\t"                     // Prefetch
        "vmulps  32*4(%%rsi), %%ymm0, %%ymm4 \n\t" // multiply a and c and add to temp
        "vmulps  40*4(%%rsi), %%ymm0, %%ymm5 \n\t" // multiply a and c and add to temp
        "vmulps  48*4(%%rsi), %%ymm0, %%ymm6 \n\t" // multiply a and c and add to temp