OpenBLAS/kernel/x86_64/saxpy_microk_nehalem-2.c

/***************************************************************************
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#define HAVE_KERNEL_16 1
static void saxpy_kernel_16( BLASLONG n, FLOAT *x, FLOAT *y , FLOAT *alpha) __attribute__ ((noinline));

static void saxpy_kernel_16( BLASLONG n, FLOAT *x, FLOAT *y, FLOAT *alpha)
{


	BLASLONG register i = 0;

	__asm__  __volatile__
	(
	"movss			(%4), %%xmm0		    \n\t"  // alpha	
	"shufps          $0,  %%xmm0, %%xmm0                \n\t"

	".p2align 4				            \n\t"
	"1:				            \n\t"
        // "prefetcht0      192(%2,%0,4)                       \n\t"
        // "prefetcht0      192(%3,%0,4)                       \n\t"

        "movups                  (%2,%0,4), %%xmm12         \n\t"  // 4 * x
        "movups                16(%2,%0,4), %%xmm13         \n\t"  // 4 * x
        "movups                32(%2,%0,4), %%xmm14         \n\t"  // 4 * x
        "movups                48(%2,%0,4), %%xmm15         \n\t"  // 4 * x
        "movups                  (%3,%0,4), %%xmm8          \n\t"  // 4 * y
        "movups                16(%3,%0,4), %%xmm9          \n\t"  // 4 * y
        "movups                32(%3,%0,4), %%xmm10         \n\t"  // 4 * y
        "movups                48(%3,%0,4), %%xmm11         \n\t"  // 4 * y

	"mulps          %%xmm0 , %%xmm12 		    \n\t"  // alpha * x
	"mulps          %%xmm0 , %%xmm13 		    \n\t"  
	"mulps          %%xmm0 , %%xmm14 		    \n\t"  
	"mulps          %%xmm0 , %%xmm15 		    \n\t"  

	"addps		%%xmm12, %%xmm8   \n\t" // y += alpha *x
	"addps		%%xmm13, %%xmm9   \n\t"
	"addps		%%xmm14, %%xmm10  \n\t"
	"addps		%%xmm15, %%xmm11  \n\t"

	"movups		%%xmm8 ,   (%3,%0,4)                 \n\t"
	"movups		%%xmm9 , 16(%3,%0,4)                 \n\t"
	"movups		%%xmm10, 32(%3,%0,4)                 \n\t"
	"movups		%%xmm11, 48(%3,%0,4)                 \n\t"

	"addq		$16, %0	  	 	             \n\t"
	"subq	        $16, %1			             \n\t"		
	"jnz		1b		             \n\t"

	:
          "+r" (i),	// 0	
	  "+r" (n)  	// 1
        :
          "r" (x),      // 2
          "r" (y),      // 3
          "r" (alpha)   // 4
	: "cc", 
	  "%xmm0", 
	  "%xmm8", "%xmm9", "%xmm10", "%xmm11", 
	  "%xmm12", "%xmm13", "%xmm14", "%xmm15",
	  "memory"
	);

}